AgentPay SDK is now launching as an open-source toolkit designed for AI agents that handle funds. World Liberty Fi (WLFI) introduced the tool alongside its USD1 stablecoin, framing both as infrastructure for autonomous systems.
The toolkit enables developers to build agents capable of making payments, operating under programmable policy rules, and running on EVM-compatible networks. It runs entirely on the user’s machine and does not send any data to WLFI.
How AgentPay SDK Manages Payments on EVM Chains
AgentPay SDK handles payments through four functional layers. These layers include a command-line tool, a local signing daemon, a policy engine, and skill packages. Skill packages can automatically detect and install into Claude Code, Codex, Cursor, Windsurf, Cline, and Goose.
When an agent initiates a transfer, the skill package automatically routes it to the correct network. For USD1, the SDK defaults to Binance Smart Chain for low fees and fast confirmations. This routing follows pre-configured settings without requiring manual input from the developer.
Before broadcasting, the SDK checks if the wallet holds sufficient USD1 and BNB for transaction fees. Subsequently, the local policy engine evaluates the transfer against user-defined spending rules, checking per-transaction limits and daily caps before authorizing the payment.
Transaction signing occurs entirely on the local machine via Unix domain sockets. Private keys never touch the agent, skill package, or any external service. This architecture ensures operator control and guarantees that no credentials traverse the network.
When the wallet is underfunded, the SDK halts and returns a structured error response. It provides the wallet address, required assets, chain ID, and a QR code for topping up. The agent relays this information to the user, transforming a failed payment into a recoverable workflow.
Policy-Based Approvals and USD1 Roadmap
WLFI introduced the AgentPay SDK on X, calling it “the financial infrastructure for the agent economy.” The post noted that while AI systems excel at reasoning, they remain underpowered when it comes to handling funds. The SDK addresses this through local signing, policy enforcement, and native agent tool integration.
The AgentPay SDK includes a threshold-based approval layer for transactions exceeding defined limits. When a transfer surpasses a limit, the SDK pauses and generates a manual approval request. Operators can approve via a single CLI command, after which the transaction can be signed and broadcast.
USD1 is pre-configured on Ethereum and BSC with the contract address 0x8d0D000Ee44948FC98c9B98A4FA4921476f08B0d. Native integration with Bitrefill allows agents to purchase gift cards, eSIMs, and prepaid products. The SDK also includes over 40 CLI commands covering wallet management, chain switching, and account recovery.
The roadmap includes EIP-3009 for gasless meta-transactions, removing the need for agents to hold fee tokens. WLFI also plans to propose EIPs for policy implementation.