Every agent project I built had the same problem — someone had to manually handle the money. So I fixed it. ETH, USDC, Stripe card, and ACH in one SDK. Non-custodial on every rail — funds go directly between agents, we never hold them. Auto-billing means agents settle automatically, no human approvals. TypeScript SDK, Solana, BTC Lightning coming next. Works today. Not a protocol spec. pip install agent-payment-sdk