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ForgeMesh x402 Payment Envelope Validator
x402
ForgeMesh x402 Payment Envelope Validator is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Validates and health-checks an x402 payment envelope at a given URL, confirming it is reachable, returns a proper 402 challenge, and reporting envelope quality, dual-stack support, and accepted payment details.
Price / call$0.05
Success—
StatusUnknown
How this service works
x402 utility APIs for AI agents: documents/OCR, PDFs, vision, audio, embeddings, web extraction, dictionary and slang lookups, games, chess/legal-move logic, math, conversions, time utilities, market and economic data, space/geo data, domain vetting, content-signal checks, and x402 ecosystem intelligence. Agents POST JSON, receive a 402 challenge, pay USDC on Base, and retry for the result.
Output
Returns a JSON object with a letter grade (e.g. A), reachability flag, HTTP status code, whether a valid x402 v2 envelope was found, whether the endpoint speaks MPP dual-stack, a summary of accepted payment assets (token address, payTo address, amount, scheme, network), any envelope errors, and response time in milliseconds.
Example use cases
Pre-launch x402 endpoint audit
“Before I go live, can you validate the x402 payment envelope at https://x402.myservice.io/premium-data and tell me if it's correctly configured, what grade it earns, and whether there are any envelope errors I need to fix?”
Debugging a broken payment wall
“My x402 endpoint at https://api.myapp.com/gated-route isn't working — can you probe it, tell me if it's reachable, what HTTP status it returns, and whether the 402 envelope is valid or malformed?”
Checking dual-stack MPP support
“Can you check https://x402.partnerapi.com/endpoint and confirm whether it supports both x402 and MPP dual-stack, and what USDC address and asset it accepts for payment?”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/validate-payment-envelopeWhen to prefer
Use this endpoint when you need to programmatically verify that a specific x402 endpoint is correctly configured, reachable, and serving a valid payment envelope — especially before integrating it into an agent workflow, auditing a fleet of x402 services, or debugging a non-functional payment wall. It is the right choice when you want structured diagnostic output (grade, errors, dual-stack flag, accepted assets) rather than just a raw HTTP probe.
Side effects
- URL is unreachable — reachable: false with no HTTP status
- URL does not return a 402 — is_402: false, grade may be F
- Envelope is present but malformed — envelope_valid: false with errors listed in envelope_errors
- Invalid or missing URL input — likely a 400 error or validation failure
- Network timeout on the probed endpoint — may return error or low grade
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | x402 endpoint URL to health-check, e.g. https://x402.example.com/some-route |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://library.forgemesh.io/business-management",
"grade": "A",
"is_402": true,
"findings": [
"Valid x402 v2 envelope found in the header.",
"WWW-Authenticate: Payment header also present — this endpoint speaks both x402 and MPP dual-stack, reaching agents on either payment stack."
],
"reachable": true,
"http_status": 402,
"method_used": "GET",
"x402_envelope": "header",
"envelope_valid": true,
"mpp_dual_stack": true,
"accepts_summary": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x85df5380DEbe236AD6BF49dE788243924B080267",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"envelope_errors": [],
"response_time_ms": 214
}
}Tags
x402
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