Share expenses from any AI assistant
Your AI can help you split a bill — but it can't show your friends what they owe. YAAT gives you a shared expense ledger that anyone in your group can open with a link, and your AI can read and write to it directly.
MCP endpoint
- URL
- https://yaat.me/api/mcp
- Transport
- Streamable HTTP
- Auth
- OAuth 2.1 (Claude Desktop, ChatGPT) or Bearer token (Cursor, Claude Code)
- Action catalog
- https://yaat.me/api/actions (public, no auth required)
- Discovery
- OAuth protected resource metadata
- Rate limit
- 60 requests/minute per token
- Price
- Free — all tools included with a YAAT account
How it works
- You talk to your AI — "Add $45 for groceries, split evenly between everyone"
- Your AI updates the ledger — It creates the expense, calculates each share, and saves it to your group.
- Everyone sees it instantly — Anyone with the group link can view balances and expenses — no AI or app needed on their end.
Supported clients
- Cursor — Settings → MCP → Add new global MCP server
- Claude Code — claude mcp add --transport http yaat https://yaat.me/api/mcp -H "Authorization: Bearer YOUR_TOKEN"
- Claude Desktop — OAuth: add https://yaat.me/api/mcp as a remote MCP server and sign in when prompted
- ChatGPT — OAuth: add https://yaat.me/api/mcp as a remote MCP server and sign in when prompted
Tool categories
- Group — create, update, delete, archive, change currency
- Member — add, rename, deactivate, remove
- Expense — add (single/bulk), update, update items, delete
- Settlement — add (single/bulk), update, delete, get suggestions
- Query — get balances, group summary, list groups/expenses, get expense detail
- Note — add note
Full tool schemas available at https://yaat.me/api/actions
Common questions
- What is MCP?
- Model Context Protocol is an open standard that lets AI assistants connect to external tools — like a plugin system for AI.
- Do my friends need to use AI?
- No. Only the person keeping the tab needs an AI assistant connected. Everyone else just opens the group link in a browser.
- Is it free?
- Yes. All MCP tools are free with a YAAT account. No premium-only actions.