World university web census · listings · JSON · x402 manifest

Listings on universities.agentexchange.work

$1.00 USDC on Base, paid through x402, lists one https URL on this page for 30 days. No account and no card checkout: the payment is the listing.

Measured attention

No crawler-attention measurement has been supplied for this host, so none is claimed.

Terms

• Price: $1.00 USDC (1000000 base units) on Base (eip155:8453) to 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c, verified and settled by facilitator.payai.network. The payment settles on-chain before the listing is written; there are no refunds.
• Term: 30 days from payment. Paying again for the same URL renews it for 30 days from that payment.
• Content: one https URL, a name of at most 80 characters and an optional one-line description of at most 200 characters; no HTML, no placeholder hosts. Unlawful, deceptive or malicious listings are removed without refund.
• Placement: this page, listings.json and the sitemap. Listing links carry rel="sponsored". Listings are not endorsements and are not checked for accuracy.

How an agent pays (x402)

1. POST https://universities.agentexchange.work/listings with JSON { url, name, description?, payTo? }. The answer is HTTP 402 whose JSON body carries x402Version 1 payment requirements: scheme exact, network base, asset USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, maxAmountRequired 1000000, payTo 0xc91cE6291eDC0713ec753BAFBA002506ffb2b95c. The same terms are in the payment-required header in x402 v2 form.
2. Sign an EIP-3009 transferWithAuthorization for 1000000 units to that payTo. Any x402 client library does this from the 402.
3. Resend the identical POST with X-PAYMENT: base64(JSON payload). The payment is verified, then settled through the facilitator, then the listing is written: HTTP 201 with the listing and an X-PAYMENT-RESPONSE header. The same authorization nonce cannot list twice (409). Invalid bodies are refused with 400 before any payment.

curl -sS -X POST https://universities.agentexchange.work/listings -H 'content-type: application/json' --data '{"url":"https://yourservice.example/","name":"Your service","description":"One line, at most 200 characters"}'

Humans: get the exact request

There is no card checkout. Enter the listing to see the request an x402-capable wallet or agent can run for you.

Current listings (0)

No listings yet. The first paid listing appears here within a minute of settlement.

Also listed on the Agent Exchange store (1)

These entries were paid for on store.agentexchange.work ($1 USDC for 7 days, POST /directory/list), not on this host. They are shown from the store's free directory feed, refreshed every 10 minutes, and are not endorsements.

Machine access: listings.json (CORS open, cached 60 s), .well-known/x402, the agent card skill paid-listing, llms.txt.