crypto · crypto · evm · ethereum · eip-712 · typed-data · hash

EIP-712 hash

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

$0.01 USDCBase + Solanax402 v2POST

Pay $0.01 USDC and run in your browser View free result sample

Endpoint

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

Send the JSON body below. An unpaid request returns HTTP 402 with a PAYMENT-REQUIRED header; an x402-compatible buyer signs the requirement and retries with PAYMENT-SIGNATURE.

Pay $0.01 USDC and run in your browser

Official Coinbase agent path

Coinbase Agentic Wallet can satisfy this x402 request in one command. Running it may pay automatically, so --max-amount is fixed to $0.01 USDC in atomic units. Copying the command does not install, authenticate, sign, or pay; review the request and use a separate low-value wallet before running it.

npx --yes awal@latest x402 pay https://apiacre.com/v1/crypto/typed-data-hash \
  -X POST \
  -d '{"typed_data":{"types":{"EIP712Domain":[{"name":"name","type":"string"}],"Message":[{"name":"contents","type":"string"}]},"primaryType":"Message","domain":{"name":"API Acre Example"},"message":{"contents":"Hello"}}}' \
  --max-amount 10000 \
  --json

Coinbase pay-for-service documentation · Buyer setup and wallet safety

Alternative third-party AgentCash commands

Run check first without payment. Its fetch command may automatically pay up to the exact listed price.

npx --yes agentcash@latest check https://apiacre.com/v1/crypto/typed-data-hash
npx --yes agentcash@latest fetch https://apiacre.com/v1/crypto/typed-data-hash \
  --method POST \
  --header 'content-type: application/json' \
  --body '{"typed_data":{"types":{"EIP712Domain":[{"name":"name","type":"string"}],"Message":[{"name":"contents","type":"string"}]},"primaryType":"Message","domain":{"name":"API Acre Example"},"message":{"contents":"Hello"}}}' \
  --payment-protocol x402 \
  --payment-network base \
  --max-amount 0.010

AgentCash CLI documentation

Input example

{
  "typed_data": {
    "types": {
      "EIP712Domain": [
        {
          "name": "name",
          "type": "string"
        }
      ],
      "Message": [
        {
          "name": "contents",
          "type": "string"
        }
      ]
    },
    "primaryType": "Message",
    "domain": {
      "name": "API Acre Example"
    },
    "message": {
      "contents": "Hello"
    }
  }
}

Response shape

View free static sample JSON

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

Try the payment challenge

curl -i -X POST 'https://apiacre.com/v1/crypto/typed-data-hash' \
  -H 'content-type: application/json' \
  --data '{"typed_data":{"types":{"EIP712Domain":[{"name":"name","type":"string"}],"Message":[{"name":"contents","type":"string"}]},"primaryType":"Message","domain":{"name":"API Acre Example"},"message":{"contents":"Hello"}}}'