SPX call and put strikes that could act as support and resistance
Recorded in cvforge on June 6, 2026 by ConvexValue · Published July 25, 2026
Where SPX open interest and volume concentrate above and below spot, framed as the levels traders watch for support and resistance.
Exact prompt
show me upcoming call/put levels that could act as support/resistance on $SPX
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
gamma, open_interest, day_volume, strike_price, expiration_date, contract_type, underlying_price
How to read it
This is the same underlying data as a gamma profile with the framing traders actually use: which strikes have enough open interest above and below spot to matter. Large call open interest overhead and large put open interest below is the ordinary shape, and the levels worth noting are the ones far larger than their neighbours.
The causal story is weaker than the chart suggests. Concentration marks where contracts were written, which may be a level people chose because it already mattered, rather than a level that matters because contracts were written there.
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.
- Gamma exposure is computed from open interest and a dealer-positioning assumption. The assumption is a convention, not observed positioning.
- Because open interest is a daily figure, intraday levels move only as spot and implied volatility move, not as positions change.
Related demos
Search focus: spx options support and resistance levels. Related: option strikes as support resistance, spx key option levels. Originally posted on X.