World Liberty Financial (WLFI) shipped the AgentPay SDK on March 19 — an open-source, self-custodial toolkit that gives AI agents the ability to hold, transfer, and settle payments using the USD1 stablecoin across EVM-compatible chains.

What it does

The SDK wraps four layers: a CLI (agentpay), a local signing daemon, a policy engine, and a skill pack that installs automatically into popular AI coding tools including Claude Code, Codex, Cursor, and OpenClaw. Private keys never leave the local machine — signing happens via Unix domain sockets, with zero data sent to WLFI.

Transactions flow through a structured pipeline: balance check → policy evaluation → local signing → broadcast. Routine transfers under a user-defined threshold run automatically; larger transfers pause and wait for human approval.

USD1 as agent-native money

USD1 comes pre-configured on Ethereum mainnet and BSC. With a current market cap of approximately $4.5 billion, it is the fifth-largest stablecoin by market cap. WLFI is positioning USD1 not just as a dollar-pegged asset but as a settlement layer purpose-built for non-human transactors — designed to function inside agentic workflows rather than alongside them.

The SDK ships with 40+ CLI commands, a Bitrefill integration for purchasing gift cards and eSIMs, and plans for EIP-3009 gasless meta-transactions that would let agents operate without holding native gas tokens.

Context

The release arrives as the industry broadly debates what payment infrastructure AI agents should use. WLFI is betting the answer is programmable, policy-aware stablecoin rails rather than credit cards, OAuth flows, or per-transaction approvals wired through centralized services.

The SDK and docs are available at agentpay.worldlibertyfinancial.com.