Is it still worth bringing dollars for Argentina's blue rate?

Not as it used to be. In our reading on 11 September 2026 the blue stood at 1,540 against 1,535 official, a gap of 0.3%, and over the previous two weeks it ran between 0.3% and 1.6%. At that scale the gain does not cover the risk of carrying cash or the spread on two exchanges.

Are Brazilian reais accepted in Ciudad del Este?

Yes, in almost every shop, in cash, and more and more businesses accept Pix. On larger purchases, paying in reais or dollars usually works out better than converting to guaraníes on the spot.

And in Puerto Iguazú?

Many tourist businesses accept reais, but the rate applied varies from shop to shop. For taxis, buses and small shops, Argentine pesos are more practical.

Where should you avoid changing money at the border?

The airport, where rates are consistently worse. Prefer the exchange offices at the bridge heads or in central Ciudad del Este, comparing first, because rates move through the day.

Changing money at the border: what changed with the blue dollar

Where to change money at the border, and where reais are accepted

The old advice about bringing dollars for Argentina's blue rate has stopped paying off, and we can show it

For years the rule was to bring cash dollars for Argentina's parallel rate. We track that gap daily, and it has all but disappeared. That changes what is worth doing.

Where to change money at the border, and where reais are accepted

Foto: Valentin Ivantsov / Pexels

Direct answer: In Ciudad del Este the Brazilian real is accepted in almost every shop, and Pix is spreading fast. In Puerto Iguazú many tourist businesses take reais, but pesos are more practical for taxis and small shops. And note what changed: Argentina's blue dollar is no longer a good deal. In our reading on 11 September 2026, the blue stood at 1,540 against 1,535 official, a gap of 0.3%.

What changed: the blue gap is now tiny

For many years the advice was the same: bring cash dollars and change them on the parallel market, because the gap against the official rate paid for the trip.

We track that gap daily. Over the past two weeks it has run between 0.3% and 1.6%:

Date	Blue	Official	Gap
11/09/2026	1,540	1,535	0.3%
08/09/2026	1,545	1,530	1.0%
04/09/2026	1,540	1,530	0.7%
31/08/2026	1,555	1,530	1.6%

At that scale, carrying cash dollars purely to catch the parallel rate has stopped paying off: the gain does not cover the risk of carrying cash or the spread on two exchanges.

This could shift again, which is why the measurement stays live: see the live exchange rates.

Where reais are accepted

Ciudad del Este (Paraguay): almost every shop takes cash reais, and more and more accept Pix. On larger purchases, paying in reais or dollars usually works out better than converting to guaraníes on the spot.
Puerto Iguazú (Argentina): many tourist businesses accept reais, but the rate applied varies from shop to shop. For taxis, buses and small shops, pesos are more practical.

The cost nobody shows you: the spread

Exchange offices do not charge a visible fee. They earn on the gap between what they pay for your currency and what they charge to sell it.

In the reading on 11 September 2026 at an exchange house in Ciudad del Este, the real was bought at 1,140 and sold at 1,165 guaraníes. The gap between the two sides is around 2.2%, and that is the real cost of the transaction. The Argentine peso showed at 3.65 buy and 3.85 sell.

Hence the practical rule: change once, for the right amount. Every round trip through a currency eats that spread again.

Where to change

Exchange offices at the bridge heads, on both sides. Compare: rates move through the day.
In central Ciudad del Este, exchange houses usually offer a better guaraní rate than those at the bridge.
Avoid the airport, where rates are consistently worse.

Cash, card or Pix

Method	When it works	Watch out
Cash (reais or dollars)	Large purchases in CDE, where you can haggle	The exchange spread and the risk of carrying cash
International card	Established shops and restaurants	Check the rate your bank applies
Multi-currency account	General use, usually a better rate than a card	Must be set up before the trip
Pix	Increasingly accepted in Paraguay	You pay in reais and the merchant receives guaraníes

Before crossing, check the live bridge queue.

Sources: Marco Três's own exchange-rate series (dollar, guaraní, peso and Argentina's blue dollar) · counter rates from an exchange house in Ciudad del Este · verified 11/09/2026.

Is it still worth bringing dollars for Argentina's blue rate?: Not as it used to be. In our reading on 11 September 2026 the blue stood at 1,540 against 1,535 official, a gap of 0.3%, and over the previous two weeks it ran between 0.3% and 1.6%. At that scale the gain does not cover the risk of carrying cash or the spread on two exchanges.
Are Brazilian reais accepted in Ciudad del Este?: Yes, in almost every shop, in cash, and more and more businesses accept Pix. On larger purchases, paying in reais or dollars usually works out better than converting to guaraníes on the spot.
And in Puerto Iguazú?: Many tourist businesses accept reais, but the rate applied varies from shop to shop. For taxis, buses and small shops, Argentine pesos are more practical.
What does changing money at an exchange house cost?: The cost is in the spread, the gap between the buy and sell rates. In the reading on 11 September 2026 at an exchange house in Ciudad del Este, the real was bought at 1,140 and sold at 1,165 guaraníes, a gap of around 2.2%. That is why it pays to change once, for the right amount.
Where should you avoid changing money at the border?: The airport, where rates are consistently worse. Prefer the exchange offices at the bridge heads or in central Ciudad del Este, comparing first, because rates move through the day.

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