Marketplace compliance responsibilities include Know Your Customer (KYC) and Know Your Business (KYB) verification confirming who your sellers are, Anti-Money Laundering (AML) and sanctions screening that protects your platform from illegal funds, and ongoing monitoring that catches problems after seller approval.

Financial institutions file millions of Suspicious Activity Reports (SARs) annually to US authorities, flagging potentially illicit transactions. Some payments platforms automate a large share of the verification and screening work, but platforms still own the risk decisions that automation can't make, such as how to handle a near-match or seller whose ownership structure raises questions.

Below, we'll cover AML, sanctions, and beneficial ownership requirements, how compliance changes depending on whether you're a marketplace or payment facilitator, and how to evaluate whether your current setup fits the size and complexity of your seller base.

Key takeaways

• Compliance responsibilities in a marketplace are shared among the platform, individual sellers, and payments infrastructure provider.

• Certain tools automate identity verification, sanctions screening, and ongoing transaction monitoring, but platforms still have to make some risk-based decisions.

• Marketplaces and payment facilitators carry different compliance obligations depending on how directly each one controls underwriting and the movement of funds.

What are marketplace compliance responsibilities?

Running a marketplace means taking on compliance work that splits across three parties: the platform, sellers, and payments infrastructure provider.

Before building, you need clear internal ownership for:

• Seller onboarding: Who reviews applications and sets acceptance criteria

• Identity verification: Who resolves failed or mismatched checks

• Transaction monitoring: Who watches for pattern changes after approval

• Payment execution: Who controls payout timing and holds

• Recordkeeping and escalation: Who documents decisions and acts on flags

Who handles KYC and KYB compliance in a marketplace?

KYC and KYB flows can be automated by payments providers, but platforms are responsible for making risk-based decisions that automation can't handle.

Before a marketplace can pay sellers, they must go through KYC and KYB verification. KYC applies to individual sellers, while KYB applies to registered businesses. A KYC flow for an individual seller usually collects a legal name, date of birth, address, and government-issued ID number, such as a Social Security number in the US or a national insurance number in the UK. A KYB flow for a business seller collects a legal entity name, registration number, business address, industry classification, and identification for anyone who owns 25% or more of the company.

A payments provider that automates KYB and KYC compliance can tell you if a submitted ID number doesn't match government records, or that a document upload failed optical character recognition (OCR) verification, but it can't advise whether to give that seller a second chance or shut the account down.

Platforms need to make their own decisions in scenarios such as:

• Name mismatches: A seller's legal name on their ID doesn't match the name on their bank account. This is common with recently married sellers or sellers using a "doing business as" (DBA) name.

• Document quality failures: Photos are blurry, IDs are expired, or there are documents in a script that automated tools can't parse.

• Address verification gaps: A seller is operating from a residential address that doesn't match their business registration.

• Repeated failed attempts: A seller has failed verification three or four times. This could mean confusion or an attempt to obscure identity.

What do AML, sanctions, and beneficial ownership compliance duties involve?

AML compliance requires ongoing assessment of whether money moving through a seller's account looks legitimate. This includes sanctions screening and beneficial ownership compliance.

Sanctions screening checks each seller against lists such as the US Office of Foreign Assets Control (OFAC)'s Specially Designated Nationals list, UK Sanctions List (UKSL), and EU's consolidated list. A match means the platform cannot pay that seller, regardless of transaction size. Politically Exposed Person (PEP) screening flags sellers who hold or are closely connected to high-profile public positions, such as elected officials, judges, or senior military officers, along with their immediate family members. A PEP match doesn't automatically disqualify someone, but it typically requires enhanced due diligence, such as closer review of their fund's source and more frequent monitoring.

Ultimate beneficial owner (UBO) collection is required under the US Corporate Transparency Act. Foreign-formed entities registered to do business in the US with non-US person owners must identify and verify individuals owning 25% or more of the business. (Most domestic US business sellers doing business in the US currently have no federal obligation to identify or verify 25% owners.) Under the EU's anti-money laundering requirements taking effect in July 2027, you must identify and verify any individual owning 25% or more of a business seller.

How do compliance responsibilities differ between marketplaces and payment facilitators?

A marketplace connects buyers and sellers and facilitates payment between them. A payment facilitator (payfac) handles the movement of funds. With this model, the marketplace offloads some of the compliance work and liability to the payfac. The marketplace leans on the provider's underwriting criteria and risk models and doesn't need to independently register with card networks as a payment facilitator.

A payfac takes on more direct responsibility for the payments themselves. It registers directly with card networks as a payment facilitator and manages submerchant onboarding under its own risk umbrella with its own underwriting logic. It generally carries more direct exposure when a submerchant seller commits fraud or fails to deliver goods.

Marketplaces can use a solution such as Stripe Connect to simplify compliance while meeting regulatory requirements. Connect allows businesses that need to orchestrate money movement across multiple parties to integrate Stripe and avoid the upfront costs and development time usually required for payment facilitation.

What happens when marketplace compliance monitoring falls short?

A platform with weak ongoing monitoring becomes an attractive target for fraudulent actors. A seller who passed KYC and KYB cleanly on day one can still become a compliance problem in the future.

Ongoing monitoring covers a few recurring checks:

• Transaction pattern analysis: Watches for sudden volume spikes or refund rate jumps that don't match a seller's stated business.

• Recurring sanctions rescreening: Runs checks constantly, since sanctions lists update without warning, and an approved seller may be sanctioned later.

• Periodic documentation refreshes: Requests updated information when a seller's registration expires or their details become outdated.

Automated solutions run ongoing risk assessment against transaction data and flag accounts that deviate from expected patterns, whether that's an unusual concentration of high-value transactions or activity that doesn't match a seller's registered business category.

How should platforms evaluate their marketplace compliance approach?

Start by mapping what your software solutions already automate against what still needs a decision from your team. Your team makes the judgement calls that follow identity verification, sanctions screening, and transaction monitoring: what to do with a near-match, how to handle a seller who fails verification repeatedly, what threshold triggers a manual review, and when an account gets suspended versus flagged for more information.

From there, assess your seller composition. A platform onboarding individual sellers in one country carries a lighter compliance load than one onboarding businesses across a dozen jurisdictions with different beneficial ownership thresholds and sanctions regimes. Finally, revisit your documented risk-based review criteria on a set schedule, rather than only after something goes wrong.

How Stripe Connect can help

Stripe Connect orchestrates money movement across multiple parties for software platforms and marketplaces. It offers quick onboarding, embedded components, global payouts and more.

Connect can help you:

• Launch in weeks: Use Stripe-hosted or embedded functionality to go live faster, and avoid the upfront costs and development time usually required for payment facilitation.

• Manage payments at scale: Use tooling and services from Stripe so you don't have to dedicate extra resources to margin reporting, tax forms, risk, global payment methods or onboarding compliance.

• Grow globally: Help your users reach more customers worldwide with local payment methods and the ability to easily calculate sales tax, VAT and GST.

• Build new lines of revenue: Optimise payment revenue by collecting fees on each transaction. Monetise Stripe's capabilities by enabling in-person payments, instant payouts, sales tax collection, financing, expense cards and more on your platform.

Learn more about Stripe Connect or get started today.

FAQs about marketplace compliance