x402-sdk

x402 Payment Protocol SDK - Rust core with TypeScript & Python bindings.

Architecture

┌─────────────────────────────────────────────────────────────┐
│                      Rust Core                               │
│  (signing, payment logic, protocol parsing)                  │
└─────────────────────┬───────────────────────────────────────┘
                      │
         ┌────────────┼────────────┐
         ▼            ▼            ▼
    ┌─────────┐  ┌─────────┐  ┌─────────┐
    │  PyO3   │  │ napi-rs │  │  WASM   │
    │ binding │  │ binding │  │ binding │
    └────┬────┘  └────┬────┘  └────┬────┘
         │            │            │
         ▼            ▼            ▼
    ┌─────────┐  ┌─────────┐  ┌─────────┐
    │ Python  │  │ Node.js │  │ Browser │
    │   SDK   │  │   SDK   │  │   SDK   │
    └─────────┘  └─────────┘  └─────────┘

Repository Structure

x402-sdk/
├── spec/                  # OpenAPI spec & protocol docs
├── core/                  # Rust core implementation
├── bindings/              # FFI bindings (PyO3, napi-rs, WASM)
├── sdk/
│   ├── typescript/        # @x402/client, @x402/server, @x402/mcp
│   └── python/            # x402-client, x402-server, x402-mcp
└── docs/                  # Documentation

Packages

TypeScript/JavaScript

• @x402/client - Pay for x402-enabled APIs
• @x402/server - Monetize your APIs with x402
• @x402/mcp - MCP tool integration for AI agents

Python

• x402-client - Pay for x402-enabled APIs
• x402-server - Monetize your APIs with x402
• x402-mcp - MCP tool integration for AI agents

License

MIT