Visa says they process "150 million transactions every day in 175 currencies" (see page 3 at https://usa.visa.com/dam/VCOM/download/corporate/media/visan...). That's ~1,800 per second. Mastercard is smaller, so this would be the upper limit for them. Both combined should still fit into "a few thousand transactions per second".
Visa says they process "150 million transactions every day in 175 currencies" (see page 3 at https://usa.visa.com/dam/VCOM/download/corporate/media/visan...). That's ~1,800 per second. Mastercard is smaller, so this would be the upper limit for them. Both combined should still fit into "a few thousand transactions per second".