Looking for rapid growth? Check out fintech stocks. These companies combine the huge addressable markets of finance with the high growth rates of tech stocks. It's not uncommon to see fintech stocks double or even triple in value in a single year.

Two of the best-known fintech stocks today are Block (NYSE: SQ) and (NASDAQ: PYPL). Both have plenty of upside potential, but one stock in particular can deliver truly huge returns.

Looking for the highest upside fintech stocks? Find companies willing to take risks to stay ahead of the competition.

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Source Fool.com