I honestly believe that you should not use any "ready" bought product. If you are interested in triangular arbitrage you should learn to code it (ie. python) to know what your bot is doing. Triangular arbitrage is still working, mostly not on the highest volume coins and it is not hard to learn the basics of developing this kind of bot. Especially when you can use many free sources on how to do it.

I was trading the Forex for about 14 years and I tested many many trading robots but just 2 of them was working on the long run. You have to build experience to know when you are about to be scammed!!! Just ask yourself: why should anybody sell a profitable bot?

Good news is, triangular arbitrage is still working very fine. And with the right lines of code you can generate a steady profit!