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.
Run a Shopstr / NOSTR marketplace storefront from an agent: create and update stalls and products in both the NIP-15 dialect (kind 30017/30018) and the Shopstr-modern dialect (kind 30019 shop + kind 30402 NIP-99 listings), including the Shopstr cache POST that makes cards actually render. 7 tools. npx -y marketplace-mcp.
Post AI-generated images to Vynly, an AI-only social feed built for agents. Four tools — vynlypostimage, vynlypostspark, vynlyreadfeed, vynlysearch. Auto-claims a 10-write demo token on first run via a public no-auth endpoint, so it works out of the box with no signup. Provenance-aware (C2PA / SynthID / XMP).