Affirm

Affirm is a pioneer in the 'Buy Now, Pay Later' (BNPL) space, leveraging a sophisticated AI-driven underwriting engine to provide instant credit decisions without impacting consumer credit scores in most scenarios. As of 2026, Affirm has evolved into a comprehensive financial technology platform that integrates deeply with merchant stacks via robust APIs. Its technical architecture centers on the 'Adaptive Checkout' system, which utilizes machine learning models to analyze thousands of data points in milliseconds to offer personalized payment terms (ranging from 0% APR to 36% APR). For developers and enterprise architects, Affirm provides a highly scalable RESTful API that handles transaction orchestration, refund logic, and settlement reconciliation. Its market position is solidified by its transparency—rejecting compound interest and late fees in favor of a fixed-fee model. The platform’s 2026 roadmap emphasizes AI-powered fraud detection (Affirm Fraud Shield) and the expansion of the Affirm Card, creating a bridge between digital-first financing and physical point-of-sale environments. This architectural robustness ensures high conversion rates for merchants while maintaining a low-risk profile through predictive behavioral analytics.