The undisputed king of atomic swaps is jl777 (he did them in 2014) his BarterDEX has done well over 20K swaps now, most using spv tech so you don't even have to download any blockchains, and if users are prepared to time-lock a KMD deposit they can be 0-conf too. BarterDEX has already done test 'etomic' swaps between KMD and ETH even.

It's absolute BS that Charlie Lee claims any credit for doing a few manual swaps with LTC, eventually the word will get out about BarterDEX, and people will naturally ask "why did Charlie ignore BarterDEX for so long?"

Holders of assets like DEX have already been paid 2mil USD from fees so far, just from the test alpha stage.