Show HN: Kairos – Open-source risk and fraud decisioning platform
Summary
Kairos is an open-source real-time fraud and risk decisioning platform that decides actions (approve, step up, review, or block) for sign-ups, logins, orders, and payouts while preserving the signals behind each decision. It emphasizes agent-driven experiments using Claude Code, Cursor, or Codex via MCP, combines decision models (Grayson) with traditional ML, and supports self-hosting and SDKs for TypeScript and Python. The project positions itself as an open-source alternative to commercial fraud platforms with flexible workflows, evaluation, and self-hosting options for developers and teams.