![]() Further still, by blocking a key, you can partially prevent abuse in the case of too-high request volumes. For companies which make money from selling such services, it's also a way of tracking who's using the thing for billing purposes. For example, you can restrict access to certain API actions based on who's performing the request. Typically, if you can identify the source of a request positively, it acts as a form of authentication, which can lead to access control. The key may be included in some digest of the request content to further verify the origin and to prevent tampering with the values. By and large, however, an API key is the name given to some form of secret token which is submitted alongside web service (or similar) requests in order to identify the origin of the request. What "exactly" an API key is used for depends very much on who issues it, and what services it's being used for.
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