Application programming interface (API) debugging tool provider Runscope has closed $6 million in a Series A funding with General Catalyst Partners as the lead investor. Other backers include Lerer Ventures and True Ventures, according to VentureBeat.

Under the terms of the investment deal, General Catalyst investor Steve Herrod will become part of the startup's board. Runscope will use the new funding to launch tools that will help companies monitor and test thier API-based services, the report detailed.

The rising popularity of APIs rides the trend of increasing mobile apps. Companies can now build a lighter app that will link to a back end rather than loading up a bulky software program on the limited memory of a mobile phone. Runscope helps monitor the APIs that are not running properly. Its currently serves several customers including Docusign, Fitbit, uShip, and Xamarin, GigaOM explained.

Runscope is a San Francisco-based startup that was launched a year ago. The company is a provider of API debugging and testing tools. Its customers use its products to build software, the report added.