Heron · Rate Limits

Heron Rate Limits

Heron enforces rate limits per API endpoint and per customer using a fixed-window algorithm (flask-limiter). Every response carries x-ratelimit-* headers advertising the limit, remaining requests, and reset time. The documented example limit is 100 requests per minute; actual limits vary per endpoint and customer.

Heron Rate Limits is the machine-readable rate-limit profile for Heron on the APIs.io network, conforming to the API Commons Rate Limits specification.

It captures 1 rate-limit definition, measuring requests_per_minute.

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

Tagged areas include Rate Limiting and Financial Services.

1 Limits Throttle: 429
Rate LimitingFinancial Services

Limits

Default per-endpoint limit (documented example) endpoint+customer
requests_per_minute · minute
100

Policies

Header-based signaling
Read x-ratelimit-limit / x-ratelimit-remaining / x-ratelimit-reset on every response to self-throttle. reset is a Unix timestamp for the window refill.
429 body
A throttled request returns {code:429, description:" per ", name:"Too Many Requests"}.

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

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