flashalpha 

Official .NET SDK for the FlashAlpha options analytics API. Live options screener, gamma exposure (GEX), delta exposure (DEX), vanna exposure (VEX), charm exposure (CHEX), VRP and harvest scores, implied... More information

Official .NET SDK for the FlashAlpha Historical API — point-in-time replay of GEX, gamma flip, VRP, narrative, max pain, 0DTE, and the full stock summary at any minute back to 2018-04-16. Backtest options... More information

FlashAlpha options-flow and dealer-positioning data as QuantConnect LEAN custom-data bars. GEX, DEX, VEX, vol surface, 0DTE, VRP, max-pain.