# Circle's Arc Mainnet Goes Live *Author: David Feld, William Peaster* *Published: Sep 16, 2026* *Source: https://www.bankless.com/read/circles-arc-mainnet-goes-live* --- To date, you might fairly describe Circle's business model as staying neutral. In other words, USDC is distributed wherever users already are (e.g. Ethereum, Solana, Base, Tron, etc.), and then chains compete for its liquidity. Alas, that singular era is seemingly over. Today, Circle officially flipped the greenlight switch on Arc, its own Layer 1 blockchain. Now the stablecoin giant will be building its own blockspace instead of only renting it. If you haven’t been following the Arc story, Circle first announced plans for the EVM-compatible L1 back [in August 2025](https://www.bankless.com/read/circle-unveils-arc-its-evm-compatible-l1). The chain’s testnet rolled out [in October 2025](https://www.bankless.com/read/news/circle-announces-public-testnet-for-arc-finance-focused-l1-blockchain), and nearly one year later mainnet has finally arrived. > [ — (@) > ](https://twitter.com/circle/status/2100170801240543557?s=20) ### So what is Arc? At the most basic level, Arc is an EVM-compatible Layer 1, meaning Ethereum apps can largely redeploy there without learning a new programming language or rebuilding from scratch. Under the hood, transactions execute through the Ethereum-compatible Reth client and are finalized by Circle's Malachite consensus engine. The bigger differences are in what Circle has optimized around it. Gas is paid directly in USDC, transactions reach finality in under a second, and developers can deploy permissionlessly even though the network itself launches with a permissioned set of known validators, including BlackRock, Mastercard, Visa, DTCC, and Standard Chartered. Arc also supports post-quantum wallet signatures from day one. You can think of it as Circle trying to split the difference between crypto and TradFi: open apps on top with more predictable, institution-friendly infrastructure underneath. ### What's actually live? There is already plenty to do beyond simply moving USDC around. More than 100 applications are live, spanning foundational DeFi (Uniswap, Aave, Morpho) as well as memecoins ([fomo](https://x.com/fomo/status/2100209373532271093?s=20) and [Pump.fun](https://Pump.fun)), which Circle has been loud about supporting as a basis for growing the chain's culture. Among what's already running, Circle's CTO, [Nikhil Chandhok](https://x.com/chandhok), made a note of calling out [StableFX](https://x.com/arc/status/2099981597332189607?s=20), an onchain FX system purpose-built for swapping USDC against a growing roster of local stablecoins. That bridge function is central to one of Circle's broader ambitions for Arc: rather than issuing every local stablecoin itself, Circle wants Arc to connect local currencies to USDC liquidity and, ultimately, to one another. Beyond the tech already live, Circle is also putting unusual emphasis on the layers above the blockchain that make all of this easier to use. There's: - [**Arc Portal**](https://portal.arc.io/), which acts as the network's front door: users can fund a wallet, swap assets, find apps, access yield opportunities, track their balances, and fund agent wallets. - [**Arc Studio**](https://studio.arc.io/), which acts as an AI coding agent that can turn a prompt into application logic, smart contracts, and deployment-ready code. - [**App Kits**](https://www.arc.io/app-kits), which package common actions like payments, swaps, onramps, bridging, and earning into ready-made SDKs instead of making developers stitch the whole flow together themselves. Together, these products are meant to make Arc easier to use for more than just crypto-native developers, lowering the friction for users, builders, and eventually agents to interact with the chain. [![](https://media.beehiiv.com/cdn-cgi/image/fit=scale-down,format=auto,onerror=redirect,quality=80/uploads/asset/file/25e961b8-b017-43cc-b406-f9b096095b56/image.png?t=1789576234) ](https://studio.arc.io/) ### What's next There is much more to come for the chain overall, particularly in the short term. [Chandhok said Arc's two major focuses](https://www.bankless.com/podcast/arc-mainnet-ai-agents-and-tokenized-markets) over its first few months will be 1. privacy and 2. agents. **On privacy**, Circle is developing an opt-in Privacy Sector that would let users hide balances and transaction details while selectively revealing information when necessary. The planned system runs private transactions inside trusted execution environments, essentially protected hardware enclaves that keep their contents hidden even from Circle and Arc's validators. **On agents**, Circle has already laid some of the groundwork with USDC being the predominant currency used for emergent agent payment protocol, x402, as well as the buildout of its [Agent Stack](https://x.com/circle/status/2098486736397402420?s=20) which offers policy-controlled wallets and infrastructure for agents to discover and pay for services. The next step is making those agents look more like independent economic actors. Circle is working toward verifiable agent identities and histories, reputation systems, and eventually credit, so an agent could prove what work it has done, earn money, hire another agent, or potentially borrow based on its track record. > [ — (@) > ](https://twitter.com/Bankless/status/2100259558539305029?s=20) ### The bigger Arc bet This gets to what may be the most important part of Circle's thesis. Chandhok doesn't want Arc to simply siphon USDC, DeFi, and users away from Ethereum. As he put it, moving existing activity from Ethereum to Arc doesn't actually grow Circle's market. The bet is instead on creating markets that barely exist today: agents paying and hiring one another, machine-scale credit, global stablecoin FX, tokenized assets reaching new buyers, and institutional activity that would never have moved onto a fully public ledger. Arc has plenty of competition. Tempo is attacking stablecoin payments and machine commerce from a more payments-infrastructure-heavy angle, while Plasma has pushed further toward the consumer with Plasma One. Arc is taking a broader swing: institutional markets on one side, open crypto on the other, and an especially large bet that autonomous agents become a whole new category of economic participant. Whether that creates genuinely new activity or just another destination for existing crypto liquidity is now the question. For much more on what Circle thinks comes next, I'd recommend checking out our [full conversation with Chandhok](https://www.bankless.com/podcast/arc-mainnet-ai-agents-and-tokenized-markets). Lots more to dig into. --- *This article is brought to you by [NEAR](https://www.bankless.com/sponsor/near-1785257427?ref=read/circles-arc-mainnet-goes-live)*