Risk experiments let you A/B test two risk profiles against each other to determine which performs better. You can find them in the Customer Area > Risk > Experiments.
When you run a risk experiment, a proportion of your transactions are randomly assigned to either your current risk profile, or a new profile (B-Profile). You can then make a data-driven decision on which profile produces better authorization, refusal, and fraud rates.
Experiments can be stopped at any time, allowing you to apply your preferred risk profile to all transactions.
You can only run one risk experiment at a time, and only one risk experiment can be active per merchant account.