# Financial Data x402 — Realized Volatility

> Financial Data x402 — Realized Volatility is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

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

## Facts

- Endpoint: GET https://x402financialdata.com/volatility/%7Bticker%7D?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/financial-data-x402-realized-volatility-cff5347b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sXzPKgnNCl3UeKpp-5tyj

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 financial-data-x402-realized-volatility-cff5347b
```

Example prompt: What's the realized volatility for AAPL right now — give me the 10-day, 30-day, and 90-day annualized numbers so I can see how short-term vol compares to the longer-term trend?

## When to prefer this

Choose this endpoint when you need backward-looking, realized (historical) volatility derived from actual price returns — not options-implied volatility. Ideal for quantitative risk models, options pricing comparisons, portfolio risk dashboards, or any workflow requiring multi-window vol term structure. Preferred when you want pay-per-call pricing with no API key or subscription setup, paying micro-amounts in USDC via x402.

## Known failure modes

- Ticker not found or invalid symbol — likely returns an error or empty result
- Insufficient price history for a window (e.g. recent IPO) — that window returns null rather than a value
- Payment not received or USDC payment rejected — x402 protocol returns 402 Payment Required
- Network or upstream data provider outage — may return 5xx error
- Ticker passed as wrong case or with exchange suffix — may not resolve correctly

## 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 containing the ticker, the as-of date, and realized volatility expressed as an annualized percentage for five rolling windows: 10-day, 20-day, 30-day, 60-day, and 90-day. Windows with insufficient history (e.g. recent IPOs) are returned as null. Volatility is calculated as the annualized standard deviation of daily log returns (close-to-close), 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/financial-data-x402-realized-volatility-cff5347b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402financialdata.com](https://www.zero.xyz/host/x402financialdata.com/llms.txt)