How did the Delian League organize contributions of ships and money from member states?

The Delian League organized contributions by inviting member states to provide either ships or money to support the collective defense against Persia. The responsibility for assessing which states would provide ships and which would pay tribute was entrusted to the Athenian statesman Aristides.12

Financial contributions were managed by ten Athenian officials known as hellēnotamiai, who were elected annually to oversee the funds. Originally, these contributions were stored at Delos, which served as the league's headquarters and the site for annual meetings where representatives of all member states held an equal vote. However, in 454 BCE, the treasury was transferred to Athens, a move that increased Athenian control and caused resentment among the allies. While the league's founding was marked by solemn oaths and a shared goal of liberation, the Athenians ultimately held the authority to decide contribution requirements and supplied the commanders in chief for the confederate fleet.132