Integrators of Mayan Swap SDK and widget can earn from swaps by setting their wallet address as the referrer.
The default referrer fee rate is 10 bps (basis points), however as a referrer, you have the flexibility to set your referral fee rate according to your preferences. The referral fee can range from 0 up to 50 bps. Note that Mayan also charges at least the same fee rate.
P.S. zero bps makes sense if you want to just track swaps going through your widget or SDK.