RapidAPI merged with Mashape, then reached 8,000 APIs and 400B monthly calls

Developers had virtually limitless APIs to choose from, but the volume created a discovery and organization problem. RapidAPI ran a marketplace for finding and integrating external APIs, while similar services such as ProgrammableWeb and APIList competed for the cataloging job.

The turning-point decision was consolidation: RapidAPI merged with Mashape, a similar API-search marketplace, in 2017. It then raised a $9 million Series A led by Martin Casado at Andreessen Horowitz; the round brought its total venture funding to $12.5 million and put Casado on the board.

The resulting marketplace showed scale: RapidAPI said it listed more than 8,000 APIs and had 400 billion API calls made each month. The company had turned a fragmented discovery problem into a single place where developers could find and integrate outside functionality.

After the Mashape merger and $9M Series A, RapidAPI reported 8,000 APIs listed and 400 billion API calls per month, with $12.5M total venture funding.

API supply was virtually limitless, making discovery and organization a real bottleneck for developers.

Mashape already provided a similar search marketplace, so the merger consolidated adjacent capability instead of building a second catalog.

Andreessen Horowitz backed RapidAPI in both the seed and Series A rounds and added board-level support for scaling.

A marketplace let developers reuse outside functionality rather than build every data source or service themselves.

When a market is fragmented by discoverability, combine adjacent search platforms into one marketplace, then fund the scale-up; usage is the proof that consolidation solved a real bottleneck.

RapidAPI emerged from the merger as one of the fastest-growing marketplaces for open APIs, with fresh capital and measurable usage. Its model put discoverability between developers and an expanding supply of APIs, turning catalog organization into a scalable platform business.