_Circle’s sandbox environment is a development tool that allows you to safely test prototypes and integration without generating actual financial transactions. Sandbox APIs match those in production, making it easy to move into the production phase._
Before running these tests, make sure that you have a [sandbox account](🔗) and an API key.
## Testing Raw Connectivity
To test raw connectivity, hit the [service health API endpoint](🔗) by running the command below.
Successful Response
If you reached the API endpoint, you’ll see the response {"message" : "pong"}\.
## Testing Your API Key
Verify that your API key is set up correctly by running the command below to hit a read endpoint (in this case, the [configuration endpoint](🔗)).
Successful Response
Error Response