Internal transfer not working

For the following request

```
curl -X POST /*auth part*/
    "https://api.hitbtc.com/api/2/account/transfer" \
    -d "currency=btx&amount=0.009632&type=exchangeToBank"
```

I've getting response

`{"error":{"code":2002,"message":"Currency not found","description":"The requested currency can't found. Requested: "}}
`
It was working before.