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Prompt.Monster
COMMERCE5 experts8 features8-step Mega Chain

Master build prompt for a multi-vendor marketplace

The build prompt for a multi-vendor marketplace with seller onboarding, commissions, split payments, order management and search.

Built for: Founders building niche marketplaces

A marketplace has three sides: buyers, sellers and the platform. Seller onboarding, commissions and split payments, dispute handling and search quality are the complex pieces that decide whether the product succeeds.

This prompt defines the seller dashboard, the platform admin and the buyer experience as separate roles, and adds your payment provider's split/escrow capabilities and GDPR/KVKK obligations to the constraints.

The experts who write this prompt

Each expert adds its own task block, constraints and success criteria to the prompt. Default selection for Multi-Vendor Marketplace:

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Staff Engineer / CTO

12y
ex-Stripe, ex-Vercel • System Architecture

Design the system architecture. Edge-first, 100ms p95. DB schema, API contract, caching strategy, multi-tenancy, RLS, idempotency. Explain why the chosen backend + DB combination is the right call, and write the scaling plan.

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Product Manager

8y
ex-Linear • PRD & Roadmap

Write a flawless PRD. User stories (Jobs-to-be-Done), acceptance criteria, edge cases, metrics (North Star, activation, retention); prioritize the roadmap with RICE. Scope an MVP that ships in 7 days.

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Monetization Strategist

9y
ex-Paddle • Pricing & Packaging

Pricing: Freemium vs. Free Trial, 3 tiers ($19/$49/$149), 20% annual discount, credit system. Hybrid flow with the selected payment providers. Churn-reduction tactics.

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Security & Compliance

10y
SOC2 Auditor • KVKK/GDPR

Threat model (STRIDE), OWASP Top 10 checklist, auth/session hardening, data classification, GDPR/KVKK compliance map (data inventory, retention periods, deletion flow), audit log schema.

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SEO/AEO Strategist

7y
AI Search Pioneer • Perplexity Ranking

AEO + SEO: programmatic SEO pages, schema.org, optimization for Perplexity / ChatGPT Search, internal linking, waitlist -> launch playbook.

Recommended stack

Preloaded in step 2 of the Studio; change any of the 7 layers.

  • Next.js 16 (App Router)
  • NestJS
  • PostgreSQL + pgvector
  • Better Auth
  • Meilisearch

Payments & revenue model

  • Commission %
  • Subscription (MRR)
  • Stripe2.9% + 30¢

Compliance

  • KVKK/GDPR
  • 3D Secure

Features in the prompt

Every feature appears in the prompt as a "Spec + API + UI + Tests" line.

  • RBAC + Permissions
  • Multi-tenancy
  • Advanced CRUD + Bulk Ops
  • Ratings & Reviews
  • Chat + Video Call
  • Global Search (⌘K)
  • Admin Panel + Impersonate
  • Affiliate System

Sample prompt (shortened)

Sample idea: "A commission-based handmade goods marketplace for local artisans". Below are the master prompt's header and the first expert's block; the Studio generates the full text as 5 experts × 8 steps.

MULTI-VENDOR MARKETPLACE — MASTER BUILD PROMPTClaude XML • EN
# Multi-Vendor Marketplace - MASTER BUILD PROMPT

Stack: Next.js 16 (App Router), NestJS

Goal: A commission-based handmade goods marketplace for local artisans

This prompt builds a full-stack Multi-Vendor Marketplace in 8 steps. Each step consumes the previous step's output. 5 experts' knowledge combined.

Steps:
1. PRD & User Stories
2. Design System (Figma tokens)
3. DB Schema & API Contract
4. Auth & Billing Implementation
5. Core Features Build
6. AI Integration (RAG + Agents)
7. SEO/AEO & Analytics
8. Launch & Growth Checklist

---

<prompt>
<role name="Staff Engineer / CTO" org="ex-Stripe, ex-Vercel" specialty="System Architecture" experience="12y">
You are a Staff Engineer / CTO with 12 years of experience. Specialty: System Architecture. You have shipped world-class products at the level of Stripe, Linear and Vercel.
</role>

<context>
Project: Multi-Vendor Marketplace - A commission-based handmade goods marketplace for local artisans
Type: Multi-Vendor Marketplace
Vision: Seller applications and approval, shop pages, order and shipment tracking, buyer-seller messaging, split payments with an 8% commission, a review system and a dispute flow.
Target user: Founders building niche marketplaces - Pain:  - Budget: 
Competitors: 
USP: 
Monetization: Commission %, Subscription (MRR) | Payments: Stripe
Tech Stack: Next.js 16 (App Router), NestJS, PostgreSQL + pgvector, Better Auth, Meilisearch
Features: RBAC + Permissions, Multi-tenancy, Advanced CRUD + Bulk Ops, Ratings & Reviews, Chat + Video Call, Global Search (⌘K), Admin Panel + Impersonate, Affiliate System
Compliance: KVKK/GDPR, 3D Secure
Lang: EN
</context>

<task>
Design the system architecture. Edge-first, 100ms p95. DB schema, API contract, caching strategy, multi-tenancy, RLS, idempotency. Explain why the chosen backend + DB combination is the right call, and write the scaling plan.
General: production quality, copy-paste ready level of detail.
</task>

<technical_architecture>
- Frontend: Next.js 16 (App Router) - App Router, Server Components, partial prerendering
- Backend: NestJS - Edge runtime, RPC, zod validation
- DB: PostgreSQL + pgvector - pgvector for semantic search, type-safe ORM, RLS policies
- Auth: Better Auth - Passkeys first, org/team model
- Search: Meilisearch - typo-tolerant, faceted
- Realtime:  - presence, CRDT-ready
Payment flow: Stripe -> Webhook -> Background job -> Entitlement update -> Audit log
</technical_architecture>

<feature_matrix>
- [ ] RBAC + Permissions -> Spec + API + UI + Tests
- [ ] Multi-tenancy -> Spec + API + UI + Tests
…
The rest is in the Studio: every expert block, the feature matrix and the Mega Chain.Generate the full prompt

Mega Chain: a full-stack Multi-Vendor Marketplace in 8 steps

  1. 1. PRD & User Stories
  2. 2. Design System (Figma tokens)
  3. 3. DB Schema & API Contract
  4. 4. Auth & Billing Implementation
  5. 5. Core Features Build
  6. 6. AI Integration (RAG + Agents)
  7. 7. SEO/AEO & Analytics
  8. 8. Launch & Growth Checklist

FAQ

How are split payments handled?

The prompt calls for Stripe Connect (or the Iyzico Marketplace model in Turkey) and defines payment, commission deduction and payout to the seller as a state machine.

How detailed is seller onboarding?

Application, document verification, store setup and first-product steps are all covered in the Product Manager persona's user stories.

Which tools can I paste the generated prompt into?

Claude Code, Cursor, Windsurf, v0, Lovable, Bolt and ChatGPT. You pick the output format (Claude XML, ChatGPT Markdown, Cursor Rules, v0, Lovable/Bolt) in step 4 of the Studio, and you can also download it as .cursorrules or CLAUDE.md.

Is it free?

Yes. On the Free plan you generate unlimited prompts with 3 experts and 2 formats — no card required. 18 experts, the Mega Chain and Export to Builders come with Monster Pro ($29/mo).

Similar project types

All project types

Turn your Multi-Vendor Marketplace idea into a master prompt in 4 steps.

Experts, stack and features come preloaded like on this page — you add the name and the idea. Free, no card required.