Layer

One API for prediction markets. Find markets, stream normalized data, place orders, and track positions across Kalshi and Polymarket.

Layer tells your bot or AI agent which markets are the same bet, shows prices and order books in one format, places and cancels orders, and reports what filled. Your bot decides what counts as a good trade. Venues word the same event differently, and sometimes settle it differently. Prices, order books and fees from every venue in one format. One way to place and cancel orders on every venue, from your own account.