Connect to your AI

Connect an AI assistant that supports remote MCP servers, starting with ChatGPT, to Relicmark's public card ledger. It is free and read-only.

Relicmark MCP server URL

Select and copy this address, including the final slash.

Connect ChatGPT

ChatGPT is live now. Set it up once, then ask about any card in plain language.

In ChatGPT on the web, open Plugins (or Settings → Plugins → Browse directory).
Choose Add → Add custom MCP server.
Name it Relicmark, set the server URL to https://relicmark.com/mcp/ and set Authentication to No authentication. No Relicmark sign-in is needed. Confirm, then choose Connect.
Start a new chat, type @Relicmark and ask, for example: “What is the Jack Hughes 2019-20 Young Guns PSA 10 worth on Relicmark?” ChatGPT shows the Relicmark ledger card with the composite price, its confidence and range, and the verified sales, and links to the Relicmark page it used.

Custom MCP servers depend on your ChatGPT plan and workspace settings; a workspace admin may need to allow them.

Other assistants

Claude: coming soon.
Gemini: coming soon.

What it can find

Card ledgers: all 792 exact card-and-grade ledgers in the Relicmark directory (757 Upper Deck Young Guns hockey cards, 13 baseball cards, 10 basketball cards, 10 football cards and 2 Pokémon cards). Each answer carries the Relicmark composite price with its likely range and confidence where one exists, the evidence counts, and the source-linked sales marked counted, pending, held or excluded.
Research references: 27 Pokémon and baseball cards reported in issuers' SEC filings. They are labelled as research, are not ledger records, and cannot be saved or watched.

Searches match the player or Pokémon name, season or year, set, card number and grade. A grade in your question is matched exactly: if Relicmark lists a card only at PSA 10, a PSA 9 question gets no match, and the assistant is told which grade is listed instead.

What it does not do

The connection cannot see your account, My Collection or Watchlist, and cannot add or change anything. It does not authenticate a physical card or its grade. The composite it returns is an estimate, not an appraisal. Open the card page linked in each answer for its sources and limitations.

View the public data and feeds or browse card ledgers.