Yes, we do support markup-based Pricing for temp.
If you typically set the pay rate and have staffing firms charge a markup % to determine the bill rate, select the option shown below when creating a temp JobCast.
When candidates are submitted to this JobCast, staffing firms will provide the markup % they are submitting this candidate at, which you can view in the "Responses" tab within the candidate card.
As a reminder, the markup % is multiplied by the pay rate to determine the bill rate.