When it comes to financial technology (fintech) companies, one of the most important in the world is privately-held Stripe. In its latest funding round in March, the company was valued at $50 billion, making it the second-most valuable U.S. start-up company behind SpaceX.

Stripe is big and fast-growing. And that's why investors may be interested in knowing that fellow fintech company Block (NYSE: SQ) could get a boost from Stripe thanks to a recent announcement.

Stripe offers software that allows businesses to build online payment and billing features. And on June 7, the company announced that its payments software will now support Cash App -- specifically, Cash App Pay.

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Source Fool.com