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x402 Paywall Health Checker — ForgeMesh
x402
x402 Paywall Health Checker — ForgeMesh 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).
Checks whether a given URL is a valid, reachable x402 payment-gated endpoint and reports its payment envelope, HTTP status, accepted assets, and dual-stack compatibility.
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
A JSON object with a letter grade (e.g. 'A'), reachability boolean, HTTP status code, x402 envelope location and validity, MPP dual-stack flag, list of accepted payment assets (asset address, payTo address, amount, scheme, network), response time in milliseconds, array of human-readable findings, and any envelope errors found.
Example use cases
Debug misconfigured x402 paywall
“I just deployed my API at https://myapi.example.com/premium-data and I think the x402 paywall isn't set up right — can you probe it and tell me what the envelope looks like and whether it passes validation?”
Audit third-party x402 endpoint before integration
“Before I integrate with https://data.thirdparty.io/market-feed in my agent, can you check if it's a properly reachable x402 endpoint, what grade it gets, and whether it accepts USDC on Base?”
Check dual-stack MPP compatibility
“Can you inspect https://api.someservice.io/payments to see if it supports both x402 and MPP dual-stack, and let me know its reachability and response time?”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/x402-paywall-checkWhen to prefer
Use this endpoint when you need to programmatically verify that an x402-gated URL is correctly configured, reachable, and compliant before integrating it into an agent workflow or marketplace listing. It is the right choice when you want a graded, structured audit of x402 envelope structure, dual-stack MPP support, and accepted payment assets — rather than simply making a payment attempt.
Side effects
- URL is unreachable — reachable: false, http_status may be null or a non-402 code
- No x402 envelope found — grade degraded, envelope_valid: false, findings list explains absence
- Malformed x402 envelope — envelope_errors array populated with specific issues
- URL is not a 402 endpoint at all — is_402: false, grade low
- Network timeout — response_time_ms may be high or request may fail entirely
- Invalid URL format in input — likely 4xx error from this API itself
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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