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x402 Doctor – Diagnose x402 Payment Endpoint
x402
x402 Doctor – Diagnose x402 Payment Endpoint is a paid API for AI agents from x402-doctor.fizzl.eu, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Diagnoses and debugs an x402 payment endpoint by running a suite of read-only checks across the 402 challenge, accepts configuration, resource URL, Solana settlement readiness, wallet/agent compatibility, and discovery/browser paywall setup, returning each check with a status and fix hint.
Price / call$0.01
Success—
StatusUnknown
How this service works
Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays.
Output
Returns an overall pass/warn/fail status, a list of individual checks (each with an id, group, status, message, and optional fix hint), the detected HTTP method, the parsed 402 challenge object, and a per-wallet breakdown showing which networks allow payment and which fail with reasons.
Example use cases
Debugging a failing AI agent payment
“My AI agent keeps failing to pay my x402 endpoint at https://api.myapp.com/data — can you run a full diagnosis on it using GET and tell me exactly what's misconfigured and how to fix it?”
Pre-launch x402 integration checklist
“Before I launch, can you check my new x402 paywall at https://tools.mysite.com/api/report to make sure the challenge, Solana settlement, wallet compatibility, and Bazaar discovery are all set up correctly?”
Identifying which wallets can pay
“I want to know which crypto wallets and AI agents can successfully pay my x402 endpoint at https://x402.myservice.io/generate — please run the diagnosis and list the ones that work and the ones that fail with reasons.”
Technical details
Endpoint
GEThttps://x402-doctor.fizzl.eu/api/v1/diagnose?utm_source=zero.xyzWhen to prefer
Use this endpoint when an x402-protected API or MCP server is behaving unexpectedly — payments failing, agents unable to transact, or the paywall not rendering in browsers. It is the go-to read-only diagnostic tool covering every layer of the x402 stack (challenge format, accepts[] config, settlement, wallet compatibility, and discovery) in a single call, without ever executing a real payment.
Side effects
- Target URL is not publicly reachable (network timeout or DNS failure)
- Endpoint does not return a 402 response at all (not an x402 endpoint)
- Malformed or missing 402 challenge header prevents check execution
- Solana RPC unavailable causing settlement checks to be skipped
- Invalid URL format provided as input
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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