The verdict in three sentences
Each integration of a custom platform in Toronto costs 3,000 to 15,000 USD depending on API complexity (REST, SOAP, webhooks, ETL) and source reliability. An API-first architecture from the start drastically cuts the cost of future connections. The real hidden cost is not integration but non-integration: double entry, errors and inconsistent data that cost hours every week.
How much each integration type costs
Not all APIs are equal. A well-documented modern REST API integrates fast; an old SOAP system or a closed ERP demands far more effort.
| Integration type | Example | Complexity | Budget |
|---|---|---|---|
| Documented REST API | Modern CRM, Stripe | Low | 3,000-6,000 USD |
| Real-time webhooks | Notifications, sync | Medium | 4,000-8,000 USD |
| SOAP / legacy API | Old ERP, public service | High | 8,000-15,000 USD |
| ETL / batch | Migration, reporting | High | 6,000-12,000 USD |
| Closed ERP connector | SAP, on-prem Oracle | Very high | 12,000 USD and up |
On top of this comes connector maintenance: 10 to 20% of the integration cost per year, because APIs evolve, change versions and can break a sync.
iPaaS or custom connector: how to decide
An iPaaS (Zapier, Make, n8n) connects standard tools fast; a custom connector is more robust for high volumes and fine business rules.
| Criterion | iPaaS | Custom connector |
|---|---|---|
| Setup cost | 500-3,000 USD | 3,000-15,000 USD |
| Monthly cost | 30-500 USD/month | Maintenance only |
| Volume supported | Low to medium | High |
| Complex business rules | Limited | Unlimited |
| Reliability / SLA | Depends on third party | Controlled |
| Best for | Prototypes, low volumes | Production, high volumes |
Simple rule: start on iPaaS to validate the need, switch to a custom connector as soon as volume or criticality rise. The cost of non-integration quickly justifies the investment.
Mini case study
Nadia, admin director at a 75-person logistics SME in Toronto, enters every order three times: in the platform, in the ERP and in the billing tool. Result: 9 hours/week of re-entry and 3% billing errors. Kolonell builds two custom connectors (ERP + billing) for 19,000 USD, with webhook synchronisation. Gains over 12 months: 9 hrs/week at a loaded cost of 40 USD, i.e. 18,700 USD/year, plus the near-elimination of billing errors that caused credit notes and customer time. Payback in 13 months, excluding quality gains.
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FAQ
What is an API-first architecture?
It means designing the platform to expose and consume APIs from the outset. Each new integration then becomes faster and cheaper, because the foundations are built to communicate.
How much does an ERP integration cost?
From 3,000 USD for a modern REST API to over 12,000 USD for a closed ERP like SAP or on-prem Oracle. API documentation and openness determine the price.
iPaaS or custom connector?
iPaaS suits validating a need or low volumes (30 to 500 USD/month). A custom connector becomes cost-effective as soon as volume, criticality or business rules increase.
What does connector maintenance cost?
Count 10 to 20% of the integration cost per year. APIs evolve and change versions: an unmaintained connector eventually breaks the sync.
How do I quantify the cost of non-integration?
Add up double-entry hours and error costs (credit notes, delays, disputes). For most of our clients this exceeds the integration cost within 18 months.
Let's scope your project. List the tools to connect (ERP, CRM, billing), the volumes and your deadline: we will cost each integration and the API architecture. 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.
