list_categories — Every trivia category with the numeric id used by the other tools.
category_counts — How many questions a category holds, split by difficulty. Useful before requesting a quiz.
global_counts — How many questions the whole trivia database holds, overall and per category name.
get_questions — Fetch trivia questions with their answers as structured data, for your own formatting.
quiz — A ready-to-read quiz: numbered questions with options and an answer key at the end. Filter by category and difficulty.
session_token — Get or reset a session token. Pass it to quiz or get_questions so the same question is never served twice.
compare_categories — Put two categories side by side: total questions, the easy/medium/hard split with shares, and which of the pair is deeper in hard questions.
quiz_readiness — Pre-flight a planned quiz: does this category hold enough questions at that difficulty for the amount asked, and what is the largest amount it can serve if not.
category_quality — Rank categories by their share of human-verified questions and show pending and rejected counts, so a quiz is not built from a poorly reviewed category.

Setup

No setup. Questions come from the public Open Trivia DB API.

Part of awesome-mcps.

Premium tools

These tools need a license key:

quiz_exploitability
distractor_quality

Buy a key at https://mcp-marketplace.io/server/io-github-mrfentmen-opentdb-mcp and set it in your MCP client config:

"env": { "MCP_LICENSE_KEY": "mcp_live_..." }

The key is checked against MCP Marketplace, cached for 24 hours, and keeps working offline once one check has succeeded. Every other tool on this server stays free.