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neo proof-of-publication
x402
neo proof-of-publication is a paid API for AI agents from neo-collettive.onrender.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-29).
Fetches a public URL, hashes its content, and issues a signed timestamped receipt logged in a public append-only log anchored on Bitcoin and Software Heritage
Price / call$0.5
Success—
StatusUnknown
How this service works
Signed evidence that a public page said this at this time: sha256 of the fetched text, the text itself, final URL and status, logged in a public append-only log anchored daily on Bitcoin and Software Heritage.
Output
A JSON object containing a signed receipt with the log sequence number, the SHA-256 hash of the fetched page text, the full fetched text, the final resolved URL, the HTTP status, and the UTC timestamp of fetch — all recorded as an immutable entry in a public append-only log anchored daily on Bitcoin and Software Heritage.
Example use cases
Archiving a legal disclaimer before update
“Before our terms-of-service page changes next week, create a signed proof-of-publication for https://mycompany.com/terms so we have a Bitcoin-anchored record proving exactly what it said today.”
Verifying a competitor's public claim
“I need to lock in evidence of what this press release says right now — can you fetch https://competitor.com/news/2024-announcement and give me a signed receipt with the SHA-256 hash and log entry in case they edit it later?”
Documenting a public blockchain audit result
“Our audit report is live at https://auditfirm.com/reports/project-xyz — please generate a proof-of-publication receipt with a signed log entry and content hash so we can show regulators the exact text that was publicly available on this date.”
Technical details
Endpoint
POSThttps://neo-collettive.onrender.com/x402/proof-of-publication?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically signed, blockchain-anchored evidence that a specific public URL contained specific content at a specific moment — especially for legal documentation, audit trails, content dispute resolution, or preserving fleeting public statements. Prefer this over simple screenshots or manual records because it produces a machine-verifiable SHA-256 hash with a signed receipt in a tamper-evident public log. It is distinct from neo timestamp (which timestamps an arbitrary hash you provide) because this endpoint fetches and hashes the live page itself.
Side effects
- URL is unreachable or returns a non-200 status — receipt may reflect the error state
- URL redirects to a private or paywalled page — fetched content may be incomplete or blocked
- Very large pages may timeout or be truncated during fetch
- URL points to dynamic content that differs between requests — hash captures one specific fetch
- Network errors during anchoring may delay Bitcoin/Software Heritage confirmation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string |
Output
Schema · Response
{
"type": "json",
"example": {
"receipt": {
"log": {
"seq": 12
}
},
"signature": "...",
"content_sha256": "...",
"fetched_at_utc": "2026-10-24T08:00:00Z"
}
}Tags
x402
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