The retired rules: pair completion, in full
The two-sided lane that looked best on paper and lost real money in three days. The rule, the cages, the orphan problem, and the repair that broke our own law.
Second in the Desk series on retired rules. This lane was stopped on 17 August 2026 after three days of real money. Every number in it is published here, because there is nothing left to protect.
Where the idea came from
A widely shared analysis of a Polymarket wallet that made about $126,000 resting on both sides of five-minute up-or-down markets. The mechanism is simple. Rest a bid on YES and a bid on NO, one cent inside the best bid on each side. The price wiggles, the legs fill at different moments, and if both fill you own a complete set for less than a dollar that pays exactly a dollar at settlement, whichever way it goes. The wallet ran about 79 percent of its legs into completed pairs.
This lane asked whether that has an echo on Kalshi's fifteen-minute crypto markets at our engine's speed.