API-First
A development approach where the API is designed and built before the user interface.
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Definition
API-first is a software development approach where the application programming interface (API) is the primary product, designed and built before any user interface. The API serves as the contract between services, enabling other developers and systems to interact with the product programmatically.
API-first companies include Stripe (payments), Twilio (communications), SendGrid (email), and Plaid (financial data). These companies prioritize developer experience, comprehensive documentation, and reliable infrastructure.
The API-first approach aligns with modern software architecture, where applications are composed of multiple services communicating through APIs. This makes products more composable, integrable, and extensible than monolithic applications.
Why It Matters for Founders
API-first products are inherently sticky — once integrated into a customer's codebase, switching costs are high. This creates strong retention and defensive moats. API-first companies also benefit from network effects as more developers build on their platforms.
For founders, the API-first approach enables serving a wide range of use cases without building custom UIs for each one. Developers become the primary users and advocates, creating a powerful bottom-up distribution channel.
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Real-World Example
Stripe is the quintessential API-first company. Developers integrate Stripe's payment API, and the product is consumed entirely through code before any dashboard UI is built.
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Frequently Asked Questions
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