Blastoise

Holo Rare · vintage

← Base Set

Fair value (PSA 10)

$5.5K

MeasuredVery high · 88%

30-day momentum

+4.50%

vs set: +2.8% · vs market: +2.2%

Liquidity

Spread 4.0% · vol 10%

Supply pressure

Listing v 22 · sales v 20

All grades

Each row is one grade. Fair value, 30-day momentum, liquidity, and per-grade methodology version.

Grader	Grade	Fair value	30d	Liquidity	Comp confidence
PSA	10	$5.5K	+4.50%	62	Very high · 88%

Vintage backcast (1999 → 2021)

Backcast

Pre-2022 values modeled by GPT-5 from landmark sales, pop snapshots, narrative context, and CPI normalization. Always shown separately from measured data — never blended into the same trace.

Year	Low	Base	High	Confidence
2000	$12.00	$18.00	$28.00	Low · 40%
2005	$30.00	$45.00	$70.00	Low · 45%
2010	$80.00	$110	$160	Low · 50%
2015	$220	$320	$460	Moderate · 55%
2018	$520	$700	$950	Moderate · 60%
2020	$1.4K	$1.9K	$2.4K	Moderate · 66%
2021	$3.4K	$4.4K	$5.6K	Moderate · 70%

Reproducibility: model gpt-5-2026-q1 · prompt hash stub-prompt-hash-v1 · methodology v2026.04.0