LabelSets is a marketplace for labeled ML training data. Every dataset gets an automated LQS quality score (0–100) across 5 dimensions: completeness, uniqueness, label quality, format validity, and size. Buyers get instant download with a commercial license — no vendor calls, no NDAs. Sellers keep 85% of every sale, the highest payout in the market. Free dataset quality audit tool at labelsets.ai/quality-audit — no account needed. 30+ datasets live across CV, NLP, medical, financial, and audio.