Should You Grade Blastoise-GX #SM189 from SM Black Star Promos?
Free PSA grading EV calculator pre-loaded with live market data for Blastoise-GX #SM189. Current PSA 10 gem rate is 26.8% based on 2,015 graded copies. PSA 10 sales average $760.50 vs a raw market of $20.54. Expected value of grading: $147.98 (163% ROI). Verdict: Grade It.
SM Black Star Promos · #SM189 · Promo
Default-tier verdict
Grade It+$148 (+163% ROI)
Based on raw market $20.54, PSA 10 $760.50, gem rate 26.8% (2,015 graded). Adjust inputs below for your card's exact condition.
About this calculator
This page computes the expected value (EV) of submitting Blastoise-GX #SM189 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 | 540 | 26.8% |
| PSA 9 | 1,010 | 50.1% |
| PSA 8 | 290 | 14.4% |
| PSA 7 | 86 | 4.3% |
