Mike Tsui

SVP Engineering @circle, advisor

[Cash App @CashApp]

Stablecoins are here on Cash App.

Send and receive USDC that auto-converts to USD, fee-free to start.

No wallet setup. No extra app. Just Cash App.

[Mike Tsui @m1ketsui]

@milessuter @CashApp 🔥

[Jeremy Allaire - jerallaire.arc @jerallaire]

Circle Agent Stack is 🔥🔥🔥

Take it for a spin in Claude, Codex, Cursor Claw or more. Permissionless Agent Wallets. Build your own x402 agentic service provider, consume hundreds of services. Multichain. Nanopayments. Circle CLI.

[Gagan Mac @gaganmac]

Read more about our plans. Android brought internet to 80% of the world's pockets. With Arc as the economic OS - we want to bring financial opportunities to every corner of the internet.

Arc token delivers the coordination mechanism that keeps us true to this mission.

https://t.co/gwNVRfAMav

[Gagan Mac @gaganmac]

We’re just getting started.

[Jeremy Allaire - jerallaire.arc @jerallaire]

Circle sits at the heart of tokenization:
- USDC the largest regulated tokenized dollar
- EURC the largest regulated tokenized euro
- USYC the largest tokenized money fund
- CIRCLE - now the largest tokenized stock in the world

(RWAxyx shows the leaderboard: https://t.co/sbLOEfXzLy)

[Circle @circle]

We’ve made it much easier for LLMs and AI agents to understand and write code using Circle products.

Here is what is live for AI-native dev workflows.

🗺️ /llms.txt

An AI-native index that helps agents discover the right Circle docs, guides, and code examples faster: https://t.co/N3tSum8kll

📝 Docs → Markdown

Add .md to any Circle docs URL to instantly get clean, structured markdown, ideal for LLMs and tooling: https://t.co/uddWDPrx9w

🤖 Export to Claude & ChatGPT

Send docs directly into Claude or ChatGPT so models get accurate, up-to-date context when generating code.

🔌 MCP Server

Plug Circle’s MCP server into your AI apps to generate higher-quality, more reliable code with Circle products: https://t.co/zONpBxd1lb

The goal?

Less friction between docs, AI tooling, and production code, so you can ship faster with programmable @USDC.

[Mike Tsui @m1ketsui]

@gaganmac @USDC @moltbook 👀 🦞

[Circle @circle]

Arc Public Testnet is live.

@Arc is an open Layer-1 blockchain designed to serve as the Economic OS for the internet, uniting programmable money and onchain innovation with real-world economic activity.

Arc is uniquely suited to be a new trusted foundation for:

→ Lending and financial services
→ Capital markets
→ Tokenized asset issuance
→ Stablecoin settlement worldwide

With deterministic sub-second finality, stablecoins as native gas, and opt-in configurable privacy, Arc is purpose-built to meet the needs of the global financial system.

It’s built for a world where:

→ Financial apps are as accessible as email
→ Dollars, euros, pesos, and other fiat currencies move instantly
→ Private transactions that support compliance happen at scale
→ AI agents transact and coordinate commercial activity autonomously

Arc testnet is already seeing participation from leading companies across capital markets, global payments and technology platforms, and full-stack developer infrastructure providers.

Guided by Circle’s vision of making money truly open and programmable, Arc is public internet infrastructure that invites everyone to build, coordinate, and transact onchain.

Start building: https://t.co/wl9Y650JrD
Read the release: https://t.co/fUf1Kd3o7k

[Arc @arc]

Arc Public Testnet is now live.

Open to developers and enterprises globally, Arc is the Economic OS for the internet that unites programmable money and onchain innovation with real-world economic activity.

Start building: https://t.co/XmFdy0SG5g
Learn more: https://t.co/JOGsf9Ma5V

[Circle @circle]

Circle Gateway is now available on HyperEVM from @HyperliquidX, @SeiNetwork, @SonicLabs, and @world_chain_

✅ Non-custodial, chain-abstracted @USDC
✅ Frictionless, instant crosschain UX
✅ Enables capital-efficient treasury management
✅ One integration for on-demand liquidity across 11 supported chains

Gateway is built on a core primitive: decoupling source chain block finality from crosschain settlement.

Once USDC is deposited into Gateway from any supported chain, Gateway consolidates your balances across chains into a unified USDC balance.

Use your chain-abstracted USDC instantly when and where it’s needed for DeFi, payments, treasury rebalancing, and more.

This is a new crosschain paradigm.

Now available on @arbitrum, @avax, @base, @ethereum, HyperEVM from @HyperliquidX, @optimism, @0xPolygon, @SeiNetwork, @SonicLabs, @unichain, and @world_chain_ with more blockchains expected.

Start building today: https://t.co/opXNVOMCdG

[Arc @arc]

Introducing Arc, an open Layer-1 blockchain purpose-built for stablecoin finance.

From payments to FX to capital markets, Arc is the home for builders innovating with digital money and tokenized value on the internet.

Stablecoins have shown us what’s possible.

They’ve powered trillions in onchain transactions and unlocked a faster, more open financial system.

Arc is designed to provide an enterprise-grade foundation with the performance, reliability, and liquidity needed to scale stablecoin use cases worldwide.

Featuring:
✅ USDC as native gas
✅ Built-in FX engine
✅ Deterministic sub-second finality
✅ Opt-in privacy
✅ Full Circle platform integration

At its core is Malachite, a high-performance consensus engine developed by @informalinc that powers Arc with safety, liveness, and resilience at scale.

Arc expands the design space for stablecoins by uniting speed with certainty and delivering the native tooling needed to meet real-world business obligations.

Open and composable, Arc is designed to interoperate seamlessly with the broader multichain ecosystem.

Fully EVM-compatible, developers will be able to build on Arc using the same frameworks and tooling they know and trust.

Together, we’re laying the foundation to move stablecoin finance from early adoption to globally trusted infrastructure.

Arc will enter private testnet in the coming weeks, with public testnet expected this fall.

Read the litepaper → https://t.co/CyaV9GRbPW
Join us in building the new internet financial system → https://t.co/0qxv7q80Gp

[Circle @circle]

Introducing Arc, the home for stablecoin finance.

@Arc is an open Layer-1 blockchain purpose-built to drive the next chapter of financial innovation powered by stablecoins.

Designed to provide an enterprise-grade foundation for payments, FX, and capital markets, Arc delivers the performance, reliability, and liquidity builders need to meet global financial demands.

Arc features:
✅ USDC as native gas
✅ Built-in FX engine
✅ Deterministic sub-second finality
✅ Opt-in privacy
✅ Full Circle platform integration

Open, composable, and EVM-compatible, Arc is designed to interoperate seamlessly with the broader multichain ecosystem.

As part of our mission to advance blockchain infrastructure, we're excited to welcome the Malachite team and IP from @informalinc to Circle. Arc is built on Malachite’s high-performance consensus engine.

In line with our commitment to open-source development, the core software for Arc will be released under a permissive license, enabling the broader developer community to contribute, extend, and build on top.

Serving as foundational infrastructure for the internet, Arc will enable 24/7 global settlement that’s as seamless and native as messaging on the web.

Arc will enter private testnet in the coming weeks, with public testnet expected this fall.

Read the litepaper: https://t.co/2nn7o1Q6oA
Let’s build the new internet financial system together: https://t.co/fE2aTnnjrL

[Jeremy Allaire - jerallaire.arc @jerallaire]

A powerful and pivotal moment.

[Circle @circle]

Thank you to all our Circlers and trusted partners around the globe.

We have just rung the closing bell at Circle HQ in One World Trade Center to end trading on the @NYSE, but this is just the beginning for Circle.

[Circle @circle]

Circle, an internet financial system for global prosperity.

[Circle @circle]

Celebrating being listed on the NYSE!

Opening Bell.

[Circle @circle]

Circle is now officially a public company, listed on the @NYSE under $CRCL.

With @USDC, EURC, Circle Payments Network & more, we're pushing forward a future of frictionless value exchange.

We are not just building financial products. We are building the money layer of the internet.

To everyone who has contributed to this moment, thank you.

[Circle @circle]

Announcing Circle Payments Network!

A streamlined way for financial institutions to connect, orchestrating global money movement, powered by stablecoins like USDC and EURC for 24/7 real-time settlement.

Existing cross-border payments can be slow and expensive.

CPN is designed to bring efficiencies to the payments system.

With CPN, banks and payment providers can move money at internet-speed using fully reserved digital dollars and euros.

It is not just faster.

It is programmable, secure, and always available.

CPN will support:
✅ Invoice payments
✅ Remittances
✅ Treasury services
✅ Payroll & contractor payouts

Leading banks are contributing their deep expertise in global payments to design a network that meets the needs of banks worldwide.

The global network is already taking shape, with over 20 design partners, including @dLocalpayments, @WorldRemit, @BVNKFinance, @yellowcard_app, @coinsph and more.

We are not just building stablecoins.

We are building a modern infrastructure for global payments.

Learn more: https://t.co/pHXVbOyJHr

[Jeremy Allaire - jerallaire.arc @jerallaire]

Hong Kong Telecom (HKT), the dominant telecom in HK, and @circle have begun collaboration on bringing smart account wallets and Web3 digital assets to their customer’s mobile experience. Slowly, then suddenly.

https://t.co/UkVpHkdCf5