Yes, we do. Our main API is a websocket API using Micorsoft's SignalR. Partial documentation can be found here:
For convenience we have implemented some read-only REST API Endpoints that aim to mimic the calls of some other exchanges.
Binance style:
https://xs2.exchange/api/bn/v1/ping
https://xs2.exchange/api/bn/v1/time
https://xs2.exchange/api/bn/v1/exchangeInfo
https://xs2.exchange/api/bn/v1/depth
https://xs2.exchange/api/bn/v1/trades or api/bn/v1/historicalTrades
https://xs2.exchange/api/bn/v1/aggTrades
https://xs2.exchange/api/bn/v1/klines
https://xs2.exchange/api/bn/v1/ticker/24hr
https://xs2.exchange/api/bn/v1/ticker/price
https://xs2.exchange/api/bn/v1/ticker/bookTicker
Bittrex style:
https://xs2.exchange/api/btx/v1.1/public/getmarketsummaries
And for cryptocompare:
https://xs2.exchange/api/cryptocompare/v1/products
https://xs2.exchange/api/cryptocompare/v1/trades
We're currently working on getting some SDKs together for our websocket API.
If you have any questions, please contact support@xs2.exchange