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Choose the smallest product that answers your question. Start with a free API key: enter an email address, receive a qd_ key in that inbox, and use 10 successful calls per UTC day across Brooks, Weis, Max Pain and Gamma. No login or card. Brooks-only access is $9.90 a month with no trial; the full API is $149 a month, with the first 3 days free after adding a card. The Max Pain and GEX static web pages remain free forever, as do Methodology and the guides. Those pages need no email or key.

Brooks for AI

$9.90 per month

Starts immediately · no trial · cancel any time

Built for the short-video workflow: pay once, copy a personalized analyst prompt, then ask supported markets in plain English from ChatGPT Work Desktop or Claude Cowork / Claude Code. Standard web and mobile chat cannot attach the private API header by themselves.

  • GET /v1/brooks/{symbol} Rolling events, measured reference rates, day type, shape, dated window status, and honest coverage notes.
  • POST /v1/brooks/backtest Run the same event definitions over your own OHLCV bars.

Buy Brooks only

Checkout is on Stripe. The success page and a best-effort backup email contain the private key and personalized prompt. Billing cancellation and marketing-email unsubscribe are separate controls.

Quant Data API

$149 per month

First 3 days free — card up front, nothing charged during the trial

One key covers all four interfaces. This remains the better fit when you need Brooks structure beside Weis volume analysis or the two options-derived reads. The strongest published cross-method result — day-type context gating a volume event — remains on the methodology page.

  • GET /v1/brooks/{symbol} What just happened structurally? The classical Brooks events — range breakouts, follow-through, range position, climactic spikes — each with the outcome rate we measured for it, pre-registered, and a calibrated per-event estimate for breakouts. Live around the clock on 24-hour instruments, including the Asia-close-to-US-open gap. Every read also carries the calibrated five-class day-type distribution for the day session, and a plain arithmetic description of the shape the last stretch of bars printed. US stocks and ETFs, futures (ES=F), Hong Kong (3690.HK), China A-shares (600519), spot FX (EURUSD), crypto (BTC-USD).
  • GET /v1/weis/{symbol} Is there volume behind this move? Price grouped into volume waves, plus five named volume-price events — each returned with the win rate we measured for it on sixteen years of S&P 500 futures data. Anything with real exchange volume. Spot FX has none — use CME currency futures (6E=F).
  • GET /v1/maxpain/{symbol} Where would the most options expire worthless? The max pain strike for every expiration inside 45 days, from open interest alone. Pure arithmetic: no pricing model, no volatility assumption — anyone with the same chain gets the same number. US listed stocks and ETFs only. Index options (SPX, NDX, VIX) return 400 — use SPY, QQQ, IWM.
  • GET /v1/gamma/{symbol} Which way does estimated dealer hedging lean? Estimated dealer gamma exposure: net and gross GEX, the zero gamma (flip) level and the heaviest strikes. Unlike max pain this is a Black-Scholes estimate, and the response says so. US listed stocks and ETFs only, same rule as /v1/maxpain.

Not ready to pay? Get a free API key by email for 10 successful responses per UTC day, shared across all four routes. With no key at all, one anonymous source gets 1 first-look response per UTC day. Product updates are a separate, default-off choice; receiving the key-delivery email is not marketing consent.

Buy full API access

Cancel inside the trial and you are not billed at all. Cancelling later is self-serve, in the Stripe customer portal.

Free web pages No key

$0 forever

No account, no email, no card

These are ordinary pages on quantdata.uk, not API endpoints. The options pages are rebuilt nightly from the latest upstream settlement available, while the methodology and guides explain how to read the results. Every ticker page states the settlement date of the chain it uses; “nightly” describes the rebuild schedule, not live data.

  • /max-pain/{ticker} Max pain by expiration, put/call ratio, call and put walls and open-interest distribution — one page per covered US stock or ETF.
  • /gex/{ticker} Net and gross gamma exposure, the zero gamma level and the heaviest strikes, for the same covered tickers.
  • /methodology How every number was measured — including the seven fact-check verdicts and the tests that failed.
  • /guides + /learn Plain-English explanations of max pain, GEX, day types and how to read a probability honestly.

Open the free pages

The free static pages and the paid Max Pain and Gamma APIs use the same settled open interest. The paid APIs add broader liquid-US coverage, agent-readable JSON and computation on request. They are included in the same plan as Brooks and Weis.

How buying works

  1. Choose Brooks-only or the full API, then check out on Stripe. If you already have a free key, use the same email address and that key is upgraded in place. Card details go to Stripe; we never see or store them. A billing address is collected because we have to record where the buyer is.
  2. Your access changes immediately. A free key keeps the same qd_ value when the checkout email matches. If there was no free key for that email, a new key appears on the page Stripe sends you back to.
  3. The schedules differ. Brooks-only is charged $9.90 when checkout succeeds and renews monthly. The full API charges nothing for 3 days; after that it is $149 a month unless you cancel.
  4. Cancelling is self-serve, in the Stripe customer portal — sign in with the email you used at checkout. The key keeps working until the end of the period you already paid for, then stops answering.

An AI agent can request the free key, but it cannot complete checkout. With your email address, an agent can call POST /v1/access/free-key; the raw key is sent only to that inbox. Card authentication (3-D Secure) still requires the cardholder, so when the free allowance is not enough the agent hands you the checkout link rather than trying to pay.

What paid access includes

Included

  • Brooks-only includes the live Brooks read and Brooks backtest. The full plan includes Brooks, Weis, Max Pain and Gamma.
  • Coverage as listed per endpoint above: the Brooks events endpoint takes US stocks and ETFs, futures, Hong Kong, China A-shares, spot FX and crypto; the volume endpoint takes anything with real exchange volume (spot FX has none — use CME currency futures such as 6E=F); the two options endpoints take US stocks and ETFs with a liquid listed options chain — thin chains return a clear 404 — which reaches far beyond the tickers on the free pages.
  • Unmetered normal use — no per-call charge and no credit balance to top up. There is an anti-abuse cap so one key cannot be pointed at a scraper; ordinary research, backtesting and agent use will never reach it.
  • The published research behind the numbers, including the parts that failed. See Methodology.
  • Email support from the person who wrote the code.

Not included

  • No realtime tick feed. Intraday reads are built from delayed 5-minute bars, and the options endpoints read open interest that settles once a day — they cannot update intraday.
  • No raw option chains. The options endpoints return derived metrics (max pain, walls, GEX); we do not redistribute quotes.
  • No index options. SPX, NDX, RUT and VIX return a clear 400 — our price source has no index level and we will not fabricate one from an ETF. Use SPY, QQQ or IWM instead.
  • No order execution, no broker connection, no portfolio tracking.
  • No advice, no signals, no price targets, no "what should I buy". The API returns probabilities and measured base rates, and that is deliberately all it returns.
  • No per-customer output. Everyone on the plan gets the identical payload for the identical request — that is a deliberate design constraint, not a missing feature.
  • No guarantee of profit, and no historical performance claim beyond the tests written up in Methodology.

If you already have a key

Until 26 July 2026 this service was sold as separate per-product subscriptions. Keys bought then keep working at the price you agreed, for as long as you keep them — nothing was migrated, re-billed or expired. If your old key hits a 403 on an endpoint it never covered, email quantdata@quantdata.uk — you get moved across by hand rather than paying twice.

Before you pay, read the limits. The measured edges here are 52–56%, which is what a genuine edge looks like in a market this liquid. The Brooks reference rates were measured on S&P 500 futures, so reads on other symbols are descriptive context, not validated claims about that symbol. Nothing we found transfers to gold, Bitcoin or Ethereum. Max pain is arithmetic, but gamma is an estimate built on a public convention, and no hit rate has been measured for either level. If those sentences are disappointing, the honest advice is not to buy — start with the free static Max Pain pages and Learn instead.

Ready to choose? Start with Brooks for $9.90/month, or use the full API for $149/month after its 3-day trial.

Buy Brooks only Buy full API access