Palpable errors and cancellations

Palps are the reason the juiciest-looking arbs are the most dangerous ones. This page teaches the smell test and the recovery playbook for the day a leg vanishes anyway.

What counts as a palpable error #

Typos and slipped lines: odds of 8.10 where the market says 2.10, a handicap given to the wrong team, a decimal point in the wrong place, Over and Under swapped. Bookmaker terms (every single one has this clause) let them void such bets or restate them at the 'true' price, sometimes hours after acceptance.

The practical definition for an arber: any price far enough from the market consensus that the arb percentage looks like a gift. Bookmakers do not void normal pricing disagreements; they void gifts.

The smell test #

Four checks, ten seconds total, before betting a fat arb:

• Percentage: above roughly 10 percent, assume error until proven otherwise. The steady range is 1 to 5.
• Consensus: compare the suspicious leg against two or three other books on the same market. One book far from everyone is the signature of a palp.
• Odds history: OddStorm's history shows when the price appeared. A weird price that JUST appeared and no other book followed is fresh error, not fresh news.
• News check: sometimes one book truly is first (a lineup leak). If the sharp books are moving the same direction, it is news; if only one soft book jumped, it is a typo.

When a leg gets voided anyway #

You now hold an uncovered bet. In order:

• Re-cover immediately at the best available price, even locking a small loss: a known -2 percent beats an open coin flip.
• If an exchange lists the market, close the exposure there: lay what you backed (or back what the void left exposed).
• If the bookmaker offered resettled odds instead of a void, redo the arb math with the new price before deciding to keep or cover.

Where to go next #

Palps are one of the four ways a correct arb loses money; the beginner-mistakes guide covers the other three, and the limits guide explains why error-sniping also shortens account life.