Enter both sides of a two-way market. We strip out the vig (the juice) and return the no-vig fair probability, the fair price, and how much the book is holding.
Multiplicative devig: each side's fair probability is its raw implied probability divided by the total. The fair price is what you should be willing to pay if the line carried no juice.
Every two-way line is priced so both sides add up to more than 100% — that overround is the vig, the book's built-in margin. To know whether a bet is actually +EV, you first have to remove the vig and recover the true implied probability the market is really quoting.
A no-vig number tells you what's fair; it doesn't tell you whether anyone's fair value actually beats the market. ZenHodl publishes its closing-line value per sport from real trades, and the Edge Finder compares our calibrated fair value against live prices on Polymarket, Kalshi and sportsbooks at once.
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