"How to obtain an API key" matching MCP servers:

Perfume database API with verified notes: 1,500+ perfumes, 160+ houses, 400+ raw materials in a fragrance ingredients database. 12 tools over MCP and REST, OpenAPI spec, free and keyless, answers in 10 languages. Look up a note or raw material and get the perfumes that use it, or a perfume and get its full top, heart and base pyramid. Built by Scento.

Provides access to API Ninjas Random Word API to generate random words by type (noun, verb, adjective, adverb) for creative writing, games, and language learning applications.

Read-only MCP connector that serves the Run It on AI book. The index and Implementation Blocks are free; full chapters and playbooks unlock with a license key included with the book.

Enables local-first personal growth execution where an AI agent maintains the plan and daily tasks, while the user retains control of goals and final decisions.

Enables MCP-compatible clients to generate simple study plans from a subject, level, and available minutes, and to produce beginner-level practice questions, all locally without an API key.

Enables querying the Urban Institute's Education Data Portal — harmonized federal data on schools, school districts, and colleges — through a discovery-first set of tools that search and describe datasets, fetch raw records or aggregated statistics, decode coded values, and resolve institution names to IDs, with no API key required and read-only access to the live API.

Search Japanese onomatopoeia by scene, not by spelling. 161 entries with nuance explained in Japanese and English. Fully offline MCP server, no API key required.

Free, no-key MCP server for reading scripture from 35+ public-domain translations in 8 languages. Lets users fetch verses, chapters, and passages via natural language from any MCP client.

An educational MCP server example demonstrating how to build a server that integrates with LLM clients like Claude Desktop.

Provides AI-powered educational tools for teachers including lesson planning, quiz creation, student progress analysis, learning path recommendations, and rubric generation. Enables educators to automate administrative tasks and personalize learning experiences through natural language interactions.

Read-only MCP server providing Wealthi's AI Coach with scoped access to student progress data from Firestore and Supabase, enabling AI to retrieve student profiles, progress, assessment results, and learning signals without direct database credentials.

Rabbithole provides an infinite canvas for learning by allowing users to open documents, select text, ask questions, and receive answers that open as child documents, all running locally via an MCP server.

An MCP server for the FlashLearnAI public API that enables AI-powered flashcard deck generation, browsing sets, SM-2 spaced-repetition study sessions, and API usage tracking through natural language.

Helps independent inventors calculate USPTO fees, determine entity status, track patent deadlines, and understand procedural rules without needing an attorney.

Bilingual (EN/ES) AI-writing detection that shows the evidence instead of a percentage: named tells with line and column, hidden-character inspection, and citation cross-checking against a document's own bibliography. Seven of its nine tools run entirely locally and never touch the network.

Enables MCP clients to search and read the free AI School curriculum, including 550+ tracks on AI engineering, governance, security, and applied AI by profession.

MCP server over the open index of 1,562 certification exam blueprints across 217 certifying bodies. Search exams, pull full blueprints (domains & weights, passing scores, prerequisites, renewal), and compare certifications. Read-only, public data, no API key.

A minimal Model Context Protocol server built with the official Python SDK. It exposes one tool, define, which looks up the definition of an English word using the free dictionaryapi.dev API.

Enables students to access Moorle courses, assignments, grades, announcements, and notifications through authenticated MCP tools.

Enables AI agents to conjugate verbs in 14 European languages via a hosted Rust API, requiring only a free API key.

Enables querying of a locally pinned snapshot of the Education-to-Workforce Indicator Framework — 99 indicators and 11.8M observations — to browse questions, describe metrics, resolve places, and fetch or rank data across national, state, county, and district levels.

A language expression coach MCP server that provides native-sounding translations with cultural context, tone notes, and audio pronunciation for over 13 languages.

Enables Northwestern University AI students to sign in to their class OpenRouter workspace and generate, edit, and locally re-mask images through eight account, model, and image tools. Saved files, prompts, costs, and inline previews are kept local, with workspace-scoped credentials separated by cohort.

Enables MCP-compatible clients to access Digiforma's GraphQL API for managing trainees, training sessions, and executing arbitrary GraphQL queries or schema introspection.

An MCP server that gives desktop AI apps access to your Waterloo LEARN courses, enabling listing courses, getting announcements, content, grades, and upcoming events through natural language.

Korean Saju and Chinese BaZi (Four Pillars) computed by the CAFE engine: natal chart with Day Master and Ten Gods, Five Elements balance, chart structure (格局), yin-yang and climate, favorable-element candidates, and a manseryeok calendar with exact solar-term times. 6 read-only tools, no API key. Remote: https://mcp.24plus.ai.kr/mcp or npx -y @dangamsoft/cafe-mcp

13,000+ IT certification practice questions for AI agents (AWS, Azure, GCP, CompTIA, CISSP, PMP, Kubernetes, Terraform, Cisco, Salesforce). Pay-per-call via x402 USDC on Base, or a prepaid API key. Tools: get_cert_questions, list_certifications.

Gives Claude access to your Skool community, enabling reading and writing posts, comments, members, classroom content, and DMs using your own login.

An MCP server for Canvas LMS that provides 15 curated tools for everyday student work and a gateway to reach every endpoint your Canvas instance exposes.

Exposes USC's public course catalog API to AI agents, enabling natural-language queries about courses, GE requirements, schedules, and fees with optional filters for days, times, and open sections.

Enables AI agents to search and read the public Faradars course catalog, including prices, discounts, syllabi, reviews, instructors, categories, learning paths, offers, and magazine articles, without an API key or account.

Enables AI agents to access live aviation data including METAR weather, airport information, aircraft specs, an aviation glossary, and FAA-style practice questions via the free Rotate Pilot API.

Provides an MCP interface for accessing YOKATLAS (Turkish Higher Education Council Atlas) data, enabling LLM applications like Claude to search and retrieve details about undergraduate and associate degree programs in Turkey.

An MCP server that exposes certifications, projects, and an AI engineering learning roadmap as callable tools for MCP clients like Claude Desktop.

An unofficial MCP server for Cambridge's CamCORS system, enabling supervision report management through a Chrome browser.

Lets an AI agent read and manage a family's EduPage school data, including timetables, homework, grades, messages, absences, events, and canteen meals, and also send messages to teachers or order meals.

Enables AI agents to drive live Hack The Box labs through the real HTB Labs API — spawning, resetting and extending machines, submitting user and root flags with difficulty ratings, browsing challenges, and switching or downloading VPN configurations for the authenticated account. Every call hits the live API rather than cached content, with destructive actions annotated so hosts can gate them behind consent.

Enables MCP clients to search, read, create, preview, and edit Smartipedia encyclopedia articles with no API key or signup.

Enables local, offline analysis of essay drafts — word and page counts, readability scores, style flags like passive voice and filler words, and word-limit checks — with no account, API key, or network calls.

An MCP server for the University of Vienna's course catalogue (u:find), enabling natural language queries for courses, programmes, staff, and schedules. Read-only, no account or API key required.