FirmTape is an SPX dealer-positioning terminal. It rebuilds the dealer gamma book every second from the live options tape: zero-gamma flip, call and put walls, hold band, and a net-gamma percentile against the last 20 sessions. Every finished session since 2022 is free to replay and verify — 1,000+ sessions with full level history. The live stream is the paid part. It also ships an MCP server, so AI assistants can pull levels and backtest dealer-gamma rules against the full archive with honest out-of-sample stats.