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Open-Source Ecommerce · mercurjs

mercur

Mercur is an open-source, self-hosted marketplace platform built on top of Medusa.js that enables operators to run multi-vendor B2B and B2C marketplaces without SaaS fees or platform lock-in. It includes vendor onboarding, catalog management, commission handling, and automated payouts as built-in features.

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Source: GitHub — github.com/mercurjs/mercur

1.6k

GitHub stars

400

Forks

TypeScript

Primary language

MIT

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	mercurjs/mercur
Owner	mercurjs
Primary language	TypeScript
License	MIT — OSI-approved
Stars	1.6k
Forks	400
Open issues	15
Latest release	v2.1.6 (2026-06-05)
Last updated	2026-07-08
Source	https://github.com/mercurjs/mercur

What mercur is

TypeScript/Node.js monorepo providing a modular, API-first marketplace engine (Mercur Core) layered on Medusa's commerce primitives, with independently deployable admin panel, vendor panel, and storefront components. Uses PostgreSQL, Redis, React, and Vite; event-driven, headless architecture designed for AI-assisted development.

Quickstart

Get the mercur source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/mercurjs/mercur.git2cd mercur3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Multi-vendor B2B/B2C Marketplaces

Ideal for operators who need vendor onboarding, multi-vendor catalogs where multiple sellers offer the same product, commission management, and payout automation without per-transaction platform fees.

Self-hosted, Data-sovereign Operations

Organizations requiring full control over marketplace data, infrastructure, customer relationships, and roadmap can deploy on their own servers, Kubernetes clusters, or managed cloud without vendor lock-in.

Custom, Headless Commerce Storefronts

Teams building branded or specialized customer experiences can extend Mercur via APIs and composable architecture without forking core, integrating with existing frontend stacks (React, Next.js, custom UIs).

Implementation considerations

Requires Node.js ≥20.x, PostgreSQL ≥13.x, and Redis; plan for containerization, container orchestration, and persistent storage setup.
Monorepo structure and modular architecture mean admin panel, vendor panel, and storefronts must be deployed separately; coordinate deployment pipelines.
Event-driven design and composable API-first approach necessitate clear understanding of marketplace workflows (vendor onboarding, offer/commission logic, payout rules) before customization.
Stripe Connect payout integration is built in; other payment and payout providers require custom integration via the API.
No built-in vendor KYC, EAN deduplication, or buy-box logic in open-source core; plan for in-house development or Mercur Enterprise license if these are critical.

When to avoid it — and what to weigh

Minimal DevOps/Infrastructure Appetite — Requires PostgreSQL, Redis, Node.js runtime, and container orchestration knowledge. Not a zero-ops SaaS; self-hosting demands infrastructure ownership and operational responsibility.
Simple Single-vendor Ecommerce — Mercur's multi-vendor and marketplace-specific features are overhead if you only need a basic product catalog and checkout. Consider lighter commerce solutions for straightforward use cases.
Immediate, Production-grade Enterprise Features — Advanced modules (EAN deduplication, Buy Box engine, vendor KYC, multi-channel sync) are part of Mercur Enterprise, not included in the MIT-licensed open-source core. Requires separate license and subscription.
Non-technical Operations Teams — Admin and vendor dashboards are included, but deployment, customization, and integration require technical engineering. Not suitable for non-technical operators without dedicated eng support.

License & commercial use

Licensed under MIT (MIT License), a permissive open-source license allowing commercial use, modification, and distribution with minimal restrictions. Source code is fully accessible.

MIT license permits commercial use and self-hosting without per-transaction or percentage-of-GMV fees. However, advanced enterprise features (EAN deduplication, vendor KYC, multi-channel sync) are part of Mercur Enterprise and require a separate commercial license and subscription. Verify Enterprise licensing terms directly with the Mercur team before relying on those features in production.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Strong
Assessment confidence	High

Security considerations

Data owned and controlled by operator (self-hosted). No proprietary runtime or vendor-managed security audit details provided in data. Operators are responsible for PostgreSQL, Redis, Node.js, and infrastructure security hardening. Stripe Connect integration relies on Stripe's security for payouts. No explicit vulnerability disclosure policy or security audit log provided; requires review before production deployment.

Alternatives to consider

Medusa.js (Core Commerce)

Lighter-weight, single-vendor e-commerce foundation; Mercur builds on top. Use if multi-vendor complexity is not needed.

Shopify Plus / WooCommerce Multivendor Plugins

SaaS or managed solutions with vendor lock-in and transaction fees, but less infrastructure overhead and vendor-managed security. Choose if operational simplicity outweighs cost.

Sharetribe / Arcadier (SaaS Marketplaces)

Fully managed, turnkey marketplace platforms with built-in vendor features; no self-hosting required. Trade off data sovereignty and customization for faster time-to-market.

Software development agency

Build on mercur with DEV.co software developers

Mercur is production-ready and self-hosted. Get started with `bun create mercur-app@latest`, review the docs, or book a demo with the Rigby team for enterprise features and professional services.

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Related open-source tools

Surfaced by semantic similarity across the DEV.co open-source index.

medusa saleor-dashboard idurar-erp-crm

Related on DEV.co

Explore the category and the services that help you build with it.

Open-Source Ecommerce Ecommerce Development API Development Cloud Deployment & DevOps Talk to DEV.co

mercur FAQ

Is Mercur free to use?

The core marketplace engine is open-source under MIT license and free to self-host. Advanced enterprise modules (EAN deduplication, vendor KYC, etc.) require a separate Mercur Enterprise subscription.

Do I own my data and marketplace?

Yes. Self-hosted on your infrastructure with full source access. No per-transaction cuts, no GMV percentage fees, and no vendor lock-in. Your data, customers, and roadmap remain yours.

What's the difference between the open-source core and Mercur Enterprise?

Core includes vendor onboarding, multi-vendor catalogs, commissions, and payouts. Enterprise adds advanced features (EAN matching, Buy Box engine, vendor KYC, multi-channel sync) and comes with dedicated support, SLAs, and prioritized patches.

How hard is it to deploy and operate?

Requires Node.js, PostgreSQL, Redis, and infrastructure (containers or Kubernetes). Not a zero-ops SaaS. If you have engineering and DevOps resources, deployment is straightforward; without them, consider managed options or Mercur Enterprise support.

Work with a software development agency

Standing up mercur properly takes more than a deploy. As a software development agency, DEV.co handles the open-source ecommerce architecture, the web development on top, and the operational work underneath.

Ready to build your marketplace?

Mercur is production-ready and self-hosted. Get started with `bun create mercur-app@latest`, review the docs, or book a demo with the Rigby team for enterprise features and professional services.

Talk to DEV.co Schedule a Consultation