What each level can do
Both levels see the same platform — the difference is what you can save, trade, and customize. Highlight a level to focus its column.
- Live SPX chart & overlays 1-second, live day
- Historical sessions Most recent completed only
- Historical resolution 30-second samples
- Place trades (practice & live) Sign in to trade
- Live accounts (continuous balance) Sign in to open one
- Strategy builder & results View public strategies you're linked to
- Portfolios View public portfolios you're linked to
- Custom fee schedule & slippage Sign in to customize
- API + WebSocket Public market data only
- Live SPX chart & overlays Live + full history
- Historical sessions Every date, in full
- Historical resolution 1-second
- Place trades (practice & live) Practice & live
- Live accounts (continuous balance) Carries day to day
- Strategy builder & results Build, save, update
- Portfolios Create and manage
- Custom fee schedule & slippage Applied everywhere
- API + WebSocket Full authenticated access
Visitor
Without signing in you can watch the live chart, browse the most recent completed session, read a public strategy or portfolio someone shared with you, and read these docs. Historical market data is shown at a coarser 30-second resolution, and you can't place trades or save anything — sign in when you're ready to trade.
Registered (free account)
Sign up with your email — we send a 6-digit verification code to confirm it's you (no credit card, and a password is optional: you can keep logging in with fresh email codes instead). Registration is one account per inbox: address aliases that deliver to the same mailbox (for Gmail, dots and +suffix variants of the local part) count as the same inbox, and there's a small daily allowance of new sign-ups per network. One account is all you need — it unlocks the full platform:
- Every historical date at 1-second resolution — reconstruct the option chain at any moment of any session.
- The account-less practice sandbox: replay any past trading day with $100,000 and full control of the clock.
- Live accounts with a continuous cash balance that carries day to day, for real-time paper trading.
- Build a strategy and read its backtest over the full history, updated as new sessions arrive — plus portfolios that aggregate several.
- A custom fee schedule and slippage setting applied everywhere you look: order tickets, fills, settlement, and every backtest result.
Fair use
To keep the platform fast for everyone, heavy market-data reads are metered by a daily usage allowance that refills continuously — see Rate limits. Normal interactive use — trading, charting, clicking through strategy results — stays comfortably inside it.
One account, everywhere
The same login works in the web app and against the API: the token returned by POST /auth/sessions is the same kind of session the browser holds. Anything you do over the API — sessions you open, orders you place, strategies you save — shows up in the app instantly, and vice versa.
# one login for the app and the API $ curl -s "https://api.0dtespx.com/auth/sessions" \ -d '{ "email": "[email protected]", "verification_code": "402913" }' { "token": "8a4f3e21d6c9…" }
The browser holds the same kind of token — open a session in either place and it appears in the other.