apiacre.com Typed Data Hash

x402

apiacre.com Typed Data Hash is a paid API for AI agents from apiacre.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Validates EIP-712 typed structured data and computes its signing digest (hash).

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Validate EIP-712 typed structured data and derive its domain separator, message hash, and signing digest.

Output

Returns a validation status indicating whether the typed data conforms to EIP-712 structure, along with the computed signing digest (hash) if valid, or descriptive error details if validation fails.

Example use cases

Permit signature digest for DeFi

“I'm building a permit-based token approval flow. Can you validate this EIP-712 typed data for the Permit message and return the signing digest so I can pass it to my wallet?”

Debugging malformed typed data

“My dApp keeps rejecting this typed data before signing — can you validate the EIP-712 structure and tell me if there are any errors, then give me the hash if it's valid?”

Offchain delegation message hashing

“I have an EIP-712 delegation message with a domain, types, and message payload. Please validate it and compute the signing digest I need to include in my offchain signature workflow.”

Technical details

Endpoint

POSThttps://apiacre.com/v1/crypto/typed-data-hash

When to prefer

Choose this endpoint when you need to programmatically validate EIP-712 typed structured data and obtain its signing digest before presenting it to a wallet or signer. Useful in agent workflows that construct permit, delegation, or order messages and need to verify correctness and compute the hash without executing an on-chain transaction.

Side effects

Malformed or missing domain separator fields cause validation error
Incorrect or mismatched type definitions return a schema error
Missing primaryType or undefined types result in rejection
Message values that don't match declared types return type mismatch errors
Invalid or unsupported Solidity types in the type definitions cause parsing failure

Input

Schema · Request body

Field	Type	Description
typed_data	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {
      "valid": true,
      "messageHash": "0xd6a9eadbfb49313d8b83d02d2bb22b916a5b16e6006946c9ca6fa7959d934b3a",
      "primaryType": "Message",
      "signingHash": "0x7433e410d5f2857cb42d0bfd31bc71e8aa553f02ce0eed397927f01dfb46424c",
      "domainSeparator": "0xc167959bdf834486717879a8cd6eb3e12a864d1b1d7dbcecec40455e1b4bc8c8"
    },
    "meta": {
      "cached": false,
      "sources": [],
      "warnings": [],
      "duration_ms": 42,
      "next_actions": []
    },
    "service": "crypto.typed-data-hash",
    "version": "1",
    "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a"
  }
}

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How this service works

Validate EIP-712 typed structured data and derive its domain separator, message hash, and signing digest.

Output

Returns a validation status indicating whether the typed data conforms to EIP-712 structure, along with the computed signing digest (hash) if valid, or descriptive error details if validation fails.

Example use cases

Permit signature digest for DeFi

“I'm building a permit-based token approval flow. Can you validate this EIP-712 typed data for the Permit message and return the signing digest so I can pass it to my wallet?”

Debugging malformed typed data

“My dApp keeps rejecting this typed data before signing — can you validate the EIP-712 structure and tell me if there are any errors, then give me the hash if it's valid?”

Offchain delegation message hashing

“I have an EIP-712 delegation message with a domain, types, and message payload. Please validate it and compute the signing digest I need to include in my offchain signature workflow.”

Technical details

Endpoint

POSThttps://apiacre.com/v1/crypto/typed-data-hash

When to prefer

Side effects

Malformed or missing domain separator fields cause validation error
Incorrect or mismatched type definitions return a schema error
Missing primaryType or undefined types result in rejection
Message values that don't match declared types return type mismatch errors
Invalid or unsupported Solidity types in the type definitions cause parsing failure

Input

Schema · Request body

Field	Type	Description
typed_data	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {
      "valid": true,
      "messageHash": "0xd6a9eadbfb49313d8b83d02d2bb22b916a5b16e6006946c9ca6fa7959d934b3a",
      "primaryType": "Message",
      "signingHash": "0x7433e410d5f2857cb42d0bfd31bc71e8aa553f02ce0eed397927f01dfb46424c",
      "domainSeparator": "0xc167959bdf834486717879a8cd6eb3e12a864d1b1d7dbcecec40455e1b4bc8c8"
    },
    "meta": {
      "cached": false,
      "sources": [],
      "warnings": [],
      "duration_ms": 42,
      "next_actions": []
    },
    "service": "crypto.typed-data-hash",
    "version": "1",
    "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a"
  }
}