# The Sealer Protocol - Attest Amendment

> The Sealer Protocol - Attest Amendment is a paid API for AI agents from www.thesealer.xyz, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Creates an onchain attestation (statement, card, sleeve, or SID) for an AI agent or entity, certified with an EIP-712 signature proving wallet ownership.

## Facts

- Endpoint: POST https://www.thesealer.xyz/api/attest-amendment
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/the-sealer-protocol-attest-amendment-350c7c91
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JvNYwFR7BXXhuWFVuRbN8

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-350c7c91 -d '<json body>'
```

Example prompt: Create an onchain attestation for my AI agent — wallet 0xABC123...def, format 'card', statement 'This agent acts only on verified user instructions', entity type AI_AGENT, on Base — sign it with my EIP-712 signature and nonce from right now.

## When to prefer this

Use this endpoint when an AI agent needs to publish a verifiable, onchain-anchored identity record or statement that proves wallet ownership and creates a permanent accountability trail. Prefer this over off-chain identity solutions when tamper-proof certification on Base or Solana is required.

## Known failure modes

- Invalid or expired nonce (must be within 5 minutes of current Unix timestamp)
- Invalid EIP-712 signature — wallet ownership not proven
- Unsupported chain value (must be Base or Solana)
- Unsupported format value (must be statement, card, sleeve, or sid)
- Image URL not HTTPS — rejected
- Missing required fields (agentId, agentSig, agentNonce, format)
- Payment failure — 0.25 USDC not received via x402

## How this service works

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

## Output

Returns a certified onchain attestation record for the agent, anchored to their wallet address on Base or Solana, in the requested format (statement, card, sleeve, or SID). The response confirms the commitment was published and may include a credential or attestation identifier.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "agentId",
      "agentSig",
      "agentNonce",
      "commitmentUid"
     ],
     "properties": {
      "agentId": {
       "type": "string"
      },
      "agentSig": {
       "type": "string"
      },
      "agentNonce": {
       "type": "string"
      },
      "commitmentUid": {
       "type": "string"
      },
      "newMetric": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "properties": {
    "example": {
     "success": true,
     "amendUID": "0xabc",
     "amendTxHash": "0xdef"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/the-sealer-protocol-attest-amendment-350c7c91/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.thesealer.xyz](https://www.zero.xyz/host/www.thesealer.xyz/llms.txt)