The verdict in three sentences
In 2026, an ERP API integration costs between 12 000 and 50 000 EUR, depending on the number of flows and mapping complexity. The most underestimated item is not the connection but error handling: retries, idempotency, reconciliation. An open ERP like Odoo costs less than a locked SAP, but it is the cleanliness of your data that really moves the bill.
How much an ERP integration costs in 2026
Read the budget by flow volume and direction (read-only vs two-way sync). A simple order feed is far cheaper than real-time stock, customer and invoice synchronisation.
| Scenario | Flows | 2026 price (EUR) | Timeline |
|---|---|---|---|
| Read-only | 1 flow (catalogue, stock) | 12 000 - 18 000 | 3-5 wks |
| Simple sync | 2-3 flows, batch | 18 000 - 30 000 | 5-8 wks |
| Advanced sync | 4-6 flows, real time | 30 000 - 50 000 | 8-14 wks |
| Managed iPaaS | Connector + monitoring | +8 000 - 15 000 | +2-3 wks |
2026 order of magnitude, excluding ERP licences and iPaaS middleware cost (often 200-800 EUR/month).
Complexity and cost by ERP
Not all ERPs expose the same API quality. This directly drives man-days.
| ERP | API | Difficulty | Uplift vs base | Watch points |
|---|---|---|---|---|
| Odoo | Open REST/XML-RPC | Low | 0 % | Custom fields, versions |
| Sage | API + files | Medium | +15 % | Mixed formats |
| Cegid | Partner API | Medium | +20 % | Access, quotas |
| Dynamics 365 | OData/REST | Medium | +20 % | Auth, throttling |
| SAP S/4HANA | OData/BAPI | High | +40-60 % | Governance, licence cost |
The true cost variable remains data mapping: the cleaner and more normalised your reference data (customers, products, VAT), the less time integration takes.
Mini case study
Sophie, CIO of a B2B distributor in Rotterdam (60M EUR turnover), wants to sync stock and orders between her site and Odoo. She budgets 28 000 EUR for a two-way sync (real-time stock, nightly batch orders) with retries and alerting. By removing double entry of 400 orders/month (about 30 min re-keying and disputes per error), she saves nearly 2 FTE-days per week, a payback in under 10 months.
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FAQ
Why is SAP more expensive to integrate?
SAP enforces strict governance, complex business objects (BAPI/OData) and sometimes access licences. Expect a 40 to 60 % uplift versus an open Odoo.
Real time or nightly batch: which to choose?
Batch is enough for accounting and reporting and costs 20-30 % less. Real time is required for stock and product availability on an active e-commerce site.
iPaaS middleware or custom code?
An iPaaS (200-800 EUR/month) speeds up and monitors standard flows. Custom stays relevant for specific business logic or high volumes where iPaaS fees grow large.
How do we avoid duplicates and sync errors?
Through idempotency (each message processed once) and reconciliation keys. It is 15 to 25 % of budget but prevents costly invoicing disputes.
How long for a first integration?
A simple read-only flow ships in 3 to 5 weeks. A real-time two-way sync takes 8 to 14 weeks depending on the ERP.
Let's scope your project. Tell us your ERP, the flows to sync (stock, orders, invoices) and monthly volume: we price mapping, error handling and the iPaaS option. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
