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TableĀ 3 Summary statistics for the considered categories of listings. For each category, we included the number of unique listings, observations, and vendors. If the same vendor sold listings in different categories, we counted it as one unique vendor

From: Dark Web Marketplaces and COVID-19: before the vaccine

Category Unique listings Total observations Vendors
PPE 355 (45.1%) 5660 (59.8%) 88 (34.9%)
Medicines 228 (28.9%) 1917 (20.3%) 106 (42.1%)
Guides on scamming 99 (12.6%) 1244 (13.1%) 40 (15.9%)
Web Domains 50 (6.3%) 189 (2.0%) 15 (6.0%)
Medical Frauds 34 (4.3%) 316 (3.3%) 23 (9.1%)
Tests 17 (2.2%) 51 (0.5%) 13 (5.2%)
Fake Medical Records 3 (0.4%) 9 (0.1%) 3 (1.2%)
Ventilators 2 (0.3%) 78 (0.8%) 2 (0.8%)
COVID-19 788 (100%) 9464 (100%) 252 (100%)