What is the API? How to set up?

What is API?  
API is a simple and powerful developing tool, an integration that helps users integrate the most of trade functions of ViaBTC to their own app efficiently. 

How to extract API Key?
1. Enter https://www.viabtc.com/ and navigate to [Settings]. 

2. Find [API Key] in the [Mining Settings].

3. Click [Check], then enter the Email verification code and 6-digit GA code as required on the page. Once you're ready, hit [Next] to check the secret key corresponding to your current API. 

4. To whitelist an IP address for your current API, click [Setup] next to [IP Whitelist], then enter the Email verification code and 6-digit GA code to proceed.

5. Hit [Next] to add IP whitelist.

You can learn more about API settings through the link below:
 https://github.com/viabtc/viapool_api/wiki