What the skew chart measures
For one option type and expiration, the chart plots reported implied volatility against strike price. IV is an input inferred from an option price under a model. A smile has higher values toward both wings; downward or upward skew describes an asymmetric strike pattern. The chart does not measure investor identity, prove fear or optimism, or establish that an option is cheap.
Inspect the returned sample
- Enter a supported stock or ETF ticker and choose calls or puts, then load snapshots. Changing the ticker or side clears the previous result so calls cannot remain under a puts label.
- Check returned and eligible counts, and whether additional pages were reported. Each request reads at most 250 rows sorted by strike. Low strikes can dominate a truncated result, and expiration choices are not a complete calendar.
- Select up to five expirations. Colored dots are observations; line segments are visual guides. The table shows the first selected expiration, or all eligible rows when no expiration is selected.
- Inspect the contract identifier and the provider’s available daily-bar close, Greeks, open interest and volume. Missing fields remain a dash; zero is retained. The bar close is not an executable bid or ask.
Compare like contracts before interpreting shape
Lower strikes are OTM for puts and ITM for calls; higher strikes reverse that relationship. A sloped call curve should not automatically be described as demand for OTM puts. For matched European contracts, consistent prices and model inputs connect call and put values through put–call parity. Differences in reported IV can reflect quote times, spreads, exercise assumptions, dividends or data quality.
Flat IV across returned strikes does not prove a complacent market. Steep IV does not prove overpricing. Check bid/ask spreads, quote age, exercise style and scheduled events elsewhere before evaluating a hypothesis. The graph does not fit an arbitrage-free surface or test a strategy.
What an expiration overlay can show
Compare maturities at similar moneyness and with events in view. A fixed strike is not a fixed forward moneyness across expirations. Near-term IV can be above or below longer-term IV; it need not have a steeper skew. Differences between two curves alone do not demonstrate profitable calendar, diagonal, butterfly or ratio spreads.
Coverage and freshness
Eligible observations require the selected call/put type, a standard 100-share contract, a valid unexpired UTC date, positive finite strike and IV, and a contract identifier. Duplicate identifiers are removed. Expiration-day rows may remain; this page does not determine the contract’s settlement time. Invalid or missing IV is excluded rather than replaced by zero.
Option snapshots can be cached for one hour, with additional upstream delays. The displayed retrieval time is not an IV observation time. The optional stock quote is fetched separately and may be asynchronous; a failed stock quote does not prevent an IV chart. No historical chain, automatic refresh, option execution or TradingView data transfer is provided.
Sources: Massive snapshot fields and pagination, OIC put–call parity, and OIC pricing-model limits.