The verdict in three sentences
An e-commerce to ERP connector costs between EUR 12,000 and 32,000 in Amsterdam in 2026, driven by the flows to sync and the ERP complexity. The return is concrete: -25% stockouts and -18 hours/month of manual order entry. It becomes essential once volume passes a few hundred orders a month.
What determines the price in 2026
Budget depends on the flows (products, stock, prices, orders, invoices), the sync direction and the target ERP. A modern ERP with an API costs far less to integrate than a legacy system with no documented interface.
| Scope | 2026 price (EUR) | Timeline | Typical content |
|---|---|---|---|
| Stock + order sync | 12,000 - 16,000 | 4 weeks | 2 flows, one-way or simple |
| Full connector | 16,000 - 24,000 | 5-6 weeks | Products, stock, prices, orders, two-way sync |
| Connector + invoicing / accounting | 24,000 - 32,000 | 6-8 weeks | Adds invoicing, credit notes, accounting |
| Legacy ERP without API | 28,000 - 42,000 | 8-10 weeks | Intermediary gateway, files, robustness |
Recurring costs cover application maintenance and changes tied to store or ERP updates.
| Recurring item | 2026 range | Note |
|---|---|---|
| Connector maintenance | EUR 300 - 650/month | By flow volume |
| Monitoring / alerting | EUR 70 - 200/month | Sync monitoring |
| Integration day rate | EUR 600 - 920 | Per task |
| Annual evolution (APIs) | EUR 2,000 - 5,000 | One-off |
Amsterdam vs Nantes: 2026 order of magnitude
2026 estimates for a comparable sync scope.
| Item | Amsterdam (EUR) | Nantes (EUR) |
|---|---|---|
| Full connector | 12,000 - 32,000 | 8,000 - 25,000 |
| Integration day rate | 600 - 920 | 470 - 760 |
| Monthly maintenance | 300 - 650 | 200 - 500 |
| Average timeline | 5-9 weeks | 4-8 weeks |
Mini case study
Bram, owner of a B2B industrial-supplies e-commerce in Amsterdam (12 staff), handles 900 orders/month with manual re-keying between store and ERP. Unreflected stockouts cause 4% cancellations. He invests EUR 22,000 in a full two-way connector, plus EUR 450/month maintenance.
Calculation: he saves 18 hours/month of entry (valued at EUR 40/hour loaded, or EUR 720/month) and cuts stockouts by 25%, recovering part of the 4% cancellations. On monthly revenue of EUR 180,000, recovering 1 point of cancellations is EUR 1,800/month. The combined gain (~EUR 2,500/month) pays back the investment in about 9 months.
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FAQ
How long to connect my store to my ERP?
4 to 9 weeks in 2026 depending on flows. A stock + order sync ships in 4 weeks; a full connector with invoicing in 6 to 8 weeks.
My ERP is old with no API, is it possible?
Yes, via an intermediary gateway (files, buffer database). Expect EUR 28,000 to 42,000 and a longer timeline, but a reliable result.
Is the sync real-time?
As needed: real-time for critical stock, batched (every 15-60 min) for the rest. Real-time raises maintenance cost slightly.
Which e-commerce platforms are compatible?
All major ones (Shopify, WooCommerce, PrestaShop, Magento) expose sufficient APIs. The connector adapts to your existing store.
What happens if a sync fails?
An alerting and automatic-retry system handles errors. Monitoring (EUR 70-200/month) ensures no order is lost.
Let's scope your project. Tell us your platform, ERP and monthly order volume, and we will scope the connector and priority flows. 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.
