Saitama Seibu Lions vs Tohoku Rakuten Golden Eagles Saitama Seibu Lions
Saitama Seibu Lions win the NPB game originally scheduled for August 22, 2026 at 5:00 AM ET. Listed on both Kalshi and Polymarket; recorded continuously since Aug 22, 2026. Live.
Price history, both venues (7 days)
Mid price of the YES side per venue, 5-minute buckets, from continuously recorded order books. Breaks mean the recorder was down or a book was empty.
Recent disagreement windows
| Opened | Closed | Length | Scans | Max net edge |
|---|---|---|---|---|
| Aug 22, 7:10 AM ET | Aug 22, 7:44 AM ET | 35 min | 8 | 1.43% |
| Aug 22, 5:50 AM ET | Aug 22, 6:34 AM ET | 44 min | 6 | 4.62% |
Related markets on both venues
Frequently asked questions
What are the current Kalshi and Polymarket odds for "Saitama Seibu Lions vs Tohoku Rakuten Golden Eagles Saitama Seibu Lions"?
As of the latest recorded books, Kalshi's YES mid is 0.0¢ (bid —, ask —) and Polymarket's is 0.0¢ (bid 0.999, ask —) — a —¢ gap. Prices are recorded continuously; this page refreshes every few minutes.
Has this market been an arbitrage?
Yes — 2 separate windows where buying the cheaper side on each venue cost less than $1 after both fees, first on Aug 22, 2026 and most recently Aug 22, 2026. The largest net edge was 4.62% and windows averaged 39 minutes.
Do both contracts resolve the same way?
The pair was confirmed as the same question (AI-matched · 95%). That judgment covers the headline question; resolution rules can still differ in edge cases (sources, timing, ties). Read both venues' rules before treating a gap as risk-free.
What do the fees do to the gap?
Kalshi charges takers 7% × price × (1 − price) per contract; Polymarket charges its category rate on the same curve. Near 50¢ that is roughly 1.75¢ per contract on Kalshi and 1–1.75¢ on Polymarket, so a visible gap of 3–4¢ is typically the minimum before anything is left.
← every Kalshi↔Polymarket pair · resolution criteria · taker fees · match: AI-matched · 95%. Verify both markets' rules yourself; this is data, not advice.