Amicus brief is pro bono

Master account is important for any bank.

A Federal Reserve master account is a record of financial rights and obligations between a financial institution and the Federal Reserve Bank. It is identified by a Primary nine-digit Routing Transit Number (RTN) and is used to settle transactions, manage reserves, and access various financial services provided by the Federal Reserve[2][3].

Sources [1] Master Account and Services Database - Federal Reserve Board https://www.federalreserve.gov/paymentsystems/master-account-and-services-database-about.htm [2] Master Account - FRBservices.org https://www.frbservices.org/financial-services/accounting/service-setup/master-account.html [3] Master Accounts and Services Database -- FAQs https://www.federalreserve.gov/paymentsystems/master-account-and-services-database-faq.htm [4] [PDF] Federal Reserve: Master Accounts and the Payment System https://crsreports.congress.gov/product/pdf/IN/IN12031 [5] Database: Existing Access - Federal Reserve Board https://www.federalreserve.gov/paymentsystems/master-account-and-services-database-existing-access.htm