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Anyone know of an API that will take a CUSIP and return a stock's symbol and vise versa?

+1  A: 

Take a look at: http://www.xignite.com/xSecurity.asmx

Nestor
A: 

S&P assigns CUSIPs and sells access to their data through various (expensive) fee models.

https://www.access.cusip.com/home.htm

cdonner