APIs.io · Rate Limits

Apis Io Rate Limits

Enforced rate limits for the APIs.io API. Metered per API key at the AWS API Gateway usage plan bound by the request authorizer: a sustained per-second rate with a short burst ceiling, plus a rolling daily quota. Exceeding either answers 429.

Apis Io Rate Limits is the machine-readable rate-limit profile for APIs.io on the APIs.io network, in the API Commons Rate Limits shape.

It captures 8 rate-limit definitions, across the free, starter, pro, and business tiers, measuring requests_per_second and requests_per_day.

Limit state is signalled in the policy, limit, window, and tier response headers, and an exhausted limit returns HTTP 429.

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

Tagged areas include API Aggregation, API Directory, API Discovery, API Indexing, and API Rating.

8 Limits Exhausted: HTTP 429 Quota: 429 policylimitwindowtier
Method: harvested, dated 2026-08-21.
View Source
API AggregationAPI DirectoryAPI DiscoveryAPI IndexingAPI RatingAPI SearchAPIs.jsonSearch EngineRate LimitingQuotasThrottling

Limits

Free Tier Rate api-key
requests_per_second · second
5
Free Tier Daily Quota api-key
requests_per_day · day
1000
Starter Tier Rate api-key
requests_per_second · second
20
Starter Tier Daily Quota api-key
requests_per_day · day
10000
Pro Tier Rate api-key
requests_per_second · second
100
Pro Tier Daily Quota api-key
requests_per_day · day
100000
Business Tier Rate api-key
requests_per_second · second
400
Business Tier Daily Quota api-key
requests_per_day · day
1000000

Policies

Backoff Strategy
Clients should implement exponential backoff with jitter on 429. Retry-After is not currently sent; back off on the documented policy rather than waiting for it.
Burst Handling
Short bursts above the sustained per-second rate are tolerated up to the burst ceiling before throttling engages.
Quota Reset
The quota window is a rolling 24 hours enforced by the gateway, not a calendar month. The per-second rate is a token bucket.
Tier Gating
Resources above a caller's tier answer 402, not 403 and not 429 — a payment signal, distinct from being rate limited.

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This rate limit 
curl "https://apis.io/api/v1/rate-limits/apis-io-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

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