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10x402 x402 Envelope Linter
x402
10x402 x402 Envelope Linter is a paid API for AI agents from 10x402.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-15).
Lints a raw HTTP 402 response envelope for x402 compliance issues that prevent indexing or discovery in Bazaar, and provides a fix for each finding.
Price / call$0.04
Success—
StatusUnknown
How this service works
Check a captured x402 402 for indexing and payment blockers — no fetch
Output
Returns a JSON lint report containing a letter grade (e.g. 'A'), a summary with detected versions, payTo address, network, price, bazaar_ready status, and a list of blockers; plus a findings array where each finding has a severity, error code, human-readable message, and a detailed fix recommendation; and a total checks_run count.
Example use cases
Debugging Bazaar indexing failure
“My x402 endpoint passes validate but it's not appearing in Bazaar at all — can you run this 402 response through the envelope linter and tell me every blocker and how to fix it? The response is: {"status":402,"headers":{},"body":"{\"version\":1,...}"}”
Checking v1 vs v2 header compliance
“I think my 402 response might be missing the PAYMENT-REQUIRED header required for v2 indexing. Can you lint this envelope and tell me if I need to add it, and what exactly to put there? Response: {"status":402,"headers":{"x-payment":"..."},"body":"..."}”
Pre-launch x402 compliance audit
“Before I list my new x402 service publicly, can you check this 402 response envelope for any compliance issues that would stop it from being discovered or paid by strict v2 clients? Give me a grade and all the fixes: {"status":402,"headers":{"payment-required":"..."},"body":"..."}”
Technical details
Endpoint
POSThttps://10x402.com/lint/envelopeWhen to prefer
Use this endpoint specifically when an x402 service passes basic validation but fails to appear in Bazaar or is not indexed by discovery infrastructure. It is purpose-built for diagnosing response-level x402 envelope issues (v1 vs v2, missing headers, malformed envelopes) rather than general HTTP debugging or payment execution. Prefer this over generic HTTP linters when the issue involves x402 protocol compliance, CDP indexing requirements, or Bazaar discoverability.
Side effects
- Input body exceeds 256 KB limit — request rejected
- Malformed JSON in the 402 response body field — parse error returned
- Missing required fields (type, method, bodyType, body) — validation error
- Non-HTTP type or non-POST method submitted — schema constraint violation
- Service unavailable — HTTP 5xx with no lint report
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "text",
"format": "application/json",
"example": "{\"grade\":\"A\",\"summary\":{\"versions_detected\":[1],\"payTo\":\"0x0000000000000000000000000000000000000001\",\"network\":\"base\",\"price\":\"$0.001 (1000 atomic)\",\"bazaar_ready\":\"n/a\",\"blockers\":[\"V2_HEADER_PRESENT\"]},\"findings\":[{\"severity\":\"error\",\"code\":\"V2_HEADER_PRESENT\",\"message\":\"no PAYMENT-REQUIRED response header — this endpoint publishes no x402 v2 envelope.\",\"fix\":\"Add a PAYMENT-REQUIRED response header to the 402 carrying the standard-base64 JSON v2 envelope. This costs you DISCOVERY rather than payment, and the distinction is worth being precise about: @x402/core reads the header first but DOES fall back to a v1 body when there is none, so the current client generation can still pay you. What it cannot do is find you — CDP marks the PAYMENT-REQUIRED header a required indexing check, so a v1-only 402 is not catalogued at all, and a strictly-v2 client cannot pay it either. Keep the v1 body exactly as it is; the two versions share a 402 without either noticing the other.\",\"core\":false}],\"checks_run\":28}"
}Tags
x402
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