Roundup
Best AI training data marketplaces
A marketplace, as opposed to a services shop, means standing supply: datasets already licensed and listed, not labor commissioned project by project. The model rewards buyers who need media without a collection timeline — and punishes the ones who skip rights diligence, because every storefront asserts licensing while differing sharply on whether proof exists at the file level or the seller level. This roundup ranks the marketplace-model vendors: the veteran catalog, the governed exchange, the media-scale aggregator, the self-serve storefront, and a consent-first niche player. fiund is itself a licensing marketplace and is not ranked; read this as one competitor’s honest map of the field.
- Defined.ai — The category veteran — a licensed-data marketplace since 2015, ISO 27001, 27701, and 42001 certified, with a January 2025 Getty Images engagement selling commercially-safe image datasets. fiund vs Defined.ai →
- Protege — The governance-forward exchange: owner-licensed supply from hundreds of data partners with revenue share flowing back to them, backed by $55M including a $30M extension led solely by a16z. fiund vs Protege →
- Troveo — The media-scale marketplace — source-licensed video, audio, robotics clips, and gaming data from 7,000+ providers, with more than $5M paid out to creators per Variety. fiund vs Troveo →
- Opendatabay — The self-serve storefront: open, synthetic, and premium datasets listed by verified sellers, with a rare public fee schedule — a tiered 5–30% seller commission. Rights depth varies listing by listing. fiund vs Opendatabay →
- The Vocal Market — The consent-first niche entry: a singing-vocal marketplace whose enterprise arm licenses stems under signed, timestamped vocalist agreements with explicit AI/ML opt-in and audit trails. fiund vs The Vocal Market →
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