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EIP-712 Typed-Data Digest
x402
EIP-712 Typed-Data Digest is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Computes the EIP-712 typed structured-data hash (digest) for a given domain, types, primaryType, and message object, returning the canonical hash used for signing.
Price / call$0.003
Success—
StatusUnknown
How this service works
EIP-712 typed-data digest — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok:true, the type field 'eip712-hash', the computed hash digest, a payment receipt containing the transaction hash, USD amount charged, and a unique receipt ID, plus a generated_at ISO8601 timestamp.
Example use cases
Permit signature pre-image verification
“Before I sign this ERC-20 permit, can you compute the EIP-712 digest for me? The primaryType is 'Permit', domain is name 'DAI' version '1' chainId 1 verifyingContract '0x6B175474E89094C44Da98b954EedeAC495271d0F', and the message has owner '0xAbc...', spender '0xDef...', value '1000000000000000000', nonce 0, deadline 1999999999.”
Vote struct hash for governance signing
“I need the EIP-712 hash for a governance Vote struct — primaryType 'Vote', domain name 'MyDAO' version '1' chainId 137, message fields proposalId '42' support true voter '0x123...'. Give me the digest so I can verify the signing payload matches what my wallet will produce.”
Off-chain order hash for a DEX
“Calculate the EIP-712 typed-data digest for an off-chain DEX order — primaryType 'Order', domain name 'ExchangeV3' version '3' chainId 1 verifyingContract '0xExchangeAddr', with types for Order including makerAsset, takerAsset, makerAmount, takerAmount, and salt, and the message filled with my specific trade parameters.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/eip712-hash?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a trustless, on-demand EIP-712 typed-data digest without running a local Ethereum library. Ideal for agents that need to verify, audit, or pre-compute EIP-712 hashes before signing, especially in environments where ethers.js or viem are not available. Prefer this over generic ABI-encode endpoints when you specifically need the EIP-712 domain-separated hashStruct output.
Side effects
- Malformed or missing 'types' object causes validation error
- Mismatched primaryType not found in types definition
- Invalid domain object structure returns error
- Non-EVM or non-hex addresses in domain/message may cause encoding failure
- Payment failure on x402 protocol returns 402 before computation
- Unsupported Solidity type in types definition causes ABI encoding error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "eip712-hash",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.003,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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