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API Rate Limiting

Rate limits apply to all API endpoints.

Per IP address

Rate limiting of the API is primarily on a per-user basis - or more accurately described, per its IP address. If an API allows for 500 requests per rate limit window, then it allows 500 requests per window per IP address.

10 Second Windows

Rate limits are divided into 10 second intervals. This limit is valid for both, authenticated and unauthenticated calls.

HTTP Headers and Response Codes

Use the HTTP headers in order to understand where the application is at for a given rate limit.

When an application exceeds the rate limit, the API will return a HTTP 429 “Too Many Requests” response code, and the following error will be returned in the response body:

    "error": "Rate limit exceeded. Please retry in 10 seconds."

Sample response

HTTP/1.1 429 Too Many Requests
Cache-Control: no-cache
Content-Type: application/json
Retry-After: 10
Transfer-Encoding: chunked
X-Rate-Limit-Limit: 500
X-Rate-Limit-Remaining: 0
X-Rate-Limit-Reset: 10
X-Request-Id: c805a564-1ce2-4803-bd74-e91002b0c56a
X-Runtime: 0.002531

    "error": "Rate limit exceeded. Please retry in 10 seconds."

Tips to avoid being Rate Limited

The tips below are there to help you code defensively and reduce the possibility of being rate limited. Some application features that you may want to provide are simply impossible in light of rate limiting, especially around the freshness of results.


Store API responses in your application or on your site if you expect a lot of use. For example, don’t try to call the API on every page load of your website. Instead, call the API infrequently and load the response into a local cache. When users hit your website load the cached version of the results.

Prioritize active resources

If your site keeps track of many resources (for example, fetching their current status), consider only requesting data for recently active resources.

Adapt to the search results

If your application monitors a high volume of search terms, query less often for searches that have no results than for those that do. By using a back-off you can keep up to date on queries that are popular but not waste cycles requesting queries that very rarely change. Consider using filters, sorting and pages for your API calls.


If an application abuses the rate limits, it will be blacklisted. Blacklisted apps are unable to get a response from the API. If you or your application has been blacklisted and you think there has been a mistake, you can contact our support team to request assistance. Please include the following information:

Yardman, our YMS Software