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Circle went live with Arc mainnet. It’s a layer-1 blockchain, and it runs on USDC as the native gas token. Not a test. Not a soft launch. The real thing.
Arc is built to handle stablecoin payments and financial market transactions, with a specific focus on what Circle calls “agentic” transactions — the kind of automated, machine-to-machine economic activity that’s becoming a bigger deal as AI-driven financial systems grow. The network offers Ethereum Virtual Machine compatibility, which means developers can port existing tools and contracts without rebuilding from scratch. Settlement finality clocks in at sub-second speed, which matters a lot when you’re moving real money across borders or between institutions.
Jeremy Allaire, Circle’s CEO, called the Arc launch the most significant since USDC itself went live. That’s a bold claim from a company that’s spent years becoming one of the dominant stablecoin issuers globally. Circle posted on social media that Arc is built for “programmable money, global markets, and agentic economic activity” — positioning it squarely at developers and institutions, not retail traders flipping tokens.
What Arc Actually Supports
The stablecoin lineup on Arc is wide. Over 20 fiat stablecoins are supported natively, including USDC, EURC, JPYC, KRW1, and TRYB. That’s not just dollar-pegged assets — it’s yen, euro, Korean won, Turkish lira. Real geographic breadth, which matters if you’re building cross-border payment rails. And it’s not just stablecoins. Tokenized assets are on the platform too. BlackRock’s BUIDL fund and Circle’s own USYC are both natively available on Arc, which gives institutions something more than a payments pipe — it’s basically a financial market layer.
Interoperability runs through Circle’s Cross-Chain Transfer Protocol, known as CCTP, and its Gateway product. Together, those tools connect Arc to more than 20 blockchains. That’s a pretty wide net.
Who Showed Up Before the Mainnet
The public testnet kicked off in October 2025. Over 100 companies joined — BlackRock, Goldman Sachs, Mastercard, and Visa among them. That’s not a small list. And it wasn’t just the public testnet. Before Circle opened Arc up broadly, more than 100 institutional participants had already been working inside a private mainnet version since August. So by the time the mainnet went live, the network had seen serious traffic from serious players.
That kind of institutional engagement is worth paying attention to. Stablecoin infrastructure has attracted a lot of hype over the years, but actual participation from Goldman Sachs and Visa in a testnet environment is a different signal than a press release partnership.
The ARC Token Question
Circle minted 10 billion ARC tokens through a genesis mint. Big number. But the company was quick to clarify — this doesn’t mean a public token launch is coming. At least not now. Circle’s language was careful: the mint is a foundational step in Arc’s development, not a signal that ARC hits exchanges anytime soon.
Whether that holds is unclear. Token launches have a way of materializing after exactly this kind of “we’re not saying yes” language. But for now, Circle seems focused on getting the network stable before thinking about anything else.
The longer-term plan does include a shift from Proof of Authority to Proof of Stake by 2027. That’s a meaningful change in how the network operates and who gets to participate in validating transactions. It’d open Arc up to a broader set of participants and probably change the economics of running a node. Details on exactly how that transition works aren’t spelled out yet.
Arc also plans to widen participation in network operations generally, though specifics on that are thin right now.
What’s clear is that Circle is betting Arc becomes the backbone for stablecoin-native financial infrastructure — not just a faster way to send USDC, but a full platform where tokenized assets, programmable payments, and institutional-grade settlement all live together. Whether the 100-plus companies that showed up for the testnet stick around for the mainnet is the real question. Goldman and BlackRock participating in a test environment costs relatively little. Committing real transaction volume to a new layer-1 is a different decision entirely.
Circle minted 10 billion ARC tokens and launched a mainnet with sub-second finality. The network supports over 20 stablecoins and connects to more than 20 blockchains. Allaire called it the biggest moment since USDC.
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Frequently Asked Questions
What is the native gas token on Circle’s Arc mainnet?
Arc uses USDC as its native gas token, meaning transaction fees on the network are paid in USDC rather than a separate protocol token.
Which major companies participated in Arc’s testnet?
BlackRock, Goldman Sachs, Mastercard, and Visa were among the over 100 companies that joined Arc’s public testnet, which launched in October 2025.
Will Circle launch the ARC token publicly?
Circle minted 10 billion ARC tokens through a genesis mint but clarified that the mint does not signal an intention to release the token publicly at this time.
Why It Matters
The launch of Circle's Arc mainnet underscores a significant shift toward integrating stablecoins into mainstream financial infrastructure, particularly in automated transaction frameworks driven by AI. By utilizing USDC as the native gas token, Arc not only enhances the utility of stablecoins but also signals a growing acceptance among institutional players, which could further legitimize and stabilize the broader cryptocurrency ecosystem. This development aligns with the increasing demand for efficient, automated financial transactions, potentially impacting how value exchange occurs across various sectors.
