Market data & charts
Live and historical SPX/VIX data, option chains, and overlays.
0DTESPX.com is backed by historical and live market data for SPX and VIX, plus full option-chain snapshots (bid, ask, and delta per strike). You can explore it in the app's charts or pull it through the market data API.
What's available
- Index prices — SPX and VIX through the session.
- Expected move and related series — a sense of how big a move the market expects.
- Option-chain snapshots — every strike's calls and puts at a point in time, with bids, asks, and full Greeks.
- Available strikes for any session.
Historical coverage spans hundreds of past trading days.
Resolution by access level
Market data is delivered at a sampling rate that depends on whether you're signed in:
| Access level | Resolution |
|---|---|
| Visitor (no account) | 30-second |
| Registered (free account) | 1-second |
Today's in-progress session is the exception: it streams at 1-second resolution for everyone until it closes. Visitors can access the most recent completed session; registered accounts can access every historical date.
Live charts
The live chart shows the real-time SPX price with configurable overlays — expected move, VIX, total extrinsic value (the time premium summed across the whole chain), and out-of-the-money bids (the bid prices of all OTM options, summed). The two chain-wide totals decay toward zero into the close, which makes them a useful at-a-glance gauge of how much premium is left in the day. No account is needed to watch the chart, though signing in unlocks finer resolution and more history.
Historical charts
For any past session, you can view the index price path and pull up the option chain at any moment in the day, with delta recomputed for that timestamp. This is the same data the trading simulator replays.
Real-time streams
Live market data is also available as a push stream over WebSocket — a 1-second aggregate feed and the latest option-chain snapshot. This is what keeps the live trading screen current tick by tick. If you're building an integration, see the WebSocket API.
Fair-use rate limits
Registered accounts have full access to the historical archive, so market-data requests draw against a generous daily usage budget to keep access fair and prevent bulk scraping. Visitor traffic isn't rate-limited because it can only reach the most recent session. Details are in the rate limits reference.