Use the HTTP API to query your current balance.
Please issue the request to the following URL:
https://gateway.sms77.io/api/balance
The query requires no parameters other than your authentication data. The return is done as a simple text with your current balance as a float number with a dot as a separator for the decimal places.
Example
Request:
https://gateway.sms77.io/api/balance?p=api-key
Response:
27.83