What it does
Ask things like “What is a PSA 10 1986 Fleer Michael Jordan worth?” or “Compare a PSA 9 and PSA 10 base set Charizard.” The assistant looks the card up in Slabline and answers with Slabline’s current value, credited to Slabline, with a link to the card’s page for the full sales history.
Values are Slabline-derived from real comparable sales, updated daily. Individual sale records are not returned through the tool.
https://slabline.ai/mcpNo login, no API key. Works in any assistant that supports MCP connectors.
ChatGPT
In the app directory- Open ChatGPT and go to Apps.
- Search “Slabline” and add it.
- Ask: “What is a PSA 10 1986 Fleer Michael Jordan worth?”
Claude
Custom connector- Settings → Connectors → Add custom connector.
- Name it Slabline and paste the address above.
- Ask about any graded card.
Microsoft Copilot Studio
For business Copilot- In your agent, add a tool → Model Context Protocol.
- Paste the address above (no authentication).
- Save and test with a card question.
Cursor · VS Code · Windsurf · Claude Code · Gemini CLI
Developer tools- Add a remote MCP server in the tool’s settings.
- Use the address above, transport “Streamable HTTP”, no auth.
- Also listed in the official MCP Registry as ai.slabline/slabline.
Using Gemini, Perplexity or Copilot chat? They can’t add connectors yet, but they read the web: ask them about a card and they can cite Slabline’s public card pages.
Tools
All four tools are read-only: they look things up and never change anything.
search_cardsSearch graded cards- Find cards in Slabline’s catalogue of 1.5M+ graded cards (PSA, BGS, SGC, CGC) by player, set or year. Up to 10 matches with their current Slabline value.
value_cardGet a card value- One card’s current Slabline value: graded market value, raw/ungraded value, and the total across grades. Values come from real comparable sales.
searchSearch cards- The same search in the shape ChatGPT’s connectors expect: matches, each with an id for fetch.
fetchFetch a card- One card by id (from search): its graded value, raw value and across-grades total.
Limits
The tool is free with a daily usage limit to keep it fast for everyone. If a limit is reached the tool says so and resets the next day (UTC).
Your data
The tool needs no account and receives only the card query the assistant sends, never your name, email or conversation. We keep daily aggregate counts and a one-way hash of the requesting address for rate limiting. Details are in the privacy policy (section 5, “AI Assistant Integrations”).
Support
Questions, a value that looks wrong, or a card we’re missing: brian@hobbysmartcases.com. Slabline is made by Hobby Smart Case, Inc., Boynton Beach, Florida.
