Table 1.
Data set summary of marketplaces and forums that were collected for this study.
| Name | Type | Lifetime | Measurement dates | Number of traces/listings | Number of opioid traces/listings |
| Agora | Marketplace | December 2013 to August 2015 | January 2014 to July 2015 | 140,266 | 12,051 |
| Alphabay | Marketplace | December 2014 to July 2017 | December 2014 to July 2015 | 21,679 | 1344 |
| Hydra | Marketplace | March 2014 to November 2014 | August 2014 to October 2014 | 3048 | 218 |
| Pandora | Marketplace | October 2013 to November 2014 | December 2013 to November 2014 | 20,013 | 1749 |
| Evolution | Marketplace | January 2014 to March 2015 | April 2014 to March 2015 | 54,196 | 4954 |
| Apollon | Marketplace | May 2018 to March 2020 | September 2018 to February 2020 | 2921 | 2552 |
| Empire | Marketplace | February 2018 to August 2020 | April 2018 to March 2020 | 2995 | 2548 |
| The Versus Project | Marketplace | November 2019 to now | November 2019 to March 2020 | 233 | 202 |
| Avaris | Marketplace | October 2019 to August 2020 | October 2019 to February 2020 | 291 | 286 |
| Darkbay | Marketplace | July 2019 to September 2020 | July 2019 to February 2020 | 2717 | 2112 |
| Black Market | Forum | December 2013 to February 2014 | December 2013 to February 2014 | 52,127 | 669 |
| Pandora | Forum | October 2013 to September 2014 | January 2014 to September 2014 | 18,640 | 798 |
| Hydra | Forum | March 2014 to November 2014 | April 2014 to September 2014 | 887 | 41 |
| The Hub | Forum | January 2014 to now | January 2014 to July 2015 | 53,973 | 1082 |
| Evolution | Forum | January 2014 to March 2015 | January 2014 to November 2014 | 166,641 | 2682 |
| Silk Road | Forum | January 2011 to November 2014 | June 2011 to November 2013 | 846,693 | 34,519 |