5 impressive API monetization models

Bill Doerrfeld | March 19, 2026

Usage-based pricing is in: These 5 APIs epitomize that shift

OpenAI's developer platform has reached roughly $1 billion in annualized revenue. 😲


Most people familiar with API businesses have heard the canonical success stories (Stripe and Twilio) along with earlier examples like the Amazon Mandate, eBay’s Buy APIs, Expedia Group’s partner ecosystem, and Salesforce’s platform.


But in 2026, a new breed of usage-based monetization is emerging, increasingly built around on-demand infrastructure and API-level metering.


My latest post for the Zuplo blog highlights a handful of API monetization success stories from the 2020s, including Plaid, AssemblyAI, OpenAI, and Algolia — and revisits SendGrid as a classic example (and notable exit).


Check it out to see what these APIs enable, what units they use to meter usage, and what the business outcomes look like.


Read: 5 API Monetization Success Stories

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