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Yes, now in Brazil you can hardly find anyone not using Pix. It is all digital and free. Even in Argentina and Paraguay, many local merchants are now accepting Pix.

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Is there anything preventing a merchant in e.g. the US from using Pix?

It's denominated in the Brazilian real rather than USD?

With BRICS, other currencies may be integrated.

China also have a pix-like wechat Russia has a pix-like "BRICS Pay"

And those systems can be integrated.

PIX QRCode protocol already have a "currency" field, that currently only support the constant value of "BRL"

USA probably will continue to use check and printed money like the ancients do.

Yeah, in Argentina the main digital wallet is MercadoPago. Many merchants have their terminal to accept payments with credit cards/QR, and since this past summer you have the option to accept payments with Pix too. Also it goes both ways, everyone going on vacation to Brazil can pay with MercadoPago without having to install Pix.

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