Microservices are being proclaimed as a groundbreaking architectural style for producing and sustaining business and IT applications and platforms. Cloud environments are filled up with bare metal servers, virtual machines, and containers. Microservices can be hosted on these and run to extract and supply their unique functionalities. As the number of microservices is growing rapidly, we need technology-sponsored and complexity mitigation solutions and services. API gateway solutions are being presented as the viable and venerable infrastructure (software or hardware) solutions for that bring a kind of abstraction to reduce dependency-induced problems. This chapter detailed the various features of API gateway solutions and how they come in handy for resolving various microservice-specific issues. The key gateway solutions (open source and commercial grade) and their unique properties were documented for your benefit. The next chapter is about how microservices have to be tested in a systematic manner and speed up the testing needs through scores of automated testing tools.