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.
Unified API for AI agents — 180+ tools across geocoding, weather (NWS), climate stations (NOAA), earthquakes (USGS), tides (NOAA), points of interest (OpenStreetMap), patents (USPTO ODP), US case law (CourtListener / Free Law Project), Federal Register, Wikipedia, scientific papers (arXiv / PubMed / Semantic Scholar), AI summarize / translate / extract / screenshot / image-describe, image compression, DNS / WHOIS, crypto address-validate + EVM gas oracle, OFAC sanctions screening, US Census ACS demographics, airport / ZIP lookup. Sub-cent to a few cents per call in USDC on Base via x402 — no API keys, no signup. npx -y @2sio/mcp
The graded MCP registry: live-probes every remote server in the official registry (initialize, tools/list, schema quality, latency, provenance) and publishes evidence-backed grades — searchable by agents via its own MCP endpoint at mcpqueen.com.
Quality signal
53/100 (Fair)
41/100 (Fair)
Install path
npx · high
npx · low
Engagement
4 0 0 7
0 0 0 0
Tools
180+ endpoints including geocoding, weather, legal, scientific, and AI toolsPay-per-call pricing with USDC on Base or Solana, no API keys or signupSDKs for TypeScript, Python, Go (pending), and Rust (pending)Free real calls per endpoint per hour for trial without wallet or keysWatchers for push-based event notifications with signed callbacksHosted MCP server or local CLI for private key security and signing
