Circle Unveils Agent Stack for AI-Native USDC Payments; Raises $222M for Arc Token at $3B FDV
Circle introduced Agent Stack, a new suite of developer tools designed to let AI agents hold funds, settle payments and buy services using USDC. The release includes agent-native wallets, a command-line interface, a marketplace for agentic services, and a nanopayments protocol that enables gas-free USDC transfers as small as $0.000001.
CEO Jeremy Allaire said the launch represents the company's first end-to-end product line where AI agents are the customers, not just human developers. The system uses programmable spending limits and policy guardrails aimed at enabling high-frequency machine-to-machine commerce across supported blockchain networks. Circle is positioning itself as a broader financial infrastructure provider rather than a single-product stablecoin issuer.
Circle also used the rollout to spotlight Arc, a new blockchain network pitched as a second growth engine tailored to institutional compliance requirements. Shares of the New York-listed parent rose more than 15% on Monday after executives marketed Arc as "institutionally ready" infrastructure for banks, asset managers and payment firms seeking trust-grade rails for global settlement.
The timing comes as U.S. lawmakers advance stablecoin legislation that could broaden issuance rights to banks and fintechs, intensifying debate over whether stablecoin issuance becomes commoditized as regulated competitors enter the market.
Circle disclosed a $222 million presale of Arc's native token, implying a fully diluted valuation of $3 billion and marking what it described as the first corporate token raise by a publicly listed company. Andreessen Horowitz led with a $75 million commitment, alongside BlackRock, Apollo Funds, Intercontinental Exchange, SBI Group, ARK Invest and Standard Chartered Ventures.
A total of 740 million tokens were sold at $0.30 each via a private placement exempt from U.S. securities registration. Arc's initial supply is 10 billion tokens: 60% allocated to ecosystem participants, 25% retained by Circle to run validator infrastructure, and 15% held in long-term reserve.
The Arc whitepaper, published Monday, describes a hybrid consensus model that starts with proof-of-authority before moving toward proof-of-stake. Arc uses USDC as its native gas token and targets sub-second finality. It also offers opt-in privacy via zero-knowledge proofs and trusted execution environments, and is fully EVM compatible to ease developer migration. Quantum-resistant signature schemes are planned for mainnet launch this summer.
Circle framed Agent Stack as part of an industry-wide push to rebuild payment rails for autonomous software, with the nanopayments layer aimed at transfer sizes and frequencies that traditional banking systems struggle to support. Similar efforts are emerging from MoonPay, BitGo, Visa and Stripe-backed Tempo, while Coinbase's Base layer-2 is preparing upgrades geared toward agent-driven commerce.
Circle's central bet is that USDC—with roughly $78 billion in circulation—becomes the default settlement asset for a "machine economy" in which software operates autonomously within policy-defined permissions and preset spending controls.
Separately, a whitehat attacker returned about $190,000 to Arbitrum-based dark pool protocol Renegade after exploiting a faulty smart contract in its V1 deployment. The incident drained 27 ERC-20 tokens worth $209,000, including $84,370 in USDC, $27,885 in wrapped Bitcoin and $23,950 in wrapped Ether. After the protocol posted an on-chain message offering a bounty in exchange for the return of 90% of funds, the attacker complied within 45 minutes. The exploit was linked to deployment code that failed to assign an explicit owner, compounded by a flawed migration introduced in an April 2025 software update that allowed the underlying contract logic to be rewritten.
Circle's Q1 2026 results, released alongside the announcement, showed USDC circulation rising 28% year over year to $77 billion and on-chain transaction volume jumping 263% to $21.5 trillion. Total revenue and reserve income reached $694 million, up 20% year over year.
Because USDC is a dollar-pegged stablecoin and the second-largest in the category, its price typically stays anchored near $1.00, making reserve dynamics and circulation flows more informative than standard technical indicators. Bulls point to expanding circulation and sharply higher settlement volumes as signals of continued institutional adoption. Bears focus on legislative risk that could let banks issue their own digital dollars and pressure Circle's market share.
Market watchers are tracking weekly USDC mint/burn ratios, Arc testnet throughput milestones and the Coinbase distribution arrangement. The long-term case would weaken if reserve income drops materially or if a major DeFi protocol shifts default liquidity away from USDC toward a competing exchange-backed dollar substitute. A sustained bull market in tokenized assets would support the longer-term upside thesis.
