Amidst the global ascent of financial technologies (FinTech), Argentina presents a critical case for examining how these platforms shape debt relations among marginalized households. Employing a mixed-methods approach, this article draws on quantitative data from the Central Bank of the Republic of Argentina and the National Institute of Statistics and Censuses, alongside qualitative findings from a case study conducted in Buenos Aires’ largest slum. The article conceptualizes FinTech as an integral part of the lower tiers of the credit market, functioning as a mechanism for extending debt. The findings reveal that FinTech platforms do not displace existing credit sources but instead operate alongside them, providing new channels for debt that deepen financial dependence. FinTech’s role in marginalized communities, therefore, is less about banking the unbanked and more about reconfiguring access to unsecured debt, allowing for immediate consumption amidst financial instability. The article in this way contributes to the literature on FinTech by offering an understanding of FinTech’s embeddedness in everyday financial practices, showing how marginalized users engage with FinTech as a tactical response to their socio-economic conditions, exercising agency within constrained circumstances shaped by debt and financial precarity.