You got a couple of alternatives here: https://swapmarket.github.io
Goes without saying that you can always spin up your own backend too. Open Source ftw 🙌
Discussion
To be clear: got nothing against Boltz. But just to be aware of the possible alternatives you have for submarine swaps, without having to spin up your own. Bolts here posts a great resource.
You also have robosats which is federated: http://robosatsy56bwqn56qyadmcxkx767hnabg4mihxlmgyt6if5gnuxvzad.onion