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x402 Validator — x402 Endpoint Conformance Auditor
x402
x402 Validator — x402 Endpoint Conformance Auditor is a paid API for AI agents from x402-validator-tools.fly.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-12).
Audits a target URL for strict x402 protocol conformance, live 402 payment-gate behavior, and operator-actionable compliance evidence before an agent spends funds.
Price / call$0.02
Success—
StatusUnknown
How this service works
Verify x402 endpoints with strict-v2 conformance, live 402 behavior, and operator-actionable evidence before agents spend. Built by Gael Leonardo Chulim Gongora (mss_ali / Ali Nain).
Output
Returns a structured audit report containing an overall pass/fail/warn status, a human-readable summary, an array of named per-check results (each with status, message, and optional details), latency in milliseconds, a timestamp, and optionally an AI-generated remediation advice string and/or plain-language explanation of the findings.
Example use cases
Pre-integration compliance check
“I'm about to have my agent start paying the endpoint at https://shop.example.com/premium — can you validate it for x402 conformance in standard mode first and tell me if it's safe to proceed?”
Debugging a broken 402 endpoint
“My x402 endpoint at https://myapi.fly.dev/pay keeps getting rejected by agents — can you audit it and include AI remediation advice so I know exactly what to fix?”
Marketplace seller vetting
“I'm onboarding a new merchant to my x402 marketplace — can you run a marketplace-mode validation on https://vendor.example.com/api and give me a plain-language summary of the results for my non-technical review team?”
Technical details
Endpoint
POSThttps://x402-validator-tools.fly.dev/validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or developer needs to verify that a specific x402 payment-gated URL is correctly implemented before committing funds or integrating it into a workflow. It is the right choice when you need strict-v2 protocol conformance evidence, per-check diagnostics, and optionally AI-generated fix guidance — rather than just a simple HTTP reachability probe or a generic API health check.
Side effects
- Target URL is unreachable or times out — check result will show connection failure
- Target does not return a 402 status at all — fails live 402 behavior check
- Missing or malformed x402 payment headers — specific checks flagged with details
- advise or explain fields require INCEPTION_API_KEY to be configured server-side — omitting key returns null for those fields
- Invalid or non-HTTP URL provided — request rejected with validation error
- Marketplace mode applied to a non-marketplace endpoint — may produce irrelevant check results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | Target merchant URL to audit (http or https) |
| mode | string | standard | marketplace |
| advise | boolean | Attach Inception AI remediation advice (requires INCEPTION_API_KEY server-side) |
| explain | boolean | Attach a plain-language AI summary of the result for non-experts (requires INCEPTION_API_KEY server-side) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| urlrequired | string | |
| checksrequired | array | |
| overallrequired | string | |
| summaryrequired | string | |
| ai_advice | — | |
| timestamprequired | string | |
| ai_summary | — | |
| latency_ms | — |
Tags
x402
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