David Duncan's Personal Blog

My morning game plan opens with a gamma-exposure snapshot — the one read that tells you whether the day will mean-revert and pin or trend and extend. Then it started printing UNAVAILABLE. GEX lives and dies on open interest, so here’s why a paid options API wasn’t the fix, and how CBOE’s free public feed brought it back — with the insight that makes the “free and delayed” version actually correct.

I wired TradingView’s Remix AI chart copilot and a fill-annotated charting pipeline into my trade reviews, so every chart shows my real entries and exits — hosted on my own site and embedded straight into my Notion trading journal.

The Finviz Elite export API is powerful but undocumented — column IDs are bare integers with no spec. Here’s how a JSON Schema catalog solves that and powers a pre-market gap scanner that feeds a daily trading game plan.