🔀 National switches and clearing houses

What a switch routes, and what it doesn’t settle

A domestic switch is a message router. It receives a request from an institution, identifies the recipient, carries the message, and brings back the response. It neither holds funds nor moves them. Its job is limited to routing the message, normalizing it into a common format, and logging the exchange. Moving the money happens one layer down, first at the clearing house and then in the settlement system.

The switch has a second function that is less visible but shapes the market more: it sets the rules its participants must follow. Those rules cover message format, response times, reject reasons, domestic interchange, access fees, and availability requirements. An institution that connects therefore signs up to that whole rulebook, not just to a message transport service.

Three layers: switch, clearing house, central bank money

In almost every country, retail payment infrastructure breaks down into three stacked layers. One or more retail switches route the transactions, one or more clearing houses calculate positions, and a central bank settlement system delivers finality. The vocabulary varies from country to country, but the structure barely does. Once you identify these three entities, you know where message standards, access fees, and participation status come from, since each is set by one of their rulebooks.

The settlement system’s operating hours constrain the two layers above it. A retail rail advertised as 24/7 can’t settle in central bank money while the RTGS is closed. Operators work around this with prefunding: participants set aside balances before the RTGS closes, and net positions are squared up when it reopens. That tied-up cash is a real liquidity burden for connected participants, and the rails’ sales materials rarely mention it.

• Who is the technical operator, and who owns the scheme? In the UK, Pay.UK owns Bacs and the Faster Payments Service, and Vocalink (Mastercard) operates them. That means two counterparties and two contracts.
• How many switches does the country have? Mexico has two (Prosa and E-Global), Indonesia has four licensed under GPN (Artajasa, Rintis, Alto, Jalin), and Israel has one (Shva).
• Where do positions settle? A rail that doesn’t settle in central bank money exposes its participants to the risk of its settlement bank.
• What are the settlement windows? The number of daily cycles determines when funds become available, and therefore the merchant’s cash flow.

Deferred or real-time clearing: what each choice costs

Deferred net settlement and real-time gross settlement are the two ways payment infrastructures execute payments. The first aggregates the transactions of a given period, nets them multilaterally, and settles only the resulting balances. The second processes each transaction individually and immediately, with no netting. Deferred settlement saves liquidity but creates exposure between participants; real-time settlement removes that exposure but consumes liquidity. The two models coexist in almost every country. Neither is better than the other; each addresses a different set of risks.

Deferred clearing rails still handle large volumes. The US ACH Network processed 35.2 billion payments worth $93 trillion in 2025, under Nacha rules and through two competing operators, FedACH and EPN (Nacha, 2026). Same Day ACH adds three same-day settlement windows, and its per-payment limit was raised to $1 million in 2022. In Australia, BECS was slated for shutdown in June 2030, but AusPayNet dropped that target date in December 2025 because there was no replacement roadmap.

Who owns the switch: five ownership models

A national switch’s ownership structure means who its shareholders are and the governance that follows from that. Five configurations cover nearly every market. Each one shapes pricing, how quickly services evolve, and the terms on which new participants get access. In a bank-owned consortium, pricing reflects the member banks’ interests first; a central bank subsidiary answers first to its parent’s public policy goals.

Asia: the switch as a public policy tool

In Asia, several governments have given their domestic switch two goals beyond its technical role. The first is sovereignty: domestic transactions are routed through supervised national infrastructure rather than an international network. The second is pricing: public authorities set or cap the fee for accessing the rail. The National Payments Corporation of India (NPCI) is the most widely copied model. It runs the National Financial Switch, which it took over from the IDRBT in 2009, the RuPay card scheme, the Aadhaar Enabled Payment System, the NACH bulk clearing system, the Bharat Connect bill payment rail, and the Unified Payments Interface. All of these rails sit within a single not-for-profit entity, owned by the banks and supervised by the Reserve Bank of India.

How you get onto these rails varies enormously from country to country. In India, direct access to UPI is still limited to banks, so a foreign company has to go through a TPAP (third-party app provider) partnership or a sponsor bank. In Korea, an integrator never reaches issuers directly; it goes through a licensed VAN (Nice Information & Telecom, KIS Information, KICC, Smartro) or a PG (payment gateway). In Indonesia, domestic card transactions must be routed through a local switch licensed under GPN, a requirement the Office of the US Trade Representative challenges in its 2025 trade barriers report.

Africa: from card switches to mobile money switches

African switches were built first to connect siloed ATM networks, and then to connect mobile wallets that couldn’t talk to one another. Nigeria is the clearest example of the first generation. NIBSS, owned by the Central Bank of Nigeria and the banks, has run NIBSS Instant Payment since 2011. It is available 24/7 and addresses payments by account number or BVN (Bank Verification Number). The rail processed nearly 11 billion transactions in 2024 (NIBSS/CBN, 2025), and cards have become a sideshow for person-to-person payments.

The second generation of African switches routes e-money wallets. Ghana’s Mobile Money Interoperability, launched by GhIPSS in 2018 under a regulatory mandate, was the first system on the continent to connect wallets to each other and to bank accounts. Tanzania and Rwanda adopted the model. GhQR, Ghana’s QR code standard launched in 2020, has genuine reach but remains a commercial disappointment. Acceptance coverage shows that the standard is available; it says nothing about whether merchants and customers actually use it.

The Gulf, the Levant, and the Americas: the unavoidable gateway

In the Gulf and the Levant, domestic card acceptance usually runs through a single operator per country. In the Gulf, these national switches predate the regional instant payment rails by 20 years. KNET, owned by Kuwait’s banks, has operated since 1992 and still holds a near-monopoly on domestic acceptance, including e-commerce. BENEFIT in Bahrain and SARIE in Saudi Arabia date from 1997, as does GCCNet, which links the region’s ATM networks. A mada cardholder who withdraws cash in Kuwait goes over GCCNet, not an international network.

Concentration varies widely across the Americas. Mexico runs as a duopoly: every issuer or acquirer must connect to Prosa or E-Global, a setup that Cofece, the competition authority, has examined. Prosa is owned by Banorte, Santander México, Scotiabank México, HSBC México, Invex, and Banjército; E-Global is owned by BBVA México and Citibanamex. In the Dominican Republic, CardNET and AZUL form the same kind of pair, with no significant third option. In the US, by contrast, bulk clearing relies on two competing ACH operators that follow a single rulebook.

De facto monopolies and what they do to pricing

A national switch is a natural monopoly. Its value grows with every participant that connects, so duplicating the network makes no economic sense. The monopoly itself isn’t the problem. The problem arises when the switch is owned by firms that also sell in the downstream market and nothing constrains the access price. A consortium of acquirers that owns the switch then sets the price of its own inputs.

The same pattern shows up in several markets: one operator dominates the domestic infrastructure. In Morocco, the Centre Monétique Interbancaire, set up by nine banks in 2001, was for years the only card acquirer, and its competitive position is a recurring topic of public debate. In Japan, CAFIS is run by NTT Data rather than the banks, which partly explains the historically high cost of acceptance. In Spain, Redsys handled about 80% of transaction volume from its creation in 2011, and its gateway is still the mandatory integration point for local e-commerce. In Chile, it took a ruling by the Tribunal de Defensa de la Libre Competencia to force Transbank to switch to the four-party model, and Getnet Chile is the company through which that opening actually happened.

• Competing operators exist, but they are rare. In the US, FedACH and EPN run side by side under Nacha rules; in New Zealand, Worldline NZ and EFTPOS New Zealand operate under the single CECS framework.
• An interoperability mandate doesn’t create usage. GhQR in Ghana and CoDi in Mexico are deployed technically but have disappointed commercially: CoDi averaged about 9,900 transactions a day in 2024 (industry sources, 2025).
• Acceptance isn’t enough either. PROSTIR is accepted at nearly every POS terminal in Ukraine yet holds less than 1% market share because too few cards are issued (NBU, 2026). The bottleneck is bank issuance.
• A monopoly can be imposed as a regulatory tool. Since June 2018, NetsUnion has required all online payments by Chinese nonbank institutions to run through supervised infrastructure instead of direct bank connections.

What a new PSP has to connect to

Connecting a payment service provider to domestic infrastructure starts with determining its participation status. There are three: direct participant, indirect participant through a sponsor bank, and plain customer of a member. They come with different rights and different obligations. The status you land on then determines the collateral required, the certification you must pass, how liability is shared, and the pricing you pay.

• Nonbank access isn’t a given. TCIB in the SADC region is open to e-money institutions and mobile money operators; LAPNet in Laos connected its first nonbank wallet, MmoneyX, on July 2, 2025.
• Membership can be mandatory. Pix requires every institution with more than 500,000 accounts to join; Bre-B requires Colombian institutions to join.
• Domestic routing can be mandated. MyDebit in Malaysia requires debit transactions to be routed domestically first; in Indonesia, GPN requires them to go through a licensed local switch.
• The technical path isn’t the contractual path. In Nigeria, merchant integration starts with NIP on the rail side, but the technical flow goes through Interswitch before reaching NIBSS.
• Some markets prohibit a direct connection. In Korea, merchants accept payments through a VAN or a PG; in Iran, no PSP operates outside Shaparak.