Integrating Your ERP API for a Real-Time Website Catalog in 2026

The verdict in three sentences

A web catalog disconnected from the ERP lies about stock and price, driving cancelled orders and support calls. A real-time API integration (or near real-time via middleware) aligns the site with the operational source of truth for 12,000 to 40,000 EUR depending on how many flows you sync. The hard part isn't the connector itself but its idempotency, error handling and monitoring: that's what separates a project that holds from one that drifts.

What an ERP connector really costs in 2026

Price depends on the ERP, the number of flows and whether a standard API exists. SAP and Dynamics expose modern REST/OData APIs; older Sage systems often force a middleware or intermediate exports. 2026 ballpark for the European market.

Add the middleware subscription if you use an iPaaS (Make, Boomi, Talend): 150 to 900 EUR/month by call volume. Annual maintenance runs 15 to 20% of the development cost.

Which flows to sync, and how often

Not everything needs to be real-time: stock yes, product sheets no. Calibrating frequency per flow avoids hammering the ERP API and paying for useless calls.

For stock and price, prefer an on-demand call with a short cache (10 to 60 s) over a mass sync: the customer sees accurate data right at checkout without pounding the ERP.

Reliability: idempotency, retries and monitoring

A serious connector guarantees that an order sent twice doesn't create two orders (idempotency key), that a failed call is retried with back-off, and that a queue absorbs spikes. Plan an error dashboard and alerts: without monitoring, a silent API outage freezes the catalog for hours.

Mini case study

Thomas, sales director of an industrial supplies distributor in Lyon (2,400 SKUs, Sage 100 ERP), lost about 35 orders/month cancelled for unreported shortages, wasting an average 280 EUR basket. The stock + price connector cost 21,000 EUR plus 220 EUR/month of iPaaS. By killing 90% of cancellations he recovers ~9,800 EUR of revenue per month and 12 hours/month of support time: payback in a little over 2 months.

FAQ

Do I always need middleware? No, if the ERP exposes a clean, well-documented REST API. Middleware becomes useful once you orchestrate several systems or an ERP with no modern API; expect 150 to 900 EUR/month then.

Real-time or scheduled sync? Stock and price real-time (or cache < 60 s), sheets and media as a nightly batch. Making everything real-time costs more and strains the ERP for zero benefit on stable data.

What happens if the ERP goes down? A good connector shows the last known value with a freshness indicator and queues orders. Automatic retry replays calls as soon as the service returns.

How long for a first flow? A stock-only flow on an ERP with an API ships in 6 to 8 weeks, testing included. B2B multi-tier catalogs on SAP reach 14-18 weeks.

What maintenance budget should I plan? Between 15 and 20% of development cost per year, to track API updates, new fields and monitoring.

Let's scope your project. Tell us your ERP, the number of SKUs and priority flows (stock, price, orders): we'll price the connector, any middleware and the test plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.