In this paper, we examine the relationship between alternative finance and board structure on the cost of debt for firms, focusing on the unique effects of differing board characteristics. Using a dataset of 176 European listed companies observed annually from 2013 to 2022, we dissect this relationship through several hypotheses considering factors such as the supply of alternative finance, board gender composition, age, expertise, and board turnover. Our findings reveal that increased alternative finance credit supply escalates the cost of debt, especially for firms with lower ESG scores. Firms with young boards, boards specialized in economics or low, and board turnover also experience a rise in borrowing costs with increasing of alternative finance. Through a pooling 2SLS model, we provide robust evidence about the interplay of alternative finance and varying board structures on the cost of debt. This research clarifies the intricacies of bank-firm relationships in alternative finance and holds significant implications for supervisory authorities, banks, and policymakers. It underscores the necessity of good corporate governance in managing the cost implications of alternative finance. It calls for tailored risk assessment strategies, conducive regulatory frameworks, and vigilant supervisory approaches to create a resilient financial ecosystem where alternative finance can thrive without inordinately inflating the cost of debt.