Beauty & Personal Care · x402 · early usage

Validate EIP-712 typed structured data and derive its domain separator, message hash, a…

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

by apiacre.com · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls2

30d payers2

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

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

Tags: crypto · evm · ethereum · eip-712 · typed-data · bazaar · payment-identifier

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

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

Output example

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

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/27739.json for the price and payment options.
Pay. Call GET https://apiacre.com/v1/crypto/typed-data-hash. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0xa0BFa4f07281c9b248DC3AED2217836BcA24869B	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	B4CHWQeQn7GDLZD2aW6hpGG2bEseisBFLZYECA3HDLan	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xa0BFa4f07281c9b248DC3AED2217836BcA24869B",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "B4CHWQeQn7GDLZD2aW6hpGG2bEseisBFLZYECA3HDLan",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "data": {
          "description": "Structured EIP-712 hash result",
          "properties": {
            "domainSeparator": {
              "type": "string"
            },
            "messageHash": {
              "type": "string"
            },
            "primaryType": {
              "type": "string"
            },
            "signingHash": {
              "type": "string"
            },
            "valid": {
              "type": "boolean"
            }
          },
          "type": "object"
        },
        "meta": {
          "properties": {
            "cached": {
              "type": "boolean"
            },
            "duration_ms": {
              "minimum": 0,
              "type": "integer"
            },
            "next_actions": {
              "description": "Optional separately priced follow-up calls. Each action requires a new payment challenge and explicit buyer authorization.",
              "items": {
                "properties": {
                  "authorization_required": {
                    "const": true,
                    "type": "boolean"
                  },
                  "checkout_path": {
                    "pattern": "^/try/",
                    "type": "string"
                  },
                  "executes_automatically": {
                    "const": false,
                    "type": "boolean"
                  },
                  "handoff_path": {
                    "description": "Free full contract and spend-capped command handoff; reading it does not execute or purchase the follow-up.",
                    "pattern": "^/catalog/",
                    "type": "string"
                  },
                  "handoff_payment_required": {
                    "const": false,
                    "type": "boolean"
                  },
                  "input_template": {
                    "description": "Client-side template only: $request refers to the original input, $result to this response, and $json(...) serializes its argument. The server does not execute the follow-up.",
                    "type": "object"
                  },
                  "maximum_atomic_usdc": {
                    "pattern": "^[1-9][0-9]*$",
                    "type": "string"
                  },
                  "method": {
                    "const": "POST",
                    "type": "string"
                  },
                  "path": {
                    "pattern": "^/v1/",
                    "type": "string"
                  },
                  "price": {
                    "pattern": "^\\$[0-9]+",
                    "type": "string"
                  },
                  "reason": {
                    "type": "string"
                  },
                  "sample_path": {
                    "pattern": "^/samples/",
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "service": {
                    "type": "string"
                  },
                  "title": {
                    "type": "string"
                  },
                  "use_output": {
                    "type": "string"
                  }
                },
                "required": [
                  "service",
                  "title",
                  "reason",
                  "method",
                  "path",
                  "price",
                  "input_template",
                  "use_output",
                  "handoff_path",
                  "checkout_path",
                  "sample_path",
                  "maximum_atomic_usdc",
                  "handoff_payment_required",
                  "executes_automatically",
                  "authorization_required"
                ],
                "type": "object"
              },
              "type": "array"
            },
            "sources": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "warnings": {
              "items": {
                "type": "string"
              },
              "type": "array"
            }
          },
          "required": [
            "duration_ms",
            "cached",
            "sources",
            "warnings",
            "next_actions"
          ],
          "type": "object"
        },
        "request_id": {
          "description": "Unique request identifier",
          "type": "string"
        },
        "service": {
          "const": "crypto.typed-data-hash",
          "type": "string"
        },
        "version": {
          "const": "1",
          "type": "string"
        }
      },
      "required": [
        "request_id",
        "service",
        "version",
        "data",
        "meta"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "data": {
      "domainSeparator": "string",
      "messageHash": "string",
      "primaryType": "string",
      "signingHash": "string",
      "valid": true
    },
    "meta": {
      "cached": true,
      "duration_ms": 0,
      "next_actions": [
        {
          "authorization_required": true,
          "checkout_path": "string",
          "executes_automatically": true,
          "handoff_path": "string",
          "handoff_payment_required": true,
          "input_template": {},
          "maximum_atomic_usdc": "string",
          "method": "string",
          "path": "string",
          "price": "string",
          "reason": "string",
          "sample_path": "string",
          "service": "string",
          "title": "string",
          "use_output": "string"
        }
      ],
      "sources": [
        "string"
      ],
      "warnings": [
        "string"
      ]
    },
    "request_id": "string",
    "service": "string",
    "version": "string"
  },
  "type": "string"
}

Examples

curl

curl -X POST 'https://apiacre.com/v1/crypto/typed-data-hash' -H 'Content-Type: application/json' --data '{"typed_data":{"domain":{"name":"API Acre Example"},"message":{"contents":"Hello"},"primaryType":"Message","types":{"EIP712Domain":[{"name":"name","type":"string"}],"Message":[{"name":"contents","type":"string"}]}}}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://apiacre.com/v1/crypto/typed-data-hash", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"typed_data\":{\"domain\":{\"name\":\"API Acre Example\"},\"message\":{\"contents\":\"Hello\"},\"primaryType\":\"Message\",\"types\":{\"EIP712Domain\":[{\"name\":\"name\",\"type\":\"string\"}],\"Message\":[{\"name\":\"contents\",\"type\":\"string\"}]}}}"
});
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
import json
res = httpx.request("POST", "https://apiacre.com/v1/crypto/typed-data-hash", json=json.loads("{\"typed_data\":{\"domain\":{\"name\":\"API Acre Example\"},\"message\":{\"contents\":\"Hello\"},\"primaryType\":\"Message\",\"types\":{\"EIP712Domain\":[{\"name\":\"name\",\"type\":\"string\"}],\"Message\":[{\"name\":\"contents\",\"type\":\"string\"}]}}}"))
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: apiacre.com
Endpoint: https://apiacre.com/v1/crypto/typed-data-hash
Machine-readable: /resources/27739.json