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Proofwire HTTP URL Verification
x402
Proofwire HTTP URL Verification is a paid API for AI agents from verify.reversecaptcha.fun, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Checks whether a URL is alive and returns a signed verdict with redirect chain, TLS status, latency, and body hash
Price / call$0.001
Success—
StatusUnknown
How this service works
Close the loop on your own work with one paid call that returns a verdict plus Ed25519-signed, falsifiable evidence (verify signatures with GET /v1/keys). GET /v1/verify/http checks a URL is alive (redirect chain, TLS, latency, body hash). GET /v1/verify/dns resolves records and parses SPF/DMARC/DKIM. Email: POST /v1/verify/email/inbox issues a seed address; send mail to it, then GET /v1/verify/email?inbox=&token= returns delivery plus SPF/DKIM/DMARC alignment and raw headers (polls inside the paid window are free). Webhooks: POST /v1/verify/webhook arms a tripwire URL; register it upstream, then poll GET /v1/verify/webhook/{id}?token= for free. GET /v1/verify/page renders a page in a real browser, asserts a selector/text, and returns a screenshot URL. Failed work is never settled.
Output
A JSON object containing a verdict ('pass' or 'fail'), a human-readable reason string, evidence object (TLS validity, final URL, final HTTP status, redirect chain array, optional body hash), and an Ed25519 signature object for cryptographic verification of the result.
Example use cases
Confirm deployment URL is live
“After deploying my new app, can you check that https://myapp.example.com returns a 200 and that TLS is valid — and give me a signed receipt I can attach to the deployment log?”
Audit unexpected redirect chain
“I'm getting weird redirects from https://oldsite.com — can you trace the full redirect chain to see where it actually ends up, and verify whether TLS is valid at the final destination?”
Prove a URL was reachable for a contract
“I need tamper-proof evidence that https://client-deliverable.com/report.pdf was publicly accessible today — can you verify it's live and get me a signed proof with the body hash?”
Technical details
Endpoint
GEThttps://verify.reversecaptcha.fun/v1/verify/http?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need cryptographically signed, falsifiable proof that a URL was alive at a specific moment — not just a simple ping. It is the right choice when an AI agent needs to close the loop on its own work (e.g., confirming a deployed resource is reachable), when the redirect chain matters, when TLS health must be confirmed, or when a downstream party needs an auditable receipt. Prefer it over generic uptime checkers when non-repudiation or agent self-verification is required.
Side effects
- URL is unreachable or times out — verdict 'fail' with reason describing the network error
- TLS certificate invalid or expired — evidence shows tls.valid false
- Unexpected HTTP status code when expect_status is set — verdict 'fail' with status mismatch reason
- Malformed or non-URI input URL — likely 400 bad request
- Payment not included or insufficient — 402 Payment Required response before verification occurs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"reason": "status 200",
"verdict": "pass",
"evidence": {
"tls": {
"valid": true
},
"final_url": "https://example.com/",
"final_status": 200,
"redirect_chain": []
},
"signature": {
"alg": "Ed25519"
}
}
}Tags
x402
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