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known-answer x402 fixture
A small seller-side test surface for x402 verification probes. Built to be paid by agents, inspected by harnesses, and ignored by normal humans.
networkbase-sepolia
facilitatorx402.org
assetUSDC
modefixture
Disclosure
This site is a test fixture for 402verify.io. The API endpoints on this domain implement x402 payment-and-entitlement patterns for research. Some endpoints deliberately misbehave at the protocol level to test verification probes. Payloads are honestly labeled dummy data. Nothing here is a real data product.
Endpoints
| Route | Price | Paid | Behavior |
|---|---|---|---|
/api/free |
$0.000001 | 4 | floor-priced x402 handshake |
/api/pay-per-request |
$0.001 | 3 | canonical pay-per-request fixture |
/api/daily |
$0.002 | 3 | pay once, reuse free for 24h (signed-nonce auth) |
/api/lifetime |
$0.005 | 3 | pay once, reuse free forever (signed-nonce auth) |
/api/fixtures/well-behaved |
$0.001 | 3 | control — well-behaved paid route |
/api/fixtures/stale |
$0.001 | 3 | frozen timestamp (stale payload) |
/api/fixtures/drift |
$0.005 | 3 | charges $0.005, but its payload claims $0.001 — verify on-chain |
/api/fixtures/garbage |
$0.001 | 3 | pays, returns semantically empty data |
/api/fixtures/flaky |
$0.001 | 1 | intermittent 503 before the handshake |
/api/fixtures/dead |
— | — | always dead (HTTP 521) |
Paid counts on-chain-settled deliveries since launch. Free reuse of a daily/lifetime entitlement settles nothing, so it isn't counted — those totals are purchases, not requests.