Marketplace Seller Verification

Marketplace seller verification is the check an online platform runs on the individual sellers or sub-merchants transacting through it, distinct from a direct acquirer-merchant relationship in that the marketplace itself often sits between the seller and the payment rail, and can end up holding regulatory responsibility for who it lets sell. What the check actually needs to establish depends heavily on who the seller is: an individual reselling a used car or apartment listing on a classifieds site is a much lighter check (roughly KYC-shaped, confirm this is a real person with a real, matching ID) than a business sub-merchant taking payments through a marketplace's payment-splitting infrastructure (roughly KYB-shaped, confirm the business exists, its tax ID is valid, and someone authorized is behind the account).

The reason this sits as its own concept rather than folding entirely into KYB is that the platform, not the seller's bank or acquirer, is often the party a regulator holds accountable for who's allowed to transact. The EU's Digital Services Act made this explicit for online marketplaces generally: a platform that lets consumers enter contracts with third-party traders has to collect and verify identifying information about each trader before letting them sell. A "trace the trader" obligation that exists independent of whatever KYB check any payment processor downstream might separately run.

Who actually built this

Where the seller is a business processing payments, the underlying regulatory driver is the same FATF-derived beneficial-ownership lineage described under KYB and Merchant Onboarding. Where the platform itself carries the traceability obligation, the concrete legal hook is Article 30 of the EU's Digital Services Act (Regulation (EU) 2022/2065), a real, citable EU regulation, not informal best practice, though its exact application to a given marketplace depends on that marketplace's size, EU exposure, and business model and should be confirmed against legal counsel before being treated as a blanket rule. None of this is Solidus's design.

Solidus today

Solidus has not built a marketplace-seller-verification product. iyzico's "Pazaryeri" sub-merchant onboarding product, Craftgate's Marketplace Solution, and sahibinden.com's classifieds-seller model all appear in Solidus's own internal research as named targets, none contacted, none piloted. What's real, separately, is the general identity-verification pipeline (natural-person KYC, live on testnet) and the KYB specification (business verification, spec-stage, see KYB) that a marketplace-seller product would eventually be assembled from. No integration exists with any marketplace platform's onboarding API today.

See also

Merchant Onboarding is the closely related, sometimes overlapping check run directly by a payment facilitator or acquirer rather than a marketplace platform. KYB and KYC are the underlying business- and individual-verification checks this draws from, depending on the seller type. Credential Portability is what would let a seller verified on one marketplace reuse that check on another instead of re-onboarding from zero. Trust Registry is the mechanism a marketplace would use to decide whether to trust a reused seller credential's issuer.