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Portfolio Stats – Annualized Volatility
x402
Portfolio Stats – Annualized Volatility is a paid API for AI agents from portfolio-stats.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Computes annualized volatility (sample standard deviation of returns) from a supplied price or return series, with optional annualization period.
Price / call$0.02
Success—
StatusUnknown
How this service works
Annualized volatility (sample standard deviation of returns) from a price or return series you supply. Not advice.
Output
Returns annualized volatility as both a decimal and percentage, period volatility, mean return per period, observation count, periods-per-year used, and an input kind label. Also includes a summary, disclaimer, and educational-only notice clarifying the result is not investment advice.
Example use cases
Daily stock volatility estimate
“I have a series of daily closing prices for a stock — 150, 152, 149, 153, 155, 151, 154, 157, 156, 158. Can you compute the annualized volatility using 252 trading days per year?”
Monthly fund return risk assessment
“Here are monthly returns for a fund in decimal form, oldest first: 0.02, -0.01, 0.03, 0.015, -0.005, 0.025, 0.01, -0.02, 0.03, 0.005, 0.02, -0.01. What's the annualized volatility using 12 periods per year?”
Weekly ETF risk comparison
“I want to compare volatility of two ETFs — for the first one, here are weekly prices oldest to newest: 200, 203, 198, 205, 207, 202, 210. Calculate annualized volatility using 52 weeks per year.”
Technical details
Endpoint
GEThttps://portfolio-stats.x402tookit.com/volatility?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, stateless computation of annualized historical volatility from a raw price or return series you already have in hand. It is ideal for portfolio risk dashboards, agent-driven quantitative analysis, or any workflow that requires a quick volatility figure without connecting to market data APIs. Prefer it over general-purpose statistics tools because it is finance-domain-specific and handles both price-to-return conversion and annualization automatically.
Side effects
- Missing both prices and returns parameters — endpoint requires one of the two
- Too many data points supplied (limit is 1000)
- Malformed price/return array (non-numeric values or invalid JSON)
- Fewer than 2 data points provided (cannot compute standard deviation)
- Invalid periodsPerYear value causing annualization error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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