Spot a risk-free arb in seconds.

When prices across books are long enough to back every outcome and lock a profit — i.e. implied probabilities sum to under 100%.

Stake each outcome in proportion to its implied probability so every result returns the same total.

Books price closely and adjust fast, so true arbs are brief and uncommon. They also limit or close accounts that exploit them. That's why a value-bet model — finding single mispriced lines — is the more durable edge.