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Most cryptocurrency Exchanges provide powerful API consisting of REST endpoints for transactional operations. In order to authenticate to an Exchange API requires a valid API Key and a secret are required to access the private endpoints.
Many APIs require a signature during authentication that is calculated based on an algorithm like SHA. On this page, you find a collection of Google App Script (GAS) functions for Signed / Private Requests to several exchanges.
These sample code snippets authenticate to the API and will list your balance in the built-in Logger.
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To explore some of these APIs from Google Script, you can try ReX. It's an interactive API explorer in Sheets that allows you to see the request and the response data. ReX is great for educational purposes; the script log will show details on complete HTTP/REST request and response.
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