<p>This study examines the relevance of financial technology (FinTech) and green finance on sustainable development in Sub-Saharan African (SSA) economies from 2000 to 2022, using the Augmented Mean Group panel data model. The findings reveal that: (i) FinTech, when moderated by foreign direct investment (FDI) and financial development (FD), has a net positive impact on sustainable development across “economic, social, and environmental” dimensions; though the net effect on sustainability is not significant. (ii) Green finance, similarly moderated, shows an insignificant effect on sustainability, driven primarily by a positive net effect on economic sustainability, though it is partially offset by weaker social and environmental outcomes. (iii) However, when FinTech and Green Finance are applied together, their combined effects may conflict, leading to diminished benefits for the environment and overall sustainability. This suggests that FinTech and green finance are substitutive mechanisms when integrated into FDI and FD policies. The study concludes with policy recommendations emphasizing the need for independent and targeted frameworks to maximize the benefits of these financial innovations while addressing sustainability goals.</p>