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.
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.