Bre-B, SPEI and PIX: What changes with instant rails in LATAM

The three instant rails of Colombia, Mexico and Brazil are redefining how money moves across the region. Here is what you need to know to operate with them.

What are instant rails?

An instant rail is a payment system operated by a country's monetary authority that allows money to be transferred between bank accounts in seconds, 24 hours a day, 7 days a week. In LATAM, the three main ones are Bre-B in Colombia, SPEI in Mexico and PIX in Brazil.

The fundamental difference from traditional systems (such as ACH or conventional bank transfers) is settlement time: while a traditional transfer can take between 1 and 3 business days, an instant-rail payment settles in seconds.

Bre-B: Colombia's rail

Bre-B is Colombia's immediate payments system, operated by Banco de la República. It launched in 2024 and is gradually replacing PSE and the earlier immediate-debit systems. Its average settlement speed is 4 seconds.

What sets Bre-B apart is its native interoperability: any account at any Colombian bank can receive Bre-B payments, without both institutions needing a direct integration. This eliminates the banking-fragmentation problem that had slowed digital payments in Colombia.

SPEI: the most mature system

Mexico's Interbank Electronic Payment System has been operating since 2004, making it one of the most mature real-time payment systems in Latin America. It settles in 12 seconds on average and processes more than 10 million transactions daily.

SPEI is mandatory for all banks in Mexico, which guarantees 100% coverage of the financial system. This makes it especially valuable for B2B disbursements where the beneficiary may be at any institution.

PIX: the fastest rail

PIX was launched by the Banco Central do Brasil in November 2020 and quickly became the most-used payment system in Brazil. With a settlement time of under 2 seconds, it is also the fastest of the three.

In less than 3 years since its launch, PIX overtook debit cards as the most-used payment method in Brazil. Today it processes more than 4 million transactions per hour on high-demand days.

What does this mean for your operation?

If your company moves money between Colombia, Mexico and Brazil, instant rails let you reduce settlement times from days to seconds, eliminate bank maintenance windows, operate 24/7 without depending on business hours, and reduce the operating costs tied to manually managing pending payments.

The key is accessing all three rails from a single integration. Keeping separate integrations with each system not only multiplies the technical work, it also fragments treasury data and complicates reconciliation.

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