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

Read-only MCP server for the OrchestKit docs: full-text search + Markdown fetch. No auth.

Savvly MCP: query fund data, model projections, and compare against alternative retirement products.

DXF and PDF/X-4 for AI agents: structured facts, PNG renders, an interactive in-chat viewer.

Cães e gatos para adoção no Brasil, de ONGs e protetores. Busque por cidade, porte, idade e saúde.

Helena Bioinformatics MCP for clinical variant interpretation, ACMG/AMP evidence and literature.

Create amazing video experiences with the Qencode API, straight from your AI assistant.

AIOProductOS: revenue, feedback, work and analytics on one customer record. 71 tools, 3 apps.

Reassign: a circular 24-hour calendar and time-tracking copilot with ADHD-friendly scheduling.

Agent-first onboarding to Smarter Weather: plans, docs, signup, API keys, MCP config, billing.

The Apiosk MCP lets AI agents discover, pay for, execute, and publish APIs through the Apiosk gateway. It is a machine endpoint, not a website, so connect it from an MCP client (Claude, Cursor, ChatGPT, and others) rather than browsing it here.

Product search and price comparison for AI agents. Search 100M+ products across thousands of retailers by text or image, compare live offers and prices, and turn any merchant URL into structured product data. No API key required to start; add one for unlimited use and affiliate commission.

Crypto market intelligence: social sentiment, on-chain, trending narratives & analyst insights.

Search real-world UI & UX design references for mobile apps, web apps, and websites with Mobbin.

Score any URL against a real design contract — 40 checks, A-F grade, token + motion validation.

An agent-friendly API for product changelogs. A unified registry via CLI, API, or MCP.

Generate and edit images, videos, and audio with 150+ models from 20+ vendors.

What a stock price is betting on: implied growth, duration, and margin, read from SEC filings.

Scan any URL for AI agent readability — Vercel Spec, llmstxt.org, and agent-protocol manifests.

Read-only fantasy analysis for ESPN, Yahoo, and Sleeper leagues via MCP

Research a person's public footprint from a name, phone, email, or username. Sourced.