ClassMarker MCP server

Read ClassMarker groups, links, exams and recent results; manage question bank and access codes. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect ClassMarker50 free tool calls a month

What can I ask?

Turn on the ClassMarker connector, then ask in plain words. The AI picks the tools.

What you can do with ClassMarker in Claude and ChatGPT

For teachers and trainers who give online tests and exams with ClassMarker.

List our groups, links and exams

Lists the groups, links and exams the account can access, with the ids other tools need, including access-code lists for links.

Read recent finished test results

Reads recent finished results with name, score, percentage and pass or fail, across all groups or links or for one exam, a page at a time.

Browse the question bank

Lists question categories and questions, with text, type, category, points and correct options, and reads one question by id.

Add access codes to a link's list

Adds up to 100 access codes per call to the access-code list of a link, so those people can start the exam.

Changes data

Create or update a question

Reads a question first, then adds a new multiple choice, multiple response, true or false or essay question, or replaces an existing one.

Changes data

Create, rename or move question categories

Creates parent categories and categories under them, and renames them or moves a category to another parent.

Changes data

How do I connect ClassMarker?

Before you connect

The login page asks for your ClassMarker API key and ClassMarker API secret.

Create a key in ClassMarker under My Account → Webhooks / API Keys (see the API docs); give it access to the groups and links you want to use. API access needs an upgraded ClassMarker account. ClassMarker allows 30 requests per hour per key, so connecting uses one of them. Results contain test-taker names and emails; your key and secret are used only to call the ClassMarker API on your behalf and are never shown to anyone.

Claude claude.ai · Desktop

  1. Open Customize → Connectors, then click + Add → Add custom connector.
  2. Enter the name ClassMarker and this URL, then click Add:
    https://classmarker.usefulapi.io/mcp
  3. Claude opens the login page: enter your ClassMarker API key and ClassMarker API secret.
  4. In a chat, click + → Connectors and turn on ClassMarker.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

  1. Open Plugins, click +, then Add custom MCP server.
  2. Enter the name ClassMarker and this URL, choose OAuth as the authentication, confirm the warning and create it:
    https://classmarker.usefulapi.io/mcp
  3. ChatGPT opens the login page: enter your ClassMarker API key and ClassMarker API secret.
  4. In Plugins, install ClassMarker, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http classmarker https://classmarker.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "classmarker": {
      "url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "classmarker": {
      "type": "http",
      "url": "https://classmarker.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add classmarker --url https://classmarker.usefulapi.io/mcp
codex mcp login classmarker

Other clients

Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.

https://classmarker.usefulapi.io/mcp

Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ClassMarker API key and ClassMarker API secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Proper user$9/mo · $90/yr10,000 tool calls / month
Pro+per user$39/mo · $390/yr100,000 tool calls / month

Each paid plan covers this ClassMarker server only. Ask your AI to run classmarker_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with classmarker_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with classmarker_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 19

Show all 19 tools (the AI picks them for you)

Read only · 8

  • List groups, links and examsclassmarker_list_groups_links_exams
    List the groups, links and exams (tests) this API key can access, with the ids the other tools need (group_id, link_id, link_url_id, test_id, and access_list_id for links with an access-code list). Good first call. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Recent results across all groupsclassmarker_recent_group_results
    Recent finished test results taken in the key's groups (all groups, all exams), oldest first, PAGED by finish time: test-taker name, email, score, percentage, pass/fail, timing, certificate. Contains personal data: use small pages. Max look-back 3 months. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Recent results across all linksclassmarker_recent_link_results
    Recent finished test results taken through the key's links (all links, all exams), oldest first, PAGED by finish time: test-taker name, email, score, pass/fail, timing, access code, extra tracking fields, IP address, certificate. Contains personal data: use small pages. Max look-back 3 months. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Recent results for one group examclassmarker_recent_group_exam_results
    Recent finished results for ONE exam in ONE group (ids from classmarker_list_groups_links_exams), oldest first, PAGED by finish time. Contains personal data: use small pages. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Recent results for one link examclassmarker_recent_link_exam_results
    Recent finished results for the exam of ONE link (ids from classmarker_list_groups_links_exams), oldest first, PAGED by finish time. Contains personal data: use small pages. Counts as one of ClassMarker's 30 requests per hour per API key.
  • List question categoriesclassmarker_list_categories
    List the question-bank categories with their parent categories and ids (needed for creating and updating questions). Counts as one of ClassMarker's 30 requests per hour per API key.
  • List question-bank questionsclassmarker_list_questions
    List the questions of the question bank, 200 per page (page 1, 2, ...): question text, type, category, points, options, correct options, status. A full page means more may follow, so ask for the next page. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Get a questionclassmarker_get_question
    Get one question-bank question by id (ids from classmarker_list_questions). Counts as one of ClassMarker's 30 requests per hour per API key.

Changes data · 7

  • Add access codes to a listclassmarker_add_access_codes
    WRITE: add access codes (1-100 per call, up to 255 characters each; a list holds at most 20,000) to a link's access-code list, so those people can start the exam. The access_list_id comes from classmarker_list_groups_links_exams (links[].access_list_id). Only adds; removing codes is not offered. Does not count against the 30 requests per hour limit.
  • Create a parent categoryclassmarker_create_parent_category
    WRITE: create a new top-level question category. Returns its parent_category_id. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Rename a parent categoryclassmarker_update_parent_category
    WRITE: rename an existing parent category (overwrites its name). Counts as one of ClassMarker's 30 requests per hour per API key.
  • Create a categoryclassmarker_create_category
    WRITE: create a question category under a parent category. Returns its category_id. Counts as one of ClassMarker's 30 requests per hour per API key.
  • Update a categoryclassmarker_update_category
    WRITE: rename a category and/or move it to another parent (overwrites both fields: send the name and parent_category_id you want it to have). Counts as one of ClassMarker's 30 requests per hour per API key.
  • Create a questionclassmarker_create_question
    WRITE: add a new question to the question bank. Only multiplechoice, multipleresponse, truefalse and essay can be created. Returns the new question_id. For truefalse, give only correct_options ["A"] (True) or ["B"] (False). Counts as one of ClassMarker's 30 requests per hour per API key.
  • Update a questionclassmarker_update_question
    WRITE (overwrites): replace an existing question-bank question. Send the COMPLETE question (type, text, options, correct options, points, feedback), not only the changed fields; read it first with classmarker_get_question. Only multiplechoice, multipleresponse, truefalse and essay questions can be updated. Counts as one of ClassMarker's 30 requests per hour per API key.

Your usefulapi plan · 4

  • Usage status (free-tier meter)classmarker_usage_status
    Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
  • Request a missing featureclassmarker_request_feature
    Tell usefulapi that the user needs something the ClassMarker tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
  • Upgrade to Pro or Pro+classmarker_upgrade
    Get a paid plan for ClassMarker (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
  • Cancel the Pro subscriptionclassmarker_cancel_subscription
    Cancel the caller's ClassMarker Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run classmarker_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with ClassMarker in Claude or ChatGPT?

List our groups, links and exams. Read recent finished test results. Browse the question bank. Add access codes to a link's list. Create or update a question. Create, rename or move question categories. See what you can do for the details.

Is this an official ClassMarker product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by ClassMarker. The server calls the ClassMarker API with your own ClassMarker access, so it sees only the data that your account can see.

Can I connect ClassMarker to Claude or ChatGPT?

Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.

What do I need to connect?

The login page asks for your ClassMarker API key and ClassMarker API secret. See Before you connect for where to find them.

Do I put my ClassMarker key or an Authorization header in the client config?

No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your ClassMarker API key and ClassMarker API secret. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.

How do you keep my ClassMarker credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the ClassMarker API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in ClassMarker.

Can the AI change my ClassMarker data?

Yes, if you approve it. 7 of the 15 ClassMarker tools can create or change data. The other 8 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this ClassMarker server only. Cancel any time: your paid plan then runs to the end of the paid period. Run classmarker_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run classmarker_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run classmarker_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a ClassMarker tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with classmarker_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.

Which AI clients can I use?

Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.

This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.

Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.

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