API questions

[vasilenkomike]

Hello.

I'm trying to develop a crypto mobile app. I read the https://www.blockchain.com/api and have a few questions about it.

1. I filled the form Blockchain API > Request API Key but i did not receive a responce. Could you please tell me what criteria do i have to meet to receive key to [email protected]?

2. I don't found limitations of this API in the documentation. So what the high rps and per what(ip address/api key)?

3. Also there no information about errors. What errors can this API send? What kind? HTTP? Business?

4. Are there any additional documentation files?

5. In my wallet i can see ETH address, what API should i use to receive balance?

6. In REST API how frequently updates values? For example how often should i invoke https://blockchain.info/ticker to receive different values?

Great thanks for answers!
@supportteam2 @schnogz