The same bet, priced twice.
Kalshi and Polymarket quote the same outcomes at different prices. QuoteFlow puts them side by side, nets out the fees, and shows you which venue is actually cheaper.
Two order books, one outcome
A prediction market contract pays exactly $1 if it happens and $0 if it doesn't. That payout is identical on both venues — so any difference in price is a difference in what you pay for the same thing.
Matched by hand
Every market is paired outcome by outcome, not by an algorithm reading titles. Automatic matching pairs the Ethiopian prime minister with Fiji's and calls it an arbitrage. Ours can't, because a human wrote the mapping.
Fees included
Kalshi's fee peaks near 50¢ and almost vanishes at the extremes, so the better-looking quote is sometimes the worse fill. Every number is all-in cost, never the raw price.
Only real books count
A market showing no bid and a hopeful ask isn't a price you can trade against. Those quotes are shown, flagged, and left out of the maths — so the edge on screen is edge you could actually take.
Where the gaps are right now
Live, from both venues' public APIs. “Cheaper” means cheaper after fees, and only quotes with a real bid behind them are counted. The board filters to gaps worth more than 8% of the position.
Why the gap exists
The two venues barely share users. Kalshi is a US-regulated exchange funded by bank transfer; Polymarket settles in stablecoin on a blockchain. Moving money between them is slow enough that small differences survive — and neither one has any reason to point you at the other's better price.
What it doesn't do
QuoteFlow is read-only. It holds no funds, places no orders, and takes custody of nothing — it reads both venues' public APIs and does arithmetic. When it finds a gap, you trade it on the venue itself. It isn't affiliated with Kalshi or Polymarket, and nothing here is financial advice.
See today's board
Every paired market, both venues, updated continuously — with a budget box that tells you what an edge is actually worth at your size.
Open the board