4-letter X (Twitter) handles benefit from the platform's long history — since the market here dates back to the mid-2000s, account age and any attached public history carry more weight than on newer platforms, even at this more accessible length tier.
Generally yes — X's market has existed since 2006, giving genuinely old accounts more history (and often more value) than an equivalent handle on a younger platform.
Open the vault, pick a listed username, and DM the contact handle shown on the site to arrange payment — there's no cart/checkout, it's a direct conversation with the seller.
Crypto-only. See the Terms of Service for the full payment and delivery policy, including the sale-finality and 72-hour issue window.