Frequently Asked Questions Q. What is PSA appraisal/PSA10? June 25, 2026 07:05 Updated PSA stands for “Professional Sports Authenticator.” It is the world’s largest and most widely used card grading service. PSA 10 refers to the highest grade in the PSA grading scale, indicating a virtually perfect card. Related articles Who can use this service? I forgot my password. The website stopped working/the page refreshed before I saw my results/I skipped my results on accident.