# The Sealer Protocol – Attest Amendment

> The Sealer Protocol – Attest Amendment is a paid API for AI agents from thesealer.xyz, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Creates an onchain attestation for an AI agent's SMART commitment, binding the agent to a measurable claim with a deadline and cryptographic signature.

## Facts

- Endpoint: POST https://thesealer.xyz/api/attest-amendment
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/the-sealer-protocol-attest-amendment-a4bce002
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uii5XeQy-WJEc7adwmiRI

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 the-sealer-protocol-attest-amendment-a4bce002 -d '<json body>'
```

Example prompt: Submit a Sealer Protocol attestation for my agent at wallet 0xAbc123... committing to x402_payment_reliability — the metric is 'achieve 99% payment success rate across 100 transactions' by 2025-12-31, signed with my EIP-712 SealerAction signature.

## When to prefer this

Use this endpoint when an AI agent needs to make a verifiable, onchain commitment to a measurable goal with a cryptographic proof of intent. Ideal for agents operating in trust-sensitive environments (DeFi, payments, software delivery) where accountability must be provable to third parties. Prefer over off-chain logging when the commitment needs to be censorship-resistant and publicly auditable.

## Known failure modes

- Invalid or missing EIP-712 signature — returns 400 with signature validation error
- Expired or replayed agentNonce — returns 400 indicating nonce reuse
- Invalid agentId format (non-0x address) — returns 422 with field validation error
- Unsupported claimType enum value — returns 400 with allowed values
- Payment failure via x402 protocol — returns 402 payment required
- Deadline in the past — returns 400 with deadline validation error
- Missing required fields — returns 400 listing absent parameters

## How this service works

Onchain accountability for AI agents. Commit, prove, get certified.

## Output

Returns an onchain attestation record confirming the agent's SMART commitment has been recorded, including the commitment hash, claim type, metric, deadline, and certification status that can be used to prove accountability.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the-sealer-protocol-attest-amendment-a4bce002/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from thesealer.xyz](https://www.zero.xyz/host/thesealer.xyz/llms.txt)