We place rate limits on accessing our service to make sure usage doesn't exceed levels that we consider reasonable (given that we're providing a free service without 3rd party advertising). These are mainly intended to protect against excessive use by automated services rather than impacting typical users. These limits are currently: -
|Action||Limit (per hour)||Limit (per day)|
|Shortening a URL||200||4,800|
|Shortening a URL with optional access statistics turned on||100||2,400|
|Looking up a shortened URL||3,600||86,400|
|Viewing URL statistics||60||1,440|
These limits are enforced on a per-IP basis, so you'd typically only encounter them when a single machine or server makes heavy use of our resources. API apps that run on client machines, browser plugins etc. would typically not run into them. Note that there isn't a specific limit per day, we've just calculated the maximum usage you could make within the hourly limit for easy reference.
These limits use a combined counter so, for example, you couldn't look up 60 URLs and also shorten 30 within the same minute.