"MCP servers that don't require API keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Read-only MCP server for the OrchestKit docs: full-text search + Markdown fetch. No auth.
Ask questions about Claude Code, Cursor, Codex and MCP — get answers grounded in their official docs, with citations. A hybrid RAG service that AI agents call through two MCP tools (or over REST). It indexes ~600 pages of official documentation, refreshes itself daily, and every design choice is backed by an experiment.
CapaLens is a read-only software directory for people and AI assistants. Explore 234 software products and 347 MCP, API and CLI interface listings using seven discovery tools. Documentation review does not mean live vendor testing or security testing; no vendor integrations have been tested. CapaLens does not execute vendor actions or collect vendor credentials.
Free, read-only access to Alicia's published English and Chinese notes on Houdini, Three.js, OpenUSD and AI-assisted 3D workflows. Search articles, read full Markdown, browse topics and recent notes. Results include canonical source URLs and author attribution. No account or API key; Streamable HTTP with four read-only tools. Digital Garden is the interactive 3D flower artwork at digitalgarden.si. Setup: https://digitalgarden.si/agents/
Keyless multi-chain EVM JSON-RPC, indexed Data API, docs, CU pricing and status. API key optional.
Overleaf alternative online LaTeX editor. AI agents edit, comment, and chat. Keep or revert edits.
Grounded search over chinaready.co — practical guides for launching software in Mainland China (ICP filing, app-store publishing, China cloud regions, payments). Three read-only tools: hybrid search, topic catalog, and full articles as Markdown. Every result carries an absolute source URL so answers can be cited. Free, no account, no keys.
Public, dated project notes from the iinventedlight / corrow indie studio, covering the Starweave DAW, the Crystal Storm game, music and art. It's a remote streamable-HTTP MCP server at https://iinventedlight.com/mcp, with three read-only tools: list_notes, read_note and search_notes. There's also an optional submit_contribution tool that needs a key and only sends to a private review queue that a person approves. Agents should ask their user before submitting anything. Notes are CC BY 4.0.
Version-aware Mobiscroll UI component schemas and examples, plus Connect REST API and SDK knowledge.
Search and read Web3 security education articles and a 230-term glossary from Onchain Diary.
Lean operations knowledge base built on DBS: cited answers, tool cards, plans and diagnoses.
Find the best paid API for a task, package safety checks, stock catalysts, x402 market data.
Where apps write their log files on Windows, macOS and Linux, as exact copyable paths.
Official community MCP server for the Radix DLT network. Inspect on-ledger entities (accounts, components, packages, resources, validators), search and read curated developer docs, validate and preview Scrypto transaction manifests.
LinkedIn, Slack and GitHub profile photo specs, headshot style guides and a free headshot audit.
Read-only lookup over a dated, sourced reference site for large-scale tactical shooters: one tool that returns a page as markdown, by id or by question.
Read guide requirements, prepare confirmed maintenance guides and check your device-owned jobs.
Publish HTML reports to a share link, collect anchored comments, revise at the same URL.
JSONPad docs, API, SDK and CLI references, and offline checkers for write rules and flows.
Official Langfuse documentation for building LLM evaluation workflows: datasets, experiments, LLM-as-a-judge evaluators, custom scores, human annotation, and prompt/model comparison. Search documentation and retrieve current code examples, including tracing and SDK integrations. Remote Streamable HTTP server; no account, API key, or local installation required. Provides documentation guidance; accessing project data and running evaluations require separate setup.
