What to check in the first minute after a drop alert

A drop alert from the Pinnacle odds API is a starting pistol, not a decision. Each alert arrives with the price before and after the fall and a no-vig fair price attached. Four checks, in order, turn it into a decision: confirm the move is real and new, compare your bookmaker's price against the fair price, size the stake from the edge, and record the price you took for the closing line.

Check the alert itself

Read the fields before the prices. The alert names the match, the league, the market, the side and the period, and stamps the time in Unix seconds. First confirm you have not handled it before: restarts and reconnects can hand you the same batch twice, so your dedupe records decide whether the alert is new.

Then look at the move. The feed measures a drop as the fall divided by the old price, so 2.37 to 2.25 is a 5.06% drop, as the site's pages document, checked 2026-09-29. The same percentage on a 1.50 favorite and on a 5.00 outsider are different events, so read the probability shift as well as the percentage. The dropping odds calculator uses the same formula as the feed, which makes it the right place to test a threshold before you trust it.

Compare your book against fair, not the old price

The number that matters is nvp, the no-vig fair price after the move, which every alert carries. Hold your bookmaker's current price against it.

A 5% drop that still leaves your book below the fair price is not a bet. The drop tells you where the sharp market went; the fair price tells you whether anything is left for you. Many bookmakers move after Pinnacle does, and the gap between the two moves is where the value sits, so this comparison has a shelf life measured in minutes.

Put a number on the edge

If your book's price beats the fair price, the expected value is the price times the fair chance, minus one. Worked with the example on the EV calculator: a fair price of 2.17 means a fair chance of 46.13%, and a bookmaker price of 2.25 gives an EV of +3.80%. Positive EV at this price.

Negative or near-zero EV ends the workflow here. A drop can be loud and still offer nothing once your book's own margin is priced in.

Size the stake from the edge, then cut it

The Kelly criterion turns the edge into a fraction of the bankroll. On the numbers above, full Kelly comes to 3.04% of the bankroll, and the quarter Kelly that most bettors actually stake is 0.76%, or 7.61 on a bankroll of 1,000. The Kelly staking guide walks through the formula and the reasons almost nobody bets the full figure: the fair chance is an estimate, and full Kelly swings hard when the estimate is off.