How much does a MedusaJS implementation cost in 2026?

MedusaJS v2 is open-source - you pay no SaaS license or GMV take-rate. Implementation cost is team effort: Next.js storefront, B2B modules, integrations and data migration. The more systems beside commerce (ERP, PIM, WMS, CRM, B2B payments), the higher the budget and longer the discovery timeline.

The commerce model matters. Pure D2C with one warehouse and standard checkout is a different scope than B2B with contract pricing, credit limits, order approval workflows and marketplace split checkout. Every extra business rule is a custom module or order lifecycle extension.

Channel count adds cost too: web, React Native app, maybe POS or partner portal - all should share one Medusa API, but each channel is a separate front and regression surface. Data quality when migrating from Magento or legacy ERP often adds 20-30% effort for catalogue cleanup and attribute mapping.

Competing articles often reduce Medusa implementation cost to “Medusa is open source, so there is no license”. True, but not enough for a budget decision. Real cost sits in discovery, module architecture, storefront, integrations and post-launch operation.

Official Medusa Cloud pricing helps estimate platform infrastructure cost: plans are public, and the model does not charge a GMV platform fee. But that is not full project cost, because most effort sits in commerce logic: catalogue, cart, payments, taxes, B2B pricing, user roles, data import and ERP connections.

That is why GMI does not promise one number before DDT. An initial range within 48h is useful for the “do we have budget for this class of project?” decision. Fixed price makes sense only after scope, data, integrations, risks and acceptance criteria are known.

Initial estimate after a first call and short brief: 48h, budget range with no commitment. A full fixed-price offer requires DDT (Discovery, Design and Technology): business and IT workshops, data audit, clickable UX mocks for critical flows (B2B checkout, company account onboarding) and an architecture diagram with an integration list.

DDT usually runs 1-3 weeks and ends with a scope document plus a fixed-price offer for agreed work. This is not open-ended T&M with surprise invoices, but it is also not a price promise before risks are known.

What falls outside fixed price without a separate quote: business changes after scope sign-off (new markets, new marketplace model), integrations unknown at DDT, and product content/copy. We price those via transparent change requests.

Cloud infrastructure (AWS, GCP): EUR 300 - 2,000/month depending on traffic and environments (staging, prod, DR). Medusa does not need expensive managed hosting, but production B2B with ERP integrations needs monitoring, backups and autoscaling for peaks.

Post go-live run cost: 15-25% of initial build per year with active product development (new features, compliance, Medusa upgrades). On a stable store with few iterations you can land at 10-15% - SLA, security patches, dependency updates.

Data migration and regression testing are often under-estimated. Importing 50k SKUs with bad attributes, duplicate EANs and legacy B2B price lists can add 4-8 weeks of analyst and developer time. Better to surface that in DDT than discover it in sprint 3.

Observability cost should also be named before launch: logs, alerts, backups, queue monitoring, checkout tests and rollback plan. In commerce, the expensive failure is not a larger server bill; it is invisible order failure during a campaign.