Find a User's SE Reputation
Python 2 (with Requests), 149 Bytes
from requests import*
lambda i,r=&quot;reputation&quot;:sum(u[r]for u in get(&quot;http://api.stackexchange.com/users/&quot;+i+&quot;/associated&quot;).json()[&quot;items&quot;]if u[r]&gt;101)

I requested the API, converted the API to JSON, then summed the reputation via a generator expression.  The generator does remove accounts with less than 101 reputation.
Credit for improving the code: Jonathan Allan.