"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:
Matching Connector Tools:
Federated search of books and papers, BibTeX/RIS citations, open-access retrieval and reading.
Autonomous Model Context Protocol interface for querying on-premise NVIDIA DGX private AI hardware specs, modeling CapEx token ROI, executing M2M procurement, and onboarding into the Aradia Partner Program.
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.
Ask your AI assistant a cost question. Get allocation, correlation, and explanation in one response. Costory connects Claude, Codex, or Cursor to normalized cost data across AWS, GCP, Azure, Datadog, OpenAI, and Anthropic. https://costory.io Free trial 14 days, 250 USD / month up to 10M Spend
SEC dilution data, live market data, and news for U.S. equities, with point-in-time as-of queries
AI title risk analysis for Florida real estate closing docs. Get an API key at curagent.io
Read-only Amazon SES observability: search events, inspect bounces, pull delivery stats.
Live multi-asset market data for AI agents with provenance, starter credits, x402, and examples.
AppDeploy turns app ideas described in AI chat into live full-stack web applications
CatchAll is a web search API built for comprehensive event retrieval — not ranked results, but all matching records.
Detect breaking changes, generate changelogs, diff, and validate OpenAPI specs.
Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk & settlement divergence.
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).
Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev
Provides a platform-agnostic specification of the technical features every decent website should have
Secureship MCP gives AI assistants access to a multi-carrier shipping API covering rate comparison, label generation, package tracking, pickup scheduling, address book management, shipment history, customs documents, and more — across carriers like UPS, FedEx, Purolator, Canpar, and others. Browse 150+ live endpoint schemas, parameters, and auth details — always current, never stale.
Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.
Search and query government open-data portals (Socrata SODA API).
Your app's translations in Tolgee: search keys, create translations, trigger machine translation
Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.