E Financials

Open-source MCP server for e-arveldaja (the online accounting software of RIK, the Estonian Centre of Registers and Information Systems), known in English as e-Financials. It wraps the RIK e-Financials REST API and exposes accounting operations (bank transactions, clients, invoices, chart of accounts, journals, products, reports) as Model Context Protocol tools, so AI assistants (Claude, ChatGPT, Cursor, etc.) can work with your company's e-arveldaja data.

Hosted: werkzeug.ee

No install needed. Sign up at werkzeug.ee, get your personal MCP endpoint (https://werkzeug.ee/mcp/c/<id>) and paste it into Claude, ChatGPT or Cursor as a remote MCP server. Client-by-client steps: werkzeug.ee/docs.

Prefer to run it yourself over stdio? See Quick start below.

Tools at a glance

100 tools. Click a group to expand it.

Bank transactions (12)

Tool	Description
list_transactions	List bank transactions with optional filters.
get_transaction	Get a bank transaction by ID.
get_unprocessed_transactions	Get all unprocessed (PROJECT status) transactions that don't have a client assigned yet.
update_transaction	Update a PROJECT draft: clients_id, accounts_id, description, and optional type (C = money in, D = money out). type is translated to RIK's opposite letter,…
create_transaction	Create a bank transaction draft (PROJECT). type C is money in and type D is money out.
pay_purchase_invoice	Mark a CONFIRMED purchase invoice paid from a cash or bank dimension (for example account 1360, Arveldused aruandvate isikutega).
delete_transaction	Delete a transaction.
register_transaction	Register (confirm/post) a bank transaction with distribution rows.
invalidate_transaction	Invalidate a registered transaction (reverse registration per API rules).
get_transaction_file	Get the user-uploaded file attached to a bank transaction (OpenAPI ApiFile: name + base64 contents).
upload_transaction_file	Upload a file to a bank transaction (PUT .../document_user).
delete_transaction_file	Delete the user-uploaded file from a bank transaction.

Clients (9)

Tool	Description
list_clients	List all clients (buyers and suppliers).
list_suppliers	List all suppliers (vendors you pay).
get_client	Get details of a specific client by ID
search_clients	Search for clients by name.
create_client	Create a new client (buyer or supplier).
update_client	PATCH an existing client.
delete_client	Permanently delete a client by ID.
deactivate_client	Deactivate a client (soft-disable).
reactivate_client	Reactivate a previously deactivated client.

Invoices (26)

Tool	Description
list_sales_invoices	List sales invoices (invoices you send to customers) with optional filters.
list_purchase_invoices	List purchase invoices (invoices from suppliers you need to pay) with optional filters.
list_unpaid_invoices	List all unpaid invoices (both sales and purchase).
get_sales_invoice	Get details of a specific sales invoice by ID.
get_purchase_invoice	Get details of a specific purchase invoice by ID
create_sales_invoice	Create a new sales invoice draft.
validate_invoice_data	Read-only pre-booking checks for invoice totals, line nets/VAT, calendar dates, Estonian standard VAT rate vs invoice date, and foreign-currency rate…
create_purchase_invoice	Create a purchase invoice draft (PROJECT), apply VAT defaults, then repair invoice-level vat_price/gross_price from line items (create-then-repair).
update_sales_invoice	Update a sales invoice draft.
delete_sales_invoice	Delete a sales invoice.
register_sales_invoice	Register (post to the books) a sales invoice.
invalidate_sales_invoice	Invalidate a registered sales invoice (reverse registration per API rules).
get_sales_invoice_xml	Get the system-generated e-invoice XML for a sales invoice (OpenAPI ApiFile: name + base64 contents).
get_sales_invoice_pdf_system	Get the system-generated PDF for a sales invoice (OpenAPI ApiFile: name + base64 contents).
get_sales_invoice_user_file	Get the user-uploaded file attached to a sales invoice (OpenAPI ApiFile: name + base64 contents).
upload_sales_invoice_user_file	Upload a file to a sales invoice (PUT .../document_user).
delete_sales_invoice_user_file	Delete the user-uploaded file from a sales invoice.
get_sales_invoice_delivery_options	Get delivery options for a sales invoice (e-invoice vs email, suggested addresses, reasons).
deliver_sales_invoice	Send a sales invoice to the customer (PATCH .../deliver): e-invoice and/or email with optional subject and body.
update_purchase_invoice	Update a purchase invoice draft (PROJECT).
delete_purchase_invoice	Delete a purchase invoice.
register_purchase_invoice	Register (post to the books) a purchase invoice.
invalidate_purchase_invoice	Invalidate a registered purchase invoice (reverse registration per API rules).
get_purchase_invoice_user_file	Get the user-uploaded file attached to a purchase invoice (OpenAPI ApiFile: name + base64 contents).
delete_purchase_invoice_user_file	Delete the user-uploaded file from a purchase invoice.
upload_purchase_invoice_file	Upload a PDF or other file attachment to a purchase invoice.

Invoice settings (7)

Tool	Description
get_invoice_info	Get company invoice settings (address, templates, email templates for invoices and balance letters).
update_invoice_info	PATCH company invoice settings.
list_invoice_series	List all invoice series for the company (number prefix, terms, default flag).
get_invoice_series	Get one invoice series by ID (OpenAPI InvoiceSeries).
create_invoice_series	Create an invoice series.
update_invoice_series	PATCH an invoice series.
delete_invoice_series	Delete an invoice series by ID.

Journals (10)

Tool	Description
list_journals	List journal entries with optional pagination and filters (modified_since, effective date range, operation_type).
get_journal	Get one journal entry by ID (includes postings).
create_journal	Create a journal entry (POST).
update_journal	PATCH an existing journal entry.
delete_journal	Delete a journal entry by ID.
register_journal	Register (confirm/post) a journal entry.
invalidate_journal	Invalidate a journal entry (reverse registration state per API rules).
get_journal_file	Get the user-uploaded file attached to a journal entry (OpenAPI ApiFile: name + base64 contents).
upload_journal_file	Upload a file to a journal entry (PUT .../document_user).
delete_journal_file	Delete the user-uploaded file from a journal entry.

Products (7)

Tool	Description
list_products	List products/services for the company with optional pagination and modified_since filter.
get_product	Get one product/service by ID.
create_product	Create a product/service.
update_product	PATCH an existing product/service.
delete_product	Delete a product/service by ID.
deactivate_product	Deactivate a product/service.
reactivate_product	Reactivate a previously deactivated product/service.

Accounts (11)

Tool	Description
list_accounts	List the chart of accounts.
get_bank_accounts	List all bank accounts configured in e-Financials.
create_bank_account	Create a bank account in e-Financials.
get_bank_account	Get one bank account by ID.
update_bank_account	PATCH an existing bank account.
delete_bank_account	Delete a bank account by ID.
get_vat_info	Get company VAT information (VAT number and tax reference number).
list_projects	List all projects (cost/profit centers).
search_accounts	Search for an account by name or ID.
list_account_dimensions	List account dimensions (sub-accounts).
list_purchase_articles	List purchase articles (expense categories).

Reference data (3)

Tool	Description
list_currencies	List active currencies configured for the company (codes and Estonian/English names).
list_sale_articles	List sale articles (revenue / sales categories linked to accounts and VAT) for the company.
list_templates	List sale invoice templates available for the company.

Reports (3)

Tool	Description
reconciliation_report	Generate a reconciliation report comparing bank transactions with invoices.
match_transaction_to_supplier	Analyze a transaction description and suggest matching suppliers from the client list.
financial_summary	Get a summary of financial data including transaction counts, invoice totals, and outstanding amounts.

Financial statements (8)

Tool	Description
compute_trial_balance	Compute a trial balance (käibeandmik) from registered journal postings.
compute_balance_sheet	Compute a balance sheet (bilanss) as of date_to from registered journal postings (cumulative, including the opening-balance journal; do not add opening…
compute_profit_and_loss	Compute a profit and loss statement (kasumiaruanne) from registered journal postings for date_from/date_to, excluding year-end closing by default.
compute_receivables_aging	Compute receivables aging from unpaid confirmed sale invoices.
compute_payables_aging	Compute payables aging from unpaid confirmed purchase invoices.
compute_account_balance	Compute the balance of one chart account from registered journal postings (EUR base_amount when present).
compute_client_debt	Compute a client's net position from registered journal postings tagged with clients_id.
month_end_close_checklist	Surfaces everything blocking a month-end close for a YYYY-MM month.

Bank reconciliation and import (4)

Tool	Description
analyze_unconfirmed_transactions	Read-only diagnostic for PROJECT bank transactions: suggest duplicates, inter-account transfers, invoice matches, small bank fees, or manual review.
reconcile_bank_transactions	Mode-based bank reconciliation. mode=match (default): score PROJECT txs against open invoices. mode=auto_confirm: dry-run by default; with execute=true…
classify_bank_transactions	Classify unmatched PROJECT bank transactions by counterparty (bank fees, SaaS, card purchases, tax, owner transfers, salary, revenue, unknown).
process_camt053	Import an ISO 20022 CAMT.053 bank statement (LHV, Swedbank, SEB, Coop, Luminor).

Details, required arguments and caveats per tool: MCP tools reference.

Quick start

git clone https://github.com/werkstatt-jasper/e-financials-mcp.git
cd e-financials-mcp
cp .env.example .env
# Fill in your RIK API credentials in .env
npm install
npm run build
npm start

Prerequisites

• Node.js 20+ (see package.json engines; native fetch; Vitest 4 / CI require Node 20+).
• An e-Financials API key for your company.

API keys

A board member (or authorized user) can create keys in e-Financials:

Settings > General settings > e-Financials API access permits

Each key requires a name, allowed IP addresses, and at least one permitted function.

Environment variables

Copy .env.example to .env and fill in your credentials. The server loads .env automatically via dotenv/config at startup. Never commit .env (it is gitignored).

Variable	Required	Description
RIK_API_KEY_ID	Yes	API key identifier (used in the HMAC signing string).
RIK_API_KEY_PASSWORD	Yes	Secret used as the HMAC key.
RIK_API_KEY_PUBLIC	Yes	Public part of X-AUTH-KEY (from e-Financials).
RIK_API_BASE_URL	No	Base URL without trailing slash. Default: https://rmp-api.rik.ee. Set to https://demo-rmp-api.rik.ee for the demo environment.
RIK_HTTP_MAX_RETRIES	No	Extra HTTP attempts for transient failures (network errors, 408, 429, 5xx). Default: 0.
RIK_HTTP_RETRY_BASE_MS	No	Base delay in ms for exponential backoff. Default: 500.
RIK_REQUEST_TIMEOUT_MS	No	Maximum time in ms per outbound request. Default: 30000.
RIK_JOURNAL_LIST_MAX_PAGES	No	Maximum /v1/journals list pages loaded by the ledger tools (trial balance, balance sheet, P&L, account balance, month-end close) before they stop with journal_list_truncated. Default: 1000.
LOG_LEVEL	No	Pino log level on stderr: fatal, error, warn, info, debug, trace, silent. Default: info.

MCP host configuration

Point your MCP client at the built server.

Cursor (~/.cursor/mcp.json or project .cursor/mcp.json):

{
  "mcpServers": {
    "e-financials": {
      "command": "node",
      "args": ["/absolute/path/to/e-financials-mcp/dist/index.js"],
      "env": {
        "RIK_API_KEY_ID": "your_api_key_id",
        "RIK_API_KEY_PASSWORD": "your_api_key_password",
        "RIK_API_KEY_PUBLIC": "your_base64_public_key"
      }
    }
  }
}

Claude Desktop — same pattern under mcpServers in the app's config file, adjusting paths for your OS.

Alternatively, if your .env file is populated and the working directory is the project root, npm start picks up credentials automatically.

Architecture

flowchart LR
  subgraph host [MCP host]
    Client[Cursor / Claude Desktop]
  end
  subgraph mcp [e-financials-mcp]
    Server[MCP server stdio]
  end
  subgraph rik [RIK]
    API[rmp-api.rik.ee HTTPS]
  end
  Client <-->|stdio JSON-RPC| Server
  Server -->|JSON + HMAC-SHA384| API

Authentication (how requests are signed)

1. X-AUTH-QUERYTIME — UTC timestamp, one-second precision, no milliseconds.
2. X-AUTH-KEY — {RIK_API_KEY_PUBLIC}:{signature} where signature is Base64(HMAC-SHA-384) over {RIK_API_KEY_ID}:{X-AUTH-QUERYTIME}:{urlPath}.
3. urlPath is the path only (e.g. /v1/transactions), no query string.
4. User-Agent: e-financials-mcp/1.0 (+https://github.com/werkstatt-jasper/e-financials-mcp) — descriptive UA instead of Node's generic node default.
5. Requests use a plain node:https transport (src/rik-http.ts), not global fetch: undici fetch's non-removable Sec-Fetch-Mode: cors header makes Cloudflare (in front of the production API) 403-challenge requests from datacenter IPs. Cloudflare-served error responses are logged with their cf-ray ID.

MCP surface

The server advertises tools, prompts, and resources over stdio.

Tools

The server advertises the tools listed in Tools at a glance across transactions, clients, invoices, invoice settings, products, journals, accounts, reference data, and reports. All tool results are JSON in text content blocks.

Prompts

Prompt	Description
getting-started	Introduces the tool surface, efinancials:// resources, and safe-usage conventions. Optional focus argument to emphasize a topic.

Resources

Static and templated resources use the efinancials:// URI scheme.

URI	Description
efinancials://server_info	Server name, version, and capability summary (JSON; no API call).

MCP tools reference

Transactions

RIK's GET returns type: "C" for every transaction, whichever direction it was saved with. The tools read the stored direction from that day's lists. A row in the type filter (it ignores the letter and returns only incoming rows) is money in. A row that is only in the unfiltered list is money out. A row in neither list, or one with no valid date, has an unknown direction: reads return type: null, and a create is kept with direction_confirmed: false.

Tool	Description
list_transactions	List bank transactions with filters (status, dates, type, client, page). type is C money in, D money out, read from the stored direction.
get_transaction	Single transaction by ID (may include read-only items[] relation rows). type is the stored direction (C money in, D money out), or null when it is unknown (direction_confirmed: false).
get_unprocessed_transactions	PROJECT transactions with no client.
update_transaction	PATCH draft metadata (clients_id, accounts_id, description) and optional direction (type), which is checked against the stored direction. Unknown direction leaves the update in place with direction_confirmed false. Not distribution rows.
create_transaction	POST new draft (PROJECT). C is money in and D is money out; the RIK letter is translated and the stored direction is checked. Unknown direction keeps the draft with direction_confirmed false.
pay_purchase_invoice	Pay a CONFIRMED purchase invoice from a cash or bank dimension (outgoing type D) and register it. Refuses a likely duplicate unless allow_duplicate; an unconfirmed save is kept as an unregistered draft.
delete_transaction	DELETE transaction.
register_transaction	Confirm with full distributions[] (accounts / purchase_invoices / sale_invoices). UI equivalent of Add a row + Save and confirm.
invalidate_transaction	Reverse registration.
get_transaction_file	GET attached file.
upload_transaction_file	Upload file from local path, https:// URL, or base64:<data> / base64:<ext>:<data> (max 10 MiB). Optional filename overrides Content-Disposition / URL path.
delete_transaction_file	DELETE attached file.

Clients

Tool	Description
list_clients	Paginated client list.
list_suppliers	Clients with is_supplier: true.
get_client	One client by ID.
search_clients	Search over all pages (name, reg code, email).
create_client	Create a new client. Estonian private clients need is_physical_entity: true (empty reg_code alone is not enough).
update_client	Partial update, including is_physical_entity.
delete_client	Permanent removal.
deactivate_client	Soft-disable.
reactivate_client	Re-enable.

Invoices

Tool	Description
list_sales_invoices	Sales invoices with filters.
list_purchase_invoices	Purchase invoices with filters. The e-arveldaja incoming e-invoice inbox is not in the public RIK API; accept e-invoices in the web UI and they appear here as PROJECT drafts with lines on suspense account 9900 ("digiarve kulu vahekonto") — recode them with update_purchase_invoice, then confirm with register_purchase_invoice.
list_unpaid_invoices	Unpaid sales/purchase invoices.
get_sales_invoice	One sales invoice. Adds a derived due_date (create_date + term_days) when the API returns none.
get_purchase_invoice	One purchase invoice.
create_sales_invoice	Draft sales invoice. Optional trade_secret, printed invoice_info (not notes / not get_invoice_info), and journal_date (defaults to invoice_date). Omitted number_prefix uses the default invoice series prefix; omitted number_suffix continues that prefix's series (never a timestamp; prefix-less invoices don't count). Row unit is optional; omitted copies the product unit.
validate_invoice_data	Read-only pre-booking checks (totals, dates, VAT rates, FX). Free-tier on hosted SaaS.
create_purchase_invoice	Draft purchase invoice with VAT defaults + create-then-repair totals. Single-line params or items[]; non-EUR needs currency_rate. Supports reversed_vat_id (7 = non-EU, 4 = EU). Optional cl_vat_articles_id (16 = sõiduauto 100%; omit → fallback 1 when VAT-registered).
update_sales_invoice	PATCH sales draft. Optional trade_secret, invoice_info, journal_date, number_prefix, and number_suffix; omitted keeps stored values. invoice_date does not overwrite journal_date. rows use the same friendly keys as create (including optional unit) and are remapped to API items. due_date sets term_days from invoice_date (or the stored date) and is read back; the result carries due_date, due_date_applied and a warning if it was not stored. invoice_date alone keeps term_days.
delete_sales_invoice	DELETE sales invoice.
register_sales_invoice	Confirm sales invoice.
invalidate_sales_invoice	Reverse sales confirmation.
get_sales_invoice_xml	System e-invoice XML.
get_sales_invoice_pdf_system	System PDF.
get_sales_invoice_user_file	User-uploaded file.
upload_sales_invoice_user_file	Upload file (path, https:// URL, or inline base64; max 10 MiB). Optional filename.
delete_sales_invoice_user_file	Delete user file.
get_sales_invoice_delivery_options	Delivery options (e-invoice/email).
deliver_sales_invoice	Send e-invoice/email.
update_purchase_invoice	PATCH purchase draft. Optional items[] merges lines by id (omit id to append). Supports reversed_vat_id (applied to every line after the merge) and per-line cl_vat_articles_id / cl_fringe_benefits_id. CONFIRMED invoices are refused before the PATCH: take the invoice back to draft in the e-Financials UI first (there is no unregister API).
delete_purchase_invoice	DELETE purchase invoice.
register_purchase_invoice	Confirm purchase invoice after optional vat/gross repair from item sums.
invalidate_purchase_invoice	Reverse purchase confirmation.
get_purchase_invoice_user_file	User-uploaded file.
upload_purchase_invoice_file	Upload file (path, https:// URL, or inline base64; max 10 MiB). Optional filename.
delete_purchase_invoice_user_file	Delete user file.

Invoice settings

Tool	Description
get_invoice_info	Company invoice settings.
update_invoice_info	Update invoice settings.
list_invoice_series	All invoice series.
get_invoice_series	One series by ID.
create_invoice_series	Create new series.
update_invoice_series	Update series.
delete_invoice_series	Delete series.

Products

Tool	Description
list_products	Paginated product/service list.
get_product	One product by ID.
create_product	Create product.
update_product	Update product.
delete_product	Delete product.
deactivate_product	Soft-disable.
reactivate_product	Re-enable.

Journals

Tool	Description
list_journals	Paginated journal list.
get_journal	One journal entry with postings.
create_journal	Create journal with postings.
update_journal	Update journal.
delete_journal	Delete journal.
register_journal	Register journal.
invalidate_journal	Reverse registration.
get_journal_file	GET attached file.
upload_journal_file	Upload file (path, https:// URL, or inline base64; max 10 MiB). Optional filename.
delete_journal_file	Delete file.

Accounts

Tool	Description
list_accounts	Chart of accounts.
search_accounts	Search accounts by name or ID.
list_account_dimensions	Sub-accounts / dimensions.
get_bank_accounts	List bank accounts.
create_bank_account	Create bank account.
get_bank_account	One bank account.
update_bank_account	Update bank account.
delete_bank_account	Delete bank account.
get_vat_info	Company VAT / tax reference.
list_projects	Cost/profit centres.
list_purchase_articles	Purchase expense categories.

Reference data

Tool	Description
list_currencies	Active company currencies.
list_sale_articles	Sale articles linked to accounts and VAT.
list_templates	Sale invoice templates.

Reports

Tool	Description
reconciliation_report	Aggregates transactions + invoices for a period.
match_transaction_to_supplier	Word overlap scoring vs suppliers.
financial_summary	Month rollup (default: current month).

Financial statements

Tool	Description
compute_trial_balance	Trial balance from registered journal postings (optional date window; EUR base).
compute_balance_sheet	Balance sheet as of optional date_to (Varad / Kohustused / Omakapital + open P&L).
compute_profit_and_loss	P&L for required date_from / date_to (Tulud / Kulud → net_profit). Excludes year-end closing (account 9000, YEAR_CLOSING/CLOSING journals) by default and lists it in excluded_closing; include_closing: true for the raw ledger.
compute_receivables_aging	Unpaid confirmed sale invoices by overdue bucket (optional as_of_date).
compute_payables_aging	Unpaid confirmed purchase invoices by overdue bucket (optional as_of_date).
compute_account_balance	One account balance from journal postings (optional client/date filters).
compute_client_debt	Client net position across accounts (optional account_ids; else all tagged).
month_end_close_checklist	Month-end blockers: unconfirmed journals/invoices/bank txs + overdue A/R & A/P.

Bank reconciliation & classify

Tool	Description
analyze_unconfirmed_transactions	Read-only suggestions for PROJECT bank txs (duplicates, transfers, invoice matches, fees).
reconcile_bank_transactions	Modes: match, auto_confirm, transfers (dry-run by default; execute: true to mutate).
classify_bank_transactions	Modes: classify, dry_run_apply, execute_apply for unmatched counterparty groups.
process_camt053	Import CAMT.053 statements (parse / dry_run / execute). File path or base64 XML. Created rows report direction_confirmed.

Upstream API documentation

Resource	URL
Developer overview	https://abiinfo.rik.ee/en/e-financials/e-financials-api/technical-documentation-developers
API key generation	https://abiinfo.rik.ee/en/e-financials/e-financials-api/e-financials-api-key-generation
OpenAPI 3.1 spec	https://rmp-api.rik.ee/openapi.yaml
HTML API reference	https://rmp-api.rik.ee/api.html

Environments: Live https://rmp-api.rik.ee (default) | Demo https://demo-rmp-api.rik.ee

Development

npm run dev          # TypeScript watch mode
npm test             # unit tests (Vitest)
npm run test:coverage # with coverage report
npm run lint         # Biome check
npm run lint:fix     # auto-fix

Testing

Unit tests mock EFinancialsClient and never hit the real API. Shared response fixtures live in src/__fixtures__/. Integration tests in src/integration/ run against the demo API (requires RIK_API_* env vars).

npm test                # unit tests only
npm run test:integration # live integration tests

Contributing

See CONTRIBUTING.md for main as default branch, HTTPS clone, branch naming, gh pr create, and avoiding empty PRs.

License

MIT

Support for the official API: [email protected] (per OpenAPI info.contact).