The short answer
API development and integration work runs $2,000–$15,000 per project, with a typical job around $6,500. Across both public APIs and two-system integrations, the cost lives in the parts nobody sees — data structure, security, error handling, and documentation.
| Tier | Range | What you get |
|---|---|---|
| Simple integration | $1,000–$2,000 | Connecting to a well-documented third-party API, one direction. |
| Standard build | $2,000–$7,000 | A custom API or two-way integration, authentication, error handling, docs. |
| Complex system | $7,000–$12,000 | Multiple integrations, data transformation, rate limiting, versioning. |
| Enterprise-grade | $12,000–$18,000+ | High-volume, heavily secured, fully documented public-facing APIs. |
What actually moves the price
Documentation quality of what you’re connecting to. Half the cost of an integration is the other system’s documentation lottery. A clean, modern API is a quick job; an old, poorly documented, or flaky one turns a two-day task into two weeks. A developer who has touched your target system before is worth more because they already know where the bodies are buried.
The unhappy path. Anyone can make an API work when everything cooperates. The real work is what happens when it doesn’t — a timeout, a rate limit, malformed data, a service that’s down. Robust error handling and retries are most of what separates a $2,000 integration that breaks quietly from a $7,000 one that stays up.
Documentation you leave behind. If you’re building an API others will use — including your own future developers — clear docs and versioning are part of the deliverable, not a nicety. Ask for them explicitly; an undocumented API is a liability the day the person who built it leaves.
How this guide is priced
Ranges are compiled from public market data and published rate listings — see our data methodology. As the Mindhyv marketplace grows, these figures will come from real, anonymized platform data instead.
Before you hire
Read the API developer hiring guide for the questions that expose weak error handling, and define the endpoints and systems in a statement of work so scope is pinned before work begins.