Free APIs
Free Health APIs
| API | Free tier | Auth | Docs |
|---|---|---|---|
| openFDA Drug, device and food adverse events and recalls Catch: Free API key raises the daily limit | Free; no key: 240 requests/min and 1,000/day per IP | No key | docs |
| RxNav / RxNorm API Drug names, classes and interactions Catch: Terms of service apply; rate limit per IP | Free, no key | No key | docs |
| ClinicalTrials.gov API Clinical study records Catch: Rate limited per IP | Free, no key | No key | docs |
| NCBI E-utilities PubMed, GenBank and other NCBI databases Catch: Throttled per IP without key | Free; higher rate limit with a free API key | No key | docs |
| NPPES NPI Registry API US healthcare provider lookup Catch: US providers only | Free, no key | No key | docs |
| WHO Global Health Observatory API Global health statistics via OData Catch: OData format | Free, no key | No key | docs |
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.
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