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ForgeMesh x402 Endpoint Preflight & Health Check
x402
ForgeMesh x402 Endpoint Preflight & Health Check is a paid API for AI agents from x402.forgemesh.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Checks whether a given URL is a valid, reachable x402-payment-gated endpoint and returns its payment envelope details, grade, and dual-stack compatibility findings.
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, response time in ms, whether a valid x402 envelope was found (in header or body), whether MPP dual-stack is supported, a list of human-readable findings, the raw x402 envelope, accepted payment assets and amounts, and any envelope errors detected.
Example use cases
Audit newly deployed x402 API
“I just deployed my API at https://api.myservice.com/premium-data — can you check if its x402 payment configuration is valid and tell me what grade it gets and whether the envelope is well-formed?”
Debug a broken x402 payment wall
“My x402 endpoint at https://x402.myapp.io/inference isn't working right — can you probe it and tell me what errors are in the envelope and whether it's actually reachable?”
Check MPP dual-stack compatibility
“Does https://library.forgemesh.io/business-management support both x402 and MPP dual-stack payments? Run a preflight and tell me exactly which payment schemes and assets it accepts.”
Technical details
Endpoint
POSThttps://x402.forgemesh.io/x402-endpoint-preflightWhen to prefer
Use this endpoint when you need to programmatically verify that a specific URL is correctly configured as an x402 payment endpoint — especially before integrating it into an agent workflow, listing it in a directory, or debugging why payments are failing. It is the canonical preflight/health-check tool for the x402 ecosystem, returning structured grading and envelope details that generic HTTP probes cannot provide.
Side effects
- URL is not reachable — reachable: false with no envelope data
- URL does not return a 402 status — is_402: false and low grade
- Malformed x402 envelope — envelope_valid: false with envelope_errors populated
- URL is reachable but has no x402 or payment headers at all — grade may be F
- Network timeout or DNS failure on the target URL
- Invalid URL format provided in the request body
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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