# Bot Bazaar EIP-712 Domain Hash Checker

> Bot Bazaar EIP-712 Domain Hash Checker is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Computes the exact Keccak-256 EIP712Domain typeHash and domainSeparator for Base USDC or any custom EIP-712 contract domain by verifying contract address.

## Facts

- Endpoint: GET https://bot-bazaar.fly.dev/v1/x402/eip712-domain-check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bot-bazaar-eip-712-domain-hash-checker-894431fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fkiDE85dS4aj-Dt0RTRaQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability bot-bazaar-eip-712-domain-hash-checker-894431fa
```

Example prompt: Can you compute the EIP712Domain typeHash and domainSeparator for the Base USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913?

## When to prefer this

Use this endpoint when you need to programmatically verify or compute EIP-712 domain hashes for smart contracts deployed on Base, especially for permit-style token approvals or signature validation workflows. Prefer this over manual computation when working with Base USDC or custom EIP-712 contracts and needing on-chain verified values rather than locally derived ones.

## Known failure modes

- Invalid or malformed 0x contract address returns an error
- Contract not deployed on Base network yields no bytecode result
- Network or RPC issues may cause lookup failures
- EOA address (non-contract) may return empty or unexpected domain data

## How this service works

Compute the exact Keccak-256 EIP712Domain typeHash and domainSeparator for Base USDC or any custom EIP-712 contract domain.

## Output

Returns the computed Keccak-256 EIP712Domain typeHash and domainSeparator for the specified Base contract, enabling verification of EIP-712 structured data signing parameters. Includes the canonical domain components used to derive these values.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "verifying_contract": {
       "type": "string",
       "description": "Verifying contract 0x address on Base"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bot-bazaar-eip-712-domain-hash-checker-894431fa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bot-bazaar.fly.dev](https://www.zero.xyz/host/bot-bazaar.fly.dev/llms.txt)