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Free APIs

Free Health APIs

Drug, trial and public-health datasets. 6 APIs with a usable free tier, checked on their official docs on 2026-10-08.
6
openFDA

Drug, device and food adverse events and recalls

Free tier
Free; no key: 240 requests/min and 1,000/day per IP
Auth
No key
Docs
docs

Catch: Free API key raises the daily limit

source

RxNav / RxNorm API

Drug names, classes and interactions

Free tier
Free, no key
Auth
No key
Docs
docs

Catch: Terms of service apply; rate limit per IP

source

ClinicalTrials.gov API

Clinical study records

Free tier
Free, no key
Auth
No key
Docs
docs

Catch: Rate limited per IP

NCBI E-utilities

PubMed, GenBank and other NCBI databases

Free tier
Free; higher rate limit with a free API key
Auth
No key
Docs
docs

Catch: Throttled per IP without key

NPPES NPI Registry API

US healthcare provider lookup

Free tier
Free, no key
Auth
No key
Docs
docs

Catch: US providers only

source

WHO Global Health Observatory API

Global health statistics via OData

Free tier
Free, no key
Auth
No key
Docs
docs

Catch: OData format

source

FAQ

What is the best free health API?+

openFDA, RxNav / RxNorm API, ClinicalTrials.gov API are good places to start. Compare the free tiers and catches in the table; they differ mostly in limits and whether commercial use is allowed.

Is there a health API without an API key?+

Yes: openFDA, RxNav / RxNorm API, ClinicalTrials.gov API, NCBI E-utilities, NPPES NPI Registry API work without a key.

More free APIs: Weather · Maps & geocoding · Finance & crypto · Currency exchange · AI & ML · Email & messaging · IP & geolocation · News & social · Sports · Movies, TV & anime · Music · Books & reference · Space & science · Government & open data · Translation & language · Images & media · Fake data & testing · Food & recipes · Transportation · Developer tools · Security · Games & fun