This address is an MCP server (streamable HTTP, no sign-in). Add https://staycostbrain.com/mcp as a connector:
in Claude, Settings → Connectors → Add custom connector; in ChatGPT, Settings → Apps & Connectors →
Advanced → Developer mode → Create.
Tools: get_capabilities, list_places, tourist_tax, place_rules, hotels_link. Every tourist-tax figure comes from the tax authority's own pages, with its source and the date it was checked. There are no room prices and no booking: hotels_link returns a link where the person sees live prices and books themselves.
The same answers as plain JSON, to open in a browser: