The verdict in three sentences
An ERP-to-B2B-site connector (SAP Business One, Sage, Odoo, Dynamics) lands at 8,000 to 25,000 EUR in 2026 depending on the number of flows and sync mode. Real-time sync and a middleware add 5,000-15,000 EUR and 10,000-30,000 EUR respectively, for a run of 150 to 700 EUR/month. The payoff: -80% re-entry, a reliable online stock and zero orders blocked for lack of up-to-date data.
The flows to sync and their cost
In Berlin, a B2B site selling to professionals must mirror ERP reality: customer-negotiated prices, real availability, outstanding balances and orders. Each flow has its own cost by direction (ERP to site, site to ERP, bidirectional) and frequency.
| Flow | Direction | Typical frequency | Cost |
|---|---|---|---|
| Catalogue + product pages | ERP to site | Daily/hourly | 2,000 - 5,000 EUR |
| Stock/availability | ERP to site | Real time | 3,000 - 8,000 EUR |
| Customer pricing/tariffs | ERP to site | Hourly | 2,000 - 6,000 EUR |
| Orders | Site to ERP | Real time | 3,000 - 9,000 EUR |
| Balances/invoices | Bidirectional | Daily | 2,500 - 7,000 EUR |
| Customers/accounts | Bidirectional | Daily | 2,000 - 5,000 EUR |
Architecture: point-to-point or middleware
Architecture is the main lever for cost and robustness. A point-to-point connector is cheaper upfront but fragile once flows multiply; a middleware (integration bus/iPaaS) costs more but isolates systems and absorbs failures.
| Approach | Project budget | Run/mo | Robustness |
|---|---|---|---|
| Point-to-point (1-2 flows) | 8,000 - 12,000 EUR | 150 - 250 EUR | Fair |
| Orchestrated multi-flow | 12,000 - 25,000 EUR | 250 - 450 EUR | Good |
| Middleware/iPaaS | 20,000 - 40,000 EUR | 400 - 700 EUR | High |
| Real-time sync (+option) | +5,000 - 15,000 EUR | +100 - 200 EUR | Depends on base |
Timelines run 6 to 12 weeks: the older the ERP (flat files, no API), the higher the extraction and reliability effort. Plan a QA phase with error replay and stock discrepancy reconciliation.
Mini case study
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Stefan is IT manager at an industrial supplies distributor in Berlin, 3,000 SKUs, 600 B2B orders/month. Before the connector, two people re-keyed site orders into the ERP, about 90 hours/month combined, with a 4% error rate (wrong price, unseen stockout) generating credit notes and disputes.
He invests 18,000 EUR in a multi-flow connector (catalogue, real-time stock, orders, customer pricing) and 350 EUR/month of run. Re-entry drops -80%, freeing ~72 hours/month. At a loaded 30 EUR/hour, that's 2,160 EUR/month saved, not counting avoided disputes: the project pays back in about 8 to 9 months, then yields a net annual saving above 25,000 EUR.
FAQ
Why does an ERP connector cost more than a CRM one? Because it touches stock, prices and orders: an error blocks a sale or corrupts an invoice. Reliability, failure handling and reconciliation justify a 8,000 to 25,000 EUR budget.
Do we really need real-time stock? For B2B with frequent stockouts, yes: the real-time option (+5,000-15,000 EUR) avoids selling an unavailable product. For deep stocks, hourly sync often suffices.
My ERP is old with no API, is that a blocker? No, but costlier: you go through flat exports, staging databases or dedicated connectors, stretching timelines to 10 to 12 weeks.
What does the 700 EUR/month run cover? The middleware, flow monitoring, failure replay and updates. It's the price of a sync that doesn't silently "fall over" on a Friday night.
Can we start small? Yes: a point-to-point connector on 1-2 priority flows (stock + orders) at 8,000-12,000 EUR validates the value before orchestrating the remaining flows.
Let's scope your project. Tell us your ERP, the number of flows to sync and your order volume, and we'll frame a budget between 8,000 and 40,000 EUR depending on architecture. 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.
