# EIP-712 Typed Contract Builder MCP

> EIP-712 Typed Contract Builder MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-15).

Builds EIP-712 typed structured data definitions and contract signing payloads for Ethereum-compatible smart contract interactions.

## Facts

- Endpoint: POST https://api.m2mcent.com/eip712-typed-contract-builder-mcp/api/process?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eip-712-typed-contract-builder-mcp-bfa77a19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uo9RS4Ih_sevtdC3N4PYk

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 eip-712-typed-contract-builder-mcp-bfa77a19 -d '<json body>'
```

Example prompt: Build me an EIP-712 typed data structure for a token permit contract — the domain is 'MyToken' version '1' on chain ID 1, and the message should include owner address, spender address, value 1000, nonce 0, and deadline 9999999999.

## When to prefer this

Choose this endpoint when you need to programmatically generate EIP-712 typed structured data for smart contract interactions, permit functions, multisig payloads, or any Ethereum signing workflow that requires structured type definitions. Prefer this over manual encoding when building Web3 agent workflows that must produce wallet-signable payloads without deep Solidity knowledge.

## Known failure modes

- Malformed or incomplete data string input returns an error response
- Invalid Ethereum address formats in the data payload cause parsing failures
- Missing required domain fields (name, version, chainId) may result in incomplete output
- Unsupported Solidity types in type definitions may not be encoded correctly
- $0.10 USDC payment failure via x402 protocol blocks request processing

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a structured EIP-712 compliant typed data object including the domain separator definition, type definitions for all named types, and the encoded message payload ready for use with eth_signTypedData_v4 or similar wallet signing methods.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eip-712-typed-contract-builder-mcp-bfa77a19/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)