Quant Data

Quant Data — market-statistics skills for AI agents

Measured market statistics for index futures and equities, packaged so an AI agent can use them and — more importantly — report them honestly. Installs natively intoClaude Code(plugin),Codex CLI(plugin marketplace) andGemini CLI(extension), all from this one repository.

The honest summary of what you get: measured edges of 52–56%, published together with the places the models fail. There is a section below on exactly that, and it is not buried.

Which Quant Data this is.This project is Quant Data atquantdata.uk(API hostapi.quantdata.uk, MCP endpointhttps://api.quantdata.uk/mcp, registry nameuk.quantdata/quantdata). It is not affiliated with quantdata.us, an unrelated product with a similar name and a different API. Keys are not interchangeable between the two.

/plugin marketplace add celineycn/quantdata-plugin /plugin install quantdata@quantdata

The same repository doubles as a Codex plugin marketplace:

codex plugin marketplace add celineycn/quantdata-plugin codex plugin add quantdata@quantdata

Any other MCP client (Claude Desktop, ChatGPT, Cursor, VS Code, Zed)

The same four endpoints are aremote MCP server, together with an access tool that can email a free API key. Nothing to install — point the client at:

Streamable HTTP. With no key, one anonymous market-tool response is available per source per UTC day as a first look. The agent can then callquantdata_request_free_api_keywith an email address; the freeqd_key is sent only to that inbox, needs no login or card, and gives the four market tools 10 shared successful calls per UTC day. A stdio bridge ships inquantdata/mcp/for clients that can only launch a local command.

The repository is also a Gemini CLI extension.GEMINI.mdcarries the three skill bodies merged into one context file:

gemini extensions install https://github.com/celineycn/quantdata-plugin

Start a new session. You do not invoke a skill by name — just ask:

Did ES=F just break out of its range, and how often did breakouts like this fail?

Is the pullback in ES=F happening on low volume?

Which way is dealer gamma leaning on NVDA?

To check it loaded, ask:"Which Quant Data skills do you have?"

A skill is just a folder with aSKILL.mdin it, so you can also copy them by hand:

mkdir -p ~/.claude/skills cp -R quantdata/skills/* ~/.claude/skills/

Or project-scoped, committed alongside your code, in.claude/skills/.

One anonymous API or MCP call can return a complete first-look response per source per UTC day. For continued evaluation, request a freeqd_key by email:

curl -s -X POST https://api.quantdata.uk/v1/access/free-key \ -H 'Content-Type: application/json' \ -d '{"email":"you@example.com","marketing_opt_in":false,"source":"agent"}'

An MCP-connected agent can callquantdata_request_free_api_keyinstead. The raw key is never returned by the POST or MCP result; it is delivered only to the email address. The free key covers all four endpoints, sharing 10 successful calls per UTC day, and needs no account, password or card.

The permanently free surface is the Max Pain and GEX pages. No key, no account, no card:

https://quantdata.uk/max-pain/nvda https://quantdata.uk/gex/nvda

Max pain (the option strike at which option buyers lose the most in aggregate at expiration), put/call ratio and open interest by expiration, one page per covered US stock or ETF — and a separate GEX page per ticker with net gamma exposure and the zero gamma (flip) level. The site is rebuilt nightly from the latest upstream settlement available, and every page states the open-interest settlement date it uses. Lowercase tickers.https://quantdata.uk/max-painandhttps://quantdata.uk/gexare the coverage lists.

To check the research before paying for it, readhttps://quantdata.uk/methodology— an ordinary web page, free, no key. It publishes the fact-check of the trading literature's famous probability claims against 3,946 S&P 500 futures trading days (2010–2026). The claim that one of the session's extremes forms within the first 90 minutes is usually taught as 90%; the measured figure is 81.2%. The pattern holds across every claim tested — directionally right, inflated by roughly 7–10 percentage points.

One plan:$149/month, first 3 days free.Checkout is self-serve athttps://quantdata.uk/pricing, and a card is collected up front. Checkout with the same email used for the free key upgrades that key in place, so an agent does not need a new secret. Cancel any time in the Stripe customer portal (https://billing.stripe.com/p/login/3cIfZhgcHfOb5IE7PD9Ve00), signing in with the checkout email.

The fact-check verdicts live on[https://quantdata.uk/methodologyas a static table — a web page to read, free and needing no key, not an endpoint to call.

Keys bought under the older two-product pricing keep working at their original price.

An AI agent can request the free key, but it cannot buy the paid plan for you.Card authentication (3-D Secure) requires the cardholder, so after the free allowance is reached the skills hand the checkout link to a person and stop.

Copy theqd_key from its delivery email into a secret store. Never paste a key intoSKILL.md— those files are meant to be copied, committed and shared.

# ~/.zshrc (macOS default) or ~/.bashrc export QUANTDATA_API_KEY="qd_your_key_here"

Then open a new terminal, or runsource ~/.zshrc. Check it:

curl -s -H "X-API-Key: $QUANTDATA_API_KEY" https://api.quantdata.uk/v1/brooks/SPY

For an agent with no shell, the key goes wherever that tool stores secrets — an Actions authentication field, a credential entry, a.envloaded by your runtime. Same rule: a secret store, not a shared file.