BancorX:
"Having initially built Bancor on the Ethereum blockchain, Bancor is now evolving into a cross-chain liquidity protocol starting with added support for EOS. Bancor will allow users to perform instant EOS-based token conversions against its automated smart contracts, also known as Relays. "

Source:
https://blog.bancor.network/announcing-bancorx-the-first-cross-blockchain-decentralized-liquidity-network-aebb6a0dad8d