# FOR DEVELOPERS

- [API](/for-developers/api.md): This section describes methods for interacting with the Xpress platform. These methods are categorized into three types.
- [Contract API](/for-developers/api/contract-api.md): All trades and token transfers are executed in the contract.
- [Common objects](/for-developers/api/common-objects.md): HTTP and WS API operates with almost identical objects.
- [HTTP API](/for-developers/api/http-api.md): All endpoints use HTTP GET requests with several URL parameters. All responses are encoded in JSON format.
- [Websocket API](/for-developers/api/websocket-api.md): If you connect to the WebSocket endpoint, you can subscribe to some channels and receive updates about objects.
- [SDK](/for-developers/sdk.md)
- [OnchainLobClient](/for-developers/sdk/onchainlobclient.md)
- [OnchainLobSpot](/for-developers/sdk/onchainlobspot.md)
- [Router Integration](/for-developers/router-integration.md)