Sports Card Agent
Connects to eBay's API for real-time pricing data and Ball Don't Lie for NBA stats, plus NFL and MLB player data. You get nine tools covering price lookups, market trend analysis with arbitrage detection, grading ROI calculations for PSA/BGS/SGC, and player performance tracking across basketball, football, and baseball. The vintage card analysis covers 40+ sets from 1909 T206 through 2000 Playoff Contenders with grade-specific pricing. Useful if you're building card collecting tools, investment dashboards, or just need to answer "should I grade this card" without manually cross-referencing eBay sold listings against grading fees. Works with mock data out of the box, but you'll want the free API keys for production use.
- GitHub stars
- 1
- tools
- 9
- auth
- Secret needed
- transport
- STDIO
- env vars
- 3
- last updated
- Mar 24, 2026
Tools
9 toolsPublic tool metadata for what this MCP can expose to an agent.
card_price_lookupReal-time sold and active prices from eBay. Supports any sport, brand, year, or grading.
Real-time sold and active prices from eBay. Supports any sport, brand, year, or grading.
No parameter schema in public metadata yet.
card_market_analysisTrend analysis comparing sold vs asking prices. Detects arbitrage opportunities where cards are listed below market value.
Trend analysis comparing sold vs asking prices. Detects arbitrage opportunities where cards are listed below market value.
No parameter schema in public metadata yet.
player_stats_lookupMulti-sport player stats (NBA/NFL/MLB) with card market insights based on performance.
Multi-sport player stats (NBA/NFL/MLB) with card market insights based on performance.
No parameter schema in public metadata yet.
nfl_stats_lookupNFL passing, rushing, receiving, and defensive stats with card market insights.
NFL passing, rushing, receiving, and defensive stats with card market insights.
No parameter schema in public metadata yet.
mlb_stats_lookupMLB batting (AVG, HR, RBI, OPS) and pitching (ERA, K, WHIP) stats with card insights.
MLB batting (AVG, HR, RBI, OPS) and pitching (ERA, K, WHIP) stats with card insights.
No parameter schema in public metadata yet.
grading_roi_calculatorCalculates whether grading a card is profitable. Compares raw vs graded prices for PSA, BGS, and SGC with fee-adjusted ROI.
Calculates whether grading a card is profitable. Compares raw vs graded prices for PSA, BGS, and SGC with fee-adjusted ROI.
No parameter schema in public metadata yet.
card_investment_advisorBuy/sell/hold recommendations combining market trends with player performance data across all 3 sports.
Buy/sell/hold recommendations combining market trends with player performance data across all 3 sports.
No parameter schema in public metadata yet.
trending_playersIdentifies NBA players with breakout performances whose cards are likely rising in value.
Identifies NBA players with breakout performances whose cards are likely rising in value.
No parameter schema in public metadata yet.
vintage_card_analysisEra-specific analysis for pre-2000 cards. Covers 40+ iconic sets from 1909 T206 to 2000 Playoff Contenders with grade-based pricing.
Era-specific analysis for pre-2000 cards. Covers 40+ iconic sets from 1909 T206 to 2000 Playoff Contenders with grade-based pricing.
No parameter schema in public metadata yet.
Sponsors
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EBAY_APP_IDsecreteBay API application ID (register free at developer.ebay.com)
EBAY_CERT_IDsecreteBay API certificate ID (register free at developer.ebay.com)
BALLDONTLIE_API_KEYsecretBall Don't Lie API key for player stats (register free at app.balldontlie.io)
Readme
Sports Card Agent
An MCP server that gives AI agents expert-level sports trading card data. Covers pricing, market analysis, arbitrage detection, grading ROI, investment advice, player stats (NBA/NFL/MLB), vintage card analysis, and trending player alerts.
9 tools. 3 sports. 40+ vintage sets. Zero manual research.
Tools
Pricing & Market
| Tool | Description |
|---|---|
card_price_lookup | Real-time sold and active prices from eBay. Supports any sport, brand, year, or grading. |
card_market_analysis | Trend analysis comparing sold vs asking prices. Detects arbitrage opportunities where cards are listed below market value. |
Player Stats
| Tool | Description |
|---|---|
player_stats_lookup | Multi-sport player stats (NBA/NFL/MLB) with card market insights based on performance. |
nfl_stats_lookup | NFL passing, rushing, receiving, and defensive stats with card market insights. |
mlb_stats_lookup | MLB batting (AVG, HR, RBI, OPS) and pitching (ERA, K, WHIP) stats with card insights. |
Analysis & Strategy
Details
- Repository
- github.com/rjexile/sports-card-agent
- Category
- AI & LLM Tools
- Package
sports-card-agent- Transport
- STDIO
- Auth
- Required
- Registry
- MCP registry, active
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