Read invoices, bills, contacts, ledger and bank balances; create drafts and contacts in Fiken. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Fiken connector, then ask in plain words. The AI picks the tools.
For Norwegian small businesses and bookkeepers who keep their accounts in Fiken.
List the issued invoices that are not settled and have a due date in the past. Ask the assistant to sort them by customer and amount, then open one for details.
List the purchases and supplier bills with their paid status. Ask which bills are still open, and open one purchase to see its lines and payments.
Read the bank account balances for today or a past date. Compare them with the closing balance of chosen ledger accounts.
Search the contacts by name or organization number. Then list the invoices of that customer to see what you sold and what is still unpaid.
Find the customer and the products. Create an invoice draft with the lines. The draft is not booked and not sent, so you can check it in Fiken first.
Changes dataCreate a contact marked as a customer. Add a product with a price and an income account, so both are ready for the next invoice.
Changes dataYou sign in with your Fiken account and approve the access (OAuth). You do not need an API key.
This server reads your companies, contacts, invoices, purchases, sales, products, ledger and bank balances. It can create contacts, products and invoice drafts, and, only when you ask, issue an invoice from a draft and send an invoice to a customer (both cannot be undone). It never deletes anything. The company needs Fiken's API module (99 kr per month, ordered in Fiken under Innstillinger). You can revoke access any time in Fiken: Rediger konto, Sikkerhet, Apper du har gitt tilgang til.
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": {
"fiken": {
"url": "https://fiken.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"fiken": {
"type": "http",
"url": "https://fiken.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: you sign in with your Fiken account. 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 user | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per user | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Fiken server only. Ask your AI to run fiken_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 fiken_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 fiken_upgrade before then undoes the cancel. Or write to [email protected].
fiken_get_userfiken_list_companiesfiken_get_companyfiken_list_accountsfiken_get_account_balancesfiken_list_bank_accountsfiken_get_bank_balancesfiken_list_contactsfiken_get_contactfiken_list_invoicesfiken_get_invoicefiken_list_invoice_draftsfiken_list_credit_notesfiken_list_offersfiken_list_order_confirmationsfiken_list_productsfiken_get_productfiken_list_salesfiken_get_salefiken_list_purchasesfiken_get_purchasefiken_list_journal_entriesfiken_list_transactionsfiken_list_projectsfiken_list_time_entriesfiken_list_inbox_documentsfiken_create_contactfiken_create_productfiken_create_invoice_draftfiken_issue_invoice_from_draftfiken_send_invoicefiken_usage_statusfiken_request_featurefiken_upgradefiken_cancel_subscriptionFind overdue customer invoices. Review unpaid supplier bills. Check bank and account balances on a date. Look up a customer and the sales history. Prepare an invoice draft for a customer. Add a new customer and a product. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Fiken. The server calls the Fiken API with your own Fiken 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.
A Fiken account. You sign in to Fiken and approve the access. You do not need an API key.
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: you sign in with your Fiken account. 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 Fiken 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. You can revoke the access in Fiken at any time.
Yes, if you approve it. 5 of the 31 Fiken tools can create or change data. The other 26 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
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 Fiken server only. Cancel any time: your paid plan then runs to the end of the paid period. Run fiken_usage_status to see how many calls you used.
Ask the AI to run fiken_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 fiken_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 fiken_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.