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To access our API and take advantage of all the available methods, you will need to authenticate your requests using your unique API Key. This key is a secure authentication mechanism that ensures only authorized users can access the API. To obtain your API Key, navigate to your account dashboard. Send the key in the Authorization header on every request to https://v2.greipapi.com:
cURL
Do not pass the API key as ?key= or in a JSON key field on v2. That returns invalid_params (104). See Migration.

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API v1 (Legacy)

On the legacy host (https://greipapi.com), you may pass the key in the query string:
Bearer authentication is also supported on v1:
cURL

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Securing your API Key

For more information about how to secure your API Key, please refer to Protecting your API Key.