This study aims to evaluate the extent to which Sharia-based financial technology (fintech) services influence financial sustainability in Islamic banking institutions within Palopo City. The focus is on three key services: Sharia peer-to-peer lending, Sharia crowdfunding, and Sharia e-wallet. A quantitative approach was employed using purposive sampling, involving 50 employees from three selected Islamic banks. Data were collected via questionnaires and analyzed using SPSS version 25. The statistical analysis reveals that all three fintech services significantly impact sustainable finance. Sharia P2P Lending has a t-value of 3.015 (p = 0.004), Sharia Crowdfunding 2.032 (p = 0.048), and Sharia E-Wallet 2.850 (p = 0.007). Simultaneously, the variables influence sustainable finance with an F-value of 33.304 and a significance level of 0.001. These findings confirm that synergy between fintech and Islamic principles enhances operational efficiency, transparency, and inclusive financial access. The practical implication is that Islamic banks should maximize Sharia fintech to support transactions and financing in line with sustainability goals. Academically, this study contributes to the discourse on digital Islamic finance and can serve as a reference for policymakers aiming to strengthen the foundations of sustainable finance through Sharia-compliant technological innovation. This study also fills a gap in the literature by providing empirical insights at the local level, which is often overlooked in broader analyses. The results highlight the importance of local institutional readiness and literacy in determining the success of Sharia fintech adoption. Future research is encouraged to incorporate customer perspectives and expand geographically to improve generalizability
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