The Gemini auction trading option is used mostly by advanced traders and the CBOE to set the price for its bitcoin futures. Our TOP 5 Reads: 1. Gemini block trading is a digital peer to peer block trading system, designed for trading larger amounts with reduced slippage outside the normal Gemini order books. The exchange provides a basic trade order service, and also auction and block trade orders used by large traders. Choose whether you want to buy or sell currency and the pairs you want to trade. Is Gemini Recommended?