Binance origin handler.

Bitstamp origin handler.

Bithumb origin handler.

Bittrex origin handler.

Coinbase origin handler.

Exchange handler.

Fx exchange handler.

Gateio exchange handler.

Gemini origin handler.

Hitbtc exchange handler.

Huobi origin handler.

Kucoin origin handler.

Loopring origin handler.

Okex origin handler.

OpenExchangeRates origin handler.

Poloniex origin handler.

Handler is interface that all Origin API handlers should implement.