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enclave402 EIP-712 Agent State Attestation
x402
enclave402 EIP-712 Agent State Attestation is a paid API for AI agents from enclave402.com, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-18).
Creates a non-repudiable, timestamped EIP-712 cryptographic attestation binding an agent ID and a keccak256 state digest, settled via x402 micropayment on Base
Price / call$0.04
Success—
StatusUnknown
How this service works
Enclave402: x402 pay-per-call gateway on Base. Live Polymarket signals, IPFS pinning, EIP-712 attestations. Receipt-gated settlement, replay protection, no charge on failure.
Output
Returns a JSON object containing: a Unix millisecond timestamp (ts), the keccak256 hex digest of the submitted state (digest), a fully populated EIP-712 typed-data object (eip712), a verification hint for ethers.verifyTypedData, the attestor wallet address, a hex signature, a unique attestationId, and a settled:true flag confirming the $0.04 USDC x402 micropayment completed. teeQuote and enclaveRpc fields are null (not a hardware TEE attestation).
Example use cases
Audit trail for autonomous trading decision
“My trading agent 'did:web:example.com:agents:trader' just decided to hold rather than sell — create a timestamped EIP-712 attestation of that decision with state '{"task":"rebalance","decision":"hold","portfolio":"ETH-USDC"}' so I have a non-repudiable record if there's a dispute later.”
Agent hand-off with verifiable state snapshot
“Before my planner agent 'agent-planner-7' hands off to the executor, I need a cryptographic attestation that the current task state is '{"phase":"planning_complete","subtasks":["fetch","analyze","report"]}' — stamp it now so the receiving agent can verify it wasn't tampered with.”
Escrow condition proof for smart contract release
“I need proof that agent 'agent-0x402-escrow' declared the delivery condition met at this exact moment — attest the state '{"condition":"delivered","orderId":"ORD-9921","confirmedBy":"agent-0x402-escrow"}' with an EIP-712 signature so we can use it as evidence to release the escrow funds.”
Technical details
Endpoint
POSThttps://enclave402.com/api/agent/attestWhen to prefer
Use this endpoint when you need a lightweight, offline-verifiable, non-repudiable timestamp proof of an agent decision or state — specifically when EIP-712 compatibility and ethers.js verification are required. Prefer it over on-chain EAS when you want to avoid gas costs and block confirmation latency, and over hardware TEE attestations when cryptographic signing suffices. Ideal for audit trails, agent hand-offs, and escrow condition documentation where a signed, timestamped record is the requirement.
Side effects
- Payment failure: x402 settlement rejected — no charge applied, attestation not issued
- Invalid agentId: empty or exceeds 200-character limit returns validation error
- State payload too large: exceeds 8192-character maxLength limit
- Malformed JSON in state field may still be accepted but is hashed as raw UTF-8 string
- Network or signing service unavailability returns 5xx with no charge
- Attempting to use for hardware TEE or zk proofs — this endpoint does not provide those guarantees
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| state | string | Serialized state, decision, or payload hash to bind. Hashed with keccak256(utf8); the raw string is never stored. |
| agentId | string | Stable identifier or EVM address of the agent being attested. |
Output
Schema · Response
{
"type": "json",
"example": {
"ts": 1767225600000,
"digest": "0x3333333333333333333333333333333333333333333333333333333333333333",
"eip712": {},
"verify": "ethers.verifyTypedData(...)",
"settled": true,
"attestor": "0x2222222222222222222222222222222222222222",
"teeQuote": null,
"signature": "0x4444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444",
"enclaveRpc": null,
"attestation": "SIGNED",
"teeProvider": null,
"attestationId": "0x1111111111111111111111111111111111111111111111111111111111111111"
}
}Tags
x402
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