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Let’s call the simplest endpoint and see real data come back. We’ll list the datasets you can read.

Step 1 — Open your terminal

On Mac/Linux: Terminal. On Windows: Command Prompt or PowerShell. We’ll use curl, a tool that sends HTTP requests from the command line.

Step 2 — Run this command

Replace dd_YOURKEY with your real key:

Step 3 — Read the response

You’ll get JSON back that looks like this:
You just used the API. That’s the whole loop: send a request with your key, get JSON. Every other endpoint follows the same pattern.

What next?