Per the title, the API appears to not work.


For anyone who started CS50 Finance before now (and are still working on it), do know that there has been update to the spec

See this new section about configuring your API key

There is also a new helpers.py. You should delete your old one and then run wget https://cdn.cs50.net/2019/x/psets/8/finance/helpers.py to grab the new one.

Our API provider now requires individual keys.


  • one small tweak. if helpers.py doesn't have import os at the very top, please add that.
    – curiouskiwi
    Jun 18 '19 at 4:23
  • I was also having issues with lookup function returning None. Downloaded the new helpers.py and solved it. Thank you very much.
    – Ajay Babu
    Nov 12 '19 at 10:00

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