Mercurius Service Transition – Information for Fidus Users
Background
On 17 July 2026, the Federal Public Service (FPS) BOSA announced an evolution of the technical and contractual infrastructure of the federal Mercurius service, used for transmitting electronic invoices between businesses and government administrations.
This evolution follows the new federal framework contract for eDelivery services and the significant increase in the use of electronic invoicing, particularly since the entry into force of the mandatory electronic invoicing requirement between businesses (B2B).
What does this evolution mean for Fidus users?
If your administration uses Mercurius via Fidus, no action is required on your part.
Paradigm will coordinate this transition with FPS BOSA in order to limit the impact on Brussels administrations as much as possible.
Any necessary technical information will be communicated to you in due time, where applicable.
Cost coverage
To ensure continuity of service and avoid penalizing Brussels administrations, Paradigm will cover, in 2027, the costs related to the new federal contract for Mercurius flows used via Fidus.
Administrations using Mercurius via Fidus will therefore not need to take any contractual steps or budget separately for 2027.
The terms applicable beyond 2027 will be communicated at a later stage.
Frequently Asked Questions
Do I need to sign a contract with the new provider?
No, if you use Mercurius via Fidus.
Paradigm will handle this transition for Brussels administrations.
Do I need to plan for additional budget?
No, not for 2027.
Paradigm will cover the costs related to the new federal contract.
Do I need to modify my application?
No action is required at this stage.
Should any technical adjustments prove necessary, Paradigm will support you and communicate the relevant information in advance.
Who to contact?
For any questions regarding the use of Mercurius via Fidus, or if you are a Brussels administration but do not yet go through Fidus:
Fidus Service – Paradigm
irisline@paradigm.brussels
Summary
Action required from your administration - None at this stage
Service continuity - Ensured
2027 costs - Covered by Paradigm
Technical adjustments - Managed and communicated by Paradigm if needed
Contact - Fidus Service – irisline@paradigm.brussels