Foundation Base
Production readyDeveloper Toolsv1.0.0 · updated Jul 1, 2026
MK

Open Source Marketplace template

Listings, discovery, detail pages, and trust signals.

A marketplace storefront foundation for curated catalogs, searchable listings, detail pages, and buyer confidence.

Runnable Agent-ready Install-ready Deploy-ready
foundationbase.app/demo/marketplaceOpen full demo →

This is the real app, not a mockup. Whatever you enter in the demo stays in your browser and belongs to nobody.

What you get

One zip. Everything to own it.

Marketplace Foundation gives builders the parts that make a curated catalog feel trustworthy: browse pages, listing cards, detail pages, verification metadata, submission-ready structure, and search primitives. It is designed for marketplaces where clarity and confidence matter more than volume.

  • Listing catalog and searchable grid
  • Foundation detail pages
  • Trust and readiness metadata
  • Submission-ready data model
  • Future payments and creator account seams
marketplace-foundation.zipMIT
marketplace-foundation/├── app/the running Next.js app├── agent/START_HERE, PROJECT_MAP, RULES, RECIPES, TESTS, DEPLOY├── CLAUDE.mdread automatically by Claude Code├── AGENTS.mdread automatically by Codex├── .cursor/rules/loaded automatically by Cursor└── README.mdrun it, then make it yours

Inside the app

What the running app actually looks like
Marketplace Foundation: Catalog grid
Catalog grid — Searchable listings with category, stack, trust, and freshness signals.

Customize with AI

Your agent already knows this codebase.

Agent docs identify listing schema, routing, filtering, and future API replacement points.

CodexClaude CodeCursor

Prompts written against this app

Change the branding, copy, and layout for my Marketplace Foundation app.
Add or remove fields so it matches my workflow.
Add export and import for my developer tools data.
Add optional sync later without changing the local-first default.

Run it

5 min to your own copy.

  1. 01Create your editable app copy and unzip it.
  2. 02Run npm install.
  3. 03Run npm run dev and open http://localhost:3000.
  4. 04Read /agent/START_HERE.md before customizing.
  5. 05Swap the local-first storage boundary for your own backend when ready.
Full walkthrough, including deploy and install →
Where your data lives

Marketplace Foundation data stays in this browser by default.

No account, backend, or cloud sync is included in the current package.

An agent can add optional sync later while preserving the local-first default.

Honest limitation

This package is standard-ready for Create My App and AI customization.

A full app-only PWA install route is not enabled yet for this app.

Verification receiptchecked Aug 2, 2026 at c11c184 · v1.0.0
Demo renderscaptured 2026-07-26, 55 KBpassed
Package installs and buildsinstalled, typechecked and built in 109s on node v24.13.0passed
Source package complete31 files, 75 KBpassed
Agent instructions included5 handoff files presentpassed
No network calls in app sourcestatic scan clean: no network calls, eval, or secrets in app sourcepassed
License matches the packageMIT, matching the file in the packagepassed

If this isn’t quite right

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Take Marketplace Foundation and make it yours.

Free, MIT, 5 min to running. The demo above is exactly what lands in your folder.

Create My AppTry demo
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