There are currently the following fee sources;
-reserve-
Iron Bank (ib) has a variable reserve on interest generated from assets borrowed, this is generated via any assets supplied as collateral to ib, can read more about the different reserve factors at the official documentation. The reserve is fixed forex’ % of all generated reserve factor fees (currently 70%). So as more collateral is supplied to mint ib*assets, this reserve scales. (activated last week)
-borrow-
Whenever ib*assets are borrowed, users pay interest for borrowing. This scales with borrowing/demand/incentives. (active)
-olm-
Whenever a foreign option is executed, 1% of strike, whenever a KP3R/ETH olm is executed, 100% of strike. (inactive pending 2nd audit)
-v3 incentives-
50% of trading fees on lp positions supplied. (inactive pending 2nd audit)
-emission-
1% of future emission (inactive pending gov v2 on kp3r)
-job fees-
1% of job fees (inactive pending gov v3 on kp3r)
Can read more on the above on the medium