The vanity metrics are endpoints shipped, APIs published, developers registered, and total calls. Every one of them can go up while nothing of value happens.
Measure the funnel instead. How many people land, how many sign up, how many make a first successful call, how long that took them, how many are still calling in thirty days, how many reach production, and how many are still there a year later. Each drop-off between those stages points at a specific, fixable problem.
Then measure the outcomes on the other side. Not “two million calls” but “two million verifications completed,” “eleven thousand orders fulfilled,” “these six customer integrations that would otherwise be a services engagement.” That is the number that survives a budget conversation.
Watch the quality signals too: error rate by consumer, support tickets per active integration, time from signup to first successful call, and how many consumers are stuck below their first call. A high signup count with a low first-call rate is not adoption; it is a funnel with a wall in it.
Underneath all of it sits the one principle I keep returning to: an API has no value until it is actually used. The whole business of APIs is the work of turning value possible into value realized.
