CHART: Here's How Fast Square Is Growing

Square, the payments startup run by Twitter cofounder Jack Dorsey, is growing payments volume at a runaway clip.

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For Square, payments volume is a very close proxy for revenues: It takes a 2.75% cut of most transactions, which it then splits with Visa, MasterCard, and the banks.

The company has 330 employees at last count. We don't believe it's profitable yet, but at these growth rates—20 percent in the last two months—it could easily make money if it chose to. We think instead it's going to keep spending to acquire small-business customers.

View the full size chart and read more about Square and how it could impact your CU.