carddata

carddata is a small local bridge to the hosted HobbyCardIndex card-prices MCP server, which tracks current sold prices for sports and trading cards. You can describe a card the way a collector would — year, set, player or character, card number — and get back matches with their raw and PSA 10 prices, then pull one card in full to see what it sold for at every grade: raw, PSA 7 through PSA 10, BGS 9.5, CGC 10 and SGC 10. You can also read the plan catalogue to see what the commercial API and app plans cost and cover.

The bridge holds no prices of its own. It answers the tool list locally, exactly as captured from the live endpoint, and forwards each tool call upstream, returning whatever comes back untouched. The surface here is three read-only tools. The original server also offered a checkout tool; that tool is intentionally not part of this rebuild, so nothing in this package starts a purchase or handles payment.

Tools

• search_cards — find a card and its current sold price. Required: query (year, set, player or character, and card number if known, 2 to 120 characters). Optional: category (for example baseball, basketball, football, hockey, soccer, pokemon, magic, yugioh, one piece) and limit (1 to 5 matches, default 5). Returns up to 5 matching cards with the raw (ungraded) and PSA 10 price, a card_id, and the link to the card page. Needs a HobbyCardIndex API key.
• get_card_prices — current sold prices for one card at every grade. Required: card_id (the id returned by search_cards). Returns raw, PSA 7, PSA 8, PSA 9, PSA 10, BGS 9.5, CGC 10 and SGC 10 prices in US dollars, with the link to the card page for recent sales and price history. Needs a HobbyCardIndex API key.
• list_plans — read the plans on offer right now. Takes no arguments and works without an API key. Returns the Commercial API sizes (requests, photo scans, sold-sale lookups, cert lookups) and the app plans Pro, Dealer and Enterprise, with monthly prices in US dollars, the terms and how to buy. This tool only reads the catalogue; it starts no purchase.

Configuration

• HOBBYCARDINDEX_MCP_URL (optional) — override the upstream endpoint. Defaults to https://hobbycardindex.com/api/v1/mcp. (The override hook is this rebuild's own labelled reconstruction.)
• HOBBYCARDINDEX_API_KEY (optional) — when set, every upstream request carries an X-API-Key: <key> header, for the caller's own HobbyCardIndex API key. When it is not set, no key header is sent. (The header name is pinned by the original's registry record; the record pins no package env name, so forwarding the key from this env var is a labelled reconstruction — the original surface was captured keyless.)

Forwarding mechanics

On the first tool call the client opens a streamable HTTP session upstream: a JSON-RPC initialize request (protocolVersion 2025-03-26, clientInfo name carddata), then a notifications/initialized notification, then the tools/call request carrying the caller's arguments unchanged. When the upstream answers initialize with an Mcp-Session-Id header, that value rides on every later request of the session, which is reused for the life of the process. Replies may arrive as plain JSON or as server-sent events; both are read.

Successful upstream results pass through verbatim, including any isError flag the upstream sets. Failures — a JSON-RPC error, a non-2xx status, an unreadable response, or a request that cannot be completed — come back as an isError result whose text starts with carddata error: (this rendering is this rebuild's own labelled reconstruction).

CLI

Each tool is also a subcommand taking one JSON argument string:

npx @reneturcios/carddata search_cards '{"query":"1989 Upper Deck Ken Griffey Jr 1"}'
npx @reneturcios/carddata get_card_prices '{"card_id":12345}'
npx @reneturcios/carddata list_plans '{}'
npx @reneturcios/carddata --version

Exit codes: 0 on success, 1 on an isError result, 2 on a usage error.

MCP server

npx -y @reneturcios/carddata mcp

MCP client config:

{
  "mcpServers": {
    "carddata": {
      "command": "npx",
      "args": ["-y", "@reneturcios/carddata", "mcp"]
    }
  }
}

Docker

docker run -i ghcr.io/cloudcorprecords/carddata
docker run --rm ghcr.io/cloudcorprecords/carddata --version

The container's default command is mcp, so the first form is a stdio MCP server; any other arguments reach the CLI normally.

Development

npm install
npm run build
npm test
npm run dev

The test suite runs entirely against a stubbed JSON-RPC upstream — no live network calls.

License

MIT — see LICENSE.