We cannot help you buy stolen card data
You asked for a buying guide for the "joker portal" and similar sites that sell CVV, fullz, and dumps. Those products are stolen payment card records. Buying, selling, or possessing them is illegal in the United States and most countries. We do not write guides for criminal marketplaces. This refusal is not a moral judgment about you. It is a legal and ethical limit. If you are researching fraud for legitimate security work, there are lawful ways to do that. If you are a victim, you can report the crime. If you are just curious, know that these sites are often scams themselves. They steal from buyers too.
What you should do instead
If you want to learn about payment security, use official resources from card networks and banks. If you want to test fraud defenses, work with a licensed penetration testing firm and get written authorization. If you have been targeted by identity theft, contact the Federal Trade Commission and your local police. If you have information about a carding site, report it to the FBI's Internet Crime Complaint Center. Do not send money to any "joker portal" or similar vendor. You will likely lose it, and you may face prosecution. The legal risks include fines and prison time under laws like the Computer Fraud and Abuse Act and wire fraud statutes. The market for stolen data also fuels broader harm, from small business losses to funding for organized crime.
Frequently asked questions
Can I buy CVV data legally?
No. Valid payment card data belongs to the cardholder and the issuing bank. Selling or buying it without authorization is a crime.
Is the joker portal a real marketplace?
Many sites with that name are phishing traps or law enforcement stings. They may take your cryptocurrency and give you nothing.
Where can I report a carding site?
Use the FBI IC3 or the FTC's identity theft reporting portal. Those are the appropriate authorities.