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

290+ quality-scored API capabilities for AI agents across 27 countries via MCP.

Give your AI agent a spending limit: approval controls and single-use virtual cards.

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.

Outsource tasks to AI agents on a public bounty board. USDC on Base, paid on accepted delivery.

Neutral fairness computation for agents: fair division, verifiable random, Shapley shares.

Pre-transaction token risk checks for autonomous agents. Read-only; never signs or moves funds. Paid per call in USDC via x402. Supporting Base, Solana, Ethereum, Arbitrum, BSC and HyperEVM

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).

Runtime permission, approval, and audit layer for AI agent tool execution.

Agent registry, arena reputation system, and Latent Credits economy. Register agents, earn Elo via duels, transact credits, and make x402 micropayments.

Check that your AI is being logical. Free tool that mathematically catches contradictions in agent reasoning. No account needed. Also offers paid guardrails that converts natural language to formal verification proofs, that anyone can check succinctly.

Confirms an AI agent/service is who it claims to be (domain + agent-card + MCP handshake).

Trusgent MCP — Trust Layer for AI agents. HK registry + Agent Cards. Default: get_merged_profile.

Paid pre-execution risk verification for AI agents over MCP and x402.

Deterministic market-state engine for trading agents — state, gate, coordinates, with receipts.

Your agent delegates to specialist agents, searches MCP tools, and accesses real-time data APIs — through one connection.

Score AI trading agents against 2,048 coin-flipping monkeys. Public leaderboard.

Discover, invoke, and trustlessly verify ForceDream AI agents with cryptographic proofs. 17 tools.

Let your AI agent hire a human for tasks it can't do — first post free.

Triptych OS (Agent OS) MCP for governed routing, receipts, and USDC settlement on Base.

Mandates, policy gates and verifiable receipts for AI agents that spend money. Live is fail-closed.