Should You Grade Mystery Zone #137 from Skyridge?
Free PSA grading EV calculator pre-loaded with live market data for Mystery Zone #137. Current PSA 10 gem rate is 33.9% based on 56 graded copies. PSA 10 sales average $292.67 vs a raw market of $7.99. Expected value of grading: $34.49 (44% ROI). Verdict: Decent — proceed with caution.
Skyridge · #137 · Uncommon
Default-tier verdict
Decent — proceed with caution+$34 (+44% ROI)
Based on raw market $7.99, PSA 10 $292.67, gem rate 33.9% (56 graded). Adjust inputs below for your card's exact condition.
About this calculator
This page computes the expected value (EV) of submitting Mystery Zone #137 to PSA for grading. EV factors in real PSA population data (gem rates), live market prices for raw and graded copies, and PSA's tiered fee structure including upcharges when a card's graded value exceeds the tier's Max Insured Value. Adjust the inputs to match your card's exact condition for a personalized recommendation.
PSA population summary
| Grade | Population | Rate |
|---|---|---|
| PSA 10 | 19 | 33.9% |
| PSA 9 | 30 | 53.6% |
| PSA 8 | 5 | 8.9% |
| PSA 7 | 1 | 1.8% |
