Best AI training data marketplaces in 2027
By Gareth HoyleLast updated How we research
In short
The best AI training data marketplaces in 2027 are Defined.ai, Opendatabay, Datarade, AWS Data Exchange, DataVendor and FileYield, with Sell My Data To AI ranked first for teams that need vetted sellers sourced to order. Catalogs range from 655 data products on Opendatabay to more than 3,500 datasets on AWS Data Exchange. Vetting and seller fees differ widely between platforms.
Key takeaways
- Defined.ai is best for speech, language and multimodal data with vetted partners.
- Opendatabay is best for self-serve licensing of packaged AI datasets.
- Datarade is best for comparing data products across many providers.
- Sell My Data To AI wrote this list and ranks itself first. The method section explains the criteria.
- Every entry's facts come from the company's own published terms, checked November 2026.
An AI training data marketplace lets providers list datasets and lets AI teams search, compare and license them. Our data marketplace definition and our guide to AI data marketplaces, brokers and direct deals explain how they differ from brokers.
Catalog size and vetting vary. Defined.ai says only 30% of partners pass its ethical vetting, Datarade reviews provider applications in 1 to 2 business days, and DataVendor sign-up is self-serve with no application review. AWS Data Exchange lists more than 3,500 datasets from more than 300 providers.
A listing is not proof of rights. Run every dataset through our AI training data due diligence checklist and evaluate a sample before you train on it. If the data you need is not listed, you can submit a data requirement.
- 1
Sell My Data To AI
Best for AI teams that need vetted sellers found to order
Sell My Data To AI is an independent broker that finds, vets and shortlists sellers of rights-cleared training data for AI labs and enterprise AI teams. Every seller passes an eight-point vetting standard before you see their data, samples arrive redacted under a mutual NDA, and you sign the license directly with the seller. Submitting a requirement and reviewing a shortlist cost nothing.
- Fee to buyer
- Nothing to submit a requirement or review a shortlist. Any fee agreed in writing before an introduction
- Seller vetting
- Authority to sign, ownership, contract restrictions, privacy notices, third-party content, de-identification, sample quality and manifest accuracy
- Samples
- Redacted samples under a mutual NDA before any license is signed
- License
- Signed directly between you and the seller. Full data moves only after signing
- Independence
- Independent of the buyers we work with. We do not own an AI model or buy data for our own use
- 2
Defined.ai
Best for speech, language and multimodal data with vetted partners
Defined.ai runs an AI data marketplace where enterprises buy ready-made or commissioned speech, text, image, video and multimodal training data. It cites more than 1.6 million contributors across more than 150 countries and more than 500 languages and locales, lists ISO 27001, 27701 and 42001 accreditation, and says only 30% of partners pass its ethical vetting. Seller revenue share and payment timing are not published.
- What it buys
- Lists speech, text, image, video, music and sound effects, and multimodal datasets from partners
- Size requirement
- Not published. Partners pass an ethical vetting process, and Defined.ai says 30% are approved
- Fee to seller
- Not published
- Payment timing
- Not published
- 3
Opendatabay
Best for self-serve licensing of packaged AI datasets
Opendatabay is a marketplace for licensed AI training and fine-tuning datasets, showing 111 licensed data providers and 655 data products on its homepage across text, image, audio, video, code, agentic trajectories and synthetic data. Listing is free, sellers set the price and keep 70% to 95% depending on the sale price, and self-serve payouts arrive within 30 days of the end of the month.
- What it buys
- Lists text, image, audio, video, code, agentic trajectories, 3D, tabular, time-series, human feedback and synthetic data
- Size requirement
- Not published
- Fee to seller
- Free to list. Commission from 30% (sales up to $100) to 5% (sales above $250,000), set per transaction
- Payment timing
- Within 30 days of the end of the month for self-serve sales. Balances under $50 carry forward
- 4
Datarade
Best for comparing data products across many providers
Datarade is a data marketplace and directory where buyers find and compare data products from more than 2,000 providers across more than 560 categories, including AI training datasets. Buyers use it free. Providers choose a commission-only plan at 30% or annual plans of $6,000 or $12,000 with 20% or 15% commission, and applications are reviewed in 1 to 2 business days.
- What it buys
- Lists data products across more than 560 categories, including AI training datasets
- Size requirement
- None published. Applications reviewed in 1 to 2 business days
- Fee to seller
- Commission-only: $0 a year plus 30%. Bronze: $6,000 a year plus 20%. Silver: $12,000 a year plus 15%. Gold: custom
- Payment timing
- Not published
- 5
AWS Data Exchange
Best for teams that want subscription data delivered into AWS
AWS Data Exchange is Amazon Web Services' catalog of third-party data files, tables and APIs sold by subscription, listing more than 3,500 datasets from more than 300 providers. Providers must register as AWS Marketplace sellers in an eligible jurisdiction, including the UK, EU and US, and are paid monthly after AWS collects from subscribers, minus AWS Marketplace service fees.
- What it buys
- Lists third-party data files, data tables and data APIs sold by subscription
- Size requirement
- Must register as an AWS Marketplace seller. Paid products need residency or incorporation in an eligible jurisdiction, including the UK, EU and US
- Fee to seller
- AWS Marketplace service fees deducted. Rate not stated on the pages we checked
- Payment timing
- Monthly on a rolling schedule, only after funds are collected from the subscriber
- 6
DataVendor
Best for codebases, tasksets and RL environments
DataVendor is a marketplace on the HUD platform where vendors sell codebases, tasksets with their RL environments, corpora and raw data to AI companies. Sign-up is self-serve with no application review, vendors set their own prices and can import private repositories from GitHub, GitLab or Bitbucket, and DataVendor keeps 20% of earnings on withdrawal. Buyer access is invite-only and all sales are final.
- What it buys
- Lists codebases, tasksets with their RL environments, corpora and raw data
- Size requirement
- None. Self-serve sign-up with no application review
- Fee to seller
- 20% of vendor earnings, charged on withdrawal. A $15 dispute fee passes to the vendor if a dispute is lost
- Payment timing
- Not published
- 7
FileYield
Best for negotiating license terms directly with a seller
FileYield, operated by Dployers LLC, is a brokered marketplace where sellers list AI training datasets free and negotiate price, license type and exclusivity directly with buyers. Its taxonomy covers 2,566 data types across 36 categories. FileYield does not touch the data, process payments or hold escrow, and its terms say any facilitation fees are disclosed when you list, request or accept a deal.
- What it buys
- Lists datasets across 36 categories and 2,566 data types, from structured records to audio, medical imaging, code and video
- Size requirement
- Not published. Listings are reviewed before going live
- Fee to seller
- Free to list. Any facilitation fees are disclosed when you list, request or accept a deal
- Payment timing
- Arranged directly between seller and buyer
- 8
Human Native
Best for content licensed from creators and rights holders
Human Native is an AI data marketplace, founded in 2024, built to help creators and rights holders license content to AI developers with control, compensation and credit. Techzine reported in January 2026 that Cloudflare had acquired it, and its own site now says Human Native is joining Cloudflare. It publishes no fees, revenue share, exclusivity or payment terms, so ask for current terms.
- What it buys
- Content from creators and rights holders, prepared as AI-ready datasets
- Size requirement
- Not published
- Fee to seller
- Not published
- Payment timing
- Not published
How we ranked this list
Sell My Data To AI wrote this list and ranks itself first. We are a broker with a commercial interest in the result, and some companies below offer a service similar to ours. Read the order with that in mind.
For this list we gave extra weight to platforms that publish their vetting process and fee model, and to the range of data types an AI team can license from them.
| Criterion | What we checked |
|---|---|
| Fit for the data type | Whether the platform lists or supplies this kind of data in its own catalog or brief |
| Published terms | Whether payouts, size requirements and license terms appear on the company's own pages |
| Vetting | What checks the company says it runs on sellers, buyers or datasets before a sample changes hands |
| Exclusivity | Whether licenses are exclusive, non-exclusive or perpetual, and whether that is published |
| Fees | What buyers and sellers pay, and whether the rate is published |
| Payment timing | When sellers are paid, as stated by the company |
| Transparency | How much of the above you can confirm before a first call |
Every fact about another company comes from our profile of it in the data buyers directory, checked on that company's own pages in November 2026. Where a term is missing we write "Not published" rather than guess. After first place, the order reflects fit for an AI team sourcing training data, not a quality score, and we do not rate any company negatively.
We rank Sell My Data To AI first because this is our list and our service is built for this reader, not because we scored ourselves against the others. We are independent of the buyers we work with, and our terms are on our fees and how we vet pages so you can compare them line by line.
Frequently asked questions
What is an AI training data marketplace?
How do AI data marketplaces vet the datasets they list?
What do AI data marketplaces charge?
Is a marketplace or a broker better for sourcing training data?
Sources
- Defined.ai homepage, Defined.ai, accessed November 2026
- AI marketplace partnerships, Defined.ai, accessed November 2026
- Opendatabay homepage, Opendatabay, accessed November 2026
- Fees and pricing, Opendatabay, accessed November 2026
- Datarade homepage, Datarade, accessed November 2026
- Apply as a data provider, Datarade, accessed November 2026
- AWS Data Exchange, Amazon Web Services, accessed November 2026
- Provider financials, Amazon Web Services, accessed November 2026
- Seller eligibility requirements, Amazon Web Services, accessed November 2026
- DataVendor homepage, DataVendor, accessed November 2026
- DataVendor documentation, DataVendor, accessed November 2026
- FAQ, DataVendor, accessed November 2026
- Become a vendor, DataVendor, accessed November 2026
- FileYield homepage, FileYield, accessed November 2026
- How it works, FileYield, accessed November 2026
- Terms of service, FileYield, accessed November 2026
- Human Native is joining Cloudflare, Human Native, accessed November 2026
- Cloudflare acquires Human Native for AI data marketplace, Techzine, accessed November 2026