It costs up to ~$9m per year, processing 63 billion transactions per year: https://oglobo.globo.com/economia/noticia/2024/10/03/bc-gasta-ate-r-50-milhoes-ao-ano

It costs up to ~$9m per year, processing 63 billion transactions per year: https://oglobo.globo.com/economia/noticia/2024/10/03/bc-gasta-ate-r-50-milhoes-ao-ano-para-manter-sistema-do-pix-diz-campos-neto.ghtml https://oglobo.globo.com/economia/noticia/2024/10/03/bc-gast... Banks pay a small fee (less than a cent) per batch of transactions.