What the scanner found, week by week: every fee-clearing spread it listed on Kalshi, Polymarket and Polymarket US, how long each stayed listed, and when they appeared. Straight from the log, nothing picked by hand.
7867 fee-clearing spreads this week
cross-venue 7674 · Polymarket 176 · Kalshi 17
Best with size behind it: 22% on Polymarket ("How many hurricanes will form during the Atlantic Hurricane Season in "), 6 bundles resting.
Median time a spread stayed listed: 1.3 h.
Busiest hour: 4pm Pacific.
7806 of them had at least 5 bundles resting; about $24,550,946 of bundles were listed in total.
1556 fee-clearing spreads this week
cross-venue 1330 · Polymarket 210 · Polymarket US 10 · Kalshi 6
Best with size behind it: 8.0% on cross-venue ("Grizzlies vs. Trail Blazers: Grizzlies to win"), 9543 bundles resting.
Median time a spread stayed listed: 25 min.
Busiest hour: 5pm Pacific.
1543 of them had at least 5 bundles resting; about $6,601,044 of bundles were listed in total.
494 fee-clearing spreads this week
Polymarket 239 · cross-venue 216 · Polymarket US 34 · Kalshi 5
Best with size behind it: 23% on Polymarket ("Donald Trump # Truth Social posts October 16 - October 23, 2026?"), 100 bundles resting.
Median time a spread stayed listed: 7 min.
Busiest hour: 6pm Pacific.
490 of them had at least 5 bundles resting; about $670,550 of bundles were listed in total.
18 fee-clearing spreads this week
Polymarket 15 · Polymarket US 3
Best with size behind it: 5.4% on Polymarket ("Viking FK vs. FC Bayern München"), 514 bundles resting.
Median time a spread stayed listed: 9 min.
Busiest hour: 1pm Pacific.
18 of them had at least 5 bundles resting; about $9,613 of bundles were listed in total.
104 fee-clearing spreads this week
Polymarket 49 · Kalshi 30 · Polymarket US 20 · cross-venue 5
Best with size behind it: 24% on Kalshi ("Tampa Bay vs Dallas: Fantasy Points (TB vs DAL (Oct 8))"), 206 bundles resting.
Median time a spread stayed listed: 13 min.
Busiest hour: 10am Pacific.
103 of them had at least 5 bundles resting; about $27,357 of bundles were listed in total.
Spreads are small and short-lived; most are gone within minutes of appearing. Nothing here is advice. ArbTrader is free to start.