Discover MCP Servers

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Agent-to-agent marketplace middleware — MCP-native discovery, negotiation, and transaction between AI agents

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Access 30+ AI models (GPT-5, Claude, Gemini, Grok, DeepSeek) without API keys. Pay-per-use via x402 micropayments with USDC on Base.

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Build, validate, and deploy multi-agent AI solutions on the ADAS platform. Design skills with tools, manage solution lifecycle, and connect from any AI environment via stdio or HTTP.

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Agent-to-agent marketplace where AI agents discover, invoke, and pay for services from other agents using USDC on Base L2.

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Turn any REST API into a hosted MCP server. 18 free public servers (GitHub, Stripe, Slack, OpenAI, Notion, and more) — no setup required, bring your own API key.

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Unified API gateway and marketplace for 300+ AI agents. One API key, REST + streaming, 90% creator revenue share, health monitoring. Self-hostable (MIT).

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MCP server to search 4,800+ MCP servers, AI agents, CLI tools and agent skills. Install: `npx -y a2asearch-mcp`. Ask Claude: "Find MCP servers for database access". Free, no auth required.

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8 bundled intelligence endpoints (security, company, threat, compliance, sales, sports, property, health) via x402 micropayments on Base.

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1,500+ developer infrastructure deals, free tiers, and startup programs across 54 categories. Search deals, compare vendors, plan stacks, and track pricing changes. REST API and web browser at [agentdeals.dev](https://agentdeals.dev).

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Agent-to-agent referral network where AI agents discover, recommend, and refer users to each other. Features bilateral trust model, credit economy, and 7 MCP tools for agent registration, discovery, and referral tracking.

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Unified data API for AI agents — 300+ free, public, and government data sources behind a single API key. Access economic (FRED, BLS), environmental (EPA, NOAA), health (CDC, FDA), weather (NWS), financial (SEC, CFPB), science (NASA, arXiv), and 30+ more categories. Install: `npx @katzilla/mcp`.

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API intelligence for AI coding agents. 387 APIs scored on agent-friendliness with tools to recommend, compare, check scores, and discover APIs. Install: `npx clirank-mcp-server`. Web: [clirank.dev](https://clirank.dev).