BitFex is an exchange with low commissions and the most favorable terms.
The main advantages of the exchange in comparison with others:
1) It does not require verification (confirmation of identity by passport data) at any stage, even in the derivation
2) Allows you to withdraw 0,002 BTC, so that beginners can try their hand at trading with crypto currency without risking large amounts
3) Input and output occur instantly, in fully automatic mode.
4) Commission for bidding is one of the lowest in the market, only 0.15%
5) The minimum transaction size is only 0,00001 BTC
6) Protecting Profiles with Two-Factor Authorization (2FA)
7) Support responds to all messages in the chat on the exchange

There are no restrictions on the withdraw
Instead of using exchangers with a high commission, you can simply buy or sell the crypto currency directly at the exchange rate.
P.S. For trading bots there is an API.
Link to the exchange:
https://bitfex.trade