A stock market data API for people and AI agents

Quantustik is a market data service for the S&P 500: prices, fundamentals, SEC filings, insider and Congress trades, macro indicators and market conditions, as a dashboard, a REST API and an MCP server.

This page sells API access. The full endpoint reference and every MCP client install snippet live at /developers: that page is the documentation, this one is the storefront.

Try it with no API key

The anonymous lane works immediately, no signup, no key:

curl https://quantustik.com/api/v1/market/fear-greed

Every response carries a source and a disclaimer field so you can verify what you are reading without a second request.

How do I connect an AI agent over MCP?

The hosted endpoint is https://quantustik.com/mcp (streamable-HTTP, no API key required to start); the manifest is at https://quantustik.com/.well-known/mcp.json.

claude mcp add --transport http quantustik https://quantustik.com/mcp

What are the API rate limits?

Same data, you buy capacity: every tier gets identical data, and paying only raises how many requests your own code may make.

TierDaily cap
Anonymous (no key)2,000 / day
Free API key5,000 / day
Plus (paid)15,000 / day
Premium (paid)50,000 / day

How much does the API cost?

$49/mo or $408/yr (two months free) for the API & Agents plan. This price is deliberately low: an underpriced developer API is not a bargain, it is a durability signal. A developer choosing what to build on reads a rock-bottom price as a promise the service will still be running in a year.

Frequently asked questions

How do I try the stock market API with no API key?
Run curl https://quantustik.com/api/v1/tickers, the anonymous lane works immediately, no signup and no key. Every response carries source and disclaimer fields so you can verify what you're reading without a second request.
What is the difference between /stock-market-api and /developers?
This page is the storefront: quickstart, honest quota tiers, one pricing row. /developers is the reference documentation: the full endpoint list and every MCP client install snippet. Both are real, canonical pages; neither redirects to the other.
Is the Quantustik API investment advice?
No. Quantustik publishes market data and educational research. Every response carries an explicit disclaimer.

Where can I verify these claims?

Educational research only — not investment advice.