Lifeline
AI agents pay x402 paywalls on credit. A World ID-verified human owes the debt.
Demo
About
Lifeline is a credit line for AI agents. More and more agents pay for APIs and data themselves through x402 paywalls, but when their wallet runs dry they just stop, and nobody will lend money to a piece of software. With Lifeline, a person verifies once with World ID and gets a credit line. Their agents can spend on it. When an agent can't afford something, Lifeline pays the seller and the debt goes to the human, not the agent. Repay on time and your limit grows. There are two separate credit lines, one on Arc and one on Sui. Every payment is checked by Intercepta before it's sent: known scammers and fake tokens are blocked, and anything unusual waits for the human to approve it with World ID. Debts can be repaid in crypto or by Apple Pay, Google Pay or card. Lifeline works on the web, as a World mini app, and inside Claude Code.
How it's made
World: the human joins with World IDKit and signs in later with World ID sessions. World ID for Agents is how they approve payments their agents couldn't make on their own. Sui: the credit logic is a Move smart contract that lends Circle's testnet USDC. Before borrowing, an agent commits to a repayment date. On that date the debt is paid from what it has earned, or it's recorded as a default for anyone to see. Intercepta: its API checks the seller, the token and the payment itself before anything is signed. Card repayments: these go through Stripe. Claude Code: an MCP server lets a Claude Code session ask the human for access with one link, then pay on its own.