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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-sdk repository.

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)
    • Staging smoke test: https://echo.staging.ax402.io/echo/get?test=1
    • TypeScript only: batch-settlement scheme + browser wallet signer

Control plane (seller automation)

TypeScriptFull surface — MFA, facilitator, batch buyer.GoCore automation + exact buyer for CI/CD.PythonSync/async control plane + exact 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

@axlabs/ax402-sdk + /buyer + batch

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Paying gateway URLsControl plane (seller automation)Related