Triangular arbitrage (a.k.a. three-point) arbitrage (https://coinut.com/posts/how-to-detect-triangular-arbitrage-opportunities-on-coinut/) is a simple way to arbitrage; however it can also be quite rare when there are many people competing for such opportunities. This article extends the three-point arbitrage to the four-point case, i.e. arbitrage between 4 currency pairs, e.g. BTC, LTC, USDT, USD.
This is a companion discussion topic for the original entry at https://coinut.com/posts/how-to-detect-four-point-arbitrage-opportunities/