Terms

Using this site or the API means you accept what is below. It is written to be read, not to be skipped.

1. What this is

Quant Data provides educational analytics and developer tooling: probability distributions, historical statistics, and derived options metrics. It is a description of data, not a recommendation about what to do with it.

2. Not investment advice

Nothing on this site or returned by the API is investment advice, financial advice, a solicitation, an offer, a recommendation to buy or sell any instrument, or a price forecast. It is not personalised to your circumstances, objectives or risk tolerance, and it does not take them into account. We are not a licensed financial adviser, broker, or dealer, and we do not manage anyone's money. If you want advice, get it from someone regulated to give it.

Every trading decision you make is yours alone. Trading and investing carry a real risk of loss, including loss exceeding your deposit in leveraged products. Past measurements do not predict future results.

3. No warranty

The service is provided "as is" and "as available", with no warranty of any kind, express or implied, including fitness for a particular purpose, accuracy, or uninterrupted availability.

Specifically and without pretending otherwise: the data may be delayed, incomplete, or wrong. It comes from third-party sources that can fail or revise. Model outputs are statistical estimates that will be incorrect a meaningful share of the time, and the published accuracy figures are historical measurements, not guarantees. The service may be down, changed, or discontinued.

4. Liability

To the fullest extent permitted by law, we are not liable for any trading loss, lost profit, lost opportunity, or any indirect or consequential damage arising from use of this site, the API, or anything derived from them. Where liability cannot be excluded, it is limited to the fees you paid us in the three months before the claim arose. Nothing here excludes liability for fraud or for anything else that cannot lawfully be excluded.

5. Your key

• A key is personal to you or to your single organisation. Do not resell it, sublicense it, share it publicly, or embed it in a distributed client where others can extract it.
• Keep it secret. Requests made with your key are treated as yours. Tell us immediately if it leaks and we will rotate it.
• Free-key limit. One free key covers all four endpoints, which share 10 successful calls per UTC day. The counter resets at 00:00 UTC. Duplicate requests for the same email reuse the same key; creating extra addresses to evade the limit is abuse.
• Paid fair use. Both paid products remove the daily evaluation limit for the endpoints they include. They remain subject to a high anti-abuse cap. Systematic bulk extraction of the dataset, or reselling the output as your own data feed, is not permitted.
• We can suspend a key for abuse, non-payment, or use that endangers the service. Where it is not urgent, we will tell you first.

6. Free access, payment and cancellation

You can request a free qd_ key by providing an email address. No account, password, card or browser GUI is required. The raw key is sent only to that email address and is not returned in the request response or placed in a URL. An AI agent may submit the request only with an address supplied by the email owner; it must not invent one.

Product-update email is optional and separate from key delivery. The marketing_opt_in choice defaults to false. Declining it does not affect the free key or paid service, and the key-delivery message itself is a service email, not consent to marketing. An affirmative choice only records a pending request. The recipient must reply SUBSCRIBE to the key-delivery email before any marketing updates begin, so a third party cannot subscribe an inbox they do not control. A recipient can withdraw that consent at any time by replying UNSUBSCRIBE or contacting us. Marketing-email unsubscribe does not cancel a paid subscription; paid cancellation uses the Stripe portal.

There are two paid products, both billed in US dollars. Brooks-only access is $9.90 a month, starts immediately, has no free trial, and covers the Brooks read and Brooks backtest. Full API access is $149 a month, covers Brooks, Weis, Max Pain and Gamma, and includes a 3-day free trial after adding a card. Checkout runs on Stripe and has to be finished by the cardholder — card authentication cannot be delegated to an agent. When checkout uses the same email address as a free key, that key is upgraded in place with the entitlement purchased.

Brooks-only renews monthly from the checkout date. Full API access renews monthly after its trial. You can cancel either subscription yourself at any time in the Stripe customer portal, signing in with the email you used at checkout: no email to us, no notice period, no penalty. Cancel the full plan during its trial and you are never charged. Cancel a paid period later and the key keeps working until the end of the month already paid for, then stops. We can also end the arrangement at the end of any month, for any reason, with no penalty. If the service was materially broken during a month you paid for, ask and you get that month back.

Some of the service costs nothing and sits outside all of this: for example, the Max Pain and GEX pages need no key, no account and no payment, and the same goes for the guides and the fact-check table on Methodology — pages anyone can read. Those static pages are the permanently free product surface. Brooks is available either by itself or as part of the full API product; Weis, Max Pain and Gamma require the full product. A caller with no key gets 1 successful first-look response per source per UTC day. The free email key raises that to 10 successful responses per UTC day across all four endpoints. Neither is a right to bulk extraction or to evade the stated limits.

Keys bought before this plan existed. A key sold under the earlier per-product pricing keeps working and stays on the price and terms it was bought at. If you hold one of those and want the product it does not cover, email us and we will move you across by hand rather than charge you twice.

7. Third parties and content

Quant Data is independent research and is not affiliated with, endorsed by, or connected to Al Brooks, David Weis, Thomas Bulkowski, any exchange, broker or data vendor. Those names are used only to identify the published ideas being tested and measured, which is commentary and research.

We publish derived metrics computed by us. We do not redistribute raw market quotes or full option chains, and you should not attempt to reconstruct them from our output.

Text, figures and code on this site belong to Quant Data. You may quote our published statistics with attribution and a link. You may use API output freely inside your own analysis, research, trading and applications. You may not republish the datasets themselves as a competing feed.

8. Changes

Endpoints may change as the research does. Material operational, security or breaking-change notices may be emailed to affected key holders; those necessary service messages are not product marketing. These terms may be updated; the date below tells you when, and continuing to use the service after a change means accepting it.

9. Law

Quant Data is run by an individual based in Hong Kong, and payments are received there. These terms are governed by the laws of Hong Kong, and the Hong Kong courts have jurisdiction. If you are a consumer, this does not remove any protection you have under the mandatory law of your own country of residence.

10. Contact

quantdata@quantdata.uk for anything, including disputes. Talking to us first is faster than everything else.

Last updated 11 August 2026.