The U.S. stock market remains extremely attractive to investors around the world, simply because of its sheer size and liquidity. But it’s still quite difficult for investors in other parts of the globe to trade stocks on U.S. exchanges. Startup Alpaca has quietly capitalized on that opportunity by offering an API to financial services firms that lets them sell trading services to their consumer user bases. Alpaca claims it serves more than 5 million brokerage accounts, and has more than 200 financial clients in 40 countries. To build on that traction, Alpaca has raised $52 million in a Series C funding round to expand into more foreign markets, including the Middle East, Europe, and Asia. The startup just opened a new office in New York, and it plans to use the fresh cash to obtain more regulatory licenses in different regions, similar to those it already has in the U.S., Japan, and the Bahamas, its co-founder and CEO Yoshi Yokokawa told. Alpaca will also use the proceeds to develop new products, add non-U.S. products like European and Asian equities, and support 24/5 trading of U.S. stocks. “When new banks want to improve their products for their customers, they prefer to work with modern partners because their customers want modern solutions. So that is how we are currently winning the market share over them,” Yokokawa added.