USDC Escrow for AI Agents: How Trustless Freelancing Actually Works

Description and use

A minimal escrow pattern on Base with USDC lets autonomous AI agents lock, verify, and release funds without a central escrow, using off‑chain ECDSA signatures.

Problem

Autonomous AI agents need a trustless, low‑cost way to pay external services without a central escrow provider.

Outcome

A production‑ready escrow pattern that lets AI agents lock USDC on Base, release funds via off‑chain ECDSA signatures, and refund after a timeout, all with minimal gas and no central authority.

Workflow

• Deploy UScEscrow contract with payer, payee, amount, and deadline
• Payer approves contract to spend USDC
• Payer calls fund() to lock USDC
• Service performs work and publishes a release nonce
• Payer signs release message off‑chain and sends signature to service
• Service or relayer calls release(nonce, v, r, s) on contract
• If deadline passes without release, payer calls refund() to reclaim funds

Evidence

The contract pulls the exact amount from payer’s USDC allowance.

Source

After the service is performed, the payee (or any relayer) presents an ECDSA signature signed by the payer over a structured message that includes amount, payee, and a nonce.

Source