Quick answer

SARB wears three hats in the National Payment System: it regulates the system under the NPS Act, operates SAMOS as the settlement infrastructure, and acts as settlement agent for participating banks by holding their settlement accounts. The same institution sets the rules, runs the rails, and books the entries.

SARB as regulator

SARB's National Payment System Department supervises the NPS under the NPS Act. It issues directives, oversees participants, designates payment systems for legal protection (notably the settlement-finality protection enjoyed by SAMOS), and represents South Africa in international standard-setting bodies like CPMI.

SARB as operator

SARB operates SAMOS — the platform itself, the SAMEX front-end, and the supporting infrastructure. This dual role (regulator and operator) is common among central banks: it ensures alignment between the system's design and the regulator's risk tolerance.

SARB as settlement agent

Settlement banks hold settlement accounts at SARB. When SAMOS settles a payment, it debits one SARB account and credits another. The settlement asset — central-bank money — is a direct claim on SARB itself, the safest claim available in the rand economy.

Tensions and trade-offs in the triple role

Combining regulator, operator, and settlement agent gives SARB enormous influence over the system but also creates governance questions: how should it ensure operational decisions do not advantage incumbent banks, and how should it open the system to new entrants without compromising stability? These tensions are at the heart of Vision 2030+ and the National Payments Utility discussions.

TL;DR

  • SARB is simultaneously NPS regulator, SAMOS operator, and settlement agent.
  • Settlement happens in claims on SARB — central-bank money.
  • The triple role concentrates expertise but creates governance debates about access and competition.

Frequently asked questions

Does SARB earn profits from SAMOS?

SARB's stated pricing principle is cost recovery, not profit.

Can SARB delegate the operation of SAMOS?

In principle, yes — the National Payments Utility concept under Vision 2030+ contemplates operational arrangements beyond SARB itself.

Is SARB on SWIFT?

Yes; SARB is connected to SWIFT for international messaging where relevant to settlement.

How does SARB ensure neutrality?

Through published rules, transparent fee schedules, industry consultation via PASA, and oversight from its NPS Department.

See also from our Modernization silo: SARB's Payments Ecosystem Modernisation (PEM) Programme and SAMOS Settlement Schedule: Operating Hours & Windows. For the foundations, return to the SAMOS homepage or browse the full Knowledge Hub.