The aforementioned Gemini is a leading New York-based cryptocurrency exchange. It holds a Bitcoin double auction every day at 4 PM ET.
source https://www.google.com/url?rct=j&sa=t&url=http://www.allaboutalpha.com/blog/2018/09/27/cryptocurrency-arbitrage-two-looks/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNFpor_EmTjL8yhPrroSCKgf5WWEXg
