Do not return the payload in the response

[bridgedragon]

• [x] I have read the Contributing file of the documentation.
• [x] I have searched the issues (including closed ones) and believe that this is not a duplicate.

Issue

When you call a method on the api, the method call itself is returned in the response. That's incorrect from the security point of view.

For example: Request: http://xxx.xxx.xxx.xxx/btc/mainnet/abcdtest

Response:

{
    "message": "Calling unknown method indexing<test> for wrapper API btc",
    "code": 400
}

Response should not contain 'abcdtest' in it.