x402 Doctor

Free: does this x402 endpoint work for a paying agent? Returns pass, warn or fail with the number of problems and the top three. Limited to 10 calls per hour. For every check use x402_diagnose ($0.01); for code changes x402_fix ($0.05); before paying someone else's endpoint x402_preflight ($0.001).

Free: after paying an x402 endpoint, pass the PAYMENT-RESPONSE header it returned (X-PAYMENT-RESPONSE in v1). Returns the transaction, network and payer it names, whether that transaction exists on-chain and succeeded, and which USDC moved from whom to whom, with an explorer link. Read-only. Limited to 10 calls per hour.

Free: check the signed receipt that every paid x402 Doctor answer carries (diagnose, preflight, batch, deep, fix, delivery check; HTTP or MCP), for example to prove later which verdict you got before paying an endpoint. Pass the whole answer as response. Returns valid, the signer and whether it is an x402 Doctor signer; with route and input also whether the receipt is for exactly that request. A c

Paid ($0.01 USDC via x402 on Base or Solana): diagnose an x402 endpoint the way a paying agent would, without paying it: the 402 challenge format, every accepts[] option, the resource URL, Solana settlement readiness, which wallets can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with pass/warn/fail and a fix hint. For the endpoint's owner or a developer debugging it;

Paid ($0.001 USDC via x402 on Base or Solana): call this before your agent pays an x402 endpoint. Returns go, caution or no_go, the recommended payment option, and why: payment would fail, the seller's payout address is on the OFAC SDN sanctions list, over your budget (max_usd), price above what is advertised, not HTTPS, unknown token, its 30-day track record. Never pays the endpoint. The buyer's

Paid ($0.05 USDC via x402 on Base or Solana): diagnoses your x402 endpoint, then returns per problem the concrete change as code for your stack (express, next, hono, node, python, generic), filled in with your own payTo, amount, network and route. For the endpoint's owner: includes the diagnosis, so there is no need to call x402_diagnose first. Same as GET /api/v1/fix. The answer carries a signed

Paid ($0.005 USDC via x402 on Base or Solana): the pre-payment check for up to 10 x402 endpoints at once. Per endpoint go, caution or no_go, the recommended payment option and why, plus totals. For marketplaces and agents that weigh several services. Never pays the endpoints. Same as GET /api/v1/preflight/batch. The answer carries a signed receipt (EIP-191, bound to your arguments) that proves lat

Paid ($0.01 USDC via x402 on Base or Solana): for expensive calls. The pre-payment verdict (go, caution or no_go) plus the full diagnosis, the 30-day history per day, how reliable the seller's other endpoints are and whether the endpoint moved domains. Never pays the endpoint. Worth it before a payment above about $1; for an ordinary call x402_preflight is enough. Same as GET /api/v1/preflight/dee

Paid ($0.25 USDC via x402 on Base or Solana): not a reading but a purchase. x402 Doctor buys the endpoint once (at most $0.1, USDC on Base, from its own wallet) with the example input its listing declares, checks the answer against the declared output schema and measures the charge on chain. Answers with a job id at once; follow it with x402_delivery_status (free), the result usually comes within

Free: the status of a delivery check ordered with x402_delivery_check (or GET /api/v1/delivery-check): awaiting_payment, queued or done, and once done the result: paid_and_delivered, the outcome, the charge measured on chain and the transaction.

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