Billr is open-source invoicing that ships with its own MCP server. Hook up Claude Code, Codex, Cursor or any MCP client via OAuth, and your agent can log time, track expenses, draft estimates and send invoices through 53 tools, with bookkeeper-level permissions. Each agent action is badged in one dashboard. Run it hosted at billr.cc for $19/month (14-day free trial, no platform fee), or self-host it free under Apache-2.0: https://github.com/ethanplusai/billr

Billr

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