This page will tell you if there are any cyclical arbitrage opportunities in the points eco-system right now.
An arbitrage opportunity is defined as a cyclical transfer path in which you will be able to gain more of whatever points you are starting with.
For example, if we had the following transfer path:
1 USD -> 2 Chase Points
2 Chase Points -> 2 USD
We can see how there is an arbitrage opoprtunity to convert 1 USD to 2 USD.