Niche Two-Sided Marketplaces

The two-sided marketplace is one of the most defensible business models in software. When you own the platform where buyers and sellers transact, you earn on every exchange without owning inventory. The successful ones — Etsy, Fiverr, Upwork, Airbnb — generate billions in revenue from network effects that become stronger with every new participant.

The difficult part isn't the idea. It's the first 18 months of infrastructure that has to work before the network effects kick in. The payment flows are complicated (you're not just charging one party — you're routing money between multiple parties while taking a cut). The trust layer is complicated (how do you prevent fraud, handle disputes, and verify sellers before they interact with buyers?). The discovery layer is complicated (search has to work well or buyers leave immediately).

Every hour you spend building payment infrastructure from scratch is an hour not spent on supply acquisition, demand generation, and the category-specific features that make your marketplace useful. The Niche Two-Sided Marketplace Platform handles the infrastructure so you can focus on the category.

Stripe Connect: The Right Way to Route Marketplace Payments

Stripe Connect is what every serious marketplace runs on — Lyft, DoorDash, Kickstarter, and thousands of others. It handles the regulatory and financial complexity of routing money between multiple parties while keeping a platform fee.

There are three Stripe Connect account types for different marketplace models. This codebase is built on Stripe Connect Custom, which gives you the most control over the user experience while Stripe handles the compliance, bank relationships, and money movement.

What's implemented:

Seller onboarding: When a new seller joins your platform, they're guided through a Stripe Connect onboarding flow that collects their banking information, tax ID, and identity verification. Stripe handles KYC (Know Your Customer) requirements and AML (Anti-Money Laundering) checks. You never touch sensitive financial information.

Payment hold and release: When a buyer pays, the funds are held in Stripe's system rather than immediately transferred to the seller. You control when they're released — immediately on purchase, after buyer confirmation, or after a dispute window expires. This is what enables escrow semantics without running a licensed money transmitter.

Platform fees: Your percentage or flat fee is deducted at transfer time. You can set different rates by seller tier, category, or negotiated agreement. Fee calculation is transparent and logged for dispute resolution.

Split payments: For transactions involving multiple sellers (e.g., a buyer purchasing from multiple sellers in a single checkout), the payment is split and routed to each seller automatically with your platform fee calculated on the total.

Refunds: When a refund is issued, the reversal logic correctly claws back the seller's portion and returns the full amount to the buyer, with the platform fee also reversed.

Algolia: Search That Actually Finds What Buyers Are Looking For

Free-text search is where most early-stage marketplaces fail. If buyers type "handmade silver earrings" and get zero results because someone listed "hand-crafted sterling silver ear jewelry," they leave. If search is slow, they leave. If filtering by price, location, or rating is clunky, they leave.

Algolia indexes your entire product and service catalog and returns results in under 10ms with typo tolerance, synonym handling, and intelligent ranking that surfaces the most relevant listings.

The search experience in this codebase includes:

• Faceted filtering — buyers refine by price range, rating, seller location, category attributes, and custom fields relevant to your niche
• Geo search — for local or regional marketplaces, results are filtered and ranked by distance from the buyer's location
• Instant search — results update on every keystroke without waiting for a full page reload
• Personalized ranking — buyers who have purchased in specific categories see relevant listings ranked higher
• Merchandising controls — you can pin specific listings (premium placement, promoted sellers) or exclude listings from search without changing how the search algorithm works

Trust Infrastructure: Reviews, Verification, and Disputes

The trust layer is what separates a marketplace from a classified ads site. Buyers need to know they can trust sellers before transacting. Sellers need to know they'll be paid fairly.

Review system: Both parties review each transaction. Reviews are verified (only actual transaction parties can leave reviews), displayed with response capability, and factored into seller ranking in search. Fake or coerced reviews trigger automatic flagging.

Seller verification tiers: New sellers start at the base verification level (email + phone). Higher tiers unlock features (higher transaction limits, a "Verified" badge, earlier payout timing) in exchange for providing additional identity documentation via Stripe's identity verification flow.

Dispute resolution: When a buyer and seller disagree about whether a service was delivered, the dispute flow gives both parties a structured opportunity to submit evidence. Your admin team reviews through a purpose-built interface and makes a ruling. The system enforces the ruling by releasing or reversing the escrow hold accordingly.

Internal messaging: Buyers and sellers communicate through a platform-hosted messaging system before and during transactions. Messages are logged, searchable by admins for dispute evidence, and subject to content moderation policies you define. Off-platform communication (sharing contact info to circumvent your platform) is flagged automatically.