# ManyLives Proof Stamp

> 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

## Facts

- Endpoint: POST https://api.manylives.me/paid/proof/stamp?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/manylives-proof-stamp-6f4695b6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FJ6M0pMyHaV5PN2nCrdso

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability manylives-proof-stamp-6f4695b6 -d '<json body>'
```

Example prompt: Stamp this SHA-256 hash on the Base blockchain so I have verifiable proof it existed right now — hash is 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08, label it 'backtest-2024-Q1'.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "label": {
   "type": "string",
   "examples": [
    "example"
   ],
   "description": "optional note for yourself"
  },
  "hashes": {
   "type": "string",
   "examples": [
    [
     "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"
    ]
   ],
   "description": "array of SHA-256 hex hashes (or hash: one)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/manylives-proof-stamp-6f4695b6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.manylives.me](https://www.zero.xyz/host/api.manylives.me/llms.txt)