Get Volatility Index History
GET/v1/cryptodata/volatility/index/history
Daily CVI + vol-stress history, up to a year (**Pro Plus**). One point per UTC day in ``[today - days, today]``. From 2026-08-24 values come from each day's live archived snapshot. Earlier days are reconstructed from daily klines with the live formula and carry ``backfilled: true`` — CVI was only archived from 2026-07-23, and until 2026-08-24 the live universe still counted delisted exchange pairs with frozen prices, which roughly doubled the published index. Reconstructed days use today's coin universe. Today appears once the 20:00 UTC snapshot is built. ``composite_score`` is the number ``/volatility/regime/score`` serves live, captured once a day.
Price
$0.01/ callEdge cache
300s
Uptime 24h
100.00%
p95
529ms
Parameters
| Name | In | Type | Description |
|---|---|---|---|
| days | query | integer = 90 |
Code
# 1. No key, no payment: the gateway answers 402 with the price
curl -i "https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history"
# 2. Pay: retry with a signed x402 payment (any x402 client builds this header)
curl "https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history" -H "PAYMENT-SIGNATURE: $X402_PAYMENT"// npm i @x402/fetch @x402/core @x402/evm viem
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";
const client = x402Client.fromConfig({ schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(PRIVATE_KEY)) }] });
const pay = wrapFetchWithPayment(fetch, client);
const data = await (await pay("https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history")).json();
console.log(data);# pip install x402 eth-account requests
from eth_account import Account
from x402.clients.requests import x402_requests
session = x402_requests(Account.from_key(PRIVATE_KEY))
print(session.get("https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history").json())curl "https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history" -H "X-API-Key: $RTAPI_KEY"Frequently asked questions
How do I get get volatility index history from CryptoDataAPI?
Send GET https://api.realtimeapi.ai/v1/cryptodata/volatility/index/history. Pay $0.01 per request with x402, or send an X-API-Key header.
What does GET /volatility/index/history cost?
$0.01 per successful request in USDC on Base. Failed requests are never charged.
Can I call this endpoint from an MCP client?
Yes. Connect any MCP client to the RealtimeAPI server and use call_feed with this endpoint's URL, or get_quote to check the price first.