The verdict in three sentences
A store disconnected from the ERP means double entry, phantom stockouts and wrong prices: the connector isn't a luxury, it's operational hygiene. A dedicated real-time API costs 12,000 to 40,000 EUR excl. tax (5 to 10 weeks), whereas an iPaaS costs 500 to 3,000 EUR/month but stays generic. The real cost to avoid is desynced stock: cancelled orders, lost customers and the 40% of manual entry that lingers.
iPaaS vs dedicated API: the right choice by volume
iPaaS (integration middleware) appeals for its fast setup, but bills by usage and caps out on business logic. A dedicated API costs more to build and pays off as volumes rise.
| Criterion | iPaaS | Custom dedicated API |
|---|---|---|
| Initial cost | 3,000-10,000 EUR | 12,000-40,000 EUR excl. tax |
| Recurring cost | 500-3,000 EUR/mo | Hosting only |
| Real time | Often batched | Yes, event-driven |
| Error handling | Standard | Fine, automatic replays |
| Complex business rules | Limited | Fully custom |
| 3-year cost (mid volume) | 30,000-60,000 EUR | 25,000-45,000 EUR |
Below a few hundred orders/month, iPaaS is often enough. Beyond that, or with complex price/stock rules, the dedicated API regains the edge.
The hidden cost of desynced stock
The real comparison isn't iPaaS vs API: it's "connected" vs "not connected". 2026 order of magnitude for a B2B store at 2,000 orders/month.
| Problem | Frequency without sync | Estimated monthly cost |
|---|---|---|
| Orders on wrong stock | 3% of orders | 4,800 EUR (cancellations/gestures) |
| Manual ERP entry | 40% of orders | 3,200 EUR (time) |
| Obsolete prices shown | 1.5% of lines | 1,500 EUR (lost margin) |
| Shipping delays | ~60 orders | 1,200 EUR (support) |
| Total avoidable/month | — | ~10,700 EUR |
At that rate, a 25,000 EUR excl. tax connector pays back in under 3 months from eliminating error costs alone.
Mini case study
Take Nadia, e-commerce director of a B2B distributor in Nantes, 2,000 orders/month, 40% re-keyed by hand into the ERP. The real-time connector (26,000 EUR excl. tax) removes manual entry and makes stock and prices reliable. Gain: 800 orders/month automated, i.e. ~130 hours saved at 30 EUR/h = 3,900 EUR/month, plus the end of wrong-stock cancellations (~4,800 EUR/month). Total ~8,700 EUR/month gain, payback in 3 months. Bonus: DSO drops as orders reach fulfillment faster.
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FAQ
How long to connect my store to the ERP?
Expect 5 to 10 weeks depending on your ERP's API maturity and the number of flows (stock, prices, orders, customers, invoices). A stock/orders flow alone can ship in 4-5 weeks.
iPaaS or a dedicated API: which to choose?
iPaaS to start fast with moderate volumes and standard logic. A dedicated API as soon as volumes rise or your price/stock rules leave the standard: it becomes cheaper over 3 years.
What happens if the ERP goes down?
A robust connector queues messages and replays automatically on recovery. No order is lost: that's precisely what custom error handling secures.
Is my ERP (Sage, Cegid, SAP, Odoo) compatible?
Most expose APIs or allow file exchange. Budget varies with the quality of those interfaces: modern ERPs lower the cost, older ones raise it.
Is real time really necessary?
For stock and prices in B2B, yes: a few hours' lag is enough to sell nonexistent stock. For invoices or accounting, a daily batch sync is often enough.
Let's scope your project. Tell us your ERP, order volumes and flows to sync: we'll quote a reliable connector (12,000-40,000 EUR excl. tax, 5-10 weeks). 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.
