Merit Aktiva MCP server

Read Merit Aktiva invoices, customers, vendors, items, payments and reports; create a customer. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.

Connect Merit Aktiva50 free tool calls a month

What can I ask?

Turn on the Merit Aktiva connector, then ask in plain words. The AI picks the tools.

Which customers still owe us money, and how much does each owe?
Show the sales invoices we issued in September this year.
What was our profit and loss for the last financial quarter?
Which vendor bills from last month have not been paid yet?

What you can do with Merit Aktiva in Claude and ChatGPT

For small business owners and accountants who keep their books in Merit Aktiva.

Find which customers still owe money

The AI reads open customer receivables with date, due date, total, paid and unpaid amount per document, and can keep only documents overdue by a number of days.

List the sales invoices of a period

The AI lists sales invoices for a period of up to 3 months, finds them by number or customer, and reads one in full with its lines and VAT.

Check vendor bills and whether they are paid

The AI lists purchase invoices for a period with vendor, totals and paid flag, reads one bill, and searches vendors.

Read the profit and loss and the balance sheet

The AI reads the income statement and balance sheet with balances per month, and sums up the main changes.

Review payments and bank account movements

The AI lists customer and vendor payments of a period and the income or expense payments booked on a bank account, with the documents they paid.

Look up a customer or add a new one

The AI searches customers by name, registry number or VAT number and creates a new customer. It never overwrites an existing customer.

Changes data

How do I connect Merit Aktiva?

Before you connect

The login page asks for your API ID, API key and Country.

An admin creates the pair in Merit Aktiva under Settings → API Settings. The API needs the Pro or Premium licence. Pick the country your company is hosted in. Requests are signed with your key (HMAC-SHA256), so the key itself is never sent to Merit; it is stored only to sign your requests and is never shown to anyone.

Claude claude.ai · Desktop

Open Customize → Connectors, then click + Add → Add custom connector.
Enter the name Merit Aktiva and this URL, then click Add:
https://merit-aktiva.usefulapi.io/mcp
Claude opens the login page: enter your API ID, API key and Country.
In a chat, click + → Connectors and turn on Merit Aktiva.

Team and Enterprise: an Owner adds the connector for the organization first.

ChatGPT chatgpt.com

Open Plugins, click +, then Add custom MCP server.
Enter the name Merit Aktiva and this URL, choose OAuth as the authentication, confirm the warning and create it:
https://merit-aktiva.usefulapi.io/mcp
ChatGPT opens the login page: enter your API ID, API key and Country.
In Plugins, install Merit Aktiva, then choose it in a chat.

No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.

Claude Code

Run this command, then run /mcp in Claude Code to log in:

claude mcp add --transport http merit-aktiva https://merit-aktiva.usefulapi.io/mcp

Cursor

Add to Cursor or add this to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "merit-aktiva": {
      "url": "https://merit-aktiva.usefulapi.io/mcp"
    }
  }
}

VS Code

Add to VS Code or add this to .vscode/mcp.json:

{
  "servers": {
    "merit-aktiva": {
      "type": "http",
      "url": "https://merit-aktiva.usefulapi.io/mcp"
    }
  }
}

Codex

Run these commands. The second one opens the login page:

codex mcp add merit-aktiva --url https://merit-aktiva.usefulapi.io/mcp

codex mcp login merit-aktiva

Other clients

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.

https://merit-aktiva.usefulapi.io/mcp

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 API ID, API key and Country. 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.

Pricing

Plan	Price	Limit
Free	$0	50 tool calls / month
Proper company	$9/mo · $90/yr	10,000 tool calls / month
Pro+per company	$39/mo · $390/yr	100,000 tool calls / month

Each paid plan covers this Merit Aktiva server only. Ask your AI to run merit_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 merit_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 merit_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

Tools 30

Show all 30 tools (the AI picks them for you)

Read only · 25

List sales invoicesmerit_list_sales_invoices
List sales invoices (header level: number, customer, dates, totals, paid flag) of a period. The period may span at most 3 months (Merit limit); for longer spans make several calls. Use merit_get_sales_invoice for the lines.
Find sales invoices by number or customermerit_search_sales_invoices
Find sales invoices by invoice number, customer name or customer id (give at least one).
Get a sales invoicemerit_get_sales_invoice
One sales invoice in full: header, lines (items, quantities, VAT, accounts), payments and dimension allocations. The PDF attachment is never requested.
List purchase invoicesmerit_list_purchase_invoices
List purchase invoices (vendor bills) of a period: bill number, vendor, dates, totals, paid flag. The period may span at most 3 months (Merit limit); for longer spans make several calls.
Get a purchase invoicemerit_get_purchase_invoice
One purchase invoice in full: header, lines, payments. The attachment is never requested.
Search customersmerit_list_customers
Search customers by name (partial match), registry number or VAT number (exact), id, or changed since a date. At least one filter is required: Merit cannot return the whole customer list in one reply.
Search vendorsmerit_list_vendors
Search vendors (suppliers) by name (partial match), registry number or VAT number (exact), id, or changed since a date. At least one filter is required: Merit cannot return the whole vendor list in one reply.
List items (articles)merit_list_items
List items, services and stock articles with price, unit, VAT and accounts. Optional filters: code or description (partial), type, id. With location_code the reply adds stock quantity and cost of that warehouse.
List the chart of accountsmerit_list_accounts
The general ledger chart of accounts (code, names, VAT, parent flag, active flag).
List VAT ratesmerit_list_taxes
All VAT rates of the company (TaxId, code, name, percent, active flag). The TaxId is what invoice rows refer to.
List departmentsmerit_list_departments
Departments (code, name, active flag).
List bank accountsmerit_list_banks
The company's bank and cash accounts (BankId, name, IBAN, currency, ledger account). BankId feeds the payment tools.
List financial yearsmerit_list_financial_years
Accounting periods (financial years) with start, end and active flag.
List dimensionsmerit_list_dimensions
Accounting dimensions and their values (DimId, name, value code, expiry). all_values = true also lists expired values.
List payment typesmerit_list_payment_types
Payment methods and sources (cash, banks, reporting entities, ledger accounts) usable for purchases, expense reports or sales.
List paymentsmerit_list_payments
List payments (customer and vendor receipts and payouts) of a period, with the documents they paid. The period may span at most 3 months (Merit limit); for longer spans make several calls.
List income or expense payments of a bank accountmerit_list_bank_payments
List the income payments (money received) or expense payments (money paid out) booked on one bank account for a document-date period, with the documents each paid. The period may span at most 3 months (Merit limit); for longer spans make several calls.
List general ledger transactionsmerit_list_gl_batches
List general ledger batches (journal entries, also those created from invoices and payments) of a period: batch code, number, date, total. The period may span at most 3 months (Merit limit); for longer spans make several calls.
Get a general ledger transactionmerit_get_gl_batch
One general ledger batch with all its debit and credit lines (account, memo, department, tax, amounts). The attachment is never requested.
Customer debts reportmerit_customer_debts_report
Open customer receivables: for each unpaid document the customer, date, due date, total, paid and unpaid amount. Give a customer name (empty string = all customers) or a customer id; over_due_days keeps only documents overdue by at least that many days.
Customer payments reportmerit_customer_payments_report
Customer invoices with their unpaid amount and overdue flag for a period, for one customer (name or id). Only the FIRST page is returned: if has_more is true, narrow the period or the customer (the continuation endpoint is not supported).
Income statement (profit and loss)merit_income_statement
The profit and loss report: one row per report line, with balances for per_count months counting back from end_date (newest first). Optional department filter.
Balance sheetmerit_balance_sheet
The balance sheet: one row per report line (assets, liabilities, equity) with balances for per_count months counting back from end_date.
Sales reportmerit_sales_report
Sales totals for a period, grouped by invoice, customer, item or country.
Purchase reportmerit_purchase_report
Purchase totals for a period, grouped by invoice, vendor, item or fixed asset.

Changes data · 1

Create a customermerit_create_customer
WRITE: creates ONE new customer record in the Merit company (name must be unique; an existing customer is never overwritten, Merit answers with an error). Nothing is invoiced, sent or paid. In Estonia not_td_customer must be true for private persons and foreign companies; city is required in Estonia for a non-EE country. Returns the new customer id.

Your usefulapi plan · 4

Usage status (free-tier meter)merit_usage_status
Report the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter.
Request a missing featuremerit_request_feature
Tell usefulapi that the user needs something the Merit Aktiva tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter.
Upgrade to Pro or Pro+merit_upgrade
Get a paid plan for Merit Aktiva (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter.
Cancel the Pro subscriptionmerit_cancel_subscription
Cancel the caller's Merit Aktiva Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run merit_upgrade later to undo the cancel before the period ends. Does not count against the meter.

FAQ

What can I do with Merit Aktiva in Claude or ChatGPT?

Find which customers still owe money. List the sales invoices of a period. Check vendor bills and whether they are paid. Read the profit and loss and the balance sheet. Review payments and bank account movements. Look up a customer or add a new one. See what you can do for the details.

Is this an official Merit Aktiva product?

No. usefulapi is an independent service. It is not affiliated with or endorsed by Merit Aktiva. The server calls the Merit Aktiva API with your own Merit Aktiva access, so it sees only the data that your account can see.

Can I connect Merit Aktiva to Claude or ChatGPT?

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.

What do I need to connect?

The login page asks for your API ID, API key and Country. See Before you connect for where to find them.

Do I put my Merit Aktiva key or an Authorization header in the client config?

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 API ID, API key and Country. 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.

How do you keep my Merit Aktiva credentials?

The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Merit Aktiva 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 Merit Aktiva.

Can the AI change my Merit Aktiva data?

Yes, if you approve it. 1 of the 26 Merit Aktiva tools can create or change data. The other 25 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.

What does it cost?

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 Merit Aktiva server only. Cancel any time: your paid plan then runs to the end of the paid period. Run merit_usage_status to see how many calls you used.

How do I subscribe or cancel?

Ask the AI to run merit_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 merit_cancel_subscription. Your paid plan continues to the end of the paid period.

What if a Merit Aktiva tool that I need is missing?

Tell the AI what you wanted to do. It can send the request with merit_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.

Which AI clients can I use?

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.

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