1inch.exchange is a DEX aggregator, it helps to find the best price, it "Achieves best rates by splitting orders among multiple DEXes in one single transaction".
You can choose the Limit additional price slippage and the GAS fee of the transaction.
They also have limit orders.
There are multiple ways you can connect your wallet:
The Decentralized Exchanges included are Uniswap, Bancor, 0x Relays, Oasis, Kyber, Airswap, Curve.fi, PMM.
MultiSplit uses more exchanges to achieve the best rates:
It shows prices in external exchanges too, like Binance or Bittrex.
You can follow them on Twitter for more news!