Invoice Simple small business invoicing MCP server: create invoice, send invoice, create estimate.
Streamable HTTP
https://cotlet.dev/mcp/v1/invoice-simple/connectclaude mcp add --transport http invoice-simple https://cotlet.dev/mcp/v1/invoice-simple/connectStreamable HTTP
https://cotlet.dev/mcp/v1/invoice-simpleclaude mcp add --transport http invoice-simple https://cotlet.dev/mcp/v1/invoice-simpleThis server publishes no installable package.