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web-attestation.selfradiance.workers.dev Web Attestation
x402
web-attestation.selfradiance.workers.dev Web Attestation is a paid API for AI agents from web-attestation.selfradiance.workers.dev, paid per call via x402, $1/call, status unknown (last checked 2026-10-11).
Returns an Ed25519-signed cryptographic attestation of the raw byte response observed at a caller-supplied HTTPS URL, without making any claims about content truth or legitimacy.
Price / call$1
Success—
StatusUnknown
How this service works
Returns an Ed25519-signed witness-only byte-observation attestation for a caller-supplied HTTPS URL.
Output
A JSON object containing: a base64 or hex Ed25519 signature, a structured payload with the attestation type, a key ID (kid), a unique attestation ID, the observed timestamp, the canonicalized request details (method, URL, redirect policy), response metadata (HTTP status, ok flag, content-type), and a SHA-256 hash of the response body bytes (with truncation info if body exceeded 1 MB). Includes a human_notice clarifying this is a byte-observation receipt only with no truth claims.
Example use cases
Example prompt
“Can you get me a cryptographically signed Ed25519 attestation witnessing exactly what bytes https://api.example.com/data returns right now — I need the SHA-256 hash, HTTP status, and the signed payload as proof?”
Technical details
Endpoint
GEThttps://web-attestation.selfradiance.workers.dev/attest?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, cryptographically verifiable byte-level witness receipt for an HTTPS URL's current response — particularly useful for audit trails, dispute resolution, or proving to third parties what a URL returned at a specific moment. Prefer this over a simple web scraper when tamper-evidence and a signed timestamp matter. Not suitable if you need content interpretation, truth verification, or structured data extraction.
Side effects
- Target URL is not reachable or returns a network error — attestation cannot be produced
- Target URL is HTTP (not HTTPS) — only HTTPS URLs are supported
- URL returns a redirect — redirect_policy is manual_no_follow so no redirect is followed, response reflects the redirect itself
- Response body exceeds 1 MB — body is truncated and truncated flag is set to true
- Payment of 1 USDC not provided via x402 — returns 402 Payment Required
- Invalid or malformed URL input — returns error response
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://www.example.com"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"kid": "web-attestation-2026-06-14",
"payload": {
"kid": "web-attestation-2026-06-14",
"body": {
"hash_alg": "sha-256",
"max_bytes": 1048576,
"truncated": false,
"sha256_hex": "ff67a9d764d6a2367a187734e697f6a53217db9a21c101d410a113ca871a299d",
"bytes_hashed": 559,
"hash_subject": "response_body_bytes",
"complete_body_observed": true
},
"claims": "none",
"request": {
"url": "https://www.example.com",
"method": "GET",
"redirect_policy": "manual_no_follow"
},
"response": {
"ok": true,
"http_status": 200,
"content_type": "text/html"
},
"observed_at": "2026-06-16T17:38:23.671Z",
"human_notice": "Byte-observation receipt only. Attests that this endpoint observed the above response at the stated time. No claim as to truth, legitimacy, ownership, or trustworthiness of the content.",
"attestation_id": "WA-BHQLtxPtiPD6",
"attestation_type": "byte_observation.v1",
"canonicalization": "RFC8785-JCS"
},
"signature": "RDfJxqaImlZ9TRUJzM4f6ZGijqEwtewVWQLr6PlOeunc6PVnFQ5GWatvgmag6w5XhITT7zMH05Q1-XvxhlWaDw"
}Tags
x402
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