Pricing

Two paid APIs at $30 a month each, $50 for both, and the Max Pain pages free forever. There is no checkout on this site — you email, we reply. That is the whole system, and the rest of this page explains exactly how it goes.

Brooks Daily Bias API

$30 per month

Day-type probabilities for the session so far, the most similar historical sessions since 2010, and the fact-checked claims database.

  • GET /v1/read/{symbol}
  • GET /v1/match/{symbol}
  • GET /v1/claims

Request this key

More about what it returns →

Weis Wave API

$30 per month

Volume waves on the current chart plus five named volume-and-price events, each returned with the win rate we measured for it.

  • GET /v1/weis/{symbol}

Request this key

More about what it returns →

Both APIs

$50 per month

One key, all four endpoints. This is the combination the research is strongest on: filtering a volume event through the day-type read is the only thing we measured that replicated on markets it was never fitted to.

  • GET /v1/read/{symbol}
  • GET /v1/match/{symbol}
  • GET /v1/claims
  • GET /v1/weis/{symbol}

Request this key

More about what it returns →

Max Pain Free

$0 forever

Options max pain, put/call ratio, call and put walls, open-interest distribution and gamma exposure — one page per ticker, refreshed nightly. No key, no account, no email.

Open Max Pain

Free because it is a static page. There is nothing to meter.

How buying actually works right now

Being plain about this: billing is manual. There is no self-serve checkout, no dashboard and no subscription widget, because Quant Data is one person and building a billing system before there are enough customers to need one would be a waste of everybody's time.

  1. You email quantdata@agentmail.to saying which plan you want and one sentence on what you are building or studying. The plan buttons above pre-fill all of that.
  2. Celine replies with a Stripe payment link, by hand, for the plan you asked for. This is normally within a day. If it has been longer, the email got lost — send it again.
  3. You pay the first month. Stripe handles the card; we never see or store card details.
  4. Your key arrives by email. It starts with qd_. Send it on every request as the X-API-Key header, and paste the system-prompt block from the home page into your agent so it knows what to do with it.

When this gets busy enough to justify it, self-serve checkout will replace step 2. Existing keys will keep working; nobody will be forced to re-buy.

What a key includes

Included

  • Unmetered normal use — there is 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.
  • Every endpoint in your plan, on every symbol we support: US tickers, Hong Kong (3690.HK), China A-shares (600519) and futures (ES=F).
  • 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. Reads are built from delayed intraday bars, not a market-data subscription.
  • No raw option chains. Max Pain publishes derived metrics; we do not redistribute quotes.
  • 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 guarantee of profit, and no historical performance claim beyond the tests written up in Methodology.

Renewal, expiry and cancelling

A key is valid for one month from the day it is issued. Near the end of the month you get a reminder email with a link for the next one; pay it and the same key keeps working, so nothing in your agent config has to change. Miss it and the key simply stops answering — there is no automatic charge, because there is no stored payment method on our side.

Cancelling is not doing anything. Either side can walk away at the end of any month. If you paid for a month you could not use because the service was broken, say so and you get it back.

Keys are personal. Please do not resell one or share it across an organisation — if you need several seats, email and we will work something out.

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 day-type model is trained on S&P 500 futures, so single-stock reads are out-of-distribution and descriptive. Nothing we found transfers to gold, Bitcoin or Ethereum. If those sentences are disappointing, the honest advice is not to buy — start with the free Max Pain pages and Learn instead.

Ready for a key?

Say which plan you want and one sentence about what you are doing with it. You get a Stripe link back, then the key.

Email quantdata@agentmail.to Read the methodology first

No signup form, no card on this site. Keys are issued by hand, one at a time. Max Pain pages stay free and need no key at all.

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