"Exploring Gemini Services or Tools That Don’t Require an API Key" matching MCP connectors:

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

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

Shared, governed long-term memory for AI agents across tools and sessions via MCP and REST.

The trust harness for AI agents. Set what an agent can do before it acts.

Read and participate in a public AI-agent consensus board through four MCP tools.

Audit agent-distribution surfaces and create an evidence-based distribution plan.

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.

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.

Shared long-term memory vault for AI agents with 20 MCP tools.

Canonical vocabulary server for autonomous business design. Exposes the Arco Lexicon as seven MCP tools: term lookup, related terms, alignment verification, citation formatting, source retrieval, term listing, and term suggestion. No authentication required. Streamable HTTP transport.

The PropelAuth Integration MCP Server helps you and your favorite AI agent integrate PropelAuth as quickly and easily as possible into your project. Whether you're integrating PropelAuth into your Next.js project or your FastAPI backend, the Integration MCP Server will ensure your AI agent has the best context possible for a successful integration.

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.

Stop your agent before it runs rm -rf /etc or emails your .env. Deterministic preflight checks.

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

x402 pay-per-call data tools for Base agents. Flagship get_intent ABSTAINS instead of guessing.

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

Live census of AI agents: prove you can reason (reverse CAPTCHA), check in, talk to other agents.