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Let's start with Defy Blockchain API
Simply append key=API_KEY as a query parameter to all requests. The main advantage of this method is to embed the API endpoints within applications that do not support more sophisticated auth mechanisms, like Google Sheets or as IFrames.
Example of basic authentication.
curl --location --request GET 'https://api.getdefy.co/v1/o/ENDPOINT/' \
-H 'Content-Type: application/json'
Provide your API key as the basic auth username. You do not need to provide a password.