What does an API integration cost?
Updated: 2026-09
An integration rarely costs what the plain data exchange suggests. The effort sits in the failure cases: duplicate deliveries, unreachable target systems, messy data. That hardening is exactly what separates a durable integration from one that works in a demo.
The cost of an integration is almost always answered too low, because it is measured against the happy path: data from A to B, that is manageable. But the happy path is not the problem.
The effort arises where something goes wrong — and in an integration something regularly does. Catching exactly those cases is what separates a connection that holds in operation from one that quietly loses data.
What drives the cost
Quality of the far side
A well-documented, stable interface takes a fraction of the effort of a poorly documented or unreliable one.
Number and direction of data flows
A one-way sync is considerably simpler than two-way synchronisation with conflict handling.
Data quality and mapping
Where fields do not line up cleanly, mapping and cleaning effort arises that quickly becomes the bulk of the work.
Reliability requirements
Idempotency, retry logic and monitoring are what make an integration robust — and what is usually missing from cheaper quotes.
Volume and timeliness
A nightly sync is simpler than real-time processing under load.
How we price
- 01
Fixed price
Where the scope can be clearly bounded, we work to a binding fixed price. You know exactly what it costs before the project starts — no open-ended hourly billing, no surprises.
- 02
Time and materials against an estimate
Where the scope is not yet fully settled at the start, we work transparently against effort — with an estimate discussed in advance and regular cost control, so nothing runs away.
- 03
Engagement / retainer
For ongoing support — advisory, governance or continuous optimisation — we agree an engagement with a defined scope per month. Predictable cost, flexibly adjustable.
We deliberately publish no online prices: every case differs. After a short first conversation you receive a binding fixed price or clear frame.
Parent service: Custom Software Engineering
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FAQ
Why is there no specific price on the website?
Because a serious price depends on the actual scope, and a number online would almost always be wrong — too high deters, too low leads to unpleasant surprises. After a short first conversation we give you a binding fixed price or a clear range.
How do I get to a binding fixed price?
Through a short, free first conversation in which we clarify scope, goals and constraints. On that basis you receive a specific, binding price — with no hidden costs.
Why do quotes for the same integration differ so much?
Because different amounts of hardening are priced in. A quote without idempotency, retry logic and monitoring is cheaper and delivers an integration that loses data in operation.
What is the most underestimated item?
Data mapping. Two systems modelling the same thing differently cause more effort than the technical connection itself.