MCP servers · accounting
Wave MCP server
Free accounting — invoicing, payments, expenses via GraphQL. Hosted by 0n3: 1 endpoint your AI can call with your own Wave account, from Claude, ChatGPT, Cursor, Claude Code, Codex or Gemini CLI. One sign-in, one key per AI, a receipt for every call.
1 endpoints3 categoriesauth: oauthhosted
What your AI can do with Wave
Invoices · Manage invoices0
Manage invoices
Customers · Manage customers0
Manage customers
More · Everything else this app exposes.1
Graphql
POST /Install in three steps
- Create a free account at 0n3.app and connect Wave: paste a key or sign in through a door. It lands in your vault, encrypted.
- Open 0n3.app/install, pick your AI. A key is made for that AI alone; copy the line it gives you.
- Ask your AI: whoami. It answers with your connected services. Then ask it to list customers in Wave.
Install (user scope — every project)
claude mcp add --transport http --scope user 0n3 https://0n3.app/mcp --header "Authorization: Bearer <your 0n token>"
Connect Wave to
Claude Code + WaveMCP server + skillClaude (desktop & claude.ai) + WaveconnectorChatGPT + Waveconnector · GPT actionCodex CLI + WaveMCP serverGemini CLI + WaveMCP serverCursor + WaveMCP serverVS Code (Copilot) + WaveMCP serverWindsurf + WaveMCP server
More accounting MCP servers
Questions
What can an AI do with the Wave MCP server?
1 things: invoices, customers, more. Every call runs with your own Wave connection and lands on a receipt.
Do I need to run anything on my computer?
No. 0n3 is hosted. Connect Wave once, install 0n3 into your AI with one line, done.
Where does my Wave key go?
Into your 0n3 vault, encrypted, one record per connection. The AI never sees it.