Knowledge Hub

API Development

Build robust, scalable APIs for your applications. Design patterns, authentication, rate limiting, documentation, and production deployment.

An API (Application Programming Interface) is how two pieces of software talk to each other — your website's backend and its mobile app, or your own system and a third-party service like a payment processor. "API integration" projects usually mean connecting your product to an existing third-party API, rather than building a brand-new one from scratch.

Two Kinds of API Work

Building your own API — creating the interface your own apps (web, mobile) use to talk to your backend and database.
Integrating a third-party API — connecting your product to an external service (payments, maps, SMS, identity verification) that already exists.

Most "API integration" requests fall into the second category, and the cost depends heavily on how well-documented and reliable the third-party API is — some integrations are a day of work, others involve significant back-and-forth with the provider's support team.

What API Development/Integration Typically Costs

Tier	Typical Range	Timeline	Best For
Single third-party integration	$500 – $3,000	3 days – 2 weeks	Adding one well-documented service (payments, SMS, maps) to an existing product
Custom API for your own product	$5,000 – $25,000	4–10 weeks	Building the backend API powering your own web/mobile apps
Complex multi-system integration	$15,000 – $50,000+	8–16+ weeks	Connecting several systems with data syncing and error handling

What Makes an Integration Harder Than Expected

Poor or outdated documentation from the third-party provider
Rate limits that require careful request management at scale
Handling failures gracefully (the third-party service being temporarily down shouldn't break your whole product)
Keeping data in sync when the same information lives in two systems

Frequently Asked Questions

A single, well-documented third-party integration (payment gateway, SMS provider) often takes a few days to two weeks. Complex integrations across multiple systems with data syncing can take considerably longer.