What does an API integration cost? (guide prices 2026)

An API integration lets two systems exchange data automatically: orders from your webshop to your accounting, candidates from your website to your ATS, revenue from your till to your dashboard. No more retyping, no errors, no lag. The logical next question is what something like that costs — and there is no single rate that applies everywhere, because an integration is not a product but a project. In this article we give a level-headed guide price for 2026, explain what that price depends on, which three ways of integrating exist and how to work out for yourself whether an integration is worth the investment. Would you rather see what such an automated workflow looks like? Build one yourself in the Flow-Lab.

What does an API integration cost in 2026?

As a guide price for 2026 we work with an indicative €1.500 to €15.000 for a bespoke API integration. That is deliberately a wide band: a simple integration that sends data one way between two modern systems sits at the lower end, an integration between multiple systems, in two directions, with your own business rules and clean error handling sits at the upper end. It is an order of magnitude to work with, not a quote.

Two qualifications to add. First: for common combinations the price is often lower than the general band. An integration between your webshop and your accounting, for example, costs an indicative €500 to €2.000, because there are many ready-made building blocks for it — we wrote a separate article about that: connecting your webshop to your accounting. Second: not every integration calls for bespoke development. Often an automation tool such as Make, Zapier or Power Automate is faster and cheaper, and we simply include that route below.

What does the price depend on?

Two integrations that sound the same on paper can differ by a factor of ten in build time. Four factors determine where you end up in the band:

• Number of systems and directions. Sending data from system A to system B is the simplest case. Synchronising in two directions — where changes can arise on both sides and conflicts have to be resolved — is substantially more work. And every extra system in the chain increases the complexity.
• Quality of the APIs. A modern system with good documentation and a generous API is quick to connect. An outdated package with a half-baked or missing API calls for workarounds — exports, intermediate layers, sometimes even reading out files — and that costs time.
• Complexity of the data translation. Passing on an order number is simple. Translating VAT rates, discounts, partial deliveries, returns and customer-specific prices correctly between two systems that model the world just slightly differently: that is where the real work sits.
• Requirements for error handling and monitoring. What happens if one of the systems goes down for a while, or an order does not meet expectations? An integration that catches errors gracefully, retries and warns you when something goes wrong is more expensive to build than an integration that quietly stops — but you pay for the latter later on in troubleshooting and missing data.

Three ways to connect systems

The build method determines a large part of the price. Roughly speaking there are three routes, each with its own cost profile:

1. Native integration or plugin. Many systems have ready-made integrations with popular counterparts, built by the vendor itself or by a plugin maker. Low set-up costs, often a subscription with the plugin vendor. The downside: you are tied to what the maker has come up with. If your process fits that exactly, this is the cheapest route.

2. Automation tool (Make, Zapier, Power Automate). These tools have thousands of pre-built connectors and let you build workflows with little or no code. The build costs sit at the lower end of the band; on top of that comes a monthly tool subscription that grows with your volume. More flexible than a plugin, faster than bespoke development. Which tool suits which situation, you can read in Zapier vs Make vs Power Automate.

3. Bespoke API integration. An integration programmed specifically for your situation, directly against the APIs of your systems. Full control over logic, volume and error handling, no limitations of a tool — but also the highest build costs. This is the route for high volumes, unusual business rules or systems without a usable connector.

In practice we regularly combine routes: standard steps via a tool, and bespoke development only at the point where the tool falls short. That way you pay bespoke prices only for the part that needs them. More on that trade-off you can read in business process automation: the best tools for SMBs.

Examples of frequently requested integrations

To make the guide price more concrete, a few integrations we come across often:

• Webshop ↔ accounting. Orders, payments and VAT automatically in your accounting package. Guide price an indicative €500-2.000; the most requested integration in e-commerce. See the in-depth article with a step-by-step plan.
• Website or job board ↔ ATS. Applications and candidates automatically in your recruitment system, without retyping from email. Usually well suited to an automation tool and therefore at the lower end of the band.
• CRM or accounting ↔ dashboard. Your figures refreshed automatically in a Power BI dashboard instead of weekly cut-and-paste work. The integration here is often part of the dashboard project.
• Webshop ↔ inventory or fulfilment. Stock levels and shipping statuses in sync between shop and warehouse. One direction is straightforward; real-time in both directions pushes towards the middle of the band.

One-off and ongoing costs

The build costs are one-off, but an integration is not something you build and forget. Factor in three kinds of ongoing costs:

• Tool subscriptions. If you integrate via Make, Zapier or Power Automate, you pay the subscription for that tool. The costs depend on the number of operations per month — as volume grows, the bill grows with it.
• Management and monitoring. You want to know that an integration has stalled before you notice it in your figures. Someone has to keep an eye on it, resolve errors and keep the integration healthy. This can be arranged through a fixed monthly management fee, so you don't pay per incident.
• Changes in the connected systems. APIs change: vendors release new versions and retire old ones. A well-built integration absorbs a lot, but from time to time an adjustment is needed.

So with every quote, don't only ask about the build price, but also what happens after delivery: who monitors, what does an adjustment cost, and who actually owns the integration? With us it holds true: your tenant, your data, your documentation — you're never tied to anything.

When is an integration worth the investment?

The sum is more level-headed than it looks: set the build costs against the hours of manual work the integration removes. A task of half an hour a day — retyping orders, copying candidates, updating a little list — quickly adds up to around 2.5 hours a week, well over 100 hours a year. Add the cost of retyping errors on top: wrong amounts in the accounting, a missed candidate, a customer with an incorrect invoice. Against that backdrop, even an integration at the upper end of the band often pays for itself within a reasonable time.

The reverse also holds: an integration for a task you do twice a month is rarely worth it. So don't start with the technology but with your time leaks. Want to know where in your organisation the most hours are draining away? Request the free Operations Scan — you'll get a short report with your time leaks and opportunities, each with a level-headed estimate in hours per week, so you can do the maths yourself.

Further reading

• Connecting your webshop to your accounting
• Zapier vs Make vs Power Automate
• Business process automation: tools
• The Flow-Lab: automation & API integrations

Frequently asked questions

Written by the RiverFlows team · Updated June 2026. This article is informational; for tailored advice book an intro call.