A reference list of the third-party authenticators and graders serious collectors and major auction houses tend to recognize.
Last updated: 2026-05-20
Authentication and grading are different things. Authentication answers “is this what the seller says it is?” Grading answers “what condition is it in?” Many of the companies below offer one, the other, or both — depending on category.
Professional Sports Authenticator
One of the most widely recognized authenticators in sports cards and autographs. Population reports are publicly searchable.
Specialties: Sports cards grading; Autograph authentication via PSA/DNA
Visit PSABeckett Authentication Services & Beckett Grading Services
Strong recognition in trading cards. BAS is a well-known autograph authenticator alongside JSA and PSA/DNA.
Specialties: Card grading; Autograph authentication (BAS)
Visit BeckettJames Spence Authentication
Widely accepted by major auction houses. Offers full LOAs and pre-cert services at major shows.
Specialties: Autograph authentication across sports, music, entertainment, and historical
Visit JSASportscard Guaranty Corporation
Frequently chosen for vintage cards. Known for relatively fast turnaround at common service levels.
Specialties: Vintage card grading
Visit SGCCertified Guaranty Company
The dominant grader in comic books. Also operates CGC Cards for trading cards and CGC Home Video, Music, and other specialty divisions.
Specialties: Comic book grading and encapsulation; Trading card grading (CGC Cards)
Visit CGCCard Authority Services
Smaller-volume option in the cards space. Verify acceptance with the auction house or marketplace you plan to sell through.
Specialties: Card authentication
Visit CAS