{ "openapi": "3.1.0", "info": { "title": "World university web census", "version": "2026-09-30", "summary": "Every university with a primary domain in the public university-domains list (10,265 institutions) was fetched once over HTTPS on 2026-09-30, with robots.txt, security.txt (both locations), llms.txt and the A2A agent card. 6,811 answered with a website. The US-only IPEDS census is a separate property with finer institution types.", "description": "Every university with a primary domain in the public university-domains list (10,265 institutions) was fetched once over HTTPS on 2026-09-30, with robots.txt, security.txt (both locations), llms.txt and the A2A agent card. 6,811 answered with a website. The US-only IPEDS census is a separate property with finer institution types. Free: every record, feed, badge, aggregate and the first 50 rows of every gap list. Paid with x402 (USDC on Base, no account or key): 27 operations; an unpaid request answers 402 with the terms, pay and resend with X-PAYMENT. Prices here equal the amounts in the 402 challenges and in /.well-known/x402.", "termsOfService": "https://universities.agentexchange.work/terms", "contact": { "name": "Agent Exchange", "url": "https://agentexchange.work" }, "license": { "name": "CC BY 4.0", "url": "https://creativecommons.org/licenses/by/4.0/" }, "x-payment": { "protocol": "x402", "versions": [ 1, 2 ], "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "facilitator": "https://facilitator.payai.network" }, "x-guidance": "Read GET https://universities.agentexchange.work/university/.json first: it lists the gap lists the domain is on and every offer with its price. Free samples before paying: /leads/.top.json. Who buys the lists: vendors who sell the missing control." }, "servers": [ { "url": "https://universities.agentexchange.work" } ], "tags": [ { "name": "paid", "description": "x402-paid (USDC on Base)" }, { "name": "free", "description": "no payment" } ], "paths": { "/university/{domain}.json": { "get": { "operationId": "domainRecord", "summary": "Census record of one university domain (CC BY 4.0, CORS): checks, fixes, gap_lists and offers", "tags": [ "free" ], "responses": { "200": { "description": "OK" } }, "parameters": [ { "name": "domain", "in": "path", "required": true, "schema": { "type": "string" }, "description": "registrable domain from the census list, lower-case, no scheme" } ] } }, "/university/{domain}.xml": { "get": { "operationId": "domainFeed", "summary": "Atom feed of one domain: census record plus every change found by the live re-checks", "tags": [ "free" ], "responses": { "200": { "description": "OK" } }, "parameters": [ { "name": "domain", "in": "path", "required": true, "schema": { "type": "string" }, "description": "registrable domain from the census list, lower-case, no scheme" } ] } }, "/university/{domain}.svg": { "get": { "operationId": "domainBadge", "summary": "SVG badge of the record (security.txt, accessibility statement, AI-crawler stance)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } }, "parameters": [ { "name": "domain", "in": "path", "required": true, "schema": { "type": "string" }, "description": "registrable domain from the census list, lower-case, no scheme" } ] } }, "/university/{domain}/live.json": { "get": { "operationId": "liveRecheck", "summary": "Live re-check of one domain right now, diffed against the census record (0.01 USD in USDC)", "description": "Live re-check of one university domain right now: HTTPS, HSTS, security.txt, robots.txt verdicts for AI crawlers and assistants, llms.txt, privacy and accessibility links, diffed against the census record", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.010000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "10000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "domain", "in": "path", "required": true, "schema": { "type": "string" }, "description": "registrable domain from the census list, lower-case, no scheme" } ], "responses": { "200": { "description": "{ domain, checked_at, census_record, live, changed[], payment }", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "domain not in the census" } } } }, "/listings": { "get": { "operationId": "listings", "summary": "Current listings and terms (free; /listings.json for JSON)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } }, "post": { "operationId": "listUrl", "summary": "List one https URL on this host for 30 days (1.00 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "requestBody": { "required": true, "content": { "application/json": { "schema": { "type": "object", "required": [ "url", "name" ], "properties": { "url": { "type": "string", "format": "uri" }, "name": { "type": "string", "maxLength": 80 }, "description": { "type": "string", "maxLength": 300 }, "payTo": { "type": "string" } } } } } }, "responses": { "200": { "description": "listing created: { id, url, name, expires }" }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/all.json": { "get": { "operationId": "leadsBundle", "summary": "All gap lists of this census in one JSON file (5.00 USD in USDC)", "description": "All 8 gap lists of the 2026-09-30 World university web census in one JSON file (21,702 rows across lists): no-accessibility-link (5,285), no-privacy-link (4,831), no-security-txt (6,485), expired-security-txt (61), no-hsts (4,029), blocks-assistants (93), http-only (470), redirects-off-domain (448). Each list as { title, count, by_state, columns, rows[][] }. Free samples first: https://universities.agentexchange.work/leads/.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "5.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "5000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON { census, date, lists: { : { title, count, by_state, columns, rows } } }", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads": { "get": { "operationId": "gapLists", "summary": "Index of the 8 gap lists (who is missing which control)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-accessibility-link.top.json": { "get": { "operationId": "leads_no_accessibility_link_top", "summary": "Universities without an accessibility statement on the homepage: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-accessibility-link.xml": { "get": { "operationId": "leads_no_accessibility_link_feed", "summary": "Universities without an accessibility statement on the homepage: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-accessibility-link.csv": { "get": { "operationId": "leads_no_accessibility_link_csv", "summary": "Universities without an accessibility statement on the homepage: the full list as CSV, 5,285 rows (1.00 USD in USDC)", "description": "Universities without an accessibility statement on the homepage: 5,285 universities (51.5% of the 10,265 in the 2026-09-30 census) whose record lacks Accessibility statement linked from the homepage. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-accessibility-link.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-accessibility-link.json": { "get": { "operationId": "leads_no_accessibility_link_json", "summary": "Universities without an accessibility statement on the homepage: the full list as JSON, 5,285 rows (1.00 USD in USDC)", "description": "Universities without an accessibility statement on the homepage: 5,285 universities (51.5% of the 10,265 in the 2026-09-30 census) whose record lacks Accessibility statement linked from the homepage. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-accessibility-link.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-accessibility-link/state/{code}.csv": { "get": { "operationId": "leads_no_accessibility_link_state", "summary": "Universities without an accessibility statement on the homepage: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/no-privacy-link.top.json": { "get": { "operationId": "leads_no_privacy_link_top", "summary": "Universities without a privacy policy link on the homepage: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-privacy-link.xml": { "get": { "operationId": "leads_no_privacy_link_feed", "summary": "Universities without a privacy policy link on the homepage: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-privacy-link.csv": { "get": { "operationId": "leads_no_privacy_link_csv", "summary": "Universities without a privacy policy link on the homepage: the full list as CSV, 4,831 rows (1.00 USD in USDC)", "description": "Universities without a privacy policy link on the homepage: 4,831 universities (47.1% of the 10,265 in the 2026-09-30 census) whose record lacks Privacy policy linked from the homepage. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-privacy-link.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-privacy-link.json": { "get": { "operationId": "leads_no_privacy_link_json", "summary": "Universities without a privacy policy link on the homepage: the full list as JSON, 4,831 rows (1.00 USD in USDC)", "description": "Universities without a privacy policy link on the homepage: 4,831 universities (47.1% of the 10,265 in the 2026-09-30 census) whose record lacks Privacy policy linked from the homepage. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-privacy-link.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-privacy-link/state/{code}.csv": { "get": { "operationId": "leads_no_privacy_link_state", "summary": "Universities without a privacy policy link on the homepage: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/no-security-txt.top.json": { "get": { "operationId": "leads_no_security_txt_top", "summary": "Universities without a security.txt: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-security-txt.xml": { "get": { "operationId": "leads_no_security_txt_feed", "summary": "Universities without a security.txt: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-security-txt.csv": { "get": { "operationId": "leads_no_security_txt_csv", "summary": "Universities without a security.txt: the full list as CSV, 6,485 rows (1.00 USD in USDC)", "description": "Universities without a security.txt: 6,485 universities (63.2% of the 10,265 in the 2026-09-30 census) whose record lacks security.txt (RFC 9116). Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-security-txt.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-security-txt.json": { "get": { "operationId": "leads_no_security_txt_json", "summary": "Universities without a security.txt: the full list as JSON, 6,485 rows (1.00 USD in USDC)", "description": "Universities without a security.txt: 6,485 universities (63.2% of the 10,265 in the 2026-09-30 census) whose record lacks security.txt (RFC 9116). Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-security-txt.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-security-txt/state/{code}.csv": { "get": { "operationId": "leads_no_security_txt_state", "summary": "Universities without a security.txt: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/expired-security-txt.top.json": { "get": { "operationId": "leads_expired_security_txt_top", "summary": "Universities with an expired security.txt: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/expired-security-txt.xml": { "get": { "operationId": "leads_expired_security_txt_feed", "summary": "Universities with an expired security.txt: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/expired-security-txt.csv": { "get": { "operationId": "leads_expired_security_txt_csv", "summary": "Universities with an expired security.txt: the full list as CSV, 61 rows (1.00 USD in USDC)", "description": "Universities with an expired security.txt: 61 universities (0.6% of the 10,265 in the 2026-09-30 census) whose record lacks security.txt Expires line (RFC 9116). Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/expired-security-txt.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/expired-security-txt.json": { "get": { "operationId": "leads_expired_security_txt_json", "summary": "Universities with an expired security.txt: the full list as JSON, 61 rows (1.00 USD in USDC)", "description": "Universities with an expired security.txt: 61 universities (0.6% of the 10,265 in the 2026-09-30 census) whose record lacks security.txt Expires line (RFC 9116). Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/expired-security-txt.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/expired-security-txt/state/{code}.csv": { "get": { "operationId": "leads_expired_security_txt_state", "summary": "Universities with an expired security.txt: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/no-hsts.top.json": { "get": { "operationId": "leads_no_hsts_top", "summary": "Universities without HSTS: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-hsts.xml": { "get": { "operationId": "leads_no_hsts_feed", "summary": "Universities without HSTS: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/no-hsts.csv": { "get": { "operationId": "leads_no_hsts_csv", "summary": "Universities without HSTS: the full list as CSV, 4,029 rows (1.00 USD in USDC)", "description": "Universities without HSTS: 4,029 universities (39.2% of the 10,265 in the 2026-09-30 census) whose record lacks HTTP Strict Transport Security header. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-hsts.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-hsts.json": { "get": { "operationId": "leads_no_hsts_json", "summary": "Universities without HSTS: the full list as JSON, 4,029 rows (1.00 USD in USDC)", "description": "Universities without HSTS: 4,029 universities (39.2% of the 10,265 in the 2026-09-30 census) whose record lacks HTTP Strict Transport Security header. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/no-hsts.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/no-hsts/state/{code}.csv": { "get": { "operationId": "leads_no_hsts_state", "summary": "Universities without HSTS: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/blocks-assistants.top.json": { "get": { "operationId": "leads_blocks_assistants_top", "summary": "Universities blocking both ChatGPT-User and Claude-User: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/blocks-assistants.xml": { "get": { "operationId": "leads_blocks_assistants_feed", "summary": "Universities blocking both ChatGPT-User and Claude-User: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/blocks-assistants.csv": { "get": { "operationId": "leads_blocks_assistants_csv", "summary": "Universities blocking both ChatGPT-User and Claude-User: the full list as CSV, 93 rows (1.00 USD in USDC)", "description": "Universities blocking both ChatGPT-User and Claude-User: 93 universities (0.9% of the 10,265 in the 2026-09-30 census) whose record lacks robots.txt verdicts for ChatGPT-User and Claude-User. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/blocks-assistants.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/blocks-assistants.json": { "get": { "operationId": "leads_blocks_assistants_json", "summary": "Universities blocking both ChatGPT-User and Claude-User: the full list as JSON, 93 rows (1.00 USD in USDC)", "description": "Universities blocking both ChatGPT-User and Claude-User: 93 universities (0.9% of the 10,265 in the 2026-09-30 census) whose record lacks robots.txt verdicts for ChatGPT-User and Claude-User. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/blocks-assistants.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/blocks-assistants/state/{code}.csv": { "get": { "operationId": "leads_blocks_assistants_state", "summary": "Universities blocking both ChatGPT-User and Claude-User: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/http-only.top.json": { "get": { "operationId": "leads_http_only_top", "summary": "Universities answering only over plain HTTP: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/http-only.xml": { "get": { "operationId": "leads_http_only_feed", "summary": "Universities answering only over plain HTTP: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/http-only.csv": { "get": { "operationId": "leads_http_only_csv", "summary": "Universities answering only over plain HTTP: the full list as CSV, 470 rows (1.00 USD in USDC)", "description": "Universities answering only over plain HTTP: 470 universities (4.6% of the 10,265 in the 2026-09-30 census) whose record lacks HTTPS. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/http-only.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/http-only.json": { "get": { "operationId": "leads_http_only_json", "summary": "Universities answering only over plain HTTP: the full list as JSON, 470 rows (1.00 USD in USDC)", "description": "Universities answering only over plain HTTP: 470 universities (4.6% of the 10,265 in the 2026-09-30 census) whose record lacks HTTPS. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/http-only.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/http-only/state/{code}.csv": { "get": { "operationId": "leads_http_only_state", "summary": "Universities answering only over plain HTTP: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/leads/redirects-off-domain.top.json": { "get": { "operationId": "leads_redirects_off_domain_top", "summary": "University homepages that redirect to another domain: first 50 rows and counts by country (free, CORS)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/redirects-off-domain.xml": { "get": { "operationId": "leads_redirects_off_domain_feed", "summary": "University homepages that redirect to another domain: Atom feed of universities entering or leaving the list", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/leads/redirects-off-domain.csv": { "get": { "operationId": "leads_redirects_off_domain_csv", "summary": "University homepages that redirect to another domain: the full list as CSV, 448 rows (1.00 USD in USDC)", "description": "University homepages that redirect to another domain: 448 universities (4.4% of the 10,265 in the 2026-09-30 census) whose record lacks Homepage served on the listed domain. Full list as CSV, header row, every cell quoted. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/redirects-off-domain.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/redirects-off-domain.json": { "get": { "operationId": "leads_redirects_off_domain_json", "summary": "University homepages that redirect to another domain: the full list as JSON, 448 rows (1.00 USD in USDC)", "description": "University homepages that redirect to another domain: 448 universities (4.4% of the 10,265 in the 2026-09-30 census) whose record lacks Homepage served on the listed domain. Full list as JSON { list, title, count, by_state, columns, rows[][] }. Columns: domain, name, type, city, state, known_domains, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title. CC BY 4.0 data, filtered; the first 50 rows are free at https://universities.agentexchange.work/leads/redirects-off-domain.top.json.", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "1.000000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "1000000", "facilitator": "https://facilitator.payai.network" } } ] }, "responses": { "200": { "description": "JSON", "content": { "application/json": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } } } } }, "/leads/redirects-off-domain/state/{code}.csv": { "get": { "operationId": "leads_redirects_off_domain_state", "summary": "University homepages that redirect to another domain: one country as CSV (0.25 USD in USDC)", "tags": [ "paid" ], "x-payment-info": { "price": { "mode": "fixed", "currency": "USD", "amount": "0.250000" }, "protocols": [ { "x402": { "version": 1, "scheme": "exact", "network": "eip155:8453", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "payTo": "0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c", "amount_atomic": "250000", "facilitator": "https://facilitator.payai.network" } } ] }, "parameters": [ { "name": "code", "in": "path", "required": true, "schema": { "type": "string" }, "description": "two-letter country code from by_state in the free .top.json" } ], "responses": { "200": { "description": "CSV", "content": { "text/csv": {} } }, "402": { "description": "Payment required: x402 requirements in the JSON body (v1) and in the PAYMENT-REQUIRED header (v2). Sign an EIP-3009 USDC authorization for the amount to payTo and resend the same request with X-PAYMENT; the response carries PAYMENT-RESPONSE.", "content": { "application/json": { "schema": { "type": "object", "properties": { "x402Version": { "type": "integer" }, "error": { "type": "string" }, "accepts": { "type": "array", "items": { "type": "object" } } } } } } }, "404": { "description": "unknown code" } } } }, "/findings.json": { "get": { "operationId": "findings", "summary": "All aggregates of the census", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/live.json": { "get": { "operationId": "liveTotals", "summary": "Re-check totals (last run, domains re-checked, changes)", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/trending.json": { "get": { "operationId": "trending", "summary": "The 100 most fetched pages of the last 7 days by crawler family", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/changes.xml": { "get": { "operationId": "changesFeed", "summary": "Atom feed of the last 100 changes found by the 6-hourly re-checks", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/.well-known/x402": { "get": { "operationId": "manifest", "summary": "x402 manifest: every paid route with the exact terms of its 402", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } }, "/.well-known/agent-card.json": { "get": { "operationId": "agentCard", "summary": "A2A agent card", "tags": [ "free" ], "responses": { "200": { "description": "OK" } } } } } }