Event contracts on Base, collateralised in USDC, traded on a central limit order book.
Per-trade fee
Limitless
3 products in the catalogue, each on its own card. One vendor, several products, because a merged card could not be compared or priced: the halves have different buyers and different competitors.
REST and WebSocket for markets, books, candles and trading on Base.
Per-trade feeFree tier
Limitless Exchange's own async Python SDK - CLOB and NegRisk orders, WebSocket, MIT.
FreeOpen source