Ranking SPCX call spreads four different ways
Recorded in cvforge on July 17, 2026 by ConvexValue · Published July 25, 2026
Every call spread on SPCX ranked by probability of success, expected return, risk and capital efficiency, with the expected move shown alongside.
Exact prompt
Give me a dashboard that lets me find the the best call-spread trade on $SPCX. I want to be able to rank by probability of success, expected return, risk, capital efficiency. I want to be able to visualize expected move and probability of success.
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
fair_market_value, strike_price, expiration_date, contract_type, delta, implied_volatility, open_interest, day_volume
How to read it
Asking for four rankings at once is deliberate, because they disagree. The highest-probability spread is narrow and pays little; the highest expected return sits further out and usually loses. There is no spread that wins all four columns.
That disagreement is the useful output. Sort by each in turn and the trade-off surface becomes visible, which is a better basis for choosing than any single “best” answer would be. The expected-move panel is the sanity check: a spread whose upper strike sits outside the implied move is pricing a move the chain does not expect.
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.
- Rankings are arithmetic on Massive fair market value estimates, not advice. FMV is not an executable price, and nothing here accounts for your account, margin, assignment risk or taxes.
- Multi-leg structures are valued leg by leg using FMV estimates. cvforge has no option quote or last-trade data with which to model fills or transaction costs.
Related demos
- META call spreads compared on P&L, probability and efficiency
- MRVL to 500, but not through 200: sizing a two-sided view
- A bounded SPCX view turned into a bounded structure
Search focus: call spread screener ranked. Related: best call spread finder, rank call spreads capital efficiency. Originally posted on X.