| Merchant | Domain | Country | Program Approval |
|---|---|---|---|
| optimallyme.com | Not Listed | Open | |
| optimistdrinks.com | Not Listed | Open | |
| optimum.com | Multiple | Open | |
| optimumnutrition.com | Multiple | Open | |
| optimumoutfit.co.uk | Not Listed | Open | |
| optinmonster.com | Multiple | Open | |
| optionsmedicalweightloss.com | Not Listed | Open | |
| optipreg.de | Not Listed | Open | |
| optishotgolf.com | Multiple | Open | |
| optisleep.no | Not Listed | Open |