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As the name implies, darkBay a.k.a. dBay can be regarded as the eBay of the darknet. This also becomes clear as soon as you visit the site: dBay is one of the few market sites that basically offer everything.
Sipulimarket (meaning "onion market") is a large Finnish darknet website.
UniCC is one of the largest card shop sites on the darknet. It operates since 2014 and offers credit cards of all brands (Amex, Visa, Mastercard, Diner's Club). It is also one of the most popular markets because it updates very frequently with new offers. Due to its popularity, there is a myriad of fake sites around, so make sure to only use our or otherwise legitimate links
Escobay is a darknet market
Hydra is a very big russian market
Wannabuy is one of the biggest sources of hacked RDPs on the dark web.
Apollon is one of the largest - if not the largest - generic darknet market around. If you are specifically looking for drugs and medications, there may be better options. But Apollon is for you if you want to browse the marketplace with the largest portfolio: Apart from drugs you can find credit card datasets, accounts of all kinds, PII (including scans of official documents), malware, hosting - you name it, you'll find it on Apollon. Apollon is also one of the few markets where the UI is available in several languages: English, German, Italian, French, and Polish. You can easily switch the language from the menu. The accepted currencies on Apollon are Bitcoin, Monero, Litecoin and Bitcoin Cash as well as US Dollar.