🛡️Kairos Cloud Open-Sources Real-Time Fraud Decisioning as Sardine and Sift Alternative
Your fraud stack just got an open-source alternative
TL;DR
Kairos Cloud is an open-source platform that decides every sign-up, login, order, payment, and payout in real time. It's pitched as a self-hostable alternative to Sardine, Sift, Riskified, and SEON, with a coding agent that tunes the rules for you.
Kairos Cloud just dropped as an open-source fraud and risk decisioning platform, and it wants to replace the paid tools you're probably renting. It scores every sign-up, login, order, payment, and payout as it happens, then returns approve, step up, review, or block with a risk score and reasons attached. If you own fraud checks in a checkout or onboarding flow, this is worth a look. The bigger hook is the agent-first MCP server, which plugs into Claude Code, Cursor, or Codex. The agent reads your past decisions, builds workflows, and records every action under its own key, so you can audit what it changed. Setup is concrete. Self-hosting needs Docker, Node.js 22, pnpm 10, and a Grayson API key, and the server spins up its own Postgres. The TypeScript and Python SDKs ship alongside a CLI and HTTP API, and the repo includes the server, tests, and an evaluation suite under packages/eval.
Key Points
Kairos self-hosts with Docker and needs Node.js 22, pnpm 10, and a Grayson API key, and the server starts its own Postgres database automatically.
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