> ## Documentation Index
> Fetch the complete documentation index at: https://docs.madra.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# SDKs

> Official StellarX402 SDKs for clients, servers, and facilitators.

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.                                        |

```bash theme={null}
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](/advanced/self-facilitation)). |
| `stellarx402/facilitator` (Docker image) | Standalone facilitator for [operators](/getting-started/quickstart-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.