Marketplace app builder

You build it by describing it, not by wiring together screens and a database yourself. Base44 is a no code marketplace builder: you tell it what your marketplace connects, and it generates the listing pages, roles and admin view together, in one data model.

Concretely, that walkthrough looks like this:

• Define the listing entity – decide what a single listing needs (title, price, category, images, availability) and Base44 creates the database structure and the form sellers use to create one.
• Split buyer and seller into two roles, not two apps – each role gets its own permissions and its own view of the same underlying data, so a seller only ever sees and edits their own listings.
• Put moderation in the admin view, not in the seller's hands – new sellers or new listings can require admin approval before they're visible to buyers, which is where you catch problems before they ever go live.

From there you're refining in chat: add a filter, add a message thread, change what a listing requires, instead of filing a ticket with a developer. If you want the long version with screenshots, how to make a marketplace app covers the whole build end to end.

Sellers onboard the same way any user does: they sign up, and Base44 assigns them the seller role, which comes with its own permissions and its own view of the data. From there, a seller's listings are scoped to their account — they can create, edit and manage their own catalog, but they can't see or touch another seller's records.

• Approval gates – new seller accounts, or a seller's first listing, can require admin approval before anything goes live to buyers.
• The admin dashboard – is where you review pending sellers, edit or unpublish a listing that breaks your rules, and see activity across the whole marketplace in one place.
• Profile fields – you decide what a seller profile shows buyers (a bio, a verification badge, location, response time), and Base44 builds the form and the public view together.

None of this requires a separate seller-facing app; it's the same marketplace app, scoped differently by role.

People create an online marketplace for almost any two-sided business; the structure just shifts slightly depending on what's actually changing hands.

• Services marketplaces – connect providers (tutors, freelancers, contractors) with people booking their time, so the core listing is a service and availability, not inventory.
• Rental marketplaces – track an item or space's availability calendar and condition between rentals, alongside the usual listing and payment flow.
• B2B marketplaces – often need company-level accounts (multiple team members under one buyer or seller), quotes instead of fixed prices, and longer approval chains.
• Niche and vertical marketplaces – narrow the category on purpose (handmade goods, a specific hobby, a local region), which usually means a simpler listing schema than a general marketplace needs.
• Food delivery marketplaces – add real-time order status and often a third role, the courier, on top of buyer and seller.

The buyer-seller-payment core is the same across all five; what changes is the listing schema, the roles involved, and what "completed" means for an order.

Google and AI answer engines find your marketplace the same way they'd find any other page: through content, links and machine-readable signals. A two-sided marketplace actually has more of its own content working in its favor than a single-owner site does.

E-commerce is already 16.9% of US retail sales, $326.7B in Q1 2026 alone, up 9.8% year over year, and buyers increasingly start that search on Google or inside an AI assistant rather than going straight to a marketplace they already know. That means every listing your sellers publish is a chance to get found for a specific product, service or location someone is actually searching for — whether they're looking for a marketplace platform, an online marketplace builder, or the exact thing one of your sellers offers.

• Listings are pages, not just database rows – each one carries a title, description and images that can rank on their own.
• Connect a custom domain – once your marketplace runs on your own domain, you can publish an llms.txt file that tells AI crawlers what your site is and how to reference it.
• Structured data ships with the page – Base44 injects page and breadcrumb markup automatically, and the SEO & GEO scan can generate FAQ and organization schema for your pages with one click — the machine-readable signals AI answer engines look for.

The more real listings and reviews your marketplace accumulates, the more of that discoverable content compounds; it's a growth lever a two-sided marketplace has that a single storefront doesn't.