Custom E-commerce vs Marketplace: When to Build Your Own
Complete analysis between owning your store or selling on marketplaces: fees, control, branding, SEO, scalability and when each option makes sense. With comparison table and cost analysis.
The Dilemma of Every Digital Retailer
Sell on Mercado Livre or have your own store? Marketplaces generate high volume, but fees eat into margins. Your own store gives more control, but you need to drive traffic. And what about the cost of developing a custom e-commerce platform — is it worth the investment? This guide analyzes both options objectively to help you make the right decision for your business.
Brazilian Marketplace Reality
Brazil has a mature and dominant marketplace ecosystem. In 2026, major players include Mercado Livre (~500M monthly visitors, 10-17% commission), Shopee (~300M, 4-12%), Amazon BR (~150M, 8-15%), and Magazine Luiza (~100M, 12-18%). These numbers are impressive — a new seller on Mercado Livre gets immediate access to hundreds of millions of potential buyers with zero marketing investment.
Marketplace Pros and Cons
Advantages: ready-made audience, payment infrastructure (checkout, fraud prevention, disputes), integrated logistics (Mercado Livre Full, Amazon FBA), credibility by association, and zero initial cost.
Disadvantages: commissions consuming 10-20% of revenue (plus advertising costs totaling 25-35% of gross revenue), you don't own the customer relationship or their data, price wars with competitors on the same page, zero branding control, strategic dependency on platform policy changes, and limited data access.
Full Comparison Table
| Criterion | Marketplace | SaaS E-commerce | Custom E-commerce |
|---|---|---|---|
| Initial cost | Zero | R$ 100-2,000/month | R$ 80,000-400,000 |
| Commission per sale | 10-20% | 1-2% + gateway | Gateway only (2-4%) |
| Data control | None | Partial | Total |
| Branding | None | Limited | Total |
| Scalability | Platform-limited | Medium | Unlimited |
| ERP integration | Basic APIs | Plugins/APIs | Fully customizable |
| Long-term SEO | Zero (theirs) | Medium | High |
| Business logic flexibility | Zero | Medium | Total |
| Time to first sale | Days | Weeks | Months |
When to Build Custom E-commerce
- Your own marketplace (multi-vendor): no generic SaaS platform solves this — you need seller onboarding, commission management, payment splitting, and rating systems;
- Complex business logic: product configurators, dynamic pricing by customer segment, subscription with custom pause/skip rules, B2B checkout with credit limits;
- Volume justifies it economically: typically at R$ 5-10M+ annual online revenue, marketplace fees plus SaaS costs exceed the annual cost of a proprietary solution.
Development Cost Analysis
| Type | Description | Timeline | Estimated Investment |
|---|---|---|---|
| Custom Online Store | Catalog + checkout + payments + admin panel | 3-5 months | R$ 80,000 - R$ 180,000 |
| E-commerce with Mobile App | Web store + iOS/Android + integrations | 5-8 months | R$ 180,000 - R$ 380,000 |
| Multi-vendor Marketplace | Platform with multiple sellers + payment splitting | 8-12 months | R$ 350,000 - R$ 700,000 |
| B2B Enterprise E-commerce | Custom catalog + approval workflow + ERP | 8-14 months | R$ 400,000 - R$ 900,000 |
FWC Tecnologia has developed e-commerce platforms and marketplaces for retail, industry and services clients. Request a quote for a specific analysis of your case, or read our guide on how to start with an MVP before full investment.
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