The verdict in three sentences
A real-time ERP-to-e-commerce connector (webhooks, conflict handling, monitoring) costs in 2026 between EUR 18,000 and EUR 50,000, delivered in 6 to 10 weeks. It syncs stock, prices and orders both ways, removing oversells and stockouts caused by delayed updates. The real debate is not price but the choice between batch and real time.
Connector budget for 2026
The project covers data mapping (SKUs, prices, VAT, warehouses), real-time flows via webhooks, conflict handling and monitoring with alerts.
| Item | 2026 order of magnitude | Type |
|---|---|---|
| Scoping + data mapping | EUR 3,000 - 8,000 | One-off |
| Real-time stock/price flows (webhooks) | EUR 6,000 - 18,000 | One-off |
| ERP order synchronization | EUR 5,000 - 15,000 | One-off |
| Conflict handling + error recovery | EUR 3,000 - 10,000 | One-off |
| Infrastructure (message queue, hosting) | EUR 150 - 700 / month | Recurring |
| Monitoring + maintenance | EUR 300 - 1,000 / month | Recurring |
Batch vs real time: what changes
Real time costs more to build but removes the desync window. The concrete differences:
| Criterion | Batch (every X h) | Real time (webhooks) |
|---|---|---|
| Stock freshness | 1 to 24 h lag | A few seconds |
| Oversell risk | High during promos | Near zero |
| Setup cost | EUR 8,000 - 20,000 | EUR 18,000 - 50,000 |
| Monthly infra cost | EUR 50 - 200 | EUR 150 - 700 |
| Suited to | Low turnover | High turnover, promos |
Stockouts and oversells avoided
An oversell is costly: cancellation, refund, damaged image, sometimes an emergency at-a-loss purchase. A hidden stockout drives the customer away. Moving to real time removes nearly all these incidents for a high-turnover distributor. Order of magnitude: on 8,000 orders/month, cutting the oversell rate from 1.5 % to 0.1 % avoids about 112 monthly incidents, each costing EUR 15 to 40 in handling and refund.
Mini case study
Julien, e-commerce lead at an Amsterdam distributor, runs 8,000 orders/month with an ERP and store synced only in a nightly batch. Oversells hit 1.5 %, i.e. 120 incidents/month at about EUR 28 each: EUR 3,360/month of losses, not counting invisible stockouts. He invests EUR 34,000 in a real-time connector. Incidents drop to 0.1 %. Net saving about EUR 3,100/month plus revenue saved on stockouts: paid back in about 6 months.
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FAQ
Real time or batch to start?
If you run promos or have high turnover, real time is justified. For a stable, low-turnover catalog, batch often suffices.
What happens on a data conflict?
The connector applies a priority rule (often the ERP is authoritative on stock) and logs the conflict for arbitration. Error recovery replays missed events.
Which ERPs and platforms are supported?
SAP Business One, Sage, Odoo, Exact on the ERP side; Shopify, WooCommerce, PrestaShop, Magento on the store side. Mapping adapts to your setup.
What is the recurring infrastructure cost?
EUR 150 to 700/month for the message queue and real-time hosting, plus EUR 300 to 1,000/month of monitoring and maintenance.
How long to production?
6 to 10 weeks depending on the number of flows and mapping complexity. A stock-only pilot can ship faster.
Let's scope your project. Share your ERP, e-commerce platform and order volume for a precise estimate. 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.
