They didn't provide any API documentation, but by looking at the network requests made by the web browser, they use the following that can be entered as Block Explorer URL in Awesome Miner
http://20.184.13.116/v2/addr/[address]

Then it turns out that they report the balance in unites of "1E-7", so if you select the 1E-8 setting in Awesome Miner you will get a balance 10 times too low. I will add a new setting for selecting 1E-7 in the next release.