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SDKS

SDK overview

Control plane + buyer across languages

Ax402 SDKs provide buyer helpers to pay gateway URLs and control-plane clients to manage APIs, endpoints, domains, and keys. They ship from the ax402-sdks repository.

npm packages

Packagenpm
@ax402/sdknpmjs.com/package/@ax402/sdk
@ax402/clinpmjs.com/package/@ax402/cli
@ax402/mcp-servernpmjs.com/package/@ax402/mcp-server
@ax402/react-paywallnpmjs.com/package/@ax402/react-paywall

Go module: github.com/AxLabs/ax402-sdks/go. Python: ax402-sdk (source in ax402-sdks; PyPI coming soon).

Paying gateway URLs

Start here if you consume paid APIs. Buyer clients sign x402 payments against gateway hostnames — not AX402_BASE_URL.

Buyer clientsTypeScript, Go, Python — pay gateway URLs from code.React paywallBrowser wallet UI for SPAs (exact + batch-settlement).
  • Env: AX402_EVM_PRIVATE_KEY (same as CLI pay url and MCP)
    • Example: https://my-api.ax402.io/v1/foo
    • Batch-settlement: TypeScript, Go, and Python buyer modules; browser wallet via React paywall

Control plane (seller automation)

TypeScriptFull surface — MFA, facilitator, batch buyer.GoCore automation + buyer for CI/CD.PythonSync/async control plane + buyer.
SDK integrationControl plane vs buyer — when to use each.CLIShell automation with the same API surface.MCP serverAgent tools for Cursor and Claude.

Buyer clients

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TypeScript

@ax402/sdk + /buyer + /platform

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npm packagesPaying gateway URLsControl plane (seller automation)Related