Circle

Agent Stack

Programmable USDC wallets with spending policies and service discovery.

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At a glance

Consider for: Agents paying for services with scoped USDC budgets.
Integration: CLI and developer tools
Payment protocols: x402
Spending controls: Global limits, per-service caps, allowlists, and time-bounded sessions.

COMPARE THE DETAILS

Costs, control & compatibility

Provider-reported facts, checked 2026-10-26. “Partial review” identifies an incomplete check; “Not confirmed” does not mean unsupported.

NetworksPartial review: Arbitrum, Avalanche, Base, Ethereum, Monad, Optimism, Polygon PoS, Unichain; Arc status needs confirmation.
Key control: User-controlled wallet with 2-of-2 MPC; key shares are not exposed to the agent.
Pricing: Gas sponsored within caps; swap fee 2 bps, crosschain x402 fee 0.5 bps. Bridging has additional fees.
Permissions: Time-bound USDC caps, recipient allowlists, and contract blocklists.
Developer access: Circle CLI; works across agent frameworks.
Testing: Mainnet and testnet identifiers are listed in the network documentation.

Before you integrate

The network docs list Arc mainnet, while the Agent Stack product FAQ says mainnet is coming soon. Confirm the current chain list in the CLI. Gas sponsorship is capped and can change.

Official resources

Agent Wallets documentation Networks & testnets Fee breakdown Agent Stack product FAQ

Before you choose

Use the provider’s documentation to answer these questions for your application.

Who controls the keys, and how can access be revoked?
Which spending limits apply to your chosen integration?
What are the total fees, including funding and network costs?
Can you try the complete flow in a test environment?