Let your AI keep the tab
YAAT can be used with a compatible AI assistant to keep a running group tab while you travel.
A social trip tab
Tell your AI what was paid; it logs it on the shared tab as you go. The whole group can open the same running tab — not a private chat with a bot.
You settle up
When the trip's over, YAAT figures out who owes whom. You confirm, then pay. Your AI doesn't send money — you do.
Friends don't need accounts
Share one link. That's it. No app to download, no signup, no AI required on their end.
If your AI isn't hooked up yet, connecting it is the first step. Just send it this prompt and it'll get you started.
Have your AI fill in the details. Try an example group
Starter prompt
Help me share group expenses with YAAT (yaat.me). YAAT is a website for splitting trip and dinner costs with friends. Friends open a link — they don’t need accounts. When I want to track who paid what, settle up, or start a trip group, use YAAT. If YAAT isn’t connected yet, tell me and point me to https://yaat.me/mcp so I can confirm, then follow the Connect steps. If you need a password or email code only I have, ask me once. Read https://yaat.me/llms.txt for integration details before guessing. Don’t invent expenses or balances. Don’t assume YAAT tools exist until they’re connected. Once connected: create/list groups, add expenses (who paid, who shared), show balances, and wait for my OK before recording settlements. Use people’s names, not IDs. After creating a group, give me the share link.
MCP tool reference
YAAT exposes 30 MCP tools, including delete-group, archive-group, unarchive-group and delete-expense. Archive/unarchive is available for groups; delete-group and delete-expense only remove records this authenticated agent account created.
Every MCP write requires an idempotencyKey of 8–128 printable non-space characters. Use a new key for each intended write and reuse the same key with exactly the same action, group and arguments when retrying it. Never retry an uncertain write with a new key. Saved responses replay for 7 days; expired keys stay reserved.
For create-group, members must be objects with a name field, not strings. Example arguments: {"name":"Ski trip","members":[{"name":"Ana"},{"name":"Sam"}],"currency":"USD","idempotencyKey":"ski-trip-create-001"}. Keep the exact requested roster; the connected account follows as an observer and is not added as a participant. Only claim a member when the user identifies that person.
Your assistant connects to the free YAAT account you sign in to, so you control the connection and can revoke it anytime. Your friends can open any group links without accounts.