Circle Internet Group on Tuesday announced the public testnet launch of Arc. Arc is an open Layer-1 blockchain, meaning a base network that runs on its own. Circle calls it a new “Economic Operating System” for the internet. A testnet is a trial version of a network where builders can test apps without real money.
Arc is built for developers and businesses. Circle says it offers:
- Fees you can plan for, set in U.S. dollars
- Fast final payments that settle in under a second
- Privacy you can turn on if you want it
- Built-in links to Circle’s own tools
Circle says these features fit real-world uses. They range from loans and markets to FX (foreign exchange) and global payments.
The launch has drawn wide interest. More than one hundred firms are taking part in early builds and tests. They come from finance, payments, tech, stablecoins, developer tools and crypto markets.
Circle says Arc is built to link local markets to the global economy. It also wants Arc to help more of that activity move onchain.
“With Arc’s public testnet, we’re seeing remarkable early momentum as leading companies, protocols, and projects begin to build and test. Combined, these companies reach billions of users, move, exchange, and custody hundreds of trillions in assets and payments, and support local economies across Africa, the Americas, Asia, Europe, and the Middle East,” said Jeremy Allaire, Co-Founder, Chairman and CEO of Circle.
He added, “This geographic diversity highlights a defining strength of Arc: its purpose-built to connect every local market to the global economy.
“Arc presents the opportunity for every type of company to build on enterprise-grade network infrastructure, advancing a shared vision that a more open, inclusive, and efficient global economic system can be built natively on the internet.”
A Financial Infrastructure Play
Circle says Arc is more than a general smart-contract platform. It points to two key features. The first is fixed settlement, which means a payment is final once it is confirmed. The second is fees paid in dollars.
Both aim to cut price swings and daily friction for firms used to bank payment rails. Circle hopes this design will draw in big market players and regulated firms. Many of them are testing tokens that stand for real assets, as well as new ways to hold and settle them.
Firms that run capital markets are among the early users. Circle named Apollo, BNY, Intercontinental Exchange and State Street.
Big banks and fund managers have also shown interest. They include BlackRock, Deutsche Bank, Goldman Sachs, HSBC and Standard Chartered. This fits Arc’s focus on large firms. They want to issue assets, hold them safely and settle trades onchain.
“As the digital asset ecosystem evolves, we’re focused on how emerging infrastructure can support tokenized markets and institutional liquidity,” said Robert Mitchnick, Global Head of Digital Assets at BlackRock.
“Exploring Arc will provide insight into how stablecoin-denominated settlement and onchain FX capabilities might enable more efficient capital markets and unlock additional utility for onchain assets.”
Payments, Fintech and Technology firms are Lining Up
Circle said payments are central to Arc. Fees you can plan for and fast final payments are meant to help with:
- Low-cost funding for shops and sellers
- Payouts in many currencies
- Fast payments across borders
These features appeal to payment firms and to firms that handle card payments for shops.
Big tech and payment firms joining the testnet include Amazon Web Services, Cloudflare, Mastercard, Visa, FIS and Nuvei. A long list of other payment firms has joined too.
“Circle’s launch of Arc is a meaningful step toward advancing programmable money and digital financial infrastructure,” said Raj Dhamodharan, executive vice president, Blockchain & Digital Assets at Mastercard.
“Deepening our longstanding work with Circle as an early design partner, Mastercard is exploring how we can help shape Arc’s foundation to enable secure, simple payment experiences across both fiat and stablecoin rails.”
“Our focus is on helping merchants move money globally with less friction, from checkout to settlement and payouts,” said Phil Fayer, Chairman and Chief Executive Officer at Nuvei.
“We’re evaluating Arc’s capabilities, sub-second finality, predictable dollar-based fees, and a built-in FX layer, to see how they might support faster merchant funding and multi-currency onchain payouts while maintaining the compliance and reliability our customers expect.”
Stablecoins From Many Countries
Arc’s plan gives stablecoins a core role in fees and trading. A stablecoin is a token tied to a currency such as the U.S. dollar. Circle said it is working with many stablecoin makers to bring their tokens to the network.
Testnet issuers come from many countries. Each token tracks a local currency. Here are some of them:
| Token | Country |
|---|---|
| AUDF | Australia |
| BRLA | Brazil |
| JPYC | Japan |
| KRW1 | Korea |
| MXNB | Mexico |
| PHPC | The Philippines |
| QCAD | Canada |
Wallets and Developer Tools
Arc is also set to plug into common tools for builders. Testnet partners include:
- Wallets such as MetaMask, Ledger and Fireblocks
- Builder tools such as Alchemy, Chainlink and Thirdweb
- Bridges that link chains, such as Wormhole and Stargate
- Node firms such as Chainstack, Blockdaemon and QuickNode
This setup should feel familiar to builders who already work with EVM networks. EVM stands for Ethereum Virtual Machine. It is the software that runs Ethereum-style apps. Learn more in our guide to blockchain interoperability.
A Broad Market Plumbing Layer
Beyond wallets and tools, Arc is drawing exchanges, trading firms and lending apps. Early testers include:
- DeFi exchanges such as Uniswap and Curve
- Big exchanges such as Coinbase, ByBit and Kraken
- Trading desks such as Cumberland and Galaxy Digital
- Lending apps such as Aave and Maple
Circle says this mix gives the network many ways in for trading and loans as it grows.
For now, Circle leads Arc’s early work and runs the network. But the firm says the public testnet starts a shift toward shared control by the community. The plan has three parts:
- Add more validators, the computers that confirm each payment
- Set up clear and open rules for how decisions get made
- Give many firms and builders a say in where the network goes
Circle wants Arc to be a neutral base layer that anyone can check. It wants that layer run by many groups around the world.
Many in the industry are curious and cautiously hopeful. Mathew McDermott, Global Head of Digital Assets at Goldman Sachs, said his firm is “excited to be part of an initiative that tests how programmable settlement and interoperable FX workflows can enhance regulated markets.”
HSBC’s Manish Kohli said the bank is “keen to explore how Arc can enable best practices and new technical infrastructure to help make global payments more efficient and connected.”
Circle issues the widely used USDC stablecoin through its regulated units. It sees Arc as the next step in making digital money and public blockchains easy for firms and banks to use.
With the testnet now live, Circle and its partners will watch closely. The key question is whether low fees, fast payments and built-in stablecoins can lead to real-world trials. The final test is wide use on the live network.
