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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. To ensure success, please note the following:
  • Before running these tests, make sure that you have a sandbox account and an API key.

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Testing Raw Connectivity

To test raw connectivity, you can use the service health ping API endpoint, as below. 
curl -H 'Accept: application/json' \
  -X GET --url https://api-sandbox.circle.com/ping
Successful ResponseIf you reached the API endpoint, you’ll see the response {“message” : “pong”}.

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Testing Your API Key

Verify that your API key is set up correctly by using the get configuration info API endpoint, as below. 
curl -H 'Accept: application/json' \
  -H "Authorization: Bearer ${YOUR_API_KEY}" \
  -X GET --url https://api-sandbox.circle.com/v1/configuration
Successful Response:
JSON
{ "data": { "payments": { "masterWalletId": "1234567890" } } }
Error Response:
JSON
{
  "code": 401,
  "message": "Malformed authorization. Are the credentials properly encoded?"
}