SpotGamma's data is sourced from:

• OPRA (Options Price Reporting Authority) — the consolidated feed of options quotes and trade data from all US options exchanges
• US options exchanges — direct exchange data feeds
• Proprietary calculations — SpotGamma's own models for dealer positioning, gamma exposure (GEX), HIRO, key levels, and related metrics are built on top of this raw data

The underlying options data is institutional-grade. The SpotGamma metrics you see on the platform (GEX, HIRO, Vol Trigger, Call/Put Wall, etc.) are not sourced from third parties — they are SpotGamma's own proprietary calculations derived from that raw data.