Both are in the business of putting a single API key in front of a fragmented ecosystem and charging a convenience fee. This middleman business is naturally coalescing.

The nature of the ecosystem also means that pricing is closely tied to "procurement" which could be routing, limits, whatever at a company level.

If stripe wants to be _the_ one that charges that fee, they either have to continuously try to ensure that all the different middlenen use stripe (most of them do!) but even better is to acquire the largest middleman.

You don't want someone else who happens to do all the routing+limits+policies, end up not using stripe. They already have this hold in existing stripe financial products where they apply all the policies, and everything goes through them.

It is also an easy deal from an investor point of view.