KYC software for marketplaces
Online marketplaces and platforms onboard sellers, hosts and service providers faster than any team can review them, and then pay them out. Most marketplaces are not named in anti-money laundering law, but sanctions, consumer protection and tax rules all expect them to know who their sellers are. This guide explains why seller verification matters, what a marketplace program needs, and how to choose software for it.
Why marketplaces carry specific risk
- Onboarding faster than review: a funnel that converts well produces sellers faster than a person can look at them.
- Payouts are the exposure: sending money to a seller who is designated, or owned by someone who is, can breach sanctions law.
- Business sellers behind personal accounts: traders registering as individuals hide the company and the owners behind them.
- Cross-border sellers: sellers arrive from many countries while the platform's obligations follow where it is established and where it pays out.
- Fraudulent and repeat sellers: banned sellers come back under new accounts, emails and devices.
- Reputation: when a seller becomes a story, the question is what the platform knew at onboarding and what it did about it.
What the seller program needs
- 1
Filter sign-ups
Email, phone, IP, velocity and bot checks stop fake and repeat seller accounts before verification is paid for.
- 2
Identify the seller
Collecting and checking who the seller is: identity details for individuals, and company details, directors and beneficial owners for business sellers.
- 3
Screen before the first payout
Sanctions, PEP and adverse media screening of sellers and their owners, so no money reaches a designated person.
- 4
Re-screen the seller base
Checking existing sellers again when lists change, as a batch, rather than only at sign-up.
- 5
Keep the evidence
A record of who was checked, when and with what result, for regulators, payment partners and the platform's own trust and safety team.
Regulatory expectations
Anti-money laundering law usually does not name marketplaces as such. Sanctions law applies to everyone, though: a platform must not make funds available to a designated person, directly or through a company they own or control, and a seller payout is exactly that kind of payment.
If a marketplace collects buyers' money and passes it on to sellers itself, that activity can be a regulated payment service, which may require payment authorisation and bring anti-money laundering duties with it; many platforms use a licensed payment provider instead, which will in turn expect the platform's help with seller due diligence. In the EU, the Digital Services Act requires online marketplaces to collect and make reasonable efforts to verify information on the traders who use them, and the DAC7 rules require digital platforms to collect information on sellers and report it to tax authorities.
How to choose KYC software for a marketplace
- Volume: a real-time API for sign-up and a batch route for re-screening a large seller base.
- Business sellers: company lookup and ownership screening, not only checks on the individual who registered.
- Payout timing: screening that can run before the first payout as well as at onboarding.
- Fraud signals: email, phone, IP and velocity checks that catch repeat and fake sellers early.
- Explainable matches: every hit carries the source record behind it, so a trust and safety analyst can decide quickly.
- Data handling: control over where seller data is processed and how long screening records are kept.
on8.ai
Seller screening with on8.ai
on8.ai provides the screening layer for marketplaces: sanctions, PEP and adverse media screening of sellers and their owners, company ownership checks, bulk re-screening, and fraud checks at sign-up. Each customer gets a dedicated deployment, and no large language model or external API sits in the decision path.
Sanctions screening
Screen sellers at sign-up and before the first payout, by API.
Learn moreKYB and ownership
Screen business sellers and their owners, with the OFAC 50 Percent Rule applied.
Learn moreBulk screening
Re-screen an existing seller base in batch, with the same matching and evidence as single checks.
Learn morePre-KYC checks
Email, phone and IP risk, velocity and bot detection to stop fake and repeat seller accounts.
Learn morePassporter
In developmentDocument and identity verification for seller onboarding.
Learn moreFAQ
Frequently asked questions
Do marketplaces need to verify their sellers?
In many cases, yes, for different reasons: sanctions law applies to every payout, consumer protection rules such as the EU Digital Services Act expect marketplaces to identify traders, tax reporting rules require seller information, and payment partners expect seller due diligence.
Is a marketplace an obliged entity under AML law?
Usually not as a marketplace. It can become one, or need payment authorisation, if it handles buyers' and sellers' money itself. Many platforms use a licensed payment provider for that, which then expects support with seller due diligence.
When should sellers be screened?
At sign-up, before the first payout, and again whenever the sanctions lists change. A seller who was clear when they joined can be designated later.
Can I try on8.ai screening for free?
Yes. The free sanctions search on on8.ai screens a person or company against sanctions and PEP sources and emails you the full report as a PDF.
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