# Stock Realized Volatility

> Stock Realized Volatility is a paid API for AI agents from x402-stock-indicators.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).

Returns annualized realized (historical) volatility for a stock ticker across multiple lookback windows (10d, 20d, 30d, 60d, 90d)

## Facts

- Endpoint: GET https://x402-stock-indicators.vercel.app/volatility/%7Bticker%7D?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stock-realized-volatility-ff9ecd67
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Mhz6I9-7H97mTCPClacsS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability stock-realized-volatility-ff9ecd67
```

Example prompt: What's the realized volatility for AAPL right now — give me the annualized numbers across the 10, 20, 30, 60, and 90-day windows.

## When to prefer this

Choose this endpoint when you need backward-looking, realized historical volatility (annualized standard deviation of daily log returns) across multiple time horizons for a US-listed stock, without needing an API key or subscription — particularly useful in pay-per-call agentic workflows using x402/USDC micropayments. Prefer this over options-implied volatility sources when you want a pure price-history-based risk measure. Use alternatives if you need implied volatility from options markets or intraday volatility data.

## Known failure modes

- Invalid or unknown ticker symbol — returns error or empty data
- Insufficient price history for a given window (e.g. recent IPO) — that window's value is null
- Payment failure via x402 — HTTP 402 returned if USDC payment not completed
- Network or data source outage — endpoint may be temporarily unavailable
- Delisted or OTC tickers may not be supported

## How this service works

Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.

## Output

A JSON object with the ticker symbol, the as-of date, and annualized realized volatility percentages (close-to-close log returns, annualized) for five lookback windows: 10d, 20d, 30d, 60d, and 90d. Any window where insufficient price history exists (e.g. recent IPO) is returned as null. Also includes a note clarifying this is backward-looking realized volatility, not options-implied volatility.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Annualized standard deviation of daily log returns (close-to-close), not options-implied volatility -- a backward-looking realized measure. A window is null if there isn't enough history to fill it (e.g. a recent IPO's 90d window).",
  "as_of": "2026-07-31",
  "ticker": "AAPL",
  "realized_volatility_annualized_pct": {
   "10d": 46.07,
   "20d": 37.33,
   "30d": 40.46,
   "60d": 32.32,
   "90d": 29.96
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stock-realized-volatility-ff9ecd67/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-stock-indicators.vercel.app](https://www.zero.xyz/host/x402-stock-indicators.vercel.app/llms.txt)