Accuracy & corrections

01Standards

Per-card price accuracy target: ±2% vs. spot-checked TCGPlayer Market across a random 500-card audit, daily.

Last 30-day audit: 99.4% within tolerance. The 0.6% miss was disproportionately on borderless / list / serialized printings — we shipped a fix April 11.

Signal precision (HIGH band, last 90 days): 78% of HIGH signals corresponded to ≥10% directional move in the labeled direction within 14 days. Methodology page has the full table.

02Recent corrections

April 11, 2026 — Foil-Etched printings from Commander Masters were under-priced by ~14% for 36 hours due to a SKU mapping bug. Fixed; affected users were notified by email.

March 28, 2026 — A vendor feed delivered stale buylists for 11 hours. We held alerts during the outage rather than firing on stale data.

February 19, 2026 — A misclassified Universes Beyond promo briefly inflated a volume-anomaly signal. Suppressed within 90 minutes.

03Report a bad price

Click the "Report" link under any price chart, or email accuracy@cardmind.app with a screenshot and source.

We respond within 1 business day, fix within 3 if it's real, and post substantive corrections to this page within 7.