JSON Contracts

About JSON Contracts

Use JSON Contracts with your agent

claude mcp add json-contracts -- npx -y json-contracts

{
  "mcpServers": {
    "json-contracts": {
      "command": "npx",
      "args": [
        "-y",
        "json-contracts"
      ]
    }
  }
}

Frequently asked questions

What is JSON Contracts?

JSON Contracts is an MCP (Model Context Protocol) server by json-contracts in the Autonomous Agents category. JSON contract registry and validator for structured LLM and agent outputs.

How do I connect JSON Contracts to Claude, Cursor, or another MCP client?

Install JSON Contracts from its npm package (json-contracts) and register it under "mcpServers" in your client's MCP configuration — for example claude_desktop_config.json or Cursor's mcp.json — then restart the client.

Is JSON Contracts open source?

Yes — the source code is public at github.com/json-contracts/json-contracts, with 1 GitHub stars.

Can AI agents pay to use JSON Contracts?

Not yet through Loomal — JSON Contracts is listed as a free directory entry. If its maintainer verifies ownership, they can set per-call USDC pricing that agents pay over x402, with settlement on Base.