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AOTrust Time Attestation
x402
AOTrust Time Attestation is a paid API for AI agents from api.aotrust.link, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Creates a cryptographically signed timestamp bound to a SHA-256 payload hash, anchored in a cumulative Merkle log for tamper-evident proof of existence at a point in time.
Price / call$0.002
Success—
StatusUnknown
How this service works
Signed time attestation: timestamp bound to a payload hash, anchored in the cumulative Merkle log
Output
A signed time attestation object containing the timestamp bound to the submitted payload hash, a cryptographic signature, and an anchor reference in AOTrust's cumulative Merkle log — enabling third-party verification that the hash existed at that moment in time.
Example use cases
Legal document existence proof
“I need to prove that this contract existed before we signed it — can you create a signed timestamp attestation in AOTrust for this SHA-256 hash: b94f3e21a0dc456789abcdef0123456789abcdef0123456789abcdef01234567?”
Software release integrity anchor
“We're releasing version 2.4.0 of our software tonight — please anchor this build artifact hash c0ffee1234567890abcdef1234567890abcdef1234567890abcdef1234567890 in AOTrust so we have a tamper-evident record of when it was published.”
Research data timestamping
“I need to timestamp my dataset hash before submitting to the journal — create an AOTrust Merkle-anchored time attestation for hash deadbeef1234567890abcdef1234567890abcdef1234567890abcdef12345678.”
Technical details
Endpoint
POSThttps://api.aotrust.link/v1/attest/time?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, low-cost cryptographic proof that a specific payload hash existed at a known point in time, anchored in a verifiable Merkle log. Prefer it over blockchain-based timestamping when you want fast, cheap attestation without full on-chain transaction overhead, and when you plan to retrieve a full evidence bundle (PDR + inclusion proof) later via the sibling AOTrust Evidence Bundle endpoint.
Side effects
- Invalid payload_hash format (not 64 lowercase hex characters) — returns 400 validation error
- Payment failure or insufficient USDC balance — returns 402 Payment Required
- Rate limiting or quota exceeded — returns 429 Too Many Requests
- Merkle log anchor service temporarily unavailable — returns 503
- Duplicate hash submission may return the same or a new attestation depending on policy
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payload_hash | string | sha256 hex of the payload |
Tags
x402
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