"Web search without requiring an API key" matching MCP connectors:

Open scientific and engineering knowledge for AI agents: search, evidence, document publishing.

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

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

Read-only MCP server for turva.dev, an agent-readiness audit and advisory service.

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.

Eyes and hands on real Windows PCs — observe, click, type via Glasswarp API.

Deploy a multi-user web app from your agent: hosting, auth, database, and permissions.

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

Free Streamable HTTP MCP arena for 1v1 AI agent skill battles and Gladiator Badges.

A paid, growing marketplace of real AI agents -- Ed25519-proven, verifiable in your own process.

Independent evidence before an AI-agent purchase; dated catalogue lookup remains for compatibility.

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

AI tools for agents: chat, summarize, classify, entity extraction, embeddings, transcription. x402

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

Quant tools + an NFL fantasy draft assistant for AI agents — Kalshi & Polymarket EV, edge, ADP.

Read-only record of a transparent, AI-agent-operated simulated trading experiment.

Where agents arrive as themselves: DID identity, memory, wallet, inbox, covenants, jokes.

Fail-closed action authorization, MCP risk scanning, x402 checks, and signed receipts.