PSA (Professional Sports Authenticator) is the industry’s leading third-party authentication and grading service for trading cards, sports memorabilia, and collectibles. Founded in 1991, PSA evaluates cards for authenticity and condition, assigning a grade on a 1-10 scale (with “PSA Gem Mint 10” representing flawless condition) before encapsulating each card in a tamper-evident holder for protection and display.

A PSA-graded card carries added trust and value for collectors and investors, since the grade is backed by a standardized, widely recognized process. Cards graded by PSA are easier to buy, sell, and trade with confidence, and are often more sought-after in the secondary market than raw (ungraded) cards.