PIPELINEGuide
API Interfaces: Comparing providers — what really matters
Quotes for API interfaces are hard to compare because everyone writes something different into them. The questions that reveal the differences — and the warning signs.
When comparing providers for API interfaces, what matters less is the stated price and more the question of what happens afterward: who maintains the system after go-live, and what does a later modification cost. That's the difference that only shows after a few months.
01 — Criteria
How quotes differ
- What exactly is included. Two quotes with the same total can cover completely different deliverables. Ask for scope as a list, not as running text.
- Who delivers what. Content, images, data, access — if it's not specified, it becomes a point of conflict later.
- What operation costs. Calculated over three years, including licenses, hosting, and support.
- What happens if you want to switch. Do you get access, data, and documentation? The answer to this question says more about a provider than any reference.
- Who actually does the work. With small providers this matters: who sits in the meeting, and who then does it.
02 — Questions
Questions you should ask
- What happens if the project becomes more expensive than estimated — who bears that?
- Who owns data, access, and, if developed, the source code?
- What does operation cost in the second and third year?
- What does the documentation we receive at the end look like?
- How would you measure whether the project was successful?
- Is there a case in which you would advise us against this?
03 — Warning signs
When to be skeptical
- Guaranteed results. Anyone promising top Google ranking or a specific revenue increase is selling something they can't deliver.
- No pushback. A provider who thinks every project is a good idea has either not listened or is only selling.
- Time pressure. Limited-time discounts on project prices are a sales tool, not an offer.
- Unclear ownership. Anyone who won't clearly say who owns data and access doesn't have your interests at heart.
- No contact with technical expertise. If only sales sits in the first meeting, that's where misunderstandings arise.
04 — Scope
What's included
- Review of existing interfaces in both systems before anything is promised
- Mapping of data fields between systems, including edge cases
- Error handling with retry and notification
- Logging of every exchange for traceability
- Monitoring that reports when the connection goes silent
- Documentation in case someone else needs to maintain it later
05 — Questions
Frequently asked questions
Is an interface more secure than a manual export?
Significantly, because human errors during export and import are eliminated and every exchange is logged. A manual export leaves no trace if something was overlooked.
Who maintains it later?
You receive code and documentation. We deliberately build with widely used technologies so that switching is possible.
How often is data synchronized?
From immediately to nightly — depending on what's technically necessary. Immediate synchronization isn't always better: for systems with post-processing, a nightly run is often the more stable choice.
What if our legacy system has no interface?
Then there are usually workarounds: database access, automated file exchange, in exceptional cases surface automation. All are more fragile than a real interface. We'll honestly tell you how stable such a solution will be before you decide.
Can multiple systems be connected simultaneously?
Yes, that's actually the more common case — for example, shop, inventory management, and accounting together. Each connection is planned and tested individually, even if everything works together in the end.
What happens during an outage?
The connection remembers what hasn't been transferred yet, tries again, and reports after multiple failed attempts. Data isn't lost, it arrives delayed.
What does maintenance cost during operation?
As long as none of the connected systems changes fundamentally, ongoing effort is low — monitoring reports itself when something doesn't fit.
06 — Next
Related pages
Next step
Let's talk briefly about whether this makes sense for you.
A twenty-minute conversation is usually enough to clarify whether a project makes sense. If not, we'll say so — that's cheaper for both sides than an offer nobody needs.