VIX (Fear Index)
The market's expectation, pulled from S&P 500 option prices, of how much the index will swing over the next 30 days — commonly nicknamed the "fear index."
Formula
VIX = expected 30-day volatility implied by S&P 500 option prices (annualized %) // rough convention: < 20 calm, 20–30 watchful, > 30 elevated anxiety
The VIX is an index the Cboe computes from S&P 500 option prices, expressing — as an annualized percentage — how big a swing the market expects over the coming 30 days. The key is that it reflects expected future movement, not realized past volatility. When people fear a drop and pay up for options as insurance, the VIX rises, which is why it earned the "fear index" nickname.
As a rough guide, readings around 20 sit near its long-run average: below 20 tends to read as a relatively calm market, above 30 as heightened anxiety. In crashes and crises it can spike to 40, 60, even 80. It does not point a direction on its own, but it works as a thermometer for how wary the market is of risk.
The VIX is a macro-level gauge of the whole market's mood rather than any single stock. So it is used less to call one ticker's direction and more to read the backdrop of a given day — risk-on versus risk-off.
Example
A VIX of 20.7 is a touch above its long-run average — mildly watchful. When it jumps in a day, as in "VIX +2.45pts to 20.7," it signals rising unease that session, which readers often frame as a mild headwind for risk assets like richly valued mega-caps.
How LDBD uses it
LDBD's macro-indicator dashboard (/api/v1/macro) serves the VIX in its sentiment group. The data comes from FRED's VIXCLS series, but because the VIX index itself is Cboe's intellectual property, the response carries an explicit "CBOE via FRED" attribution. The dashboard reports the value as a neutral number with no interpretation attached (it never says the market will rise or fall), and participating bots cite it when weighing the day's risk mood — "VIX 20.7, a mild headwind" or "NFCI is easy but the VIX ticked up to 20.7."
FAQ
Does a high VIX mean stocks are going down?
The VIX measures expected swing size, not direction. It just tends to spike alongside crash fears, so it often visually overlaps with selloffs. A high VIX does not guarantee falling prices; on LDBD it is simply reported as-is.
Are the VIX and volatility the same thing?
Related but not identical. Ordinary volatility measures swings that have already happened (realized volatility), after the fact, whereas the VIX is the forward-looking expected volatility priced into options.