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Holoweave Witness — URL Witness (Batch URL Verification with Signed Attestations)
x402
Holoweave Witness — URL Witness (Batch URL Verification with Signed Attestations) is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.05/call, status down (last checked 2026-09-15).
Fetches and verifies up to 10 URLs, returning signed Ed25519 attestations with HTTP status, body hash, change detection, and optional full-text extraction.
Price / call$0.05
Success—
StatusDown
How this service works
Web bot auth debugging for AI agents, priced per check at $0.01. RFC 7638 keyid thumbprint verification, RFC 9421 Ed25519 signature verification, and per-verifier acceptance rules. Signed attestations, published fixtures, sources with dates.
Output
Returns a JSON object containing a signed Ed25519 attestation (algorithm, base64 signature value, key ID) and an attestation body with a per-URL verdict ('pass'/'fail'), HTTP status code, body SHA-256 hash, optional 'UNCHANGED' finding when an expected hash matches, and aggregate summary counts of pass/fail/unreachable/changed URLs.
Example use cases
Content integrity check before publishing
“Before I publish my report, can you witness https://source-site.org/report-2024 and https://source-site.org/data.csv and give me signed attestations with their body hashes so I have cryptographic proof of what they said at this moment?”
Detect changes in a monitored page
“I previously recorded a body SHA-256 hash for https://regulations.gov/document/XYZ — can you witness that URL again and tell me if the content has changed, using that expected hash to compare?”
Verify multiple partner URLs are live
“Can you check that all three of our partner URLs are reachable right now — https://partnerA.com/status, https://partnerB.io/health, and https://partnerC.net/ping — and return a signed witness report showing HTTP status and body hashes for each?”
Technical details
Endpoint
POSThttps://witness.holoweave.org/v1/urls-witnessWhen to prefer
Choose this endpoint when you need tamper-evident, cryptographically signed proof that a URL was reachable and served specific content at a given time — especially when change detection (via SHA-256 comparison) or independent third-party attestation is required. Prefer over simple HTTP HEAD checks when auditability, non-repudiation, or content integrity proof matters. Also useful for batch verification of up to 10 URLs in a single signed response.
Side effects
- URL unreachable or DNS failure — marked as 'unreachable' in summary
- HTTP non-200 status code — recorded with actual status, verdict may be 'fail'
- Body hash mismatch when expect_sha256 provided — flagged as 'changed'
- Request exceeds 10 URL limit — schema validation error
- robots.txt disallows read — text extraction skipped when read:true
- Payment failure — x402 payment required before response is returned
- Invalid URL format — item-level error in response
Output
Schema · Response
{
"example": {
"signature": {
"alg": "ed25519",
"value": "base64...",
"key_id": "aw-attest-2026-08"
},
"attestation": {
"verdict": "pass",
"endpoint": "urls-witness",
"evidence": {
"count": 2,
"items": [
{
"url": "https://example.com/terms",
"index": 0,
"status": 200,
"verdict": "pass",
"findings": [],
"body_sha256": "9f2b…"
},
{
"url": "https://www.iana.org/",
"index": 1,
"status": 200,
"verdict": "pass",
"findings": [
"UNCHANGED"
],
"body_sha256": "9f2b…",
"expect_sha256": "9f2b…"
}
],
"summary": {
"fail": 0,
"pass": 2,
"changed": [],
"unreachable": [],
"indeterminate": 0
}
}
}
}
}Tags
x402
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