You’ve raised a very valid point! Using another startup’s API can be a smart move to save development time and resources, especially if they offer a well-tested and reliable solution. However, the risk of dependency on their service is something to consider seriously, particularly for a core functionality. It might be worth analyzing the stability of their business and service terms, as well as having a contingency plan in place.

If you're working in logistics or trucking, this resource could provide additional insights: https://www.cleveroad.com/blog/trucking-api/. It discusses API integration and its potential in building robust solutions. Best of luck with your product development!