Number puzzle API + MCP: solver-checked puzzles as JSON/SVG, daily puzzle. $5/mo; 50 free/day.
Streamable HTTP
https://sumbloom.cybermaxtools.com/mcp?via=mcp-registryclaude mcp add --transport http sumbloom https://sumbloom.cybermaxtools.com/mcp?via=mcp-registryThis server publishes no installable package.