Sign up for Circle Agent Stack access (announced May 11, 2026) via the Circle Developer Portal; the stack includes Agent Wallets, Nanopayments via Circle Gateway, Circle CLI, and the Agent Marketplace.
Create an Agent Wallet through the Circle CLI (circle wallet create --agent) or the programmable wallets API; set policy controls specifying maximum spend per session and allowed recipient addresses.
Enable Nanopayments on the wallet: Nanopayments are Circle Gateway-powered gas-free USDC transfers supporting amounts as small as $0.000001, designed for high-frequency sub-cent machine-to-machine flows.
To send a nanopayment, call circle.nanopayments.send({ from: agentWalletId, to: recipientAddress, amount: '0.000001', currency: 'USDC' }); the transfer settles at machine speed without requiring on-chain gas.
Browse the Circle Agent Marketplace to discover x402 or nanopayment-capable services your agent can pay programmatically; the marketplace lists services with their pricing, accepted payment types, and integration endpoints.
Known gotchas
Circle Agent Stack was announced alongside Circle's Q1 2026 earnings on May 11, 2026 and is a new product; some features (particularly Agent Marketplace discovery and Circle Skills) may be in limited access — verify availability before building production flows.
Nanopayments are distinct from standard Circle Programmable Wallet transfers; they use a separate Circle Gateway protocol and endpoint — do not route Nanopayment calls through the standard Payments API.
Agent Wallet policy controls are set at creation time and cannot be changed retroactively via API in the current SDK version; plan your spend caps carefully before provisioning production wallets.
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp