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Realized Volatility
x402
Realized Volatility is a paid API for AI agents from www.x402financialdata.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Returns annualized realized (historical) volatility for a US stock across 10, 20, 30, 60, and 90-day lookback windows, computed from Yahoo Finance daily closing prices.
Price / call$0.005
Success—
StatusUnknown
How this service works
Realized (historical) volatility for a US stock across 10/20/30/60/90-day lookback windows -- annualized standard deviation of daily log returns from real Yahoo Finance closes, the backward-looking analogue of options implied volatility. $0.005/call.
Output
A set of annualized realized volatility figures for the requested ticker across five lookback windows (10, 20, 30, 60, and 90 days), each representing the annualized standard deviation of daily log returns computed from historical Yahoo Finance closing prices.
Example use cases
Options pricing context check
“Pull the realized volatility for SPY across all lookback windows — I want to compare it against the current implied volatility to see if options are overpriced right now.”
Risk management pre-trade check
“Before I size this NVDA position, can you get me the historical realized volatility across the 30 and 90-day windows so I can calibrate my stop-loss?”
Earnings volatility regime analysis
“MSFT earnings are coming up — what's the annualized realized volatility across the 10, 20, and 30-day lookback windows so I can gauge how jumpy the stock has been recently?”
Technical details
Endpoint
GEThttps://www.x402financialdata.com/volatility/:tickerWhen to prefer
Choose this endpoint when you need backward-looking, historically-grounded volatility for a US equity — especially when comparing realized volatility against implied volatility for options pricing, sizing positions based on historical risk, or building volatility regime models. It covers five lookback windows in a single call at very low cost ($0.005), making it ideal for quantitative screening or agent-driven risk workflows where you need multiple horizons at once.
Side effects
- Invalid or non-existent ticker symbol returns an error or empty result
- Non-US tickers or delisted stocks may not have data available
- Insufficient price history for shorter lookback windows on newly listed stocks
- Payment not processed (x402 payment failure) returns a 402 response
- Yahoo Finance data outage or latency may cause stale or missing closes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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