C2C (consumer-to-consumer)

C2C, short for consumer-to-consumer, is a commerce model in which private individuals sell goods or services directly to other private individuals. Instead of a company acting as the seller, an online platform — a marketplace, classifieds site or auction service — sits in the middle, matching buyers with sellers and monetising the traffic through commissions and fees.

How the C2C model works

The platform's core job is to reduce the risk of trading with strangers. It provides listings and search, messaging, integrated payments, and above all trust mechanisms: seller ratings and reviews, buyer protection programmes, and escrow-style payouts released only after the buyer confirms delivery. Because both parties are consumers, the statutory protections typical of B2C sales (such as mandatory return windows) apply only partially — the platform's own rules fill that gap.

Classic examples include eBay, Vinted, Facebook Marketplace and local classifieds portals, along with sharing-economy services where individuals rent out rooms, tools or skills to one another.

Practical use cases

C2C powers the fast-growing re-commerce market: second-hand fashion, used electronics, books and collectibles. For sellers it is a zero-inventory-cost way to monetise unused items; for buyers it means lower prices and access to discontinued or unique goods. Sellers who scale up often graduate into professional accounts, blurring the line between C2C and B2C — many jurisdictions and platforms now require verification and transaction reporting once a private seller trades regularly for profit.

From an engineering standpoint, a C2C marketplace is a demanding product: millions of small transactions, user-generated content that needs moderation, fraud detection, and sharp traffic peaks around sales seasons. That typically calls for horizontally scalable application servers, a robust relational database, queues for asynchronous processing and a CDN for listing images — the kind of stack usually deployed on cloud or VPS infrastructure that can grow with demand.