Hey Product Hunt! 👋 I built LEMON cake because I kept running into the same frustrating problem: I was building AI agents that needed to call paid APIs, but every time they did, someone had to manually approve and pay. The autonomy I wanted from my agents was constantly blocked by payment friction. The idea is simple — give each agent a scoped "wallet." A Pay Token is a JWT that carries a USDC spending limit, a specific service it can access, and an expiry. The agent attaches it like any Bearer token, our proxy verifies, charges, and forwards. No human in the loop. What surprised me most during building: accounting was the hidden pain. Every API charge is a real business expense, but there was no way to get it into QuickBooks or freee automatically. So I built per-buyer OAuth connections to 5 accounting platforms — now every charge creates a journal entry in the buyer's own books. I'd love to hear from anyone building AI agents, especially around how you currently handle tool payments and expense tracking. Brutal feedback welcome 🍋 → https://lemoncake.xyz

agent-payment-mcp

Give AI agents a budget. Let them spend it autonomously.

Give AI agents a budget. Let them spend it autonomously.