How to Revoke an AI Agent’s Access to Native USDC

Operators can revoke an AI agent’s native USDC access after deployment by performing three coordinated actions: change the live transfer policy, end the agent session or revoke onchain spend permissions, and rotate or destroy the signing credential. The procedure is a post-deployment cut-off and does not refund USDC that has already settled onchain.

The three steps act on different capabilities. Tightening or replacing the live transfer policy blocks new outbound transfers above the new cap or to blocked recipients but does not invalidate payloads the agent already signed. Ending a session or revoking a spend permission prevents the agent from producing the next signature but does not stop a credential that can mint a new session. Rotating or destroying the signing credential prevents the creation of future sessions or API access but does not remove any sessions or keys left on hosts that remain logged in.

For Circle programmable wallets, operators must work from a human terminal and confirm a human session with circle wallet status before changing the live transfer limit or recipient allowlist. Circle requires a second one-time password (OTP) to confirm any wallet limit change; an agent that can read that OTP inbox can reauthenticate and regain access. Sessions last seven days and secrets can persist in an operating-system keychain, so operators should run circle wallet logout –type agent on every host that ran the CLI, including CI runners and the agent’s machine. Logout clears only local stored credentials; removing inbox access and sweeping any exposed private keys is required to stop reentry. Do not run circle wallet limit reset during an incident, because reset restores defaults and can reopen spending.

If the agent used Circle Gateway float for nanopayments, operators should withdraw the float with circle gateway withdraw on the same chain and cancel pending outbound transfers with circle transaction cancel before moving remaining native USDC. Drain the agent address to a human-controlled address using circle wallet transfer. If a recipient allowlist is enforced, add the treasury or recipient address under a human OTP and confirm that code without letting the agent access the inbox. Confirm the token is Circle-issued USDC by matching the contract address exactly; for example, Base native USDC is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.

On Coinbase CDP, spend permissions are onchain grants that must be revoked by permissionHash. List granted permissions with cdp.evm.listSpendPermissions and revoke each with cdp.evm.revokeSpendPermission using the Smart Account address, the permissionHash and the network. Wait until the contract’s list shows revoked: yes before proceeding. The Spend Permission Manager contract address for supported networks is 0xf85210B21cC50302F477BA56686d2019dC9b67Ad. After onchain revocation, rotate the CDP API key and the wallet secret, create a new API key, and remove old environment entries and wallet secrets with cdp env live –remove and cdp env live –remove-wallet-secret. Any host that still holds CDP_KEY_ID, CDP_KEY_SECRET or CDP_WALLET_SECRET can sign again.

Treat any x402-signed payload the agent already produced as active. x402 is an HTTP payment handshake in which the client signs first and a facilitator verifies and settles later. Cutting a session or revoking permissions does not invalidate already-signed x402 payloads; operators should not assume cancellation until the facilitator returns a terminal result.

Call the grant revoked only after every verification passes: no stored Circle session on any host, the OTP inbox is inaccessible to the agent, the live transfer policy shows the tightened rule (not a reset to defaults), all Coinbase spend permissions report revoked: yes, old CDP credentials and environment variables are removed, there are no pending outbound transfers, and native USDC balances and Gateway float have been moved to human-controlled addresses. Record the cut in logs with timestamp, principal, wallet address, permissionHash or session type, and which checks passed. Revoke is a technical cut-off and not a refund mechanism for USDC already settled onchain.