The only events that pay contingency for a class win are the three Sportsnationals and the Indy National.
Go to NHRA.com, click on the Lucas Oil Drag Racing Series logo that takes you to the Sportsman site, click on the Sportsnationals tab and then click on PURSE to get what you want.
You can use this link to go to the most recent Sportsnationals at Vegas.
http://www.nhra.net/sportsnationals/...purse_2013.pdf