02
4.0
#1Doklado
Slovensko·od 2020
Invoice receiving
€0 (Free, 7 dokl./mes) · €9,90/mes (PLUS, 70 dokl.)
Invoice sending
V cene plánu · €0,20+DPH za doklad nad limit
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
comparison
Best Digital Mailbox Provider 2026: Comparison
Providers certified by the Financial Administration of the Slovak Republic — pricing, features, and integrations in one place. Choose the right e-invoicing partner before the mandatory 2027 deadline.
The ranking and ratings of competing providers come from the independent CPDS comparison portal digitalny-postar.eu — for more details and full reviews, visit it directly.
Updated: 28 May 2026
01 / Náš návrh
ePošťák
Slovenský digitálny poštár certifikovaný FS SR pod číslom EFSK000012. Postavený na vlastnom Peppol Access Point — žiadny proxy cez tretiu stranu.
◆ EFSK000012
0245:{DIČ}
0245:{DIČ}
Invoice receivingcez dashboard
€0
NAVŽDY
Invoice sendingcez dashboard
€0
DO 31.12.2026
Po 1. 1. 2027 — štandardný cenníkaktuálny plán
€8
/ MESIAC
- ✓Vlastný Peppol AP — žiadny proxy cez tretiu stranu, plný EFSK000012 status v registri FS SR
- ✓Multi-firm dashboard — účtovníci spravujú neobmedzene klientov z jedného účtu
- ✓Enterprise API + SAPI 1.0 — oba štandardy bez doplatku, OAuth client_credentials + dokumenty cez UBL
- ✓Peppol directory + kalkulačka — verejné vyhľadávanie partnerov + okamžitý odhad nákladov pre integrátorov
- ✓Príjem €0 navždy — nie len do 2027 ako väčšina konkurencie — žiadne časové obmedzenie
02alternatívy
Ostatní poskytovatelia
Karty {totalProviders - 1} alternatív zoradených podľa CPDS hodnotenia z digitalny-postar.eu. Klik na meno otvorí ich CPDS profil.
Filter33 / 33
CPDS profil
03
4.0
#2Asseco Solutions
Slovensko·od 1990
Invoice receiving
€0 (Starter, do 50 dok./mes spolu)
Invoice sending
€9,90 / €29 / €69 / €299+ (Basic / Business / Pro / Custom)
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
04
3.5
#3Billit
Belgicko·od 2014
Invoice receiving
€7,50/mes (Standard) · príjem v cene plánu
Invoice sending
€0 (Free, len odosielanie) · od €7,50/mes
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
05
3.0
#4Qvalia
Švédsko·od 2010
Invoice receiving
€0 (Free, 1 správa/mes) · spolu s odoslaním
Invoice sending
Small €9 (25) · Medium €39 (100) · Large €99 (1 000)
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
06
3.0
#5SOFTIP Digitálny poštár
Slovensko·od 1991
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
07
3.0
#6EY
Slovensko·od 1989
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
08
3.0
#7ESO9
Česká republika·od 1997
Invoice receiving
od €9/mes (Základní, 50 dok. spolu)
Invoice sending
Základní €9 · Stredné/malé €39 · Rastový €99 · Veľký €199 · Korp. €399
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
09
3.0
#8Foaf
Slovensko·od 2010
Invoice receiving
~€4,40/mes (vrátane DPH, cez Trovi)
Invoice sending
~€4,40/mes (Štandard) · €9,90/mes (Premium)
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
10
2.5
#9Flowis / DigitálnyPoštár
Slovensko·od 2008
Invoice receiving
€0 na 3 r. (reg. do 31. 12. 2026), potom €0,99/mes
Invoice sending
nezverejnené
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
11
2.5
#10GRiT
Česká republika·od 1996
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
12
2.5
#11MIBFORMA
Slovensko·od 1995
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
13
2.5
#12Pagero
Švédsko·od 2000
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
14
2.0
#13Editel S.A.
Poľsko·od 1990
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
15
2.0
#14PwC Hungary
Maďarsko·od 1998
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
16
2.0
#15EDICOM
Španielsko·od 1995
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
17
2.0
#16EVERIFIN
Slovensko·od 2017
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
18
2.0
#17Fitek
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
19
2.0
#18ReSOFT / Refis
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
20
1.5
#19Pohoda EFA
Slovensko·od 1993
Invoice receiving
~€15/mes (orientačne)
Invoice sending
~€28/mes (orientačne)
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
21
1.5
#20Lhosting
Slovensko·od 2002
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
22
1.5
#21Hekura
Česká republika·od 2005
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
23
1.0
#22eConnect
Holandsko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
24N/R
MRP-Company
Slovensko·od 1991
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
25N/R
Ionite (ion-AP)
Holandsko·od 2015
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
26N/R
Fakturix (thinkio)
Slovensko·od 2025
Invoice receiving
od €0,99/mes (MINI, neobmedzene)
Invoice sending
MINI €0,99 (3 fakt.) · Starter €4,99 (50) · Pro €14,99 (∞)
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
27N/R
SLOVAKODATA
Slovensko·od 1991
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
28N/R
All Soft Corp
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
29N/R
Archiles
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
30N/R
Efaktura
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
31N/R
Efakturuj
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
32N/R
AIMTEC
Česká republika
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
33N/R
Verteco
Slovensko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
34N/R
CONSEIL RECUPERATION TVA
Francúzsko
Invoice receiving
On request
Invoice sending
On request
Freemium
API
Multi-firm
Peppol
Podpora SK
Príjem €0
◆ CPDS DATABÁZA
ℹ️ More information
on each provider is available at digitalny-postar.eu — the independent CPDS comparison portal for the Slovak market. Star ratings in the table come from there. Last updated 2026-05-09.
03kontext
Why compare digital mailbox providers?
From 2027, every business and sole trader in Slovakia will be required to send and receive electronic invoices through the IS EFA system of the Financial Administration of the Slovak Republic. To connect to this system you need a certified digital mailbox provider — an intermediary that delivers your invoices to the recipient in a structured UBL 2.1 format.
As of 28 May 2026, the Slovak Financial Administration's certified provider list contains 34 vendors — ranging from local Slovak ERP firms through Big-4 audit advisors to global e-invoicing players. Only 5 of them publish a full price list in EUR (Asseco, Doklado, Billit, Qvalia, ESO9); 2 more publish prices partially (Flowis, Pagero/Thomson Reuters). The remaining providers typically require contacting the sales team or still have product information in progress.
This overview compares all 34 certified providers across 15 criteria — from pricing and Peppol certification to the availability of an API and customer support. The goal is not just to find the cheapest option, but the provider best suited to your type of business — whether you are a sole trader, a mid-size company, an online shop, an accounting firm, or a multinational corporation.
Every provider must meet the baseline requirements of the Financial Administration, so all are legally equivalent in terms of compliance. The differences lie in pricing transparency, user experience, automation, support localisation, and accessibility for Slovak micro-businesses. The market is young and pricing is still in flux — the figures shown here reflect May 2026 and may change before the 1 January 2027 mandate.
How to get started with e-invoicing?
From May 2026 you can verify your company on the Financial Administration portal and select your digital mailbox provider. If you choose Kaja Solutions s.r.o. (ePošťák), we will automatically send you an email — click the link, set your password, and you are ready to start using the dashboard.
We will automatically register you in the Peppol SMP (Service Metadata Publisher), so your company will be immediately visible in the Peppol Directory and ready to send and receive e-invoices. The entire process takes less than two minutes.
For companies with their own ERP or accounting system, the Enterprise API is available with over 48 endpoints, TypeScript and Python SDKs, and a full OpenAPI reference. You can also issue invoices via a Telegram bot — just photograph an invoice or type "invoice XY for €500" and the bot will create, validate, and send the invoice for you. We demonstrated this feature at a Financial Administration webinar.
04 / konkurencia
Detail každého poskytovateľa
Kompaktný prehľad pre každého konkurenta — šesť kľúčových kritérií, ceny príjmu a odosielania, CPDS rating. ePošťákove parametre nájdeš v sekcii 01.
+ ÁNO
◐ ČIASTOČNE
− NIE / N/A
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
€0 (Free, 7 dokl./mes) · €9,90/mes (PLUS, 70 dokl.)
Odosielanie
V cene plánu · €0,20+DPH za doklad nad limit
SK + EÚ (Peppol)CPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
€0 (Starter, do 50 dok./mes spolu)
Odosielanie
€9,90 / €29 / €69 / €299+ (Basic / Business / Pro / Custom)
SK + EÚ (Peppol)CPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
€7,50/mes (Standard) · príjem v cene plánu
Odosielanie
€0 (Free, len odosielanie) · od €7,50/mes
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
€0 (Free, 1 správa/mes) · spolu s odoslaním
Odosielanie
Small €9 (25) · Medium €39 (100) · Large €99 (1 000)
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
od €9/mes (Základní, 50 dok. spolu)
Odosielanie
Základní €9 · Stredné/malé €39 · Rastový €99 · Veľký €199 · Korp. €399
CZ + SKCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
~€4,40/mes (vrátane DPH, cez Trovi)
Odosielanie
~€4,40/mes (Štandard) · €9,90/mes (Premium)
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
€0 na 3 r. (reg. do 31. 12. 2026), potom €0,99/mes
Odosielanie
nezverejnené
SK + EÚ (Peppol)CPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
CZ + SKCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
PL + EÚCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
SK + EHPCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
SK + EÚ (Peppol)CPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
~€15/mes (orientačne)
Odosielanie
~€28/mes (orientačne)
CZ + SKCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
CZ + SKCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
od €0,99/mes (MINI, neobmedzene)
Odosielanie
MINI €0,99 (3 fakt.) · Starter €4,99 (50) · Pro €14,99 (∞)
SK + EÚ (Peppol)CPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
CZ + SKCPDS profil ↗
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
Kľúčové kritériá
PríjemFreemiumAPIMulti-firmPeppolSK podpora
Príjem
On request
Odosielanie
On request
GlobalCPDS profil ↗
✓ yes · ✗ no · ~ partial · verifying = awaiting confirmation · Unknown = information not publicly available
05 / what to look for
What to evaluate when choosing
06 kritérií
pred podpisom
pred podpisom
01Kritérium
Pricing and transparency
Compare not just the monthly fee but also the per-document cost for sending and receiving. Some providers offer free receiving — others charge per invoice. ePošťák does not charge for receiving. Also watch out for hidden fees on API calls, data exports, or archiving older invoices. A clear price list with no asterisks is a basic indicator of a trustworthy provider.
02Kritérium
Integrations with your software
If you use an accounting system (POHODA, Money S3, MRP, or a custom ERP), check for API availability or a direct integration. Manually downloading invoices quickly becomes unsustainable. ePošťák offers an Enterprise API with over 48 endpoints, TypeScript and Python SDKs, webhook notifications, and a full OpenAPI reference. For companies with their own ERP, an API-first approach is essential.
03Kritérium
Customer support and reliability
A digital mailbox provider is critical infrastructure — if it goes down, you stop receiving invoices. Verify whether the provider has an SLA, communicates in Slovak, and is reachable on working days. ePošťák also offers support via Telegram, which many sole traders find more convenient than email or a ticketing system.
04Kritérium
Peppol and international invoicing
If you invoice internationally or receive invoices from foreign suppliers, Peppol certification is essential. Peppol is the international standard for e-invoice exchange, in use in Belgium, Norway, Italy, Germany, and many other countries. ePošťák has been a member of OpenPeppol since March 2026 and is a certified Peppol access point — enabling invoicing across the entire Peppol ecosystem.
05Kritérium
Liability for damages
What happens if your provider fails to deliver an invoice on time and you receive a penalty for the delay? Some providers clearly define liability for service outages in their terms and conditions. Review each provider's general terms before signing up.
06Kritérium
Scalability and future-proofing
Consider how your business will grow. You may need 50 invoices per month today, but 500 in a year. Choose a provider that can scale with you — flexible plans, an API for automation, and multi-client access are key for growing businesses.
06 / recommendations
Which provider is right for you?
Every type of business has different requirements from a digital mailbox provider. Below are our recommendations by company size and industry, based on publicly available information about each provider's features.
6 segmentov
ePošťák vs trh
ePošťák vs trh
01
Sole traders and small businesses
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
Sole traders and small businesses processing up to 50 invoices per month will appreciate simple onboarding, a freemium plan with no commitment, and free invoice receiving. ePošťák is designed so you can start using e-invoicing within two minutes — no sales call required. The smallest firms may also find Asseco QASIDA's free Starter plan (up to 50 invoices/month) or Doklado's free plan (up to 7 documents/month) worth considering.
02
Mid-size businesses
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák or Flowis
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
Mid-size companies (50–500 invoices per month) need API integration, automation, and reliable support. ePošťák offers an Enterprise API with 48+ endpoints, a TypeScript/Python SDK, webhook notifications, and batch operations at a transparent price. Flowis is an alternative for companies already using their process management ecosystem. Both providers hold Peppol certification for international invoicing.
03
Large enterprises
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák, EY, or Flowis
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
Enterprises processing thousands of invoices per month need robust API access, batch operations, and webhook integration. ePošťák offers an Enterprise API with 48+ endpoints, TypeScript and Python SDKs, batch sending, OCR extraction, a webhook queue with guaranteed delivery, and a full OpenAPI reference — at a fraction of the cost of enterprise solutions from EY or Flowis. EY, as a Big Four firm, also provides tax compliance advisory. For enterprises seeking a technically advanced solution without the enterprise price tag, ePošťák is the ideal choice.
04
Online shops
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
Online shops benefit from ePošťák's REST API, which automatically generates and sends e-invoices for every order. The same API works for WooCommerce, Shopify, and custom platforms.
05
Accountants and accounting firms
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
Accountants managing multiple clients need multi-client access — the ability to manage invoices for multiple company registration numbers from a single account. ePošťák supports this natively. It also offers bulk invoice downloads, filtering by client, and automatic notifications for new invoices.
06
IT companies and developers
◆ Sme medzi top voľbami ePošťák pre tento segment
ePošťák
- +Príjem cez dashboard zdarma — bez časového limitu.
- +Odosielanie 0 € do 31. 12. 2026, potom od 8 €/mes podľa aktuálneho cenníka.
- +Slovenská podpora, vlastný Peppol AP (EFSK000012), multi-firm dashboard zdarma.
Alternatívy z trhu
Žiadne explicitné alternatívy pre tento segment.
IT firms and developers prioritize a robust API with high-quality documentation. ePošťák is built API-first — the Enterprise API has 48+ endpoints, TypeScript and Python SDKs, a webhook queue, batch operations, OCR extraction, and a sandbox environment. The full OpenAPI specification and interactive documentation are available at epostak.sk/api/docs.
07frequently asked questions
Questions about choosing a digital mailbox provider
All certified digital mailbox providers meet the baseline requirements of the Financial Administration of the Slovak Republic — receiving and sending e-invoices via IS EFA. The differences are in pricing, user experience, API availability, support for accountants managing multiple companies, and customer support quality. Some providers focus on small businesses and sole traders, others on the enterprise segment processing thousands of invoices per month. The key is to choose based on your actual needs, not just on price.
Yes. Switching providers is technically possible — the Financial Administration allows you to change your assignment. We recommend choosing correctly from the start, however, as migrating invoice history can be complex and time-consuming. The process typically takes 1–3 working days and involves registering with the new provider, updating your assignment in IS EFA, and optionally exporting history from your previous provider.
ePošťák is certified by the Financial Administration of the Slovak Republic as a digital mailbox service provider. You can find it on the official list at the FS SR portal. In addition to FS SR certification, ePošťák holds Peppol certification, enabling it to handle international e-invoices across the entire European Peppol ecosystem.
ePošťák supports multi-client access — you can manage e-invoices for multiple company registration numbers from a single account. This is an essential feature for accounting firms and external accountants. Verify this feature with other providers before signing up. In our comparison, ePošťák, EY, and Asseco QASIDA all confirm multi-client support.
Technically yes — the Financial Administration does not limit the number of digital mailbox providers per company. In practice, however, this creates confusion as invoices would arrive in multiple places, making it difficult to maintain a clear overview. If you have a specific reason (such as separating domestic and international invoices), it is better to find a single provider that handles both. ePošťák's Peppol certification covers both domestic and international invoicing from one interface.
Your invoices are also stored in the IS EFA system of the Financial Administration. If your provider ceases operations, you can choose a new one and continue sending and receiving invoices without data loss. Invoice history in the FS SR system is preserved regardless of which provider you use. When selecting a provider, however, we recommend considering its stability and financial backing — established companies with transparent funding are less risky than new startups.
A higher-priced provider is worth it when you need advanced features: automatic ERP synchronisation, a dedicated account manager, an SLA with guaranteed uptime, or advanced reporting. For a company processing 20 invoices per month, a premium solution is unnecessary overhead. For a company with 2,000 invoices and an automation requirement, an enterprise solution can save dozens of hours of manual work per month. Consider value for money — ePošťák offers many enterprise features (API, multi-client, Peppol) at pricing aimed at small and medium-sized businesses.
Switching involves three steps: (1) registering with the new provider and verifying your company, (2) updating your assignment in the IS EFA system of the Financial Administration — an administrative action done through the FS SR portal, and (3) optionally exporting historical data from your previous provider. The entire process typically takes 1–3 working days. A brief gap in invoice receiving may occur during the transition, so we recommend scheduling the switch at the beginning of the month.
08methodology
How we compared
This comparison draws from publicly available sources as of May 2026 — provider websites, official price lists, documentation, OpenAPI specifications, and general terms and conditions. We also reviewed dedicated Peppol landing pages (asseco-peppol.com, digitalnypostar.com, eso9peppol.eu, fakturix.sk) and the global pricing of foreign providers. We evaluated 15 criteria — from receiving and sending price, freemium availability, API and multi-client access, through Slovak-language support and Peppol certification, to Telegram bots and liability for damages. For the 5 providers with a fully public price list (Asseco, Doklado, Billit, Qvalia, ESO9) we cite specific EUR prices; for the rest we mark 'on request' or 'verifying'.
Information was last updated on 28 May 2026 according to the Financial Administration's certified provider list. Where data was not publicly available, we show 'verifying' or 'Unknown' — we do not fill in speculation. The market is young and pricing is in active flux ahead of the 1 January 2027 mandate, so we recommend re-checking prices directly with the provider before signing a contract. If you represent one of the providers and would like to update your information, contact us at info@epostak.sk. We are the authors of ePošťák, so this comparison is not neutral — but we strive to be fair, transparent, and where competitors have a stronger offer in a specific segment, we acknowledge it.
Information about competitors is gathered from publicly available sources as of May 2026 and may be inaccurate or outdated (the market is in active pricing flux). Re-verify prices with each provider before signing. If you represent one of the providers and would like to update your information, contact us at info@epostak.sk.
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