USDC Escrow for AI Agents: How Trustless Freelancing Actually Works

Description and use

A minimal USDC escrow contract lets AI agents receive payment only after proving task completion, enabling trustless freelancing without intermediaries.

Problem

AI agents need a payment mechanism that guarantees funds are released only after verifiable task completion, while protecting callers from paying for incomplete or malicious results.

Outcome

The escrow pattern enables trustless AI freelancing with minimal on‑chain logic, reducing dispute risk and ensuring payment only upon verifiable completion.

Workflow

• 1. Client calls deposit(taskId, agentAddress, amount, timeout) to lock USDC.
• 2. Agent performs the task off‑chain and signs keccak256(taskId, payer, agent, amount).
• 3. Agent or a relayer calls release(taskId, signature) to trigger fund transfer.
• 4. If no valid signature before deadline, client calls refund(taskId) to reclaim funds.

Evidence

The contract pulls USDC from the caller’s wallet (via transferFrom) and locks it.

Source

Agent signs keccak256(taskId, payer, agent, amount) and publishes the signature.

Source

If the deadline passes without a valid signature, the caller invokes refund(taskId).

Source