A two-sided marketplace is not a standard business website and should not be governed by standard website terms of service. When your platform connects buyers and sellers, hosts and guests, service providers and clients, or creators and consumers, you are operating in the middle of multiple independent legal relationships simultaneously.
Each side of the market has different rights, different obligations, and different legal exposure. Your terms of service need to address all of them with precision, or you will find yourself liable for disputes between parties whose relationship you facilitated but did not intend to control.
This guide covers the legal requirements that two-sided marketplace terms of service must address, what distinguishes a marketplace ToS from a standard content platform or SaaS agreement, and where platforms most frequently get their legal structure wrong.
1. Why Marketplace Terms of Service Are Legally Distinct
A single-sided platform has one type of user. A two-sided marketplace has at minimum two user types with different and sometimes conflicting interests. Sellers want to list products or services and get paid. Buyers want accurate listings, reliable delivery, and recourse when things go wrong. Your platform sits in the middle, processing payments, managing reviews, setting listing policies, and often holding funds in escrow during transactions.
That middle position creates legal exposure that a single-sided platform does not face. Your platform may be treated as a party to the underlying transactions between buyers and sellers depending on how much control you exercise over pricing, listing quality, fulfillment standards, and dispute resolution. The more control you exercise, the more difficult it becomes to argue that you are merely a neutral facilitator.
Your terms of service must carefully define your platform’s role in the underlying transaction and the limits of your liability arising from that transaction. Getting this wrong does not just create contractual exposure. It can affect your ability to rely on Section 230 immunity, your classification under consumer protection statutes, and your obligations under payment processing regulations.
2. Separate Obligations for Each Side of the Market
A marketplace terms of service document needs to address sellers and buyers separately. Using a single, undifferentiated terms document that applies equally to both sides creates legal ambiguity that regulators, courts, and your own dispute resolution process will struggle to resolve.
Seller obligations typically include accurate and complete listing descriptions, truthful pricing with no hidden fees, compliance with applicable product safety and regulatory requirements, timely fulfillment or service delivery, responsibility for applicable taxes, compliance with your prohibited content policies, and acceptance of your dispute resolution process and chargeback obligations.
Buyer obligations typically include accurate account information, legitimate payment methods, compliance with the seller’s listing terms regarding cancellations and returns, and acceptable use of your review and rating system. Neither of these obligation sets maps cleanly onto a standard “user” role. Your terms need to define both roles and apply different provisions to each.
3. The Liability Gap Between Facilitator and Merchant
The central legal question for any marketplace operator is where the seller’s liability ends and the platform’s liability begins. Many marketplace operators believe their terms of service can disclaim all liability for seller conduct with a single sentence. Courts have been inconsistent in enforcing this disclaimer, particularly when the platform exercises significant control over the seller experience.
The FTC’s guidance on marketplace liability focuses on whether the platform’s representations about sellers or products could mislead a reasonable consumer. If your platform prominently displays a “Verified Seller” badge, a “Money-Back Guarantee” promise, or curated editorial recommendations, you may be creating consumer expectations that override your disclaimer.
The EU’s Digital Services Act (DSA), which applies to platforms serving EU users and entered full application in 2024, imposes specific obligations on marketplace operators around seller verification, notice-and-action procedures, and consumer redress that go significantly beyond what US law currently requires. Your terms of service should define your role with precision rather than relying on a vague disclaimer.
4. Payment Processing, Escrow, and Chargeback Liability
Two-sided marketplaces that process payments between buyers and sellers face specific legal requirements around how funds are held and disbursed. If your platform holds payment from the buyer before releasing it to the seller, you may be operating as a payment intermediary under state money transmission laws.
Your terms must clearly address escrow and release conditions (when is payment released to the seller?), chargeback responsibility (if a buyer successfully disputes a charge after funds were released to the seller, who absorbs the loss?), platform fee treatment on refunded transactions, and seller payout timing. For broader guidance on how B2B platform agreements should be structured, the analysis of vendor agreement requirements provides relevant context on payment and remediation provisions.
5. Dispute Resolution Between Buyers and Sellers
A two-sided marketplace inevitably produces disputes between buyers and sellers. Your dispute resolution provisions should address who decides (does your platform make final decisions, or do disputes go to third-party arbitration?), what evidence is considered, timelines for submission and review, refund and return standards, and platform liability limits on any buyer protection programs you offer.
Vague dispute resolution terms that promise “we will review and resolve disputes fairly” are not sufficient. When your dispute resolution process fails to produce a result one party accepts, they will file a chargeback, a complaint with a state consumer protection agency, or a lawsuit. Clear written procedures are both a legal protection and a customer trust tool.
6. Content Moderation, Listing Policies, and Section 230
Your marketplace terms of service must establish listing policies that define what sellers can and cannot offer on your platform, and must give you the right to remove listings, suspend accounts, and ban sellers who violate those policies.
Section 230 of the Communications Decency Act provides platforms with immunity from liability for content created by third-party users, including sellers. However, this immunity has limits. Your ability to rely on Section 230 depends in part on your platform’s role in creating or editing seller content. Your terms should define prohibited categories, reserve your right to remove any listing, disclaim liability for unverified seller content, and define your notice-and-takedown process for intellectual property complaints. An analysis of how platform liability under Section 230 applies to marketplace operators is worth reviewing before finalizing your terms.
7. Tax Collection, Marketplace Facilitator Laws, and Disclosure
Marketplace facilitator laws in the United States require many platforms to collect and remit sales tax on behalf of sellers. As of 2026, the majority of US states have enacted marketplace facilitator statutes following the Supreme Court’s 2018 decision in South Dakota v. Wayfair, Inc. Whether your platform qualifies as a marketplace facilitator depends on your transaction volume, the nature of goods or services sold, and the specific rules of each state.
Your terms of service must accurately disclose how tax is handled in transactions on your platform. Sellers need to know whether you are collecting and remitting on their behalf or whether they retain that obligation. Incorrect tax handling in your terms exposes your platform to liability if sellers fail to comply with their own tax obligations based on incorrect representations in your agreement.
8. What a Technology Lawyer Structures for Marketplace Operators
Marketplace operators who try to adapt a standard content platform or SaaS terms document to their two-sided business create a document that addresses neither side adequately. The legal issues that arise in marketplace disputes typically involve provisions that standard templates do not include: payment escrow mechanics, chargeback responsibility allocation, seller verification standards, and the precise definition of the platform’s facilitator role.
The terms and conditions and technology lawyer experience that Hansen Tong brings to marketplace agreements reflects an understanding of how these platforms actually operate, not just how standard legal documents are organized.
Frequently Asked Questions
Can I use the same terms of service for both buyers and sellers on my marketplace?
You can use a single document that includes distinct sections for each user type, but you cannot apply identical terms to both sides. Buyers and sellers have fundamentally different rights and obligations on a marketplace platform, and your terms must address each side separately. A single undifferentiated terms document creates legal ambiguity that will work against you in disputes.
Does Section 230 protect my marketplace from liability for seller conduct?
Section 230 provides immunity from liability for content created by third-party users, but this immunity does not extend to all aspects of marketplace operation. If your platform exercises significant control over seller listings, makes representations about seller quality or product authenticity, or takes an active role in transactions beyond facilitation, your Section 230 protection may be limited.
Do I need a money transmitter license to operate a marketplace that processes payments?
Potentially yes. If your platform holds buyer payments before releasing them to sellers, you may be operating as a payment intermediary subject to state money transmission licensing requirements. The answer depends on your payment flow, the states where you operate, and whether you use a licensed third-party payment processor. This requires legal analysis specific to your architecture.
How should my terms handle a situation where a seller defrauds a buyer?
Your terms should define what buyer protection your platform provides, the conditions under which that protection applies, and the maximum amount of coverage. Your dispute resolution process should describe how fraud claims are investigated, and your seller terms should hold sellers responsible for fraudulent conduct and reserve your right to terminate seller access.
Am I required to collect sales tax on behalf of sellers on my marketplace?
Under marketplace facilitator laws enacted in most US states following South Dakota v. Wayfair, Inc., many marketplace operators are required to collect and remit sales tax on transactions facilitated through their platform. Whether you qualify and what your obligations are depends on your transaction volume and the rules of each state where sales occur.
What should my marketplace terms say about reviews and ratings?
Your terms should prohibit fraudulent reviews, review manipulation, and review extortion. You should reserve the right to remove reviews that violate these policies and define whether reviews are considered user-generated content covered by your content policies and what recourse a seller has if they believe a review is fraudulent.
Get Your Marketplace Terms Right
Two-sided marketplace terms of service require a legal structure that standard website terms and SaaS agreements do not provide. If your platform connects buyers and sellers and your terms do not specifically address payment mechanics, dispute resolution, seller obligations, buyer protection, and your platform’s precise role in the underlying transaction, your agreement does not protect your business.
Hansen Tong at TOS Lawyer works with marketplace operators, platform businesses, and technology companies to draft terms of service that address the specific legal realities of two-sided marketplace models. Contact TOS Lawyer to get your marketplace terms reviewed by a technology law specialist.