The verdict in three sentences
In 2026, an ERP integration connector ranges from 12,000 to 35,000 EUR excl. VAT depending on the number of flows and the complexity of the target system. Expect 6 to 12 weeks of development, plus 15 % annual maintenance to absorb API and ERP version changes. The real payoff is operational, not technical: ending double data entry frees up accounting hours and eliminates re-keying errors.
What an ERP connector costs per flow
Cost depends less on the ERP itself than on the number of data flows to synchronise. Each flow (customers, products, orders, invoices, stock) is a mini-project: field mapping, business rules, edge-case handling.
| Integration flow | Complexity | 2026 cost (EUR excl. VAT) | Timeline |
|---|---|---|---|
| Customers / accounts | Low | 2,500 - 4,500 | 1 wk |
| Product catalogue + prices | Medium | 3,500 - 6,000 | 1-2 wks |
| Web orders to ERP | High | 4,500 - 8,000 | 2-3 wks |
| Invoices / credit notes | High | 4,000 - 7,000 | 2 wks |
| Real-time stock | High | 3,500 - 6,500 | 2 wks |
| Middleware + monitoring | Cross-cutting | 3,000 - 5,000 | 1-2 wks |
A typical project combines 3 to 4 flows, which explains the overall 12,000-35,000 EUR range.
Real-time REST API or file exchange
Two architectures dominate in 2026. The choice affects cost, responsiveness and robustness.
| Criterion | REST API / webhooks | Files (CSV/EDI batch) |
|---|---|---|
| Upfront cost | 12,000 - 35,000 EUR | 6,000 - 15,000 EUR |
| Data latency | Real-time (< 1 min) | 1 to 24 h |
| Error handling / retries | Native, granular | Frequent manual recovery |
| ERP version dependency | High | Low |
| Annual maintenance | 15 % | 10 % |
| Ideal use case | E-commerce, client portal | Reporting, accounting exports |
For a storefront or B2B portal showing live stock and prices, REST API wins despite the premium. Batch remains relevant for slow, high-volume flows.
Mini case study
Claire, CFO of an industrial SME in Lyon (45 staff), re-keys every web order into Sage: about 2 minutes per line, 900 lines/month, i.e. 30 hours monthly at 35 EUR loaded = 1,050 EUR/month of admin time, plus a 4 % error rate.
She invests 18,000 EUR excl. VAT in a REST connector covering orders, invoices and stock, with 2,700 EUR/year maintenance. Direct saving: 12,600 EUR/year of data entry, before counting avoided errors and eliminated customer follow-ups. ROI in 17 months, then recurring net gain above 10,000 EUR/year.
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FAQ
Do I need middleware or a direct integration?
For 3 or more flows, middleware (an orchestration layer) simplifies monitoring, retries and future flow additions. It adds 3,000 to 5,000 EUR but lowers the cost of later changes.
How much is annual maintenance?
Budget 15 % of the development cost, i.e. 1,800 to 5,250 EUR/year. It covers API updates, ERP version changes and monitoring of failed flows.
How long until a first flow is in production?
A simple flow (customers or products) can go live in 2 to 3 weeks. The full 3-4 flow project spans 6 to 12 weeks depending on ERP access availability.
What happens when the ERP API changes?
SAP, Sage and Odoo APIs evolve regularly. A well-designed connector isolates mapping logic, limiting impact to a few days of updates covered by maintenance.
Can several systems be connected at once?
Yes: ERP + CRM + e-commerce can share the same middleware. It is even recommended to avoid point-to-point integrations that become unmanageable beyond three tools.
Let's scope your project. Tell us your priority flows, your ERP and an indicative budget, and we will define the architecture and connector count. 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.
