Vodoo:
you specify a team and the $ per point-- per point that beats or loses the spread(not straight up!!). Maximum is up to 20 points, but you can specify any lower cap that you wish:
say you liked NE yesterday, and said $100 action points cap at 10-- you would've won 10 dimes; or lost up to that much if Cleveland had instead beaten the spread. If you had not specified a cap, it'd have been 20 dimes, or whatever the particular book has as a max.
If you only want to risk, say-- $100, & divide it by 20, leaving a bet of $5, then if your team covers by a FG, you win a whopping $15... BFD....
HTH