Read IV on the chain
Compare IV across strikes/expiries to visualize skew and term structure for a symbol page.
Glossary
What Is Implied Volatility (IV)? Options IV Explained
Implied volatility (IV) is the volatility input that makes a pricing model’s theoretical value match the observed option market price — a compact summary of priced uncertainty.
Unique context: OptionData can attach implied volatility to qualifying real-time prints and option-chain snapshots, and you can aggregate IV in historical SQL across 2.8B+ stored trades.
How developers use IV
IV shows up in scanners, surfaces, and risk filters alongside Greeks and premium.
Read IV on the tape
High-premium prints with elevated IV can flag vol-sensitive flow for further review.
Aggregate historically
SQL quantiles of IV by symbol/day help set baselines before alerting on “rich” or “cheap” vol.
Pair with Greeks
Vega-sensitive structures care about IV; Delta-heavy flow may be more directional. Use both fields.
IV vs related ideas
- Implied vol — forward-looking, from option prices
- Historical/realized vol — backward-looking from underlying returns
- IV rank/percentile — IV vs its own history (you compute)
- Vega — sensitivity of price to IV
- OptionData: IV on chains and qualifying prints
- Always model-based — not a promise of future moves
Example: session IV stats for AAPL flow
SELECT
symbol,
avg(implied_volatility) AS avg_iv,
quantile(0.9)(implied_volatility) AS iv_p90,
sum(size * price * 100) AS premium
FROM RawOptionTrades
WHERE date = today() AND symbol = 'AAPL' AND implied_volatility > 0
GROUP BY symbol;Continue learning
Link IV to Greeks, chains, and quant SQL workflows.
Implied volatility FAQ
What is implied volatility in one sentence?
IV is the volatility level implied by current option prices under a pricing model — a market-implied uncertainty measure.
Is IV the same as historical volatility?
No. Historical volatility measures past underlying moves; IV is inferred from live option prices and is forward-looking.
Does OptionData provide IV via API?
Yes. IV can appear on option-chain REST responses and on qualifying real-time trade messages, and can be queried in historical SQL.
Why do flow tools show IV with premium?
Premium sizes the trade economically; IV helps interpret whether the market is pricing rich or cheap uncertainty around that contract.