Bank adoption of external application programming interfaces (APIs) enables bank customers to share their data more efficiently and securely with other third-party financial institutions and FinTechs, thus enabling open banking and bank data portability. Analyzing determinants of API adoption by U.S. banks from 2007 to 2022, we show that banks that adopt APIs tend to be larger and face lower competitive pressures. The announcement of President Biden’s executive order in July 2021 encouraged increased bank data portability and led to an acceleration in bank API adoption. Banks that adopt APIs experience an increase in Return on Assets ( ROA ) and Tobin’s Q and a decrease in loan loss provisions, particularly after President Biden’s executive order. We find that APIs’ ability to facilitate data access and sharing improves bank information flows and supports banks’ loan and deposit services which form the foundation of notable improvements in bank performance. Overall, our results on the determinants and implications of API adoption have important policy implications for the discussion on open banking regulation and bank data portability.

We assess small banks' responses to announcements of state-level proposals of Privacy Protection Acts (PPAs). Employing a Difference-in-Differences framework, we uncover the proactive actions taken by U.S. small banks in anticipation of these proposals. Our findings reveal that the announcement of PPA proposals leads to a 35.46% increase in IT investment by U.S. small banks, primarily driven by market pressure, with regulatory pressure playing a more limited role. Particularly, evidence suggests that banks with greater competitive threats from their rivals are motivated to enhance their IT investments due to market pressures. However, our research also finds that this surge in IT investment does not immediately translate into benefits for small banks.