Besides Raiden, you can even impliment a simple state channel in about 50 lines of solidity & it shouldn't be too hard to adapt it to any token, see “Ethereum P

Besides Raiden, you can even impliment a simple state channel in about 50 lines of solidity & it shouldn't be too hard to adapt it to any token, see “Ethereum Payment Channel in 50 Lines of Code” by Matthew Di Ferrante https://link.medium.com/A4wqDWtj2S https://link.medium.com/A4wqDWtj2S