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AgentRXI Bitcoin Timestamp (OpenTimestamps)
x402
AgentRXI Bitcoin Timestamp (OpenTimestamps) is a paid API for AI agents from agentrxi.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-15).
Anchors the SHA-256 hash of any text, file, or URL in the Bitcoin blockchain via OpenTimestamps calendars and returns a .ots proof file for later verification
Price / call$0.01
Success—
StatusUnknown
How this service works
Proof of existence: anchor the SHA-256 of any text, file or URL in the Bitcoin blockchain through OpenTimestamps calendars and get the .ots proof file, so anyone can later verify the data existed at that time. Also callable as GET with the same fields as query parameters.
Output
A .ots (OpenTimestamps) proof file that cryptographically links the SHA-256 hash of the submitted data to a Bitcoin block, which anyone can later verify to confirm the data existed at or before the timestamp. The proof can be independently validated using any OpenTimestamps-compatible verifier.
Example use cases
Notarizing a contract before signing
“I need to anchor this contract text in the Bitcoin blockchain to prove it existed before we signed it — can you timestamp this SHA-256 hash 'a3f1c2b4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2' and give me the .ots proof file?”
Proving authorship of creative work
“I just finished writing a short story and want to prove I authored it before publishing — please timestamp the following text in the Bitcoin blockchain and return the OpenTimestamps proof file: 'Once upon a time in a city of mirrors, a girl discovered she cast no reflection...'”
Archiving a web page snapshot
“Can you create a Bitcoin blockchain proof of existence for this URL so I can prove its content was captured at this moment? The URL is https://example.com/press-release-2025-06-01.html”
Technical details
Endpoint
GEThttps://agentrxi.com/v1/timestamp?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a trustless, decentralized, tamper-proof record that a specific piece of data existed at a particular moment in time — anchored to the Bitcoin blockchain — without relying on a centralized notary. It is ideal for legal documents, creative works, contracts, software releases, or any content where provenance and timestamp integrity matter. Use it over centralized timestamp services when auditability and censorship-resistance are priorities.
Side effects
- Invalid or missing input (no text, url, sha256, or content_base64 provided) — returns 400 error
- Malformed base64 content — returns parsing error
- OpenTimestamps calendar servers temporarily unavailable — may delay or fail proof generation
- URL provided is unreachable or returns non-200 — content cannot be fetched for hashing
- Payment not completed (x402) — returns 402 Payment Required before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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