You might be getting a VISA card:

"Starting the week of May 18th, approximately 4 million eligible recipients of Economic Impact Payments (EIP) will receive an EIP Card in the mail. The EIP Card is a Treasury-sponsored, VISA-branded, prepaid debit card that provides a safe, convenient and secure way for EIP recipients to access their Economic Impact Payments without having to go to a bank or credit union to cash a check."

https://www.consumerfinance.gov/coronavirus/managing-your-finances/economic-impact-payment-prepaid-d...