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MCP Server

skanfirmy.pl

io.github.bartosz-kuc/skanfirmy
Business & Operations Legal & Compliance Public & reachable MCP 2026-07-28

What this MCP does

Verifies Polish companies, VAT registrations, bank accounts, registry data, EU VAT numbers, tax micro-accounts, and payment interest, with optional NIP monitoring and webhooks.

Capabilities

Tools

14 tools
changes_since
Return changes (VAT status, bank accounts, or registry data — name, address, KRS, REGON — from the White List) detected since a given date for the NIPs you monitor. The field property is one of: status_vat, account_added, account_removed, name, address, krs, regon. For natural persons (entities without a KRS number; natural_person: true) only status_vat, account_added and account_removed are returned, account numbers are masked (check digits + last 4, e.g. 61…2874) and name is null (GDPR); check a specific account with sprawdz_rachunek. A polling channel for agents. Requires a skanfirmy API key.
Input schema 
{'type': 'object', 'required': [], 'properties': {'since': {'type': 'string', 'description': 'ISO date/timestamp (e.g. 2026-08-01). Returns changes since that date. Defaults to the beginning.'}, 'api_key': {'type': 'string', 'description': 'skanfirmy API key (optional, if not in the header).'}}}
generuj_mikrorachunek
Generate the individual tax micro-account (for PIT/CIT/VAT payments) from a NIP. The server does not accept PESEL (personal ID) — for a PESEL compute it locally: BBAN = "101000712221" + PESEL + "0", IBAN = "PL" + ISO 7064 mod-97 check digits + BBAN (or use skanfirmy.pl/mikrorachunek, which computes it in the browser).
Input schema 
{'type': 'object', 'required': ['identyfikator'], 'properties': {'identyfikator': {'type': 'string', 'description': 'NIP (10 digits). PESEL is not accepted by the server.'}}}
list_observations
Return the list of NIPs you monitor, with their current VAT status and last-checked date (name is null for natural persons running a business). Each entry keeps the raw Ministry of Finance literal in status_vat and, when a status is known, adds derived language-neutral fields vat_active (boolean) and status_vat_code (active/exempt/not_registered). Requires a skanfirmy API key.
Input schema 
{'type': 'object', 'required': [], 'properties': {'api_key': {'type': 'string', 'description': 'skanfirmy API key (optional, if not in the header).'}}}
oblicz_odsetki
Calculate statutory or commercial (B2B) late-payment interest, broken down by NBP reference-rate periods.
Input schema 
{'type': 'object', 'required': ['kwota', 'dataOd', 'dataDo', 'typ'], 'properties': {'typ': {'enum': ['kc', 'h10', 'h8'], 'type': 'string', 'description': 'kc = statutory late-payment interest (Civil Code art. 481, NBP reference rate + 5.5 pp); h10 = commercial B2B transactions, non-public debtor (NBP reference rate on 1 Jan / 1 Jul + 10 pp); h8 = commercial transactions, public healthcare debtor (NBP reference rate on 1 Jan / 1 Jul + 8 pp).'}, 'kwota': {'type': 'number', 'description': 'Overdue amount in PLN.'}, 'dataDo': {'type': 'string', 'description': 'Actual payment date, format YYYY-MM-DD.'}, 'dataOd': {'type': 'string', 'description': 'Payment due date, format YYYY-MM-DD.'}}}
observe_nip
Add a NIP to monitoring. You get notified (via changes_since or email) when its VAT status, bank account, or registry data shown on the Ministry of Finance White List (name, address, KRS, REGON) changes. For natural persons running a business (entities without a KRS number) only the VAT status and masked bank accounts are monitored (GDPR): no name, address or REGON changes. Requires a skanfirmy API key (Authorization: Bearer, or the api_key argument). Free plan: up to 10 NIPs.
Input schema 
{'type': 'object', 'required': ['nip'], 'properties': {'nip': {'type': 'string', 'description': '10-digit NIP to monitor.'}, 'api_key': {'type': 'string', 'description': 'skanfirmy API key (if not provided in the Authorization header).'}}}
set_webhook
Set (or clear) a push webhook URL for your monitoring, instead of or in addition to polling. When we detect a change for a monitored NIP, we send a POST signed with HMAC-SHA256 (X-Skanfirmy-Signature header). Returns the secret ONCE. Pass an empty url to disable. Requires a skanfirmy API key. Public https addresses only (port 443).
Input schema 
{'type': 'object', 'required': [], 'properties': {'url': {'type': 'string', 'description': 'Public https URL of the receiver (empty = disable the webhook).'}, 'api_key': {'type': 'string', 'description': 'skanfirmy API key (optional, if not in the header).'}}}
sprawdz_lista_nip
Bulk-check up to 30 NIPs in one call to the Ministry of Finance VAT White List: VAT status, bank accounts, REGON, KRS number and address of each entity. For entities without a KRS number (natural persons) the address is reduced to the town and bank accounts to their count, and no REGON number or registration date is returned (GDPR) — check a specific account with sprawdz_rachunek. For verifying a portfolio of counterparties. Ministry limits: max 30 NIPs per call; the Ministry's daily query limit is shared by the whole service — when it is exhausted, the tool returns an error. Does not fetch full KRS data (use sprawdz_nip for individual entities).
Input schema 
{'type': 'object', 'required': ['nipy'], 'properties': {'nipy': {'type': 'array', 'items': {'type': 'string'}, 'maxItems': 30, 'minItems': 1, 'description': 'List of NIPs (1 to 30). Each 10-digit with a valid checksum. Invalid NIPs are returned separately in the invalidInput field.'}}}
sprawdz_nip
Check VAT status (VAT White List / Biała Lista) and KRS data for a Polish company by NIP. For entities without a KRS number (sole proprietors and civil partnerships, i.e. natural persons) personal data is limited (GDPR): the address is reduced to the town (the White List does not say whether it is a business or a home address), and bank accounts to their count — check a specific account with sprawdz_rachunek; no REGON number, registration date or PKD codes are returned for them (the ceidg field is always null). The privacy field lists what was hidden.
Input schema 
{'type': 'object', 'required': ['nip'], 'properties': {'nip': {'type': 'string', 'description': '10-digit Polish NIP (tax ID).'}}}
sprawdz_rachunek
Check whether a bank account number (NRB) appears in the VAT White List for a given NIP. Due diligence for payments above PLN 15,000.
Input schema 
{'type': 'object', 'required': ['nip', 'numerRachunku'], 'properties': {'nip': {'type': 'string', 'description': '10-digit NIP of the counterparty.'}, 'numerRachunku': {'type': 'string', 'description': '26-digit bank account number (NRB), without the PL prefix.'}}}
sprawdz_regon
Look up entity data in the REGON register (Statistics Poland / GUS BIR) by NIP: REGON number, official name, legal form (legal or natural person), address (voivodeship, county, municipality). Covers ALL entities, including sole proprietors that are not in the KRS. For natural persons (GUS type F / LF) and civil partnerships (s.c.) only the NIP, name, entity type code (typ), form (forma: 'osoba fizyczna' / 'jednostka lokalna osoby fizycznej' / 'spółka cywilna'), town and activity status (status: active / ended) are returned — no REGON number, address, administrative units or dates (GDPR); the full entry is in the GUS REGON search (privacy.officialSource).
Input schema 
{'type': 'object', 'required': ['nip'], 'properties': {'nip': {'type': 'string', 'description': '10-digit Polish NIP (tax ID).'}}}
sprawdz_vies
Validate a counterparty's EU VAT number in the VIES system (European Commission). For Polish (PL) numbers the address is reduced to the town, because the number may belong to a natural person (GDPR).
Input schema 
{'type': 'object', 'required': ['countryCode', 'vatNumber'], 'properties': {'vatNumber': {'type': 'string', 'description': 'VAT number without the country prefix.'}, 'countryCode': {'enum': ['AT', 'BE', 'BG', 'CY', 'CZ', 'DE', 'DK', 'EE', 'EL', 'ES', 'FI', 'FR', 'HR', 'HU', 'IE', 'IT', 'LT', 'LU', 'LV', 'MT', 'NL', 'PL', 'PT', 'RO', 'SE', 'SI', 'SK', 'XI'], 'type': 'string', 'description': 'Two-letter EU country code (e.g. DE, IE, FR).'}}}
szukaj_katalog_api
Search otwarteAPI.pl, a catalog of public Polish and EU APIs (VAT, KRS, GUS, NBP, ECB, Eurostat and more). Returns matching entries with a link to each API's official docs. An empty query returns the whole catalog (optionally narrowed by scope or topic).
Input schema 
{'type': 'object', 'required': [], 'properties': {'temat': {'type': 'string', 'description': 'Narrow to a specific catalog tag, e.g. "firmy" or "dane-statystyczne". Optional.'}, 'zasieg': {'enum': ['PL', 'EU'], 'type': 'string', 'description': 'Narrow to Polish (PL) or EU APIs. Optional.'}, 'zapytanie': {'type': 'string', 'description': 'Natural-language query, e.g. "euro exchange rate" or "weather data". Optional.'}}}
szukaj_pkd
Search PKD 2025 business activity codes by activity name or code number.
Input schema 
{'type': 'object', 'required': ['zapytanie'], 'properties': {'zapytanie': {'type': 'string', 'description': 'Activity name (e.g. "software") or PKD code (e.g. "62.01").'}}}
unobserve_nip
Stop watching a NIP (it stays on your list of ended watches until you unsubscribe). Requires a skanfirmy API key.
Input schema 
{'type': 'object', 'required': ['nip'], 'properties': {'nip': {'type': 'string', 'description': '10-digit NIP to stop watching.'}, 'api_key': {'type': 'string', 'description': 'skanfirmy API key (optional, if not in the header).'}}}
History

Recent tool changes

Changed
changes_since
Sept. 29, 2026, 2:51 a.m.
Changed
list_observations
Sept. 29, 2026, 2:51 a.m.
Changed
unobserve_nip
Sept. 29, 2026, 2:51 a.m.
Changed
observe_nip
Sept. 29, 2026, 2:51 a.m.
Changed
sprawdz_regon
Sept. 29, 2026, 2:51 a.m.
Changed
sprawdz_lista_nip
Sept. 29, 2026, 2:51 a.m.
Changed
sprawdz_nip
Sept. 29, 2026, 2:51 a.m.
Changed
generuj_mikrorachunek
Sept. 27, 2026, 2:43 a.m.
Changed
sprawdz_vies
Sept. 27, 2026, 2:43 a.m.
Changed
sprawdz_regon
Sept. 27, 2026, 2:43 a.m.
Changed
sprawdz_lista_nip
Sept. 27, 2026, 2:43 a.m.
Changed
sprawdz_nip
Sept. 27, 2026, 2:43 a.m.
Added
set_webhook
Sept. 17, 2026, 12:40 p.m.
Added
changes_since
Sept. 17, 2026, 12:40 p.m.
Added
list_observations
Sept. 17, 2026, 12:40 p.m.
Added
unobserve_nip
Sept. 17, 2026, 12:40 p.m.
Added
observe_nip
Sept. 17, 2026, 12:40 p.m.
Added
szukaj_katalog_api
Sept. 17, 2026, 12:40 p.m.
Added
oblicz_odsetki
Sept. 17, 2026, 12:40 p.m.
Added
szukaj_pkd
Sept. 17, 2026, 12:40 p.m.
Added
generuj_mikrorachunek
Sept. 17, 2026, 12:40 p.m.
Added
sprawdz_rachunek
Sept. 17, 2026, 12:40 p.m.
Added
sprawdz_vies
Sept. 17, 2026, 12:40 p.m.
Added
sprawdz_regon
Sept. 17, 2026, 12:40 p.m.
Added
sprawdz_lista_nip
Sept. 17, 2026, 12:40 p.m.
Added
sprawdz_nip
Sept. 17, 2026, 12:40 p.m.
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