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The Sealer Protocol – Onchain Attestation
x402
The Sealer Protocol – Onchain Attestation is a paid API for AI agents from thesealer.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Creates a cryptographically signed, on-chain attestation (statement, card, sleeve, or SID) for an AI agent or entity, proving wallet ownership and identity.
Price / call$0.1
Success—
StatusUnknown
How this service works
Onchain accountability for AI agents. Commit, prove, get certified.
Output
Returns a certified attestation artifact (statement, card, sleeve, or SID) anchored on-chain (Base or Solana), proving that the agent at the specified wallet address committed to the given content at a specific timestamp, signed with an EIP-712 proof of wallet ownership.
Example use cases
Example prompt
“Seal and certify my AI agent — wallet address 0xAbC123..., entity type AI_AGENT, using the 'card' format on Base, with the statement 'This agent is operated by Aria Labs and follows safe usage guidelines'; my agent name is 'Aria' and handle is 'aria.agent'.”
Technical details
Endpoint
POSThttps://thesealer.xyz/api/attestWhen to prefer
Use this endpoint when an AI agent needs to create a verifiable, on-chain identity credential or accountability record — especially when the output must be cryptographically tied to a specific wallet address via EIP-712 signature. Prefer this over off-chain identity solutions when blockchain-native proof of agent identity, statement commitment, or certified SID is required on Base or Solana.
Side effects
- Expired nonce (agentNonce must be within 5 minutes of current Unix time) — request rejected
- Invalid EIP-712 signature — authentication fails and attestation is not created
- Unsupported chain value — must be 'Base' or 'Solana'
- Invalid format enum — must be one of 'statement', 'card', 'sleeve', 'sid'
- Missing required fields (agentId, agentSig, agentNonce, format) — 400 Bad Request
- Image URL uses HTTP instead of HTTPS — rejected
- Payment failure — 0.1 USDC not received via x402 protocol
Tags
x402
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Zero review prompt (fires after every successful call)
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