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10x402 x402 Envelope Linter (Single Check)
x402
10x402 x402 Envelope Linter (Single Check) is a paid API for AI agents from 10x402.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Lints a single x402 HTTP 402 response envelope for a specific compliance check and returns a finding with a concrete fix.
Price / call$0.004
Success—
StatusUnknown
How this service works
Run ONE named check against a response you paste
Output
A JSON report for one check ID containing: whether the check applied and passed, a finding object with severity, error code, human-readable message, and a detailed actionable fix, the x402 regime and whether the check is core, source references (spec, CDP validator, client code, field reports), and a summary of the 402 envelope (detected versions, payTo address, network, price).
Example use cases
Diagnosing missing Bazaar indexing
“My API keeps passing validation but never appears in Bazaar search — run the V2_B64_URLSAFE check on this 402 response I'm getting and tell me what the blocker is and how to fix it.”
Fixing x402 v2 envelope header
“I'm getting reports that strict x402 v2 clients can't pay my endpoint even though v1 clients can — can you lint my 402 response with the V2_HEADER_PRESENT check and give me the exact fix?”
Pre-launch x402 compliance audit
“Before I ship this new paid API endpoint, run a single-check lint on its 402 response using check ID V2_B64_URLSAFE so I can see if the envelope will pass x402 Bazaar indexing requirements.”
Technical details
Endpoint
POSThttps://10x402.com/lint/envelope/oneWhen to prefer
Use this endpoint when you need a focused, single-check lint of an x402 402 HTTP response — especially when a service passes general validation but fails to appear in Bazaar or is not discoverable by x402 v2 clients. It provides a specific finding and a concrete fix for one check at a time, making it ideal for targeted debugging rather than full-suite validation. Prefer it over generic HTTP validators when you need x402-protocol-specific compliance context and actionable remediation guidance.
Side effects
- Malformed body JSON returns a parse error
- Missing required fields (type, method, bodyType, body) returns 400
- Body exceeds 256 KB limit returns payload too large
- Invalid or unrecognized check ID returns applied:false with no finding
- 402 response body missing status or headers may result in partial analysis
- Network timeout if upstream envelope fetch is slow
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "text",
"format": "application/json",
"example": "{\"check\":\"V2_HEADER_PRESENT\",\"applied\":true,\"passed\":false,\"finding\":{\"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},\"regime\":\"bazaar\",\"severity\":\"error\",\"core\":false,\"sources\":[{\"kind\":\"spec\",\"ref\":\"specs/transports-v2/http.md:7-25 § Payment Required Signaling\"},{\"kind\":\"cdp-validator\",\"ref\":\"cdp-validator-toolshed.json preflight[6] payment_required_header (required)\"},{\"kind\":\"client-code\",\"ref\":\"@x402/core@2.23.0 dist/cjs/http/index.js:1620-1628 — the v2 client DOES fall back to a v1 body\"},{\"kind\":\"field-report\",\"ref\":\"x402-foundation/x402#3091 — x402-fetch@1.x is still a live buyer population\"}],\"summary\":{\"versions_detected\":[1],\"payTo\":\"0x0000000000000000000000000000000000000001\",\"network\":\"base\",\"price\":\"$0.001 (1000 atomic)\"},\"checks_run\":1}"
}Tags
x402
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