Kalshi runs the same kind of YES/NO event markets as Polymarket, but it's CFTC-regulated and legal for US residents. We build bots that arbitrage within Kalshi books and across to Polymarket where regulation allows. Technically: Kalshi's Trade API + our Polymarket CLOB client in a single execution path, with venue-aware risk caps.
Internal Kalshi sum-to-one + cross-venue Polymarket↔Kalshi on shared events.
Kalshi-only sum-to-one. YES + NO < $1.00 on the same Kalshi market. Less common than on Polymarket (tighter books) but lower fee structure compensates.
Polymarket ↔ Kalshi on shared events. The same election, the same crypto threshold, two different prices. Dedicated page →
Kalshi orders are legal for US residents; Polymarket is not. We route by your jurisdiction and refuse to deploy cross-venue legs from blocked geographies.
Geographic check is enforced in code, not policy. Bot refuses cross-venue legs from blocked jurisdictions.
# Kalshi arbitrage config - example strategy: "kalshi-sum-to-one" venues: - kalshi - polymarket # cross-venue mode markets: kalshi_filter: series: ["PRES", "BTCD", "FED"] min_volume_usdc_24h: 15_000 cross_venue_mapping: enabled: true matcher: "semantic" # LLM-assisted event matching confirm_pct: 0.85 manual_review_below: 0.85 execution: min_edge_cents: 1.5 slippage_bps: 50 geographic_check: true # refuse cross-venue if user in blocked region
Lower volatility, narrower spreads, smaller edges. Volume compensates - Kalshi handles steady flow without big gaps.
'Will Trump win in 2028?' on Polymarket vs 'PRES-2028-DEM' series on Kalshi. We use semantic matching + a human review layer for ambiguous cases. Default: human-confirm below 0.85 similarity.
Some Kalshi series have explicit per-trade fees ($0.07 minimum) that eat small edges. We model this per-series and skip unprofitable markets.
If you're in a US state where Polymarket isn't accessible, you can run Kalshi-only. Don't try to be clever - we won't help.
Stable signal, persistent edges.
Kalshi's flagship series. Long-running markets, deep books, recurring opportunities.
Tight books but very frequent. Cross-venue mapping straightforward.
Polymarket has more liquidity here, Kalshi has stricter fees. Cross-venue is where this category lives.
Internal Kalshi arbitrage. Legal for US users.
Polymarket + Kalshi with semantic matching and geo-checked execution.
If you're US-based and want to trade prediction markets legally, Kalshi is the starting point. We'll quote in 5 business days.