The data behind Prospect Card Radar

Name: Prospect Card Radar — Live MLB Prospect Card Market Data
Creator: Prospect Card Radar
License: https://prospectcardradar.com/methodology

Every chart, leaderboard, and price on this site is powered by public JSON endpoints. Use them for your own analysis, embed our charts, or cite our averages — just credit Prospect Card Radar.

refreshed multiple times per day

/api/prices-all

Live prospect prices — all products

Current Bowman Chrome 1st auto, Topps Pro Debut, Bowman’s Best averages + listings spread for every top-300 prospect.

/api/prospects-catalog

Top 300 prospect catalog

Composite ranks, source ranks (MLB / FG / BA), team, position, bio. The canonical prospect index.

/api/history

30-day daily price history

Per-day BC 1st auto averages going back 30 days. Powers the Arc, the Delay Clock, and the Bump.

/api/prospect-activity

Activity + injured list

Per-prospect game gap signal plus hard MLB.com IL data (type, start date, injury description).

/api/best-deals

Under-market listings

Current eBay listings priced meaningfully below their card type’s typical range.

/api/delay-clock

Market reaction time

Median days between a hot streak and the card market reacting — plus today’s “overdue” prospects.

What’s in here

Prospect Card Radar tracks live eBay listings for the top 300 MLB prospects, computes apples-to-apples market averages, and cross-references them against minor-league performance and prospect-rank signals from MLB Pipeline, Fangraphs, and Baseball America.

Price averages filter to base 1st autographs. Numbered parallels, refractor colors, superfractors, and printing plates are excluded so the figures stay comparable across product lines.
Raw and PSA 10 averages are tracked separately. The PSA premium (graded ÷ raw) typically sits in the 3-4x range and varies by prospect tier.
Historical data goes back 30 days for daily averages and continues to grow as the dataset matures.
Injured list status comes from the public MLB Stats API — official transactions, not inference.

Usage & attribution

Endpoints are public and free. If you reference the data publicly, please credit Prospect Card Radar and link back. For methodology details see /methodology.

For embeddable chart widgets, see the share buttons on /arc, /delay-clock, and /map.