CrosschainSwap.com is the perfect .COM domain for providing a Cross-chain Atomic Swap Service; where multiple parties exchange assets across multiple blockchains. For example, trading bitcoin for ether.
Atomic cross-chain trading is the exchange of one cryptocurrency coin to another cryptocurrency token, without the need to trust a third-party.
Crosschain Projects like EXRNchain is developing an open-source cross chain protocol that supports atomic cross-chain swaps. If you are a Blockchain developer, that is a good place to start if looking to build an atomic swap platform on CrosschainSwap.com domain name.