The Most Important API Metric Is Time to First Call

API publishers within the Postman community are striving to create more seamless developer experiences by enhancing the onboarding process through public workspaces, with a particular focus on improving the Time to First Call (TTFC) metric. This study highlights that TTFC is crucial for public APIs as it represents the initial payoff for developers, allowing them to quickly understand and integrate the API into their applications. The developer journey to an API involves several stages, including browsing, signing up, making the first API call, implementation, and usage, with each stage offering insights into the API's capabilities and suitability. Improving TTFC not only streamlines the onboarding process but also expands the potential market by creating a pool of better-educated users. The effectiveness of TTFC can be measured both subjectively through usability testing and objectively using web analytics, focusing on the quality of documentation, sign-up processes, and onboarding guides. Enhancing TTFC is essential for maximizing the developer base and overall API adoption, as demonstrated by companies like Vonage and Symbl using Postman public workspaces to optimize their onboarding processes.

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