The marketplace, future-proof project and launch puzzle

Launching a B2B marketplace or directory is one of the most exciting web projects: a scalable digital asset, a recurring business model, a reference position on a market. It's also one of the hardest to scope: bad initial positioning loses 18 months, a bad MVP burns a budget without validating the market.

This article gathers the critical questions to ask before committing to development.

Directory or marketplace?

First fundamental distinction. Both are often confused in initial briefs:

Directory

A platform that lists and organizes actors / products / services of a sector. The visitor finds, compares, consults. The connection happens off-platform (the visitor contacts directly).

  • Typical business model: supplier subscription (to be listed), advertising, paid spotlighting, premium content
  • Examples: Panorama Pub, Yellow Pages, GetApp

Marketplace

A platform that hosts the transaction. The visitor finds, compares, and buys/books directly via the platform. The platform takes a commission on the transaction.

  • Typical business model: commission per transaction (5-25% depending on sectors)
  • Examples: Airbnb, Doctolib, Le Bon Coin Pro

Technical and budgetary consequences

| Aspect | Directory | Marketplace | |---|---|---| | MVP complexity | Medium | High | | Indicative MVP budget | €20-40k | €50-150k | | MVP timeline | 2-4 months | 4-9 months | | Integrated payment | No | Yes (Stripe Connect or equivalent) | | KYC / verification | Light | Strict (depending on regulation) | | Dispute management | Off-platform | On-platform |

The frequent trap: starting as a "marketplace" when a directory is plenty to validate the market. Panorama Pub started as a directory. Once the market is validated and the supplier base is robust, evolving to real transactional matchmaking becomes relevant.

The double-side problem (chicken & egg)

Every marketplace or B2B directory has one common challenge: you need critical mass on both sides (suppliers AND buyers) for the platform to take off. But nobody wants to be the first to register on an empty platform.

Strategies to solve chicken & egg

  1. Start "primed" on the supply side: pre-fill the platform with a supplier base before public launch. Panorama Pub started with hundreds of supplier listings already online.
  2. Deliver value even without transactions: editorial content, comparators, calculators. The visitor has a reason to come even if matchmaking isn't mature yet.
  3. Useful single-player solution: the platform delivers value even to a lone supplier (catalog management, SEO listing, consultation stats). It motivates registration on the supply side without waiting for demand.
  4. Narrow vertical target: focus on a specific sub-market to reach critical mass faster. Better to be the leader of a niche than 12th on a general market.

The 7 questions to settle before dev

1. What is the vacant or poorly served market?

A generalist marketplace on a mature market is almost always doomed. The right angle: a poorly covered market, where current supply is fragmented, where there's no clear reference.

Panorama Pub: directory of promotional product suppliers in France. No centralized directory existed, buyers (agencies, comm services, events) had to cobble together scattered searches. Identified, vacant, sufficiently large market.

2. Who are the buyers and where are they?

Describe the buyers beyond generic personas. How many are they? How do they find their suppliers today? What's their main frustration?

If you don't know how to reach 100 buyers in the 3 months after launch, no matter how perfect the platform is, it won't take off.

3. Who are the suppliers and what do they want?

Same thing. Will suppliers pay? How much? For what value?

On a B2B directory, the test: would you go canvas 20 suppliers in person to convince them to register before the public launch? If not, the platform will struggle to recruit suppliers organically.

4. What is the precise business model?

Too vague: "We'll monetize via advertising / commission / subscriptions." Precise:

  • Subscription Basic €39/month (3 photos, 1 contact), Pro €99/month (unlimited + spotlight)
  • 8% commission per transaction (supplier-paid), free threshold up to €500/month
  • Paid spotlighting: €200/month to appear at top of category X

Without those numbers, we can't tell whether the business model is viable.

5. What volume to reach break-even?

A simple calculation:

Monthly fixed costs (hosting + maintenance + fees) = €800. Average margin per paying supplier = €60/month. Threshold = 14 ongoing paying suppliers. Projected growth = 3 net paying suppliers per month → threshold reached at month 5.

If the calculation gives 6 months, doable. If it gives 18 months, the model or ticket size needs revisiting.

6. What's the critical mass for network effect?

How many suppliers needed for the platform to be useful to a buyer? And conversely, how many buyers before a supplier pays to be there?

These numbers define the viability threshold. Until we reach it, the platform remains fragile.

7. What are the regulatory barriers?

  • If it's a transactional marketplace, check KYC obligations, anti-money-laundering, tax (VAT, DAC7 declarations)
  • If you handle sensitive data (health, finance, minors), plan specific compliance
  • If you operate internationally, consider GDPR for European users

These dimensions can double the initial budget if not anticipated.

Technical fundamentals of a B2B marketplace

Data model

At minimum:

  • Users (with roles: admin, supplier, buyer, visitor)
  • Suppliers / advertisers (companies with listing, contacts, metadata)
  • Offers / products / services (what's listed)
  • Categories / taxonomies (often hierarchical, sometimes multi-axis)
  • Requests / contacts (who asks what to whom)
  • Statistics (views, clicks, conversions per listing)

For a transactional marketplace, add:

  • Transactions / orders (with statuses, payment, delivery)
  • Disputes
  • Reviews / ratings
  • Financial movements (commissions, payments, refunds)

It's the functional core of a marketplace. Slow, imprecise or poorly thought-out search kills usage. Criteria:

  • Full-text search with relevance scoring
  • Multi-axis filters (category, location, certifications, price, etc.)
  • Sort (relevance, distance, price, popularity)
  • Auto-complete
  • Response < 200 ms even on bases of several thousand listings

Technically: PostgreSQL with its full-text extensions is enough up to ~100k listings. Beyond that, consider Algolia, Meilisearch or Elasticsearch.

Native SEO

A B2B marketplace largely lives off its SEO. Every listing, category, page must be:

  • Indexable (server rendering, not pure SPA)
  • With rich metadata (title, description, schema.org)
  • With clean and hierarchical URLs (/category/sub-category/listing-slug)
  • Fast (Core Web Vitals all green)

Next.js is well-suited to these requirements (SSG/ISR for stable pages, SSR for personalized pages).

Rich admin

On a marketplace, the admin is a critical quality position. The moderator must be able to:

  • Quickly validate registrations
  • Spot problematic listings (reports, quality, fraud)
  • Suspend an account in one click
  • Bulk-modify (e.g., change category of 50 listings)
  • Have an overview of traffic and conversions

Panorama Pub feedback

Panorama Pub was delivered in 2 months as a directory (not transactional marketplace). Choices that enabled this timeline:

  • Tight MVP perimeter: directory with search, supplier listings, solid admin. No (yet) payment, transactional matchmaking, review system.
  • Stable data model: modeled in 3 days during scoping, then not modified.
  • High-performance search from V1: PostgreSQL full-text with ranking.
  • Pre-fill on supply side: hundreds of supplier listings added before public launch.
  • Native SEO at the core: Next.js App Router with SSG + ISR, clean URLs, schema.org for listings.

Initial cost: ~€30k. Lead time: 2 months. Clear roadmap for the next building blocks (supplier area, matchmaking, content).

Going further

You have a directory or marketplace project? Run the diagnostic — I'll help scope it before any pricing.