We’re thrilled to share Arc1 with our developer community. Announced last month, Arc is an open Layer-1 blockchain designed from the ground up for stablecoin finance (StableFi). It stands alone as its own ecosystem, with USDC as native gas, a built-in FX engine, instant finality, opt-in privacy, and seamless Circle platform integration.
More than just a home for USDC, Arc is where stablecoins can thrive. Arc supports payments, FX, and markets — all running at internet scale with the infrastructure they deserve.
It was a pleasure to celebrate Arc with developers in person during August’s Dev Summit NYC. For those who couldn’t make the event — or just want to learn more — check out the Arc litepaper to see how the blockchain kicks off a new dawn for the internet financial system.
—Team Circle
Start Building
Tip of the Month
Did you know you can give users the same wallet address across multiple EVM chains? Unifying wallet addresses simplifies users’ crosschain experience and provides a possible recovery path if they send tokens to unsupported chains.
For Developer-Controlled Wallets, make sure you use the same walletSetId and refId when creating or deriving wallets across chains. This will enable address consistency and help you to recover tokens on unsupported chains by signing and broadcasting transactions. For User-Controlled Wallets, the recovery path is available by default. When you create wallets using the same user JWT — such as one generated through social login — the wallets will share the same address across supported EVM chains.
New Releases
Circle Gateway Now Live on Mainnet
Circle Gateway is now live on mainnet for Arbitrum, Avalanche, Base, Ethereum, OP Mainnet, Polygon, and Unichain. Gateway enables developers to build with a unified USDC balance that can be accessed on any supported chain — and it’s coming to more blockchains soon, including Arc.
To help get you started, we created a detailedQuickstart Guide covering how Gateway works and how best to integrate it into your application.And that’s not all.With just a few lines of code, you can query the Gateway API to view a user’s USDC balance across all supported domains:
// Check USDC balance across all supported domains const gatewayClient = new GatewayClient();
Explore the full integration flow—from deposit, to attestation, to mint—in the Gateway Quickstart on GitHub. Start building with a unified USDC balance today.
Ecosystem Spotlight
Blockradar integrates Circle Gateway
Blockradar is raising the bar for multichain finance as a Day 1 Circle Gateway builder. Instead of managing deposits across Base, Ethereum, Polygon, and more, Gateway unifies all inflows into a single USDC balance. Paired with Blockradar’s auto-settlement feature, funds flow directly from master wallets into Gateway, eliminating manual deposits, bridging steps, and reconciliation. Operators save on time and fees, and gain cleaner records. For end users, deposits are as simple as fiat, without needing to think about chains or extra steps. Together, Blockradar and Gateway make scalable, user-friendly stablecoin operations a reality. ReadBlockradar's announcementto learn more.
Community Highlights
CPayant powers African businesses
Cross-border payments in Africa can be slower and costlier than businesses hope for. The CPayant team, which seeks to revolutionize the way intra-African trade is done, is working to fix that. Its app lets approved users instantly send USDC to 15 countries — and cash out locally in minutes. Explore a future without payment delays.
Announcements
Apply to access the Arc testnet
Interested in building on Arc? We plan to gradually onboard teams to the Arc private testnet ahead of the public testnet launch. If you’re interested in building early, let us know.
Congratulating ETHGlobal NYC winners
August’s ETHGlobal hackathon in NYC brought the energy:
💻 25 teams built on Circle’s developer platform
🏆 5 teams took home a share of 10,000 USDC in bounties
Projects ranged from sustainable web search to biometric payment-authentication with blockchain-based settlement. Join us in celebrating the winning teams, and take a lookat how they used Circle’s tools to solve real-world problems.
Upcoming Events
Look out for Circle at these upcoming conferences and events:
OCT 1–2
Token 2049 Singapore
Singapore
Come build with us, or just stop by to say hello.
1Arc is offered by Circle Technology Services, LLC (“CTS”). CTS is a software provider and does not provide regulated financial or advisory services. You are solely responsible for services you provide to users, including obtaining any necessary licenses or approvals and otherwise complying with applicable laws.
Arc has not been reviewed or approved by the New York State Department of Financial Services.
The product features described in these materials are for informational purposes only. All product features may be modified, delayed, or cancelled without prior notice, at any time and at the sole discretion of Circle Technology Services, LLC. Nothing herein constitutes a commitment, warranty, guarantee or investment advice.
Services are provided by Circle Technology Services, LLC (“CTS”). Services do not include financial, investment, tax, legal, regulatory, accounting, business, or other advice. CTS is only a provider of software and related technology and is not engaged in any regulated money transmission activity in connection with the services it provides. For additional details, please click hereto see the Circle Developer terms of service.
