The best open source alternative to Feedzai is Ballerine. If that doesn't suit you, we've compiled a ranked list of other open source Feedzai alternatives to help you find a suitable replacement. Other interesting open source alternative to Feedzai is Marble.
Feedzai alternatives are mainly Fintech Infrastructure Tools but may also be Financial Risk Management Tools or Security & Privacy Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Feedzai.
Reduce fraud and speed underwriting with AI-driven risk intelligence for PSPs, banks, and fintechs.

Ballerine is an AI-native risk intelligence platform built for financial institutions, acquirers, and payment providers that need to underwrite and monitor merchants at scale in real time.
Instead of relying on fragmented point solutions, Ballerine unifies data from business registries, transaction patterns, sanctions lists, and web intelligence into one composable infrastructure.
Its AI Agents continuously analyze these signals to deliver dynamic and explainable risk assessments across the merchant lifecycle.
With a modular architecture, teams can automate underwriting, detect emerging risks, and monitor merchant behavior while aligning to their own policies and compliance frameworks.
Unlike traditional systems with static models, Ballerine's AI Agents learn and adapt from live data, uncovering changes in merchant behavior that indicate fraud, laundering, or non-compliance.
Key Benefits:
Top Acquirers, PSP, PayFacs, and ISOs choose Ballerine to:
Already deployed across multiple regions, Ballerine has enabled acquirers and fintechs to accelerate underwriting decisions, reduce manual reviews, and cut false positives, redefining how modern institutions manage merchant risk.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
An open-source platform that enables fintech companies to monitor transactions and user activity, detect suspicious behaviors, and automate fraud prevention in real-time.

Marble is a powerful open-source fraud and AML decision engine built specifically for fintech companies and financial institutions. The platform enables real-time monitoring of various events including transactions, logins, signups, and account changes.
Key benefits include:
As an open-source solution, Marble provides transparency, security, and community-driven development while helping companies scale their fraud prevention efforts effectively.