"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

Federated search of books and papers, BibTeX/RIS citations, open-access retrieval and reading.

Free: turn your AI chats into spaced-repetition vocabulary. 13 tools, reads and writes.

Riddle.com is a no-code platform for quizzes, surveys, personality tests, prediction games, interactive graphics, and leaderboards. Use the MCP to create, edit and analyze content.

DeepMark helps teachers deliver rapid, consistent marking with meaningful feedback for every student — in a fraction of the time. What once took a week, now takes one free period.

Dream symbol interpretation and dream-dictionary lookups for AI agents, one API key.

Recherche d'offres de stage et d'alternance en France via le réseau iQuesta.com

8 curriculum, classroom, accommodations and exam-prep skill products. 5 of 7 free.

7 research navigation, thesis, note-taking and citation skill products. 6 of 8 free.

Build, publish and analyze quizzes, polls, forms and personality tests. Riddle account required.

Quran: Quran API Service with 90+ different languages and 400+ translations.

Real Monte Carlo simulation of a compound event/conditional probability. Paid via x402.

Fetch real California Notary Public exam practice questions and grade answers in-chat.

Search papers, format citations in 60 styles, and verify bibliographies against scholarly sources.

DOAJ MCP — Directory of Open Access Journals

Sefaria MCP — the free digital library of Jewish texts.

Wiktionary MCP — multilingual dictionary via Wikimedia REST + MediaWiki Action API

Universities MCP — Hipolabs Universities API (free, no auth)

Courses that argue back: learn adaptively, build real work, then defend it to an AI stakeholder.

Wordnik English dictionary: definitions, examples, related words, WotD.

300+ African scholarships, GPA conversion & 1,700+ visa routes for postgrad students.