Found at “How to Promote and Market your API: API Directories | Zuplo Learning Center” on 2025-09-16T12:34:08+02:00.

API directories (also known as API indexes) are essentially lists of APIs that developers will find useful when solving certain problems. Imagine you needed an API for sending emails. Sure, you could just type that into Google - and you’ll find options like SendGrid and Mailgun - but you might miss out on other APIs like Resend that are potentially more affordable or easier to use. These days, most established APIs have the resources to invest heavily in ads and SEO, while many startups do not - essentially leaving you with fewer options. API directories act as (sometimes) neutral platforms where all APIs get indexed, are discoverable, and are presented similarly.