we support any ERC20 (ethereum - based) token.
in the future, i'd love to integrate other blockchains, starting with bitcoin. one nice property of ethereum is that gitcoin core never has access to your funds, because they are locked into a smart contract. gitcoin doesnt want to be a money transmitter, so if we can figure out some sort of chain abstraction layer that can do something similar with bitcoin, that'd be preferable.