Circle launches Agent Stack to make USDC the default currency for AI agents

Circle just built a financial system where the customers aren’t human. The stablecoin issuer launched its Circle Agent Stack on May 11, a suite of tools that lets autonomous AI agents hold assets, discover services, and settle payments using USDC, all without a person clicking “confirm.”

What the Agent Stack actually does

The stack has four main components, each solving a different piece of the autonomous-finance puzzle.

First, there’s the Circle CLI, a command-line interface that gives developers (and eventually agents themselves) a way to interact with Circle’s infrastructure programmatically.

Second, Agent Wallets provide each AI agent with its own USDC-holding account. These wallets come with programmable guardrails, meaning developers can set spending policies, transaction limits, and approval rules before letting an agent loose.

Third, an Agent Marketplace acts as a discovery layer where agents can find services offered by other agents. If one AI needs data cleaning and another AI offers it, the marketplace handles matchmaking while USDC handles settlement.

Fourth, Nanopayments. These are near-instant, gas-free transactions processed through Circle Gateway that can be as small as $0.000001. Six decimal places of a dollar.

The ARC token and a new Layer-1

Circle also announced a successful presale of its ARC token, raising $222 million at a $3 billion valuation.

The ARC token powers Circle’s new Arc blockchain, described as a stablecoin-native Layer-1. Transaction fees on Arc are denominated in USDC rather than a volatile native token, removing the friction of users having to hold one asset to pay fees while transacting in another.

CEO Jeremy Allaire has framed AI agents not as tools that assist human customers but as customers themselves. The Agent Stack makes that framing concrete, with Circle treating software entities as first-class economic participants, complete with wallets, spending rules, and marketplace access.

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