A single-letter or single-digit username is the ceiling of rarity on any platform — there are only 26 letters and 10 digits, meaning a maximum of 36 of them can ever exist, full stop. Most changed hands privately years ago and rarely surface on the open market.
With so few in existence, single-character handles tend to move through direct, negotiated deals between known parties rather than sitting in a public listing. When one does appear publicly, it's treated as a rare event, not routine inventory.
If you're specifically hunting a single-character handle, it's worth flagging interest with a seller directly rather than waiting for one to appear in a general listing feed.
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.