Finance — entry 001 of 47
Marketstack
Marketstack is an APILayer product providing real-time, intraday, and historical end-of-day stock data across dozens of global exchanges, returned as JSON over a simple API-key-authenticated REST endpoint. Its free plan allows 100 requests/month with 1 year of history; paid tiers range from $9.99/month (Basic, 10,000 requests, intraday US data, 10-year history) to $149.99/month (Business, 500,000 requests plus financials and ratings), with an Enterprise tier above that.
GreatAPIs Score
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<a href="https://greatapis.com/api/marketstack/"><img src="https://greatapis.com/badge/marketstack.svg" alt="Scored 75 on greatapis.com"></a>Auth quickstart
- Get a key at the provider
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
100 requests/month on Free plan; 10,000/month on Basic ($9.99/mo); 100,000/month on Professional ($49.99/mo); 500,000/month on Business ($149.99/mo); custom volume on Enterprise