Top Artificial Intelligence Startups in California, US

PayOS is a next-generation card-based payments and billing platform powering agent-driven commerce. The platform enables agents to securely vault cards, streamline checkouts, send and receive payments, and manage billing—all through a unified, compliant system. With PayOS wallets, users link their card once for seamless payments across agent-driven workflows. Processor-agnostic by design, PayOS offers businesses secure, flexible integration with their preferred payment processors. By integrating agentic events, billing, and charging users, the platform enables agents to monetize users effectively. payos.ai/blog/payos-launch

FairwAI is building real-time accountability infrastructure to detect bias in the moments that matter most. We’re solving one of the toughest challenges in tech: how to make fairness not just a principle but a system. From healthcare and hiring to hospitality and housing, bias shows up when people are most vulnerable. FairwAI turns those moments into measurable, actionable data—using AI, computer vision, and behavioral science to flag risks and enable institutional change before harm happens. We’re not a DEI tool. We’re compliance infrastructure for a new era—where safety, dignity, and fairness are non-negotiable. Our team includes engineers, policy thinkers, civil rights advocates, and public interest technologists from MIT, Harvard, Stanford, The UN, and beyond. We’re launching high-impact projects and building the backbone of ethical AI adoption across sectors. For interns & fellows, this is not a coffee-run experience. You’ll co-design tools, analyze live scenarios, and help shape the future of bias detection and remediation. Your work will be mentored, respected, and turned into real-world impact. If you care about fairness, ethics, and building tools that actually change lives—FairwAI is where your skills meet purpose. Join us. Let’s build the infrastructure fairness deserves.

Driving smarter hospital operations with trusted AI. RxGPT automates patient routing, admin work, and communication—freeing healthcare teams to focus on what matters most: quality care. Fast onboarding. Seamless integration. Always secure.

empowers beauty and lifestyle SMBs with AI-driven intelligence to streamline bookings

Garage Stories helps tech companies and startups develop their VR/AR/AI products by launching "challenges" to our worldwide community of creators.

We are an applied AI research lab looking to create general powerful AI agents that automate enterprise workflows. We are primarily focused on the insurance revenue cycle management vertical, where we try to use AI to overturn insurance denials.