SDKs - StellarX402

Official packages. All are open source and versioned independently.

Client

Package	Language	Use
`@stellarx402/client`	TypeScript / JavaScript	Buyer-side: `fetchWithPayment`, `discover`, wallet adapters.
`stellarx402-client`	Python	Same surface, ported.

npm install @stellarx402/client
# or
pip install stellarx402-client

Server middleware

Package	Framework	Notes
`@stellarx402/express`	Express	Reference middleware.
`@stellarx402/hono`	Hono	Same API, Hono context.
`@stellarx402/next`	Next.js	App-router and pages-router variants.
`stellarx402-fastapi`	FastAPI	Python.

Facilitator

Package	Use
`@stellarx402/facilitator`	Embeddable facilitator (see Self-Facilitation).
`stellarx402/facilitator` (Docker image)	Standalone facilitator for operators.

MCP

Package	Use
`@stellarx402/mcp`	MCP server helpers that publish to the Bazaar automatically.

Version compatibility

All SDKs at the same minor version are compatible with each other and with a facilitator on the same minor. Bumping the facilitator’s major version requires bumping SDKs.