United States National Library of Medicine · Rate Limits

United States National Library Of Medicine Rate Limits

Machine-readable rate limit definitions for the United States National Library of Medicine API surface. Captures per-tier quotas, burst behavior, response signaling, and recovery semantics. Defaults are scaffold values to be replaced with published provider limits.

United States National Library Of Medicine Rate Limits is the machine-readable rate-limit profile for United States National Library of Medicine on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 5 rate-limit definitions, across the free, professional, and enterprise tiers, measuring requests_per_minute and requests_per_month.

The profile also includes 4 backoff/retry policies defined and response codes documented for throttled, quotaExceeded, and serviceUnavailable.

Tagged areas include Federal Government, Biomedical Research, Healthcare, Genomics, and Literature.

5 Limits Throttle: 429 Quota: 429
Federal GovernmentBiomedical ResearchHealthcareGenomicsLiteratureRate LimitingQuotasThrottling

Limits

Free Tier Default api-key
requests_per_minute · minute
10
Free Tier Monthly Quota api-key
requests_per_month · month
1000
Professional Tier Default api-key
requests_per_minute · minute
100
Professional Tier Monthly Quota api-key
requests_per_month · month
100000
Enterprise Negotiated Limit contract
requests_per_minute · minute
1000

Policies

Backoff Strategy
Clients should implement exponential backoff with jitter, honoring the Retry-After header when present.
Burst Handling
Short bursts above the steady-state limit are tolerated up to the documented burst ceiling before throttling engages.
Quota Reset
Monthly quotas reset at the start of each calendar month in UTC. Per-minute and per-second windows reset on a sliding-window basis.
Fair Use
Even on uncapped enterprise tiers, sustained usage that materially impacts shared infrastructure may be subject to fair-use throttling.