Vendor review · licensed marketplace
Opendatabay
A young UK marketplace for buying and selling AI-ready datasets — breadth and self-serve convenience, with a licensing-first pitch still being proven.
Facts checked against primary sources on July 21, 2026.
- Self-serve breadth - open, synthetic, and premium datasets across many modalities in one storefront, with instant access
- Published fee schedule - a rare bit of pricing transparency; the tiered 5–30% seller commission is public
- Licensing-first framing - seller verification and rights-cleared positioning, uncommon for a general data marketplace
- Young company - incorporated in the UK in May 2024; large-buyer track record and catalog depth are still building
- Provider-set licences - rights and consent depth vary listing by listing, with no file-level provenance standard
- Open/synthetic weighting - headline dataset counts include free open data, so scarce premium supply is thinner than it looks
What Opendatabay is
Opendatabay Ltd, registered in England and Wales (company no. 15711573, incorporated May 2024), runs a self-serve data marketplace where providers list datasets — open, synthetic, and premium — for AI and LLM training, alongside an open-data repository and a dataset-request service.
Modalities and languages they cover
Listing-dependent rather than curated: the company markets text, image, audio, video, code, and agentic-trajectory data, plus 3D, tabular, time-series, and synthetic collections. There is no fixed language or modality catalog — coverage is whatever sellers have listed.
Sourcing model
Third-party aggregation. Data comes from outside providers who, per the company, pass seller verification and due diligence before listing; Opendatabay itself does not commission or capture data.
Rights & provenance posture
Opendatabay says it focuses exclusively on licensed, consented, rights-cleared datasets and verifies that sellers have the legal authority to sell. Verification is described at the seller level, though — licence terms are set per listing, and public materials do not show file-level consent or provenance documentation, so audio/video buyers should request the underlying records asset by asset.
Pricing
Self-serve: open datasets are free and premium datasets are priced by their sellers. Unusually, the seller fee schedule is public — a tiered commission from 30% on sales under £100 down to 5% above £50,000, per a fees page updated February 2026. Sellers are paid in GBP, £100 minimum, on 30-day terms.
Where Opendatabay falls behind
Trust is asserted at the storefront level, not carried by the file. A meaningful share of the catalog is open-repository or synthetic data available elsewhere, premium listings carry provider-written licences of varying depth, and there is no standardized consent record travelling with the media — the gap a provenance-first licensor is built to close.
Sources
- Opendatabay — About
- Opendatabay — Platform Fees & Commission Schedule
- Companies House — Opendatabay Ltd (no. 15711573)
- Opendatabay — Marketplace
Alternatives
Weighing fiund as one of the alternatives? Read how fiund compares to Opendatabay — a first-party comparison that is explicit about where Opendatabay wins.
Frequently asked questions
Is Opendatabay data rights-cleared for AI training?
The company says it lists only licensed, consented datasets and verifies sellers’ authority to sell. Licence terms are still set per listing, so confirm AI-training and redistribution rights on each dataset before buying.
How much does Opendatabay cost?
Open datasets are free; premium datasets are priced individually by sellers. On the sell side, Opendatabay takes a published tiered commission of 5–30% depending on sale price.
Who is Opendatabay best for?
Teams that want quick, self-serve access to off-the-shelf or synthetic datasets, and data owners wanting a low-friction storefront. Bespoke, consent-documented media capture is not the model.
Want data you can actually defend in diligence?
fiund licenses real-world audio and video at the source, with the rights cleared before anything moves.
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