The verdict in three sentences
A real-time, event-driven synchronisation across several tools costs between EUR 10,000 and 28,000 in Singapore in 2026. Price depends on the number of connected systems, the reliability level (idempotency, retry, exactly-once) and the chosen message queue (Redis, RabbitMQ, Kafka). The real challenge is not sending a webhook: it is guaranteeing no event is lost or processed twice when a system goes down.
What an event-driven architecture costs
Budget is structured around the message queue, the number of producers/consumers and the delivery guarantee. Here are 2026 ranges for the Singapore market.
| Scope | Connected systems | Reliability | Indicative price |
|---|---|---|---|
| Simple webhooks | 2 systems | At-least-once + retry | EUR 10,000 - 14,000 |
| Standard event-driven | 3-4 systems | Idempotency + queue | EUR 14,000 - 20,000 |
| Advanced | 5+ systems | Exactly-once + dead-letter | EUR 20,000 - 28,000 |
| High volume | 5+ + Kafka | Exactly-once + partitions | EUR 28,000 - 45,000 |
The exactly-once guarantee (no duplicates, no misses) nearly doubles the effort versus plain at-least-once: it is the item to arbitrate based on business criticality.
Choosing your message queue
Redis, RabbitMQ and Kafka answer different needs. The table compares the three on a stock/orders sync flow.
| Criterion | Redis (Streams) | RabbitMQ | Kafka |
|---|---|---|---|
| Setup cost | EUR 2,000 - 4,000 | EUR 3,000 - 6,000 | EUR 6,000 - 12,000 |
| Sustained throughput | 5,000 - 20,000 msg/s | 10,000 - 40,000 msg/s | 100,000+ msg/s |
| Ops complexity | Low | Medium | High |
| Retention/replay | Limited | Good | Excellent |
| Hosting/month (2026 order) | EUR 30 - 100 | EUR 50 - 150 | EUR 150 - 500 |
For 90% of industrial SMEs, Redis Streams or RabbitMQ are more than enough; Kafka is only justified beyond tens of thousands of events/second.
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Mini case study
Sarah, COO of a B2B distributor in Singapore (logistics, 55 staff). Stock was synced overnight by batch: stockouts and overselling on 6% of next-day orders. Kolonell delivered an event-driven architecture (RabbitMQ, idempotency, dead-letter) at EUR 19,500 in 8 weeks. Stock is now up to date in under 5 seconds across all channels. Overselling fell from 6% to 0.4%. On 3,000 orders/month at EUR 90 margin, avoiding 168 oversells/month represents ~EUR 15,000/month of disputes and refunds saved. Payback in 6 weeks.
FAQ
What is idempotency and why does it matter? Idempotency guarantees that the same event processed twice yields the same result (no double stock decrement). Without it, a simple retry after a timeout can corrupt your stock: it is the foundation of any reliable sync.
Exactly-once or at-least-once? At-least-once (guaranteed delivery, possible duplicates) + idempotency covers 90% of cases and costs 30 to 40% less. Strict exactly-once is only justified for financial or highly critical flows.
How long for a real-time architecture? Expect 6 to 10 weeks: 1-2 weeks of event design, 3-6 weeks developing producers/consumers + queue, 2 weeks of load and failure testing.
What happens if a consumer goes down? Messages stay in the queue and replay on restart. A dead-letter queue captures permanently failed events for analysis, preventing silent loss even after a 12-hour incident.
What is the monthly maintenance cost? Budget for queue hosting (EUR 30 to 500/month by technology) plus a supervision plan of EUR 500 to 1,500/month for critical 24/7 flows.
Let's scope your project. Tell us the number of systems to sync, event volume and your reliability requirement (at-least-once or exactly-once): we quote between EUR 10,000 and 28,000. 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.
