Market data APIs for AI agents: free tiers & pricing compared

Published free-tier limits and entry prices of the major market-data APIs, each linked to the vendor's pricing page. Data from our automated check on 2026-10-29; prices as published by each vendor.

API	Free tier	Paid from	Plans (published)	Status	Source
Alpha Vantage API	25 requests/day	$49.99/mo	Premium plans $49.99–$249.99/mo (75–1,200 req/min).	✓ Verified	pricing page
Massive (formerly Polygon.io) API	Stocks Basic: 5 calls/min, EOD, 2 yrs history	$29/mo	Starter $29, Developer $79, Advanced $199 (real-time) per month; individual non-pro use.	✓ Verified	pricing page
Financial Modeling Prep API	250 calls/day, EOD	$29/mo	Starter $29, Premium $69, Ultimate $139 per month ($19/$49/$99 billed annually).	✓ Verified	pricing page
Finnhub API	60 calls/min, US real-time quotes	$50/mo per market (fundamentals)	Fundamental-1 $50/mo/market, Fundamental-2 $200/mo/market (published). Other plan prices not verified.	✓ Verified	pricing page
Twelve Data API	8 credits/min, 800/day	$29/mo	Grow $29–79, Pro $99–229, Ultra $329–999 per month.	✓ Verified	pricing page
EODHD API	20 calls/day, 1 yr EOD	$19.99/mo	EOD $19.99, EOD+Intraday $29.99, Fundamentals $59.99, All-In-One $99.99 per month.	✓ Verified	pricing page
Alpaca Market Data API	Basic: real-time IEX, 200 calls/min	$99/mo	Algo Trader Plus $99/mo: all US exchanges real-time, OPRA options.	✓ Verified	pricing page
CoinGecko API	Demo: 10,000 credits/mo, 100 calls/min	$35/mo	Basic $35/mo ($29 annual), Analyst $129/mo.	✓ Verified	pricing page

Ordering is by GitHub stars, not a recommendation. Not investment advice.

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