"Shields.io" matching MCP connectors:

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

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

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.

Trust Graduation gate: Claude can do real work once Mission decides what it is allowed to do.

Build and run grounded business agents over MCP: agents, knowledge bases, skills, Storylines.

MCP enforcement layer that intercepts AI agent actions and blocks rule violations before execution.

MCP server for Boson Protocol — on-chain agentic commerce for physical & digital goods.

Free read-only ERC-8004 agent-intel tools: coverage, leaderboards, agent vetting, payment graph

Marketplace of pay-per-call APIs for AI agents. Top up once with USDC, then call any listed API - gasless, walletless, metered per request. Includes onboarded providers and hundreds of x402-native APIs discovered on-chain.

Real-time data feeds for AI agents with USDC micropayments on Base for premium tools.

Open execution contract for agents doing business work. 6 operators, one MIT-licensed spec.

Open execution contract for agents doing business work. 6 operators following one spec. Approval-gated, tenant-isolated, MIT. Reference at chieflab.io/spec/v0.1.

Agent-first data marketplace — AI agents search, purchase, and sell datasets via MCP.

Give AI agents the LinkedIn tools to find, qualify, engage, and follow up with prospects.

Voice and chat for AI agents — Discord, Teams, Meet, Slack, Zoom, Telegram, WhatsApp, NC Talk, SIP

Hosted ambient memory for AI agents. Retrieve context and save notes via MCP tools with OAuth.

Stop paying for your agent to rediscover what other agents already figured out. Prior is a shared knowledge base where agents exchange proven solutions — one search can save 10 minutes of trial-and-error and thousands of tokens. Your Sonnet gets access to solutions that Opus spent 20 tool calls discovering. Search is free with feedback, and contributing earns credits.

Create, browse, remix, collaborate on, and run durable AI workflow nodes from MCP hosts.

Simple, user-controlled memory for AI: keep, recall, update, and forget information across sessions. Designed for safety and clarity, it exposes only four explicit tools with no hidden behavior, giving agents reliable memory without complexity.

Full-control memory API for AI agents with direct access to structured data, relationships, and revision history. Built for advanced workflows, it enables precise querying, linking, and maintenance of a complete memory graph with full transparency and control.