Video conferencing has become an essential part of daily life due to the Covid-19 pandemic, with businesses and individuals using it for various purposes such as telehealth, test prep, dating, shopping, and more. Building a scalable video infrastructure from scratch can be time and resource-intensive, so many organizations opt for Video call APIs providers that offer best-in-class video infrastructure. This article provides a comprehensive buying guide to help businesses choose the right video API by comparing vendors across four parameters: functionality & features, compliance & security, support, and pricing. The detailed comparison includes information on each vendor's product capabilities, security certifications, support plans, and pricing models. The key points covered in this article are: 1. Video conferencing has become a necessity due to the pandemic. 2. Building video infrastructure from scratch can be challenging. 3. Video call APIs providers offer best-in-class video infrastructure. 4. A buying guide helps businesses choose the right video API by comparing vendors across four parameters.