Market Volatility · Data API

Stock Market Volatility Index

Daily open, high, low and close values of the market's 'fear gauge' since 1990.

Daily history of the CBOE Volatility Index (VIX), which measures expected 30-day volatility of the S&P 500 implied by options prices. Fintech startups, trading bots, risk dashboards and AI finance agents use it to gauge market stress and backtest strategies.

Get API keyView docs

Source: CBOE VIX daily history (Open Knowledge datasets/finance-vix) · ODC-PDDL-1.0 · VIX data from Cboe Global Markets, packaged by the Open Knowledge Foundation datasets project

Endpoints

Every request is authenticated with your X-API-Key and counted against your plan.

  • GET /v1/data/stock-market-volatility-index
  • GET /v1/data/stock-market-volatility-index/search?q=...
  • GET /v1/data/stock-market-volatility-index/{key}

Base path /v1/data/stock-market-volatility-index · full reference in the interactive docs. Also exposed as an MCP tool for AI agents.

Fields

FieldTypeDescription
datedateTrading date
openfloatOpening index value
highfloatIntraday high
lowfloatIntraday low
closefloatClosing index value

What you get

Daily VIX history back to 1990
Open, high, low and close values
Lookup by exact trading date
Range filtering for backtests
Updated from the public datasets repository

FAQ

What does a high VIX mean?
Investors expect large S&P 500 swings; values above 30 typically signal market stress.
Is this intraday data?
No, it is daily open/high/low/close only.

Pricing

Simple, transparent pricing

Start free, upgrade when you need more. All plans include full API access.

Free

$0forever

Get started and explore the API

100 requests/day
  • 100 API requests per day
  • All endpoints included
  • Community support
Get Started
Most popular

Pro

$9/month

For production apps and AI agents

10,000 requests/day
  • 10,000 API requests per day
  • All endpoints included
  • Priority support
  • Usage dashboard
Upgrade to Pro

Enterprise

$49/month

Unlimited access for high-volume use

Unlimited requests
  • Unlimited API requests
  • All endpoints included
  • Priority support
  • Usage dashboard
  • Dedicated support channel
Go Enterprise

Getting Started

Start building in minutes

Register for a free API key, make your first request, and upgrade when you're ready.

1

Register

Create an account to get your API key. It's free — no credit card required.

curl -X POST https://api.aristocles.com.au/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{"email": "you@example.com", "name": "Your Name"}'
2

Make a request

Use your API key in the X-API-Key header to authenticate requests.

curl https://api.aristocles.com.au/v1/data/asx \
  -H "X-API-Key: your_api_key_here"
3

Upgrade

Need more requests? Upgrade to Pro or Enterprise — you'll be redirected to Stripe Checkout.

curl -X POST "https://api.aristocles.com.au/v1/billing/checkout?tier=pro" \
  -H "X-API-Key: your_api_key_here"
4

Check usage

Monitor your daily request count and remaining quota at any time.

curl https://api.aristocles.com.au/v1/usage \
  -H "X-API-Key: your_api_key_here"