Understanding The PYG and UYU FX Corridors

Paraguay and Uruguay are non-dollarized Mercosur economies with FX trading markets that are far thinner than Brazil or Argentina.

Paraguay's guaraní has significantly strengthened against the dollar in recent months (from roughly 8,000 per dollar a year ago to around 6,540 by late March 2026). At the time of writing, Banco Central del Paraguay maintains a neutral stance, declining to intervene even as exporter associations have pushed back against the stronger currency. 

Uruguay's banking system runs on both pesos and dollars simultaneously, with dollar-denominated deposit and lending accounts.The Banco Central del Uruguay has been  working to shift activity back toward the peso, but the need for the dollar to buffer against sector-specific shocks remains. 

This document covers both corridors together, given their shared context as Mercosur economies at comparable scales. It walks through a FX transaction, describing how the SML (which allows Mercosur countries to settle trades in local currency) applies to intra-regional flows.

Corridor at a glance

How the rails work

Paraguay

SIP, rebranded from SIPAP in April 2026, is Paraguay's payments infrastructure, run by the BCP. Its instant-payment module, SPI, handles real-time domestic transfers.

No CLS. The guaraní is not a CLS currency. 

Uruguay

Dollar accounts. Uruguay's banking system permits dollar-denominated deposit and lending accounts. Payments into the country may not require conversion if the beneficiary holds a dollar account, which is common for larger commercial entities.

De-dollarization. The BCU is actively working to shift activity toward the peso, and has adjusted reserve requirements to favor peso-denominated deposits. It has proposed requiring banks to warn depositors that dollar accounts may be subject to currency-mismatch risk. Despite this push, dollars are still considered important to hedge against sector-specific shocks such as drought.

No CLS. The peso is not a CLS currency. 

Payment-system modernization. Uruguay's electronic-transfer volumes are substantial (over 100 million transactions a semester), but full 24/7 instant payments, comparable to Brazil's PIX or Colombia's Bre-B, have not yet been achieved. 

Who regulates this corridor

BCP (Banco Central del Paraguay) sets monetary policy and runs the country's payment infrastructure, including SIP. Banking supervision sits inside the BCP through the Superintendencia de Bancos, one of three specialized superintendencies (alongside insurance and securities).

BCU (Banco Central del Uruguay) sets monetary policy. Its Superintendencia de Servicios Financieros (SSF) supervises the financial system on the BCU's behalf, with day-to-day technical autonomy, though the BCU's own board retains authority to override its decisions on certain matters.

Anatomy of a USD payment

1. Fund the source leg

The US company's bank debits its dollar account.

2. Carry the instruction

The bank dispatches a pacs.008 message over SWIFT to its correspondent, identifying the beneficiary, the amount, and the fee-bearing code (typically SHAR).

3. Convert the currency

For Paraguay, USD/PYG is a direct pair in a free-floating market, spreads on institutional trades can run upwards of 18bps.

For Uruguay, the same conversion applies if the beneficiary holds a peso account. But if the beneficiary holds a dollar account, which is common for larger commercial entities, there's no conversion at all.

4. Source the destination liquidity

The correspondent pays out from its prefunded position in the required currency. Both markets are thin relative to the region's larger economies, so very large tickets can take more coordination than in Mexico, Brazil, or Chile.

5. Clear compliance

The originating bank screens the payment; the US correspondent runs the OFAC check. The local correspondent runs BCP/Superintendencia de Bancos compliance (Paraguay) or BCU/Superintendencia de Servicios Financieros compliance (Uruguay).

6. Reach settlement finality

Both legs settle independently through correspondent banking. T+1 to T+2, or same-day if the Uruguayan leg settles directly into a dollar account.

7. Pay out on the local rail

SIP credits the beneficiary in Paraguay. In Uruguay it is an ordinary electronic transfer in pesos or dollars. 

Net. Cost is the spread (where conversion applies) plus correspondent fees.Spot convention is T+2; commercial payments can settle T+1, or same-day for a Uruguayan dollar-account payment.

When the pair is not USD

Almost no direct FX market exists between most Latin American currency pairs, but Paraguay and Uruguay are partial exceptions through the SML (Sistema de Pagos en Moneda Local), which allows for settlement in local currency for members. 

Paraguay has run an SML link with Brazil since August 2018; Uruguay has run one with Argentina since 2017. For corridors involving USD, this changes nothing. But for intra-regional trade, SML allows these countries to side-step the USD leg common elsewhere.