# ByKaranteli Implied Volatility Index History

> ByKaranteli Implied Volatility Index History is a paid API for AI agents from bykaranteli.com, paid per call via x402, $0.002/call, status down (last checked 2026-10-12).

Returns daily implied volatility index (DVOL) history for BTC and ETH, the crypto equivalent of VIX, going back to 2021.

## Facts

- Endpoint: GET https://bykaranteli.com/api/x402/dvol-history?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bykaranteli-implied-volatility-index-history-eb2ccaf3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SbVPqzVCabW4RXvE6e3IQ

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 bykaranteli-implied-volatility-index-history-eb2ccaf3
```

Example prompt: Pull the daily DVOL implied volatility index history for BTC from January 2023 through December 2023, up to 500 rows.

## When to prefer this

Choose this endpoint when you need a daily time series of implied volatility for BTC or ETH — the crypto equivalent of the VIX — for backtesting, options pricing, volatility regime analysis, or quant research. It covers data back to 2021 and is purpose-built for crypto derivatives workflows, making it preferable over generic market data APIs that lack dedicated DVOL or implied vol index series.

## Known failure modes

- Invalid or unsupported symbol returns empty rows array
- Date range with no data returns rows:[] with count:0
- Exceeding the per-dataset row cap silently truncates to the cap limit
- Malformed date strings in from/to params may cause errors or empty results
- Payment failure via x402 protocol returns 402 status before data is served

## How this service works

Track verified crypto futures signals with live win rate, profit factor, funding data, and liquidation maps. Deterministic, auditable, operator-first.

## Output

A JSON object with ok:true, a dataset label of 'dvol-history', a count of returned rows, and a rows array containing daily implied volatility index readings for the requested symbol(s) with timestamps and DVOL values.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "rows": [],
  "count": 500,
  "dataset": "dvol-history"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bykaranteli-implied-volatility-index-history-eb2ccaf3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bykaranteli.com](https://www.zero.xyz/host/bykaranteli.com/llms.txt)