SPCX open interest as a heatmap, and the one strike that stands out
Recorded in cvforge on June 17, 2026 by ConvexValue · Published July 25, 2026
The same grid built on open interest rather than volume, which surfaces standing positions instead of today’s trading — a single July call dominated.
Exact prompt
Give me a visualization of $SPCX open interest with a heatmap across strikes and expirations.
Data cadence
Live U.S. option snapshots, refreshed through the session. Open interest is an end-of-previous-day figure and updates once daily.
Plan requirements
Runs on the free cvforge app and the free data tier (20 requests/hour). No card needed.
Fields used
day_volume, open_interest, strike_price, expiration_date, contract_type, underlying_price
How to read it
Swapping volume for open interest changes what the map means entirely. Volume is one session’s activity and resets tomorrow; open interest is the accumulated stock of positions that are still open, so a bright cell here is a standing bet rather than a busy day.
That makes this the better view for finding levels that matter structurally. In this build a single July call dominated the grid — the kind of concentration that is invisible in a volume heatmap the day after it was established, and visible here for as long as the position lives.
Change it
The prompt is the interface. Ask for a different ticker, a different expiration window, or an extra column in the same sentence style and the agent edits the app in place — you do not start over, and you do not wait for anyone to build it.
Limitations
- Snapshot data, not a transaction tape: the build reads the chain as it stands, so it cannot attribute a trade to a buyer or a seller.
- Open interest updates once a day, so an intraday volume/OI comparison is always this session’s volume against yesterday’s open interest.
- Contract coverage is U.S. listed equities, ETFs and indices. Indices use the I: prefix, for example I:SPX.
- Current per-contract valuation is Massive fair market value (FMV), a proprietary estimate. cvforge does not provide option bids, asks, midpoint, quote sizes, NBBO or last trades, and FMV is not an executable quote.
- Concentration at a strike shows where contracts changed hands, which is not the same as where the underlying is expected to settle.
Related demos
- NOK’s most traded options, three ways
- Next week’s most traded single-stock options under 0.30 delta
- Where the top 100 names’ call and put volume actually sits
Search focus: open interest heatmap by strike and expiration. Related: spcx open interest grid, largest open interest strike finder. Originally posted on X.