Basis Theory raised $33 million in Series B funding led by Costanoa Ventures to build payment infrastructure for agentic commerce—where AI agents conduct transactions autonomously on behalf of users and businesses.

The funding addresses a critical infrastructure bottleneck as AI agents evolve from assistants to autonomous buyers. Traditional payment systems lock merchants into rigid platforms and fragment sensitive transaction data across multiple processors, creating compliance headaches and limiting how businesses can leverage payment intelligence for automation and growth.