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

Neutral, verification-gated MCP directory of Japan construction contractors (KIRA-audited).

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.

Evidence-gated task verification for AI agents. Decompose goals into acceptance criteria, attach proof (screenshot, curl, file), independent LLM judge accepts or rejects. 24 tools. Hosted remote MCP (streamable-http, OAuth 2.1 + DCR).

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

Live operational + integration registry for Bittensor subnets: APIs, schemas, health.

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

Search real parts with datasheet-provenance specs, check compatibility and compose priced BOMs.

Search 438 game outsourcing studios by service, country, engine and platform. No API key.

Compliance infrastructure API connecting AI agents to Norwegian government systems (Altinn, BRREG).

NIST 800-171 controls and 800-171A objectives, crosswalks, exact SPRS scoring, POA&M generation.

Read-only U.S. lab-test catalog, collection-site search, and reference-range context.

2,029 DISA STIG rules with official check/fix text, CCI mappings, and .ckl checklist export.

40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP.

Access SEC filings, insider transactions, and financial data via the ShareSEER API.

Read-only macro risk analysis, evidence, signals, and source-backed research from l0g.fr.

Find MCP servers and check whether they actually respond, via live handshake probes.

Breach intelligence API: email search, domain monitoring, passwords and stealer logs.

Twitter/X, Instagram, Reddit & TikTok data for AI agents. Billions of posts. No API keys.

Read-only MCP: search & read a Traditional Chinese (zh-TW) Taiwan community forum (PTT-style).

Ski apartment search with one- or two-week prices, availability, destinations and ski passes.