We built Lexiso because I kept running into the same question: when AI agents start making purchases, who decides what they're allowed to spend?

Today, if you're building an AI agent that buys things (shopping assistant, procurement bot, subscription manager), you either:

- Give it your card and hope for the best - Build custom authorization logic yourself - Don't let it spend money at all

None of these scale.

Lexiso is the missing layer. It's an API that sits between your agent and any payment system:

1. Register your agent 2. Define policies (amount limits, merchant restrictions, time windows) 3. Call /authorize before any purchase 4. Get a signed yes/no decision in <300ms 5. Full audit trail for compliance

The response is cryptographically signed, so you can prove later exactly what was authorized and why.

Site: https://lexiso.app Live API: https://api.lexiso.app Docs: https://lexiso.app/docs npm: npm install lexiso

Looking for feedback from anyone building agents that touch financial workflows. What's broken? What's missing? Would you use this?

Technical details: - Go backend, PostgreSQL - RSA-2048 signatures on all decisions - Designed for AP2 compliance (Google's agent payments protocol) - No custody, no money movement – authorization only