Zeffy · Rate Limits

Zeffy Rate Limits

Zeffy's public API enforces a documented rate limit of 100 requests per minute per API key. Exceeding the limit returns HTTP 429. Connections are HTTPS-only. The API is read-only and free, so there is no separate paid quota tier - the same 100 requests/minute limit applies to every organization's API key.

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

It captures 1 rate-limit definition, measuring requests.

An exhausted limit returns HTTP 429.

This profile was written by API Evangelist and has not been verified against a page the provider published; treat every limit as unconfirmed until a dated transcription replaces it.

The profile also includes 2 backoff/retry policies defined and response codes documented for success, unauthorized, and throttled.

Tagged areas include Fundraising, Nonprofit, Rate Limiting, and Quotas.

1 Limits Exhausted: HTTP 429
Method: generated, dated 2026-07-05.
Written by API Evangelist on 2026-07-05 and not verified against a page the provider published. Treat every limit as unconfirmed until a dated transcription replaces it.
View Source
FundraisingNonprofitRate LimitingQuotas

Limits

API Requests apiKey
requests
100 per minute
Documented limit of 100 requests per minute per API key; 429 on exceed.

Policies

HTTPS Only
All API connections must be made over HTTPS.
Backoff Strategy
Clients should implement exponential backoff with jitter on 429 responses.

Sources

Work with this as data

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

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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

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

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