cardmarket-mcp

net.bigfloppy.cardmarket/cardmarket-mcpcardmarket.bigfloppy.netstreamable-httpv0.1.0Scanned 2 hours ago

Read-only BYO-key MTG/TCG pricing MCP with repricing suggestions. AI-authored.

9 tools: 3 change things and 6 only read.

Reads private data · 0
Reads text others write · 9
Can send data out · 0
6 findings

Anlyon alternative

3 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

9 tools

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

reprice_suggestSuggests a new price for ONE of your listings.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Suggests a new price for ONE of your listings. SUGGESTION ONLY — this server never creates, edits or deletes listings. Provide your current price plus either (a) marketplace='cardmarket' with idProduct (fetches live data with your creds), or (b) marketplace='manual' with your own reference numbers. Strategies: competitive (default), undercut_lowest, match_trend, premium.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
scryfall_card_pricesFREE tier.Reads text others write1 finding
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...ll bulk-derived data, updated daily. No credentials."
  What this check looks for
Description, as the server wrote it
FREE tier. Fuzzy-name card lookup returning all printings' prices (usd, usd_foil, eur, eur_foil, tix) from Scryfall bulk-derived data, updated daily. No credentials.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
tcgplayer_price_guideMarket/low/mid/high/direct-low prices per subtype (Normal/Foil) for up to 50 TCGplayer product ids.Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Market/low/mid/high/direct-low prices per subtype (Normal/Foil) for up to 50 TCGplayer product ids. Requires your own TCGplayer keys. Read-only.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true

Only reads 6Looks things up and changes nothing.Show 6 read-only tools

cardmarket_compare_sellersLists current offers for a Cardmarket product (cheapest first) with seller, country, condition, language, foil, quantity, plus price distribution stats.Reads text others write1 finding
Why it is in this group
- The name "cardmarket_compare_sellers" says "compare": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...ller type. Requires your own Cardmarket credentials. Read-only."
  What this check looks for
Description, as the server wrote it
Lists current offers for a Cardmarket product (cheapest first) with seller, country, condition, language, foil, quantity, plus price distribution stats. Optionally filter by min condition (MT,NM,EX,GD,LP,PL,PO), language id, foil, seller type. Requires your own Cardmarket credentials. Read-only.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
cardmarket_price_guideGet the Cardmarket price guide (SELL, LOW, LOWEX, AVG, TREND, foil variants, 1/7/30-day averages) for a product id.Reads text others write1 finding
Why it is in this group
- The description's first verb is "get": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...roduct id. Requires your own Cardmarket credentials. Read-only."
  What this check looks for
Description, as the server wrote it
Get the Cardmarket price guide (SELL, LOW, LOWEX, AVG, TREND, foil variants, 1/7/30-day averages) for a product id. Requires your own Cardmarket credentials. Read-only.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
cardmarket_product_searchSearch Cardmarket products by name (Magic by default, idGame=1).Reads text others write1 finding
Why it is in this group
- The name "cardmarket_product_search" says "search": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...me=1). Requires your own Cardmarket API credentials in env (CARDMARKET_APP_TOKEN, CARDMARKE..."
  What this check looks for
Description, as the server wrote it
Search Cardmarket products by name (Magic by default, idGame=1). Requires your own Cardmarket API credentials in env (CARDMARKET_APP_TOKEN, CARDMARKET_APP_SECRET, CARDMARKET_ACCESS_TOKEN, CARDMARKET_ACCESS_TOKEN_SECRET). Read-only.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
cardmarket_seller_stockRead-only view of a given Cardmarket seller's public stock (username or user id), optionally filtered by game and a name search, so you can compare their prices against market.Reads text others write1 finding
Why it is in this group
- The description's first verb is "read": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...st market. Requires your own Cardmarket credentials."
  What this check looks for
Description, as the server wrote it
Read-only view of a given Cardmarket seller's public stock (username or user id), optionally filtered by game and a name search, so you can compare their prices against market. Requires your own Cardmarket credentials.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
scryfall_search_cardsFREE tier.Reads text others write1 finding
Why it is in this group
- The name "scryfall_search_cards" says "search": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Info
  The description mentions "credentials".
  Matched text
  description: "...se with the paid-API tools. Requires no credentials."
  What this check looks for
Description, as the server wrote it
FREE tier. Search Magic cards with Scryfall syntax (e.g. 'o:flying t:dragon'). Returns ids, set info, and USD/EUR/TIX prices, plus Cardmarket/TCGplayer product ids for use with the paid-API tools. Requires no credentials.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
tcgplayer_product_searchSearch TCGplayer catalog products by name.Reads text others writeNo findings
Why it is in this group
- The name "tcgplayer_product_search" says "search": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Search TCGplayer catalog products by name. Magic is categoryId 1. Requires your own TCGplayer API keys in env (TCGPLAYER_CLIENT_ID, TCGPLAYER_CLIENT_SECRET). Read-only. Note: TCGplayer is not currently issuing new API keys to everyone; this works only if you already have access.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data or outbound.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write9: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; cardmarket_compare_sellers
cardmarket_price_guide
cardmarket_product_search
cardmarket_seller_stock
reprice_suggest
scryfall_card_prices
scryfall_search_cards
tcgplayer_price_guide
tcgplayer_product_search
Can send data out0: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

6 info

Infoscryfall_search_cards
The description mentions "credentials".
Matched text
description: "...se with the paid-API tools. Requires no credentials."
What this check looks for
Infoscryfall_card_prices
The description mentions "credentials".
Matched text
description: "...ll bulk-derived data, updated daily. No credentials."
What this check looks for
Infocardmarket_product_search
The description mentions "credentials".
Matched text
description: "...me=1). Requires your own Cardmarket API credentials in env (CARDMARKET_APP_TOKEN, CARDMARKE..."
What this check looks for
Infocardmarket_price_guide
The description mentions "credentials".
Matched text
description: "...roduct id. Requires your own Cardmarket credentials. Read-only."
What this check looks for
Infocardmarket_compare_sellers
The description mentions "credentials".
Matched text
description: "...ller type. Requires your own Cardmarket credentials. Read-only."
What this check looks for
Infocardmarket_seller_stock
The description mentions "credentials".
Matched text
description: "...st market. Requires your own Cardmarket credentials."
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http cardmarket https://cardmarket.bigfloppy.net/mcp

claude mcp add --transport http cardmarket https://cardmarket.bigfloppy.net/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__cardmarket__scryfall_search_cards",
      "mcp__cardmarket__cardmarket_product_search",
      "mcp__cardmarket__cardmarket_price_guide",
      "mcp__cardmarket__cardmarket_compare_sellers",
      "mcp__cardmarket__cardmarket_seller_stock",
      "mcp__cardmarket__tcgplayer_product_search"
    ],
    "ask": [
      "mcp__cardmarket__scryfall_card_prices",
      "mcp__cardmarket__tcgplayer_price_guide",
      "mcp__cardmarket__reprice_suggest"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as cardmarket. Review it before you use it.

Capability tags behind 9 rules

mcp__cardmarket__scryfall_search_cards untrusted-input
mcp__cardmarket__scryfall_card_prices untrusted-input
mcp__cardmarket__cardmarket_product_search untrusted-input
mcp__cardmarket__cardmarket_price_guide untrusted-input
mcp__cardmarket__cardmarket_compare_sellers untrusted-input
mcp__cardmarket__cardmarket_seller_stock untrusted-input
mcp__cardmarket__tcgplayer_product_search untrusted-input
mcp__cardmarket__tcgplayer_price_guide untrusted-input
mcp__cardmarket__reprice_suggest untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/net.bigfloppy.cardmarket/cardmarket-mcp/verify?hash=a0a692a07e85013f724361183149d9a500609d72c1e91e5f52a7436586b5653f" | jq -e '.changed == false'

Pinned hash a0a692a07e85, from Nov 2, 2026, 15:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/net.bigfloppy.cardmarket/cardmarket-mcp/changes.xml

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Badge

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Source: MCP Registry. Synced Nov 2, 2026, 15:18 UTC.