How much does an API integration cost? It depends on how well the systems are prepared to work together and how much needs to happen between them. A simple integration that sends new customers from your website to your email tool is a small job. An integration that syncs orders, stock and invoices both ways is a real project.
An API is the 'plug' that lets software share data with other software. How an integration like this works and how the project runs is covered in having an API integration built. Here we only look at the costs: what do you pay for, and how do you keep it affordable?
What determines the price of an API integration?
The price is mainly the time needed to build, test and make the integration reliable. These factors determine that time:
- Quality of the API. Does the software have a good, documented API? Then it goes faster. A messy or limited API takes a lot of investigation.
- Direction. Does data flow one way, or do two systems need to update each other? Two-way is more work, because you have to decide which system is leading.
- Volume of data. Ten orders a day is different from thousands of records an hour.
- Translating data. One system calls it 'customer number', the other 'debtor'. Matching fields to each other is called mapping and takes time.
- Error handling. What happens if a system is briefly unavailable? A good integration tries again and sends an alert.
- Security. Secure login between systems and careful handling of personal data, in line with the GDPR (AVG in Dutch).
- Number of systems. Every extra system makes the whole more complex.
Standard integration, tool or custom: what costs what?
There are three ways to connect systems. They differ in price, but also in flexibility.
- Standard integration. Many software packages have built-in integrations with well-known software. Often free or for a small monthly fee. Quick to switch on, but you can't adjust much.
- Integration tool. With tools like Zapier, Make or n8n you connect systems without programming. You usually pay a subscription that depends on the number of actions per month (indicative, check the current price). Fine for simple flows.
- Custom integration. A developer builds an integration exactly for your situation. Higher one-off costs, but no limitations and often lower monthly costs.
Which one fits depends on your volume and your requirements. To compare the tools in more detail, read Zapier, Make or n8n. It shows where the limits of each tool lie.
Examples: from simple to complex integration
To estimate API integration costs better, it helps to compare your situation with a few typical examples.
- Simple: a contact form on your website automatically puts new enquiries into your CRM. One direction, few fields.
- Medium: your online shop sends orders and payments to your accounting software. More fields, VAT rates and checks. More on this in connecting your accounting software.
- Complex: stock, orders and customer data are synced both ways between online shop, warehouse and accounting, with error alerts and an overview of what went wrong.
The further down the list you go, the more time goes into testing. That's not a luxury. An integration that occasionally fails silently will cost you more later than one that was built properly from the start.
Recurring costs of an integration
You build an integration once, but it has to keep working. Budget for these recurring items:
- Subscriptions to integration tools, which rise as you use more actions.
- API access. Some software packages charge extra for API access or charge per number of requests.
- Maintenance. Suppliers sometimes change their API. Then the integration needs updating.
- Hosting. A custom integration runs somewhere, for example on a server or in the cloud.
- Monitoring. Someone has to notice when something goes wrong, and fix it.
So with every quote, don't just ask about the build price, but also what the integration costs per month and who maintains it.
Is an API integration worth the cost?
Work out how much time you currently spend retyping, copying and checking. Add the mistakes: a wrong amount on an invoice or an order that doesn't come through. Often an integration turns out to pay for itself within a reasonable time, especially when it concerns daily work.
If it's a task you do a few times a year, you usually don't need an integration. A good calculation method is in automation: costs and benefits.
How to keep API integration costs low
An integration doesn't have to be expensive if you prepare it well. These steps save hours of investigation and testing:
- First check whether a standard integration exists. Ask both suppliers.
- Describe which data needs to go from where to where, and when. A simple diagram on paper already helps.
- Decide which system is leading. Where is the correct version of a customer or product kept?
- Clean up your data before you connect. Otherwise duplicate customers or messy product names simply get copied.
- Make sure the developer gets access to a test environment or test account, so nobody practises in your live records.
- Start with the most important flow. Extra fields and exceptions can come later.
- Ask for a fixed price that includes testing and a short explanation of how the integration works.
Also ask who manages the integration if the developer is no longer around. Good documentation, meaning a short description of what the integration does and where it runs, saves you from having to start over later.
Having an API integration built by Violexa
At Violexa we build integrations as part of AI and automation. An automation project starts from €1,799 excl. VAT (€2,177 incl. VAT), one-off. For a larger project involving several systems, you get a fixed price in writing upfront. That way you know where you stand.
We first check whether a standard integration or a tool is enough. Only if it isn't do we recommend a custom build. Want to know what your integration would cost? Book a free quickscan. In 30 minutes, online or on site, we look at your systems. Afterwards you get short written advice with a price estimate, with no obligation.
Frequently asked questions
How much does an API integration cost per month?
That depends on the route. With an integration tool you pay a subscription that usually rises with the number of actions. With a custom build you mainly pay for hosting and maintenance. Some software packages also charge separately for access to their API.
How long does it take to build an API integration?
A simple integration can be ready within a few days. A two-way integration between several systems, with proper error handling, often takes a few weeks. Testing takes up a good share of that time.
Can I connect systems myself without a developer?
For simple flows, yes, with tools like Zapier, Make or n8n. With large volumes, two-way data or sensitive data it gets tricky. A custom integration is then usually more reliable.
What if my software doesn't have an API?
Then integrating is harder. Sometimes it can be done through export files or email, but that's less reliable. First ask the supplier whether an API or a standard integration exists.
