Rate Limiting & Quota
Headers that tell a caller where it stands against a limit. Documented limits give you the ceiling; these tell you your altitude.
9 headers, ordered by how many providers in the catalog declare them.
Retry-After
330 providers
regulated
3 spellings
How long to wait. The one back-pressure header with real adoption, and a regulatory dimension most providers never consider.
X-RateLimit-Remaining
130 providers
4 spellings
The X-RateLimit-Remaining HTTP header — rate limiting & quota, declared by 130 providers in the API Evangelist catalog.
X-RateLimit-Limit
130 providers
4 spellings
The de facto rate-limit family, declared by 96 providers against 27 for the RFC-track alternative.
X-RateLimit-Reset
107 providers
4 spellings
The X-RateLimit-Reset HTTP header — rate limiting & quota, declared by 107 providers in the API Evangelist catalog.
RateLimit
36 providers
2 spellings
The RateLimit HTTP header — rate limiting & quota, declared by 36 providers in the API Evangelist catalog.
RateLimit-Policy
33 providers
2 spellings
The RateLimit-Policy HTTP header — rate limiting & quota, declared by 33 providers in the API Evangelist catalog.
RateLimit-Limit
32 providers
3 spellings
The RateLimit-Limit HTTP header — rate limiting & quota, declared by 32 providers in the API Evangelist catalog.
RateLimit-Remaining
30 providers
3 spellings
The RateLimit-Remaining HTTP header — rate limiting & quota, declared by 30 providers in the API Evangelist catalog.
RateLimit-Reset
29 providers
3 spellings
The RateLimit-Reset HTTP header — rate limiting & quota, declared by 29 providers in the API Evangelist catalog.