Introduction

For most of blockchain's history, stablecoins have been passengers on infrastructure built for other purposes. USDC launched on Ethereum, a network designed for smart contracts and decentralized applications. It later expanded to Solana, Tron, and other layer-2 networks, each with their varying gas tokens, fee mechanics, and settlement speed. The stablecoin fit in, but the infrastructure was never purpose-built around it.

That is the problem Circle is trying to solve with Arc.

On May 11, 2026, Circle disclosed a $222 million token presale for Arc, valuing the network at $3 billion and drawing institutional backing from BlackRock, Apollo Funds, and a16z crypto. The announcement came alongside a Q1 earnings report showing USDC circulation at $77 billion and on-chain transaction volume up 263% year over year

The scale of both the adoption numbers and the institutional backing tells a consistent story. Circle is not building Arc as a product experiment. It is building it as the infrastructure layer it believes USDC has always needed.

This article explains what Arc is, how it works, how USDC is integrated into its core architecture, and what this means for traders, developers, and institutions operating in the stablecoin ecosystem today.

What Is Arc Blockchain?

Arc is an open, EVM-compatible Layer-1 blockchain developed by Circle and purpose-built for stablecoin finance. It is not a Layer-2 solution built on top of Ethereum, nor a fork of an existing chain. Arc is a standalone network with its own consensus mechanism, execution environment, and fee model, designed from the ground up for financial applications rather than general crypto activity.

Circle describes Arc as the "Economic OS for the internet," a phrase meant to convey that Arc is positioned as base-layer infrastructure for programmable money, the same way an operating system provides the foundation for software to run. The analogy is deliberate. Just as mobile and cloud infrastructure became foundational platforms over the past two decades, Circle's CEO Jeremy Allaire argues blockchain infrastructure is undergoing the same shift, and Arc is Circle's bid to sit at that layer.

Arc entered public testnet in October 2025. By February 2026, the testnet had processed more than 166 million transactions with sub-second finality and near-perfect uptime. As of May 2026, more than 100 major institutions have participated in testnet activity, including BlackRock, Visa, Goldman Sachs, Deutsche Bank, Mastercard, AWS, and HSBC. The mainnet is targeted for summer 2026, per the Arc whitepaper released on May 2026

Arc's primary distinction from other Layer-1 blockchains is that it uses USDC as its native gas token instead of a volatile network asset, making it the only major Layer-1 where transaction fees are paid in dollars by design.

On Ethereum, Solana, and most other Layer-1 networks, transaction fees are paid in the chain's own native token. The dollar cost of a single transaction can change dramatically depending on both token price and network congestion. For businesses running treasury operations, payment flows, or capital markets settlement on-chain, that volatility introduces a layer of financial unpredictability that has no equivalent in traditional finance.

Arc removes that problem entirely. Every transaction fee on Arc is paid in USDC, making costs stable, foreseeable, and straightforward to account for. A treasury team operating on Arc does not need to hold a separate volatile asset to run its workflows.

That design choice is not cosmetic. It reflects the intended user base. Arc is built for institutions, enterprises, and developers who need financial infrastructure that behaves like financial infrastructure.

How Arc and USDC Are Built Around Each Other

The relationship between Arc and USDC is structural, not just technical. USDC is not one asset among many on Arc. It is the operating currency of the network, integrated across fees, liquidity, interoperability, and the broader Circle product stack that Arc plugs into.

Using USDC as gas means every participant on Arc, whether a DeFi developer, a payments company, or a bank running treasury operations, operates in a single dollar-denominated currency environment. There is no need to acquire, hold, or manage a separate volatile network token. Gas fees are paid in the same asset that denominated the transaction itself.

For developers, this simplifies application design significantly. For enterprises, it removes an entire category of operational and accounting friction. For end users, it means the cost of a payment or settlement is transparent and stable.

USDC and ARC serve distinct and complementary roles on Arc. USDC handles transaction fees, providing the stable, dollar-denominated cost model that institutional users require. ARC handles everything else that makes the network function as a shared, governed system. 

 

The whitepaper describes ARC as the "native coordination asset," not the gas token. The two serve different and complementary roles.

ARC's four core functions:

1. Governance: ARC holders vote on key economic parameters including fees, inflation rates, and burn logic once Arc transitions to proof-of-stake

2. Staking and network security: ARC supports the transition from the current permissioned proof-of-authority model to a decentralized proof-of-stake system where validators and stakers earn rewards

3. Fee capture and burn: Protocol fees paid in USDC are programmatically converted to ARC at the protocol layer, split between validator and staker rewards and a permanent burn mechanism, connecting network activity to token economics

4. Platform utility: Active stakers and builders receive benefits including reduced gas costs, lower fees on platform services, and priority access

In this model, USDC and ARC are not competing assets but two layers of the same system. USDC provides the stable transactional medium that institutions need to operate predictably. ARC provides the coordination layer that aligns validators, developers, and governance participants with the network's long-term success. 

 

Arc is not a standalone chain that happens to support USDC. It is natively integrated across Circle's full product stack. That includes USDC, EURC (Circle's euro stablecoin), USYC (a tokenized yield-bearing instrument), Circle Payments Network, Circle Cross-Chain Transfer Protocol (CCTP), Circle Gateway, Paymaster, institutional on and off-ramps, and a suite of developer tools.

CCTP is the infrastructure that makes USDC genuinely portable across blockchains without introducing third-party custody risk. Unlike wrapped token bridges, which lock USDC on a source chain and issue a synthetic representation elsewhere, CCTP burns USDC on the source chain and mints an equivalent amount of native USDC on the destination chain.

The result is that USDC arriving on Arc from Ethereum is Circle-issued USDC, not a bridged substitute carrying additional counterparty risk. As of 2026, USDC is natively available on over 30 blockchains, with CCTP processing more than $140 billion in cumulative transfer volume across more than 20 chains.

Circle Gateway extends this further by enabling chain-abstracted USDC balances, meaning developers can access unified USDC liquidity across chains without managing the operational complexity of moving assets between networks manually.

When Arc reaches mainnet, it becomes one more destination within this already-live infrastructure. The integration is not something that needs to be built after launch. It is part of how Arc was designed.

StableFX is Arc's built-in foreign exchange engine, enabling 24/7 stablecoin-to-stablecoin trading with on-chain settlement directly on the network. It combines Request-for-Quote execution with atomic settlement for stablecoin pairs, using USDC as the anchor currency in trades involving EURC and other regional stablecoins.

Traditional foreign exchange markets operate through fragmented venues, bilateral counterparty agreements, prefunded accounts, and T+1 settlement cycles. StableFX is designed to replace that structure with programmable settlement at sub-second finality, removing the need for pre-funded accounts and bilateral arrangements with multiple counterparties.

For companies running cross-border payouts, global treasury operations, or multi-currency financial products, StableFX positions Arc as more than a payments chain. It is infrastructure for institutional foreign exchange built to the standards of compliance, operational control, and settlement certainty that financial firms require, rather than the open swap mechanics common in DeFi.

The Technical Architecture Behind Arc Blockchain

Arc's architecture combines three core design decisions that separate it from general-purpose blockchains: a dedicated consensus engine, an Ethereum-compatible execution layer, and configurable privacy controls built for institutional workflows. 

Understanding how Arc works technically helps explain why it is suited to the use cases Circle is targeting.

Malachite is Arc's consensus engine, designed to deliver deterministic finality, meaning once a transaction is confirmed on Arc it is irreversibly settled with no probabilistic confirmations or wait periods for deeper block burial. It was developed with expertise from Informal Systems, a team specializing in Byzantine Fault Tolerance and formal verification.

For financial workflows, deterministic finality is a critical requirement. A payment, a securities settlement, or a margin transfer needs to be actually final, not just probably final. Arc satisfies that requirement in under one second, with testnet benchmarks showing approximately 780 milliseconds for 100 validators processing 1MB blocks, a speed competitive with traditional payment rails.

Arc is built with an Ethereum Virtual Machine execution layer based on Reth, an open-source Ethereum execution client. This means developers can build on Arc using the same tools, languages, and frameworks they already use for Ethereum development, including Solidity, Foundry, and Hardhat. 

Established developer tools like Alchemy, Chainlink, Thirdweb, and MetaMask are also integrated in the testnet environment.

EVM compatibility is strategically important because it lowers the barrier to entry for the developer ecosystem that would otherwise need to learn Arc-specific tooling from scratch. It also means the existing library of Ethereum smart contracts and application patterns can be deployed on Arc with minimal modification.

Arc includes configurable privacy features designed specifically for institutional use cases. The model is opt-in rather than default, meaning privacy is available as a feature for workflows that require it rather than applied to all activity on the network.

The first feature is confidential transfers, which shields transaction amounts while keeping sender and receiver addresses visible. That creates a middle ground between full transparency and full anonymity, suitable for institutions that need to keep payment amounts private between counterparties while maintaining auditability for compliance and reporting purposes.

In April 2026, Circle also confirmed that Arc will launch with post-quantum security features, including an optional quantum-resistant signature scheme for wallets. Circle has described quantum resistance as a baseline requirement for serious institutional infrastructure, noting that most existing blockchains do not have a realistic roadmap to address post-quantum vulnerabilities.

Why BlackRock, a16z, and Apollo Backed Arc's $222M Token Raise

The presale announced on May 11, 2026, is significant for reasons beyond the headline number. The composition of the investor group is the more meaningful signal.

a16z crypto led with $75 million. BlackRock, the world's largest asset manager and the custodian of most of USDC's reserve assets through its BUIDL money market fund, participated directly. Apollo Funds, a major private credit manager, joined alongside Intercontinental Exchange, the parent company of the New York Stock Exchange (NYSE). 

Other participants included Janus Henderson, Standard Chartered Ventures, ARK Invest, SBI Group, Marshall Wace, General Catalyst, Bullish, Haun Ventures, and IDG Capital.

This is not a crypto-native funding round with a few strategic co-investors. It is a capital table that reads like a cross-section of institutional finance. As a16z crypto wrote in a blog post on the day of the announcement, the problem Arc is solving is that internet infrastructure USDC runs on today was not built with large institutions in mind. Arc is the response to that gap.

Circle sold 740 million ARC tokens at $0.30 each in the presale, with a total supply of 10 billion tokens. The allocation structure breaks down as 60% for ecosystem participants including developers and users, 25% retained by Circle to operate validator infrastructure and earn staking income, and 15% held in long-term reserve. 

Circle is the first publicly listed company to conduct a token presale, signing the agreements on May 8, 2026, and formally disclosing the completed raise in its Q1 earnings filing with the SEC on May 11th.

The presale is also widely read as a defensive move. As The Block noted, some investors fear that stablecoin legislation advancing through Congress, including the GENIUS Act already signed into law and the CLARITY Act due for a Senate vote, could encourage banks and fintechs to launch competing dollar tokens, reducing the need for a third-party issuer like Circle. 

Owning Arc's infrastructure would reduce that vulnerability, giving Circle direct control over the rails USDC settles on rather than depending on Ethereum, Solana, and other third-party networks.

Arc Blockchain Use Cases: Payments, FX, Tokenized Assets, and AI Agents

Arc is not built for every blockchain use case. It is designed specifically around the workflows that stablecoin-native finance requires at institutional scale.

Global payments today depend on correspondent banking networks, intermediary accounts, and settlement timelines that can span days. USDC already improves on this model by providing 24/7 availability and internet-speed transfers. Arc adds sub-second deterministic finality and dollar-denominated fees to make those payments more reliable and operationally straightforward at scale.

Circle Payments Network, which generated $8.3 billion in annualized transaction volume as of March 31, 2026, is one of the applications that runs on top of this infrastructure.

Arc is designed to support delivery-versus-payment (DvP) and payment-versus-payment (PvP) settlement for tokenized financial instruments. DvP means the asset and its payment transfer simultaneously, so neither buyer nor seller is exposed to the risk of one leg settling without the other.

PvP applies the same logic to currency exchanges, ensuring both sides of a foreign exchange transaction settle at the same time. Applied to tokenized securities, Treasuries, commodities, and structured products, this removes a category of counterparty risk that traditional capital markets infrastructure has struggled to eliminate.

With USDC and USYC as native assets, counterparties on Arc can execute this kind of atomic settlement directly on-chain. This is the use case that institutions like BlackRock and Goldman Sachs are actively testing on Arc's public testnet, with reported workloads spanning tokenized funds, cross-border payouts, and capital markets settlement.

Arc is designed to support not only human-initiated financial activity but machine-to-machine economic coordination, making it a natural infrastructure layer for autonomous AI agents that need to hold money, execute payments, and settle transactions without human involvement.

On the same day as the presale announcement, Circle launched Circle Agent Stack to make this concrete. The toolkit includes Circle CLI, Agent Wallets, Agent Marketplace, and Nanopayments powered by Circle Gateway, giving AI agents the ability to transact in USDC programmatically across Arc's network.

The fit between Arc and agentic commerce is structural. AI agents operating at scale need settlement that is fast, cost-predictable, and denominated in a stable currency. Arc's sub-second finality, USDC-native fees, and programmable infrastructure directly satisfy those requirements in a way that general-purpose blockchains with volatile gas tokens do not.

What Arc Means for the USDC Ecosystem

The most direct way to understand what Arc means for USDC is to look at what it changes about USDC's position in the market.

Today, USDC is widely distributed but dependent on the infrastructure choices of third-party networks. When Ethereum fees spike, USDC transactions get caught in the same congestion. When Solana has an outage, USDC on Solana is unavailable. Circle's revenue from USDC reserves depends on adoption, and adoption depends partly on how reliably USDC works across the networks it runs on.

Arc gives Circle a network where USDC is the native operating currency, not just a  supported asset. Circle controls the fee model, the finality parameters, the privacy features, and the compliance tooling. If Arc gains traction as a settlement layer for institutional finance, USDC becomes embedded in infrastructure that Circle owns rather than infrastructure it depends on.

That shift matters for the long-term economics of USDC and for Circle as a public company. With $77 billion in circulating supply and $21.5 trillion in on-chain transaction volume for a single quarter, USDC is already operating at institutional scale. Arc is the infrastructure bet that the next phase of that scale should run on rails built for it.

Conclusion

Arc represents a broader shift in how stablecoin infrastructure is being designed. Instead of treating USDC as an application running on third-party networks, Circle is building a blockchain where stablecoin finance sits at the center of the architecture itself. From USDC-denominated gas fees and sub-second deterministic finality to built-in FX settlement and institutional compliance controls, Arc is structured around the operational requirements of global financial systems rather than general crypto activity.

The significance of Arc is not only technical. It reflects Circle’s attempt to secure greater control over the infrastructure layer that powers USDC as stablecoin competition intensifies and tokenized finance moves closer to institutional adoption. The backing from firms like BlackRock, Apollo Global Management, and Andreessen Horowitz signals that major financial players increasingly see blockchain settlement as infrastructure worth owning, not just using.

Whether Arc succeeds will depend on adoption after mainnet launch, particularly among institutions handling payments, FX, treasury operations, and tokenized assets at scale. But Circle’s direction is already clear. Arc is not being positioned as another Layer-1 competing for retail attention. It is being built as a settlement layer designed specifically for stablecoin-native finance.

FAQs

What is Arc blockchain? 

Arc is an open Layer-1 blockchain built by Circle, the issuer of USDC. It is purpose-built for stablecoin finance and uses USDC as its native gas token, with sub-second finality and EVM compatibility.

How does USDC relate to Arc? 

USDC is Arc's native gas token and the primary operating currency on the network. Arc is also natively integrated with Circle's full product stack, including CCTP and Gateway, making USDC movement across chains a core feature of the network.

Who has invested in Arc? 

The $222 million ARC token presale, disclosed in May 2026, was led by a16z crypto and backed by BlackRock, Apollo Funds, Intercontinental Exchange, ARK Invest, Standard Chartered Ventures, SBI Group, and others.

Is the ARC token available to trade?

As of May 2026, the ARC token from Circle's presale is not listed on any public exchange. 

What is StableFX on Arc? 

StableFX is Arc's built-in institutional foreign exchange engine, enabling 24/7 stablecoin-to-stablecoin trading with on-chain settlement between USDC, EURC, and other supported pairs.