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ManyLives Proof Stamp
x402
ManyLives Proof Stamp is a paid API for AI agents from api.manylives.me, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Submits one or more SHA-256 hashes for timestamped, on-chain anchoring on the Base network, returning a stamp ID and expected on-chain commit time
Price / call$0.005
Success—
StatusUnknown
How this service works
Pay-per-call tools for people building AI agents: live web search and page contents, point-in-time crypto market data and news for backtests (no lookahead), verifiable track records of 1,000 crypto strategies locked on the Base network, company profiles, quick AI and batch prices. Ask us to turn a public website into a JSON endpoint. Pay per call, no account, free trial.
Output
Returns a JSON object with a 'stamped' array containing each hash's stamp_id, batch identifier, received_at timestamp, and a verify_with URL for future proof retrieval, plus an expected_on_chain_by time indicating when the batch will be committed to the Base blockchain.
Example use cases
Notarize a trading backtest result
“I just ran a backtest and I want to lock the result hash on-chain before I publish it — can you stamp SHA-256 hash a3f1b9c2d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1 on the Base network with the label 'Q3-backtest-ETH-momentum'?”
Prove document existence for audit
“I need a blockchain timestamp for this compliance report hash before I file it — please stamp 7c4d2e9f1a8b3c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2f1a0b9c8d7e6f5a4b3c2 on ManyLives with label 'compliance-report-2024'.”
Anchor AI agent decision log
“My AI agent just made a set of trade decisions and I want immutable proof of when they were made — stamp these two hashes on Base: b94f6b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9 and d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e, label them 'agent-decisions-nov-2024'.”
Technical details
Endpoint
POSThttps://api.manylives.me/paid/proof/stamp?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cheap ($0.005 per call), pay-per-call, no-account-required way to anchor one or more SHA-256 hashes on the Base L2 blockchain for proof-of-existence, audit trails, or notarization — especially in AI trading or compliance contexts where verifiable timestamps of backtest results or decisions are required.
Side effects
- Invalid SHA-256 hash format returns a 400 error
- Payment failure (insufficient USDC or x402 protocol error) blocks the request
- Hash already stamped in same batch may be deduplicated
- Network latency or Base chain congestion may delay on-chain commit beyond expected_on_chain_by
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| label | string | optional note for yourself |
| hashes | string | array of SHA-256 hex hashes (or hash: one) |
Output
Schema · Response
{
"type": "json",
"example": {
"stamped": [
{
"hash": "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
"batch": "2026-10-09T12",
"stamp_id": "stp_k3m8q2r7t9w4y6z2",
"received_at": "2026-10-09T12:00:00Z"
}
],
"verify_with": "GET https://api.manylives.me/paid/proof/verify?hash=9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08",
"expected_on_chain_by": "2026-10-09T13:10:00Z"
}
}Tags
x402
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