Public API

REST API with authentication (API keys or OAuth) for reading and writing HoneyBill data: invoices, customers, projects, time entries, and payments. Enables custom integrations and connections to automation platforms like n8n, Zapier, and Make.

Key endpoints requested so far:

• Time tracking — create/update time entries (project, description, start/end or duration, billable rate), so external time or task tools can push logged work straight in.
• Invoice line items — add or update line items (description, quantity, rate) on a draft invoice programmatically.
• Invoices — create, read, and update invoices, including status changes.
• Projects and customers — list/read so an external tool can map its own projects/clients to the correct HoneyBill project and customer before pushing data in.
• Mark time entries as invoiced — so entries synced in and billed don't get double counted on a future sync.

Use cases raised: syncing tracked time and task-based work from project management tools (e.g. Dart AI) into HoneyBill invoices automatically.

Looking for AI agent integration specifically (Claude, Claude Code, etc.)? See the separate MCP Server request.