How do I get wallet balance using xPub address with blockain.info api? I am using blockchain.info api. I know how to get wallet balance using wallet id and password. 

Couldn't find how to find wallet balance using my xPub address.
See this link:

Multi Address
https://blockchain.info/multiaddr?active=$address|$address
Multiple addresses divided by |
Address can be base58 or xpub
Optional limit parameter to show n transactions e.g. &amp;n=50 (Default: 50, Max: 100)
Optional offset parameter to skip the first n transactions e.g. &amp;offset=100 (Page 2 for limit 50)