The verdict in three sentences
A data connector (custom or iPaaS) between ERP, CRM and business tools costs in 2026 6,000 to 25,000 EUR to set up, plus 100 to 800 EUR per month. It removes double entry, syncs customers, orders and stock in real time and reaches 99 %+ reliability. The payoff: the end of billing errors that cost 1 to 3 % of revenue and immediate consolidated reporting.
What an integration costs in 2026
Price depends on the number of systems, flow volume and the need for real time. 2026 orders of magnitude for the European market.
| Approach | Scope | Setup (EUR) | Recurring /month (EUR) |
|---|---|---|---|
| Standard iPaaS | 2 systems, catalogued flows | 6,000 to 10,000 | 100 to 300 |
| Advanced integration | 3 to 4 systems, custom mapping | 12,000 to 18,000 | 300 to 500 |
| Bespoke middleware | Real time + business rules | 20,000 to 25,000 | 500 to 800 |
| Exchange platform | Multi-subsidiary, governance | 25,000 to 45,000 | 800 to 1,500 |
The monthly cost covers connectors, API call volume and flow monitoring. Proactive monitoring stops silent failures from corrupting data.
The hidden cost of double entry
Without integration, every data point is re-keyed, and every re-keying introduces errors. 2026 estimate for an SME with 5M EUR revenue.
| Item | Without connector | With connector |
|---|---|---|
| Double entry | 15 h/week | 0 h |
| Order error rate | 4 % | 0.3 % |
| Billing errors | 2 % of revenue | 0.2 % of revenue |
| Reporting delay | 3 days | Real time |
| Stock reliability | 88 % | 99 % |
On 5M EUR of revenue, cutting billing errors from 2 % to 0.2 % protects 90,000 EUR of margin per year, far above the connector's cost.
Mini case study
Sophie, IT director of a 60-person B2B distributor in Bordeaux, deploys a middleware between her ERP, CRM and e-commerce platform for 17,000 EUR + 450 EUR per month. Before, two people spent 15 hours per week re-keying, i.e. 1,560 hours per year at 35 EUR loaded, or 54,600 EUR. The connector reduces that time to near zero and cuts billing credits from 50,000 EUR to 6,000 EUR per year. Total annual gain: over 98,000 EUR for a first-year cost of about 22,400 EUR. Payback in under 3 months.
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FAQ
Custom connector or iPaaS?
An iPaaS (6,000 to 10,000 EUR) is enough for standard flows between 2 known tools. A bespoke middleware (20,000 to 25,000 EUR) is needed as soon as you require real time and specific business rules.
What is the monthly cost?
From 100 to 800 EUR per month depending on API call volume and monitoring level. Proactive monitoring is essential to avoid silent failures.
How much does double entry really cost?
Beyond 10 to 15 h/week of work, it generates 1 to 3 % billing errors on revenue. On 5M EUR, that is 50,000 to 150,000 EUR of exposed margin.
What reliability can be reached?
A well-designed connector exceeds 99 % successful syncs, with automatic retry queues in case of network incidents.
How long to set up?
Budget 3 to 8 weeks depending on the number of systems and the quality of available APIs. A first critical flow can ship in 2 weeks.
Let's scope your project. List the systems to link, your priority flows and your volume: we price setup, recurring cost and reliability gains. 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.
