Layer gives developers one interface to find markets, stream normalized data, place orders, and track positions across Kalshi and Polymarket. Build your trading system once instead of rebuilding venue plumbing.
Kalshi and Polymarket word the same bet differently, and sometimes settle it differently. Layer reads both venues’ settlement rules, flags where they differ, and checks every match again once it settles.
Prices, spreads, and liquidity for matched markets, side by side. See which venue has the better trade.
A quoted price isn’t your price. Layer breaks down fees, spreads, and estimated slippage per trade, so your strategy prices reality instead of the quote.
Same call to place or cancel an order on Kalshi or Polymarket. Change the venue, keep the code.
After an order is sent: what filled, what you hold, and where your money is, in one shape across venues.
Replay real order books, not last-trade charts, with fees and fill simulation, before risking real money.
Matching, prices, execution, and fills for Kalshi and Polymarket, without rebuilding the plumbing.