Read Yuki administrations, open invoices, ledger balances, contacts and documents. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Yuki connector, then ask in plain words. The AI picks the tools.
For accountants and businesses that keep their books in Yuki and want quick answers from their administration.
The AI lists unpaid sales invoices with amounts and due dates, within a date range if you like, and finds the contact behind each one.
The AI lists the purchase invoices you still have to pay, with amounts, references and due dates, so you can plan payments.
The AI reads the chart of accounts, the balance of every ledger account on a date, and the transactions booked on one account.
The AI gives the net revenue of an administration in a date range, and lists the administrations a key reaches, which suits accountants.
The AI searches the document archive for invoices, receipts and statements, shows the details and gives a short-lived download link.
The login page asks for your Yuki web service access key.
In Yuki open Settings → Integrations → Web services and choose Add new API key (needs the Management or Backoffice role; the key can be limited to one administration). Copy the key. It is used only to read your Yuki data on your behalf; revoke it in Yuki at any time.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"yuki": {
"url": "https://yuki.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"yuki": {
"type": "http",
"url": "https://yuki.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Yuki web service access key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper account | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per account | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Yuki server only. Ask your AI to run yuki_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with yuki_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with yuki_upgrade before then undoes the cancel. Or write to [email protected].
yuki_list_domainsyuki_list_administrationsyuki_list_outstanding_debtor_itemsyuki_list_outstanding_creditor_itemsyuki_get_gl_account_balanceyuki_list_gl_account_transactionsyuki_get_net_revenueyuki_get_gl_account_schemeyuki_list_projectsyuki_search_contactsyuki_list_document_foldersyuki_list_document_folder_tabsyuki_list_documentsyuki_search_documentsyuki_get_documentyuki_get_document_download_urlyuki_usage_statusyuki_request_featureyuki_upgradeyuki_cancel_subscriptionChase open sales invoices. Review open purchase invoices. Check ledger balances. Report net revenue. Find archived documents. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Yuki. The server calls the Yuki API with your own Yuki access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Yuki web service access key. See Before you connect for where to find it.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Yuki web service access key. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Yuki API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Yuki.
All 16 Yuki tools are marked read-only.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Yuki server only. Cancel any time: your paid plan then runs to the end of the paid period. Run yuki_usage_status to see how many calls you used.
Ask the AI to run yuki_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run yuki_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with yuki_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.