The marketplace engine you fully own
The complete engine a marketplace runs on that stays yours, forever. Open at the core & running on your own infrastructure, with zero GMV fees.
Three ways to run a marketplace
Two of them make you give something up.
Rent it
A hosted platform
Fast to start. But you pay a percentage of everything you sell, and your stack lives on someone else's terms.Gives up:MarginStack
Build it
Your own engine, from scratch
Full control. But it takes years to get right, and the maintenance never ends.Gives up:YearsUpkeep
Own it
Mercur
The open-source engine, running on your infrastructure. You keep the hard part already built – and you keep the code.Gives up:Nothing structural
We built this because we kept needing it
Mercur comes from Rigby, a commerce engineering team. We built marketplaces from scratch, in production, for years – and hit the same wall every time. The tools force a choice: rent a platform that takes a cut of your revenue and locks in your stack, or build the whole engine yourself and own the maintenance forever.So we open-sourced the hard part – the marketplace engine underneath – and kept it yours to run. The complex machinery is free and readable. What we sell is the layer on top: the trust, the financial control, and the guarantees that a serious marketplace runs on.
The name you compare Mirakl against
Not a cheaper Mirakl – a different class of product. The incumbents are closed, hosted, and priced on your growth. Mercur is open, self-hosted, and yours. We're building it so that on the criteria that actually decide these projects, the honest comparison lands our way more and more often.ownershipcost modelflexibilitycompliance
| SaaS Marketplace | Mercur | |
|---|---|---|
| Core technology | Closed, vendor-only | Open source (MIT), public |
| Enterprise code | Black box | Full source access for licensees |
| Integrations | Separate products and platforms | Built into one platform |
| Customization | Tickets and workarounds | Official extension points, your own layer |
| Deployment | Vendor cloud only | Any cloud or on-premise |
| Cost model | A percentage of your GMV | Zero GMV fees |
| Exit scenario | Lock-in | You keep what you paid for |
| Developer pool | Certified specialists | Any web developer |
Start on open source.
Scale on enterprise.
Mercur is built on Medusa v2, so any Node.js developer can work with it. Every capability is either running in the open-source engine today, or clearly labeled as roadmap. Nothing is a black box.
Your layer
You own it outright. Build your unique logic on official extension points – your customizations live here, so upgrades never overwrite your work.
Mercur Enterprise
The production layer for money, compliance, and scale. Fully source-available to licensees, extensible at its own seams. Nothing here is a black box.
Mercur Open Source
A complete, working multi-vendor core on Medusa v2 – vendors, split orders, commissions, payouts, catalog, offers. Inspected and pressure-tested by a global developer community.
Built by a team that develops marketplaces for leading brands
Mercur was built by Rigby – people who have spent 5+ years building and launching marketplaces in production. And because you own the code, working with us is a choice, not a lock-in.
Marketplaces built on Mercur
Material Index
Material Index lets contractors, architects and developers buy and sell reclaimed materials, live in the UK and licensed in Australia, the USA, and Spain.
Suplement.io
Suplement.io equips supplement brands with EU-based manufacturing – ready-to-brand products, private-label formulation and compliance – in 20+ EU countries.
Skylum
Skylum extended its eCommerce with a creative marketplace for 800+ editing assets made by world-class photographers and artists.
See it running, then read the code
Book a walkthrough and we'll map Mercur to your marketplace. Or start in the source – it's all open.