Why I cannot write this guide
CVV dumps are stolen card data. Buying, selling, or brokering them is payment card fraud and identity theft under U.S. law, including 18 U.S.C. § 1029, which covers trafficking in unauthorized access devices. A comparison review of where and how to sell them would be a how-to guide for a federal crime, so I will not produce one.
If you arrived here looking for information about card verification codes in general, the material below covers the legitimate side of that topic.
What a CVV or CVC code actually is
The three-digit code on the back of most cards, or the four-digit code on the front of many American Express cards, is a verification value printed on the card but not stored in the magnetic stripe or the chip. It exists so a merchant can confirm that whoever is placing a card-not-present order physically holds the card.
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- CVV2 / CVC2 / CID: the printed code used in online and phone orders.
- CVV / CVC1: data encoded on the magnetic stripe, read at a terminal.
- Dynamic values: some modern cards generate a fresh code per transaction.
Where legitimate work exists in this space
Card security is a real industry with real jobs: fraud analytics, chargeback dispute handling, PCI DSS compliance auditing, tokenization engineering, and issuer-side risk modeling. Those roles pay for protecting cardholders, not for trading their data.
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If your own card data was exposed
Contact your issuer right away to freeze or replace the card, review recent statements line by line, and place a freeze or fraud alert with the major credit bureaus. Report the incident to the FTC, which runs the federal identity theft reporting process.
If you are a merchant
Never store CVV or CVC values after authorization, since PCI DSS forbids retaining them. Use a tokenization provider so your systems hold a reference value rather than the card number itself, and keep your checkout page on a current TLS configuration.