The marketplace platform you actually own
Two editions, one engine. Mercur Open Source is the complete marketplace core – MIT-licensed and public. Mercur Enterprise is the same engine, extended and operated for companies running real payments, compliance, and scale in production.
One engine in three layers
Mercur is not a product with a free tier and a paid tier. It is one engine in three layers – and you can see exactly where each one begins.
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 payments, 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 – vendors, splits, commissions, payouts, catalog, offers. Inspected and pressure-tested by the global developer community.
Everyone knows exactly what belongs to whom. Run on Open Source alone, or license Enterprise when you are putting real payments and compliance into production. Either way, the foundation – and your code – stay yours.
The full engine in the open
Open Source is not a teaser or a trial. It is a complete, working multi-vendor marketplace engine – and the code is public, so you can judge the architecture before you ever talk to us.
Vendors
Full vendor lifecycle, multi-user stores, and team roles.
Orders
Multi-vendor carts that split into per-vendor orders, from a single customer payment.
Payments
Rule-based commissions with an audit trail, and vendor payouts via Stripe Connect.
Catalog
Per-vendor catalog with custom attributes and fields, offers, and pricing.
Operations
Shipping, fulfillment, inventory, returns, and promotions, scoped per vendor.
Developer platform
Registry blocks you copy into your repo, a dashboard SDK, a typed client, a CLI, and a one-line plugin.
It is MIT-licensed, and it stays that way – no relicensing surprises, no black box. Any web developer can read it, run it, and extend it.
GitHubWhere Open Source ends and production begins
A complete engine is the starting line, not the finish. The companies we work with arrive with a checklist. Here is what it asks for – and where each item lives.
| What an enterprise RFI asks for | Open Source | Enterprise |
|---|---|---|
| Multi-vendor 3P, split orders & payments, commissions, vendor portal, API-first headless core | ||
| Settlement that matches the books, balances that equal real payouts, an append-only ledger | ||
| EU compliance: GDPR & data residency, Omnibus price history, tax codes & invoicing | ||
| Enterprise SSO (SAML / OIDC), native MFA, an audit trail – including a log of every data export | ||
| Integrations into your stack: ERP, PIM, OMS, and storefront connectors | ||
| A decision layer: a BuyBox with rules, an approval and command center | ||
| An SLA, disaster recovery, long-term support, and a clean exit |
These are the parts that carry real liability: moving money correctly, answering to regulators, and proving what happened when asked. They need a clear owner – maintained, supported, and accountable. That is Mercur Enterprise.
The same engine ready for production
Enterprise is the production layer. It adds five things to the core.
Financial control
An append-only ledger, real vendor balances, statements, invoicing, and settlement.
EU-first compliance
Omnibus price history, tax and invoicing, GDPR and data residency – captured by the data model from the first transaction.
Trust & risk
KYC/KYB, an immutable audit trail, granular role-based access, enterprise SSO and MFA.
Integrations
A connector framework for your stack: ERP, PIM, OMS, storefront platforms, and vendor feeds.
Support & operations
An SLA, maintenance, a published reference architecture, and deployment on any cloud, on-prem, or air-gapped.
One suite available in two editions
What the open source engine already runs, and what Enterprise adds on top of it.
Open source · MIT
Mercur Open Source
The complete marketplace engine, public and yours to run:
- Vendor onboarding, accounts, teams and management
- Catalog, master products, offers, pricing and inventory
- Multi-vendor checkout, order splitting, shipping and returns
- Split payments, payouts, commission and refunds
- Promotions, campaigns, reviews and workflows
- RBAC, a typed API, and the admin and vendor dashboards
- MIT-licensed and self-hostable, with full code ownership
Enterprise
Mercur Enterprise
Everything in Open Source, plus the layer a business in production needs:
- Double-entry ledger, reconciliation and payout cycles with AML
- Buy Box engine, EAN matching and deduplication
- AI data enrichment and category auto-matching
- Import framework and connectors to Magento, ERP and PIM
- Delivery tracking, dispute management and complaint routing
- Seller scoring and seller CRM
- Compliance layer, audit log, SSO and data controls
- Operational analytics with financial-health alerts
Every module is a standard module, extensible at its own seams – events, hooks, providers, overridable pages. 50+ modules · one platform.
Nothing here is a black box.
What Enterprise is for
Enterprise is for putting a marketplace into production: real payments, real regulators, real scale. The code is yours either way. What you license is a team that keeps that layer correct, maintained, and accountable.
No lock-in by design
The biggest fear with any licensed software is getting trapped. Mercur is built so you can't be.
A license that never holds you hostage
Verified fully offline – no phone-home, no license server, so air-gapped is first-class. A license issue never stops production; worst case you lose updates, not your running marketplace.
You keep what you paid for
Licensees read and audit every line. If our cooperation ends, you keep the versions you paid for and everything built on them – your data, infra, customizations. You lose updates and support, never your business.
You can fork the core
Walk away to the open-source engine anytime. A license buys a maintained, SLA-backed finance & compliance layer – and the team that keeps it correct.
Why this architecture wins
Side by side with a traditional marketplace SaaS.
| 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 |
Take it to production
Tell us what you are building and we will walk you through Mercur Enterprise for your business — the engine, the editions, and what running it on your own infrastructure looks like.
What we will cover:
- Where the Open Source engine ends for what you are building.
- The Enterprise layer against your requirements – ledger, compliance, integrations, support.
- Deployment and licensing: any cloud, on-premise or air-gapped, with zero GMV fees.