Stripe Radar

Stripe Radar is an AI-powered fraud detection service built directly into the Stripe payments platform. Developed and maintained by Stripe, it is designed for online businesses of any size that process card payments through Stripe and need to reduce fraudulent transactions without building their own fraud tooling from scratch. Because it runs inside the payment flow, there is no separate integration required beyond having an active Stripe account.

How Stripe Radar works

Radar applies machine learning models trained on signals from billions of transactions processed across the global Stripe network. Every payment that comes through is assigned a fraud risk score before it settles. Merchants can act on that score through built-in Adaptive Models that adjust to their specific transaction patterns over time, and through Custom Rules that let teams define their own block or review logic based on factors like card country, email domain, or purchase amount. For higher-risk transactions, Radar can trigger 3D Secure authentication automatically, shifting liability to the card issuer. Businesses on eligible Stripe plans can also enroll in Chargeback Protection, which covers the disputed amount and the dispute fee on qualifying transactions Radar allowed through.

Strengths

• No separate integration: fraud scoring activates automatically for Stripe users with no SDK to install or webhook to wire up.
• Network-scale signals: the ML models draw on cross-merchant transaction data, giving even new or low-volume merchants access to patterns that would take years to build independently.
• Granular custom rules: merchants can write fine-grained allow/block/review rules without writing code, using Radar’s rule builder in the Stripe dashboard.
• Chargeback Protection removes the financial uncertainty of disputes on covered transactions, simplifying loss accounting.
• Transparent per-screen pricing at $0.05 per screened transaction keeps costs predictable and directly tied to volume.

Limitations

• Radar only works if you process payments through Stripe. Businesses using a different payment processor or a multi-processor setup cannot use it for those payment flows.
• The $0.05 per-screen fee adds up at high volumes. A merchant processing 500,000 transactions per month would pay $25,000 per month in screening fees alone, which may exceed the cost of standalone fraud platforms at that scale.
• Custom rules require careful calibration. Overly aggressive rules can block legitimate customers, and the dashboard does not provide a built-in A/B testing framework for evaluating rule changes before they go live.
• Chargeback Protection has eligibility criteria and does not cover all dispute categories, so merchants should read the terms rather than treating it as blanket chargeback insurance.
• Businesses with unusual or niche product categories may find the shared network models less accurate for their specific fraud patterns and will need to lean more heavily on custom rules to compensate.

Who it is for

Stripe Radar is a strong fit for e-commerce businesses, SaaS companies, and marketplaces that already process payments on Stripe and want fraud protection without the overhead of evaluating and integrating a third-party fraud vendor. It suits teams that prefer to manage risk inside a single dashboard rather than routing data between separate systems. Businesses with a dedicated risk or payments operations team will get the most value from the custom rules engine and adaptive model tuning. Very high-volume merchants should model the per-transaction cost against standalone alternatives before committing.

How it compares

Stripe Radar sits in a different category from consumer finance tools. If you are a user looking for tools that help you manage personal financial health rather than business payment risk, Credit Karma is more relevant: it focuses on free credit monitoring, credit score tracking, and personalized financial product recommendations for individuals rather than transaction-level fraud scoring for merchants.

For businesses operating in the crypto space, Coinbase offers its own built-in account security and fraud controls, but those are specific to the Coinbase platform and digital asset transactions rather than general card payment fraud detection. Stripe Radar and Coinbase’s controls serve fundamentally different payment rails and should be evaluated separately based on where your revenue actually flows.