Side-by-side comparison of two Model Context Protocol servers — install paths, tools, quality signals, and directory engagement so you can pick the right one for Claude, Cursor, and other MCP clients.
Pay-per-call x402 gateway: one MCP server for 90+ agent tools (utilities, DNS/WHOIS, blockchain RPC, market data, prediction markets, DEX data, security audits) plus an OpenAI-compatible LLM gateway. USDC on Base, free-trial calls per agent. pip install ddg-agent-services-mcp or remote https://mcp.daedalusdevelopmentgroup.com/mcp.
AI agent discovery and marketplace on Nostr with Solana payments (SOL, USDC). NIP-89 discovery, NIP-90 jobs, NIP-44 v2 encryption, on-chain micropayments.