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: docs.arc.network Learn more: arc.network/blog/circle-la…

The Arc team joined builders in New York for ETHGlobal NYC, with 15,000 USDC in prizes for teams building on Arc. Across six tracks, 65 teams shipped apps and primitives exploring: → Advanced stablecoin logic → Chain-abstracted USDC flows → Prediction markets → Agentic economy use cases → Arc integrations for existing projects The creativity, ambition, and quality of the submissions stood out. Here’s what the winning teams built: 🏆 Best Agentic Economy with Circle Agent Stack Mars: On-chain audited marketplace where AI agents safely buy verified skills. Submission Showcase: ethglobal.com/showcase/mars-… Sidekick: Perpetual futures built for AI agents, not humans. Per-block funding, no liquidations, on Arc. Submission Showcase: ethglobal.com/showcase/sidek… 🏆 Best Smart Contracts on Arc with Advanced Stablecoin Logic OpenPop: The OpenClaw of verifiable agent workflows, lowers capital costs by turning invoice financing into deals for investors. Submission Showcase: ethglobal.com/showcase/openp… WorldColony: A colony of 200 AI "ant" agents that research, debate and bet on World Cup matches, fully on-chain. Submission Showcase: ethglobal.com/showcase/world… 🏆 Best Chain-Abstracted USDC Apps Using Arc as a Liquidity Hub Vouch DeFi: Zero-collateral credit backed by who you are, not what you own. Private AI, USDC on Arc. Submission Showcase: ethglobal.com/showcase/vouch… AnyAsset Checkout : Checkout links where any EVM asset becomes a merchant-settled USDC. Submission Showcase: ethglobal.com/showcase/anyas… 🏆 Best Prediction Markets Built on Arc with Real-World Signal Cumulant : Structured products on prediction markets - baskets, tranches, PPNs, & continuous markets. Submission Showcase: ethglobal.com/showcase/cumul… 🏆 Best Private Nanopayments (in partnership with Dynamic and Unlink) Manila: Private, on-chain, programmable, and agentic USDC payroll and vesting on Arc. Submission Showcase: ethglobal.com/showcase/manil… Slip: Send money by email/phone; recipients claim privately as local stablecoins, no wallet needed. Submission Showcase: ethglobal.com/showcase/slip-… 🏆 Arc Continuity Track Thurman Protocol: Automated secondary loan sales with onchain USDC settlement and trustless execution. Submission Showcase: ethglobal.com/showcase/thurm… Bitrouter: DeFi micro-savings app that rounds-up daily purchases into AI-optimized yield. Submission Showcase: ethglobal.com/showcase/bitro… Thanks to all the teams that took part and congratulations to the winners! The Arc builder ecosystem keeps growing.

Welcome @vyperlang on @Arc. This article highlights Vyper’s great work on Arc Testnet. • Identity: ERC-8004 • Settlement: x402 + Circle payment flows • Workflows: escrow, subscriptions, payments community.arc.io/home/blogs/wha…

Building a global app often means building for multiple currencies. We built an open-source stablecoin FX sample app on Arc testnet to make that easier. With AppKit Swaps and Circle Wallets, developers can enable swaps between USDC, EURC, and cirBTC with less integration work. Use it as a starting point for: → Payments → Treasury → Marketplaces → Consumer apps → Multi-currency product experiences Explore the repo and show us what you’re building: github.com/circlefin/arc-…

Vyper on Arc Testnet shows what comes after agentic payments. Agents need more than wallets. They need identity, settlement, and programmable controls. @vyperlang is building toward agentic economic workflows with: → ERC-8004 agent identity → x402 payment flows → USDC settlement → Escrow, subscriptions, splits, and spending limits A blueprint for agents that transact under rules, not just send funds. arc.io/blog/building-…

The @Arc builder meetup series at Encode Hub is officially underway! This is just the start, you can expect regular meetups, co-working, workshops, builder events... the IRL Arc community in London is taking shape 👀

Privacy on Arc: What Builders Should Know x.com/i/broadcasts/1…

That was the @arc Teresina event. Folks from Ceará, Piauí, and Maranhão, three Brazilian states, were present at the event. @bobbilee @BrazillianCare @onnerB_ @Adm69421196 x.com/onnerB_/status…

Brasil @arc meetup

Arc Transaction Memos are now available on Arc Testnet. Memo-enabled calls add structured context to contract execution, preserve sender attribution, and only emit memo events when the contract call succeeds. Use them to: → Add invoice IDs, payout refs, or customer IDs → Track payment context onchain → Make payments easier to reconcile Start building: docs.arc.io/arc/tutorials/…

Agents Already Spent $76 Million: Circle's AI Agent stack, x402, stablecoins and the Agentic Economy Shoal Signal with @corey__cooper, Senior Manager, DevRel at @circle, hosted by @zaddycoin We cover how Circle is building the agent money stack with $USDC, @ARC, x402, why EIP-3009 makes payments gasless, who is actually transacting today, whether SaaS is dead, and why agents buying their own services points to a trillion dollar TAM. 0:00 What Circle is building for agents 3:01 Why x402 matters for builders 6:54 USDC, gasless transfers, and facilitators 10:57 The Circle agent stack and nano payments 14:17 Who is using x402 and for what 16:46 Pay-per-use flattens the internet 19:50 A new persona, and $76 million transacted 23:03 What is missing for agent to agent 28:05 Every app has APIs, the TAM is trillions 29:26 Is SaaS dead 31:57 Discovery as the real value layer 36:28 How Circle curated its marketplace 41:23 Why it has to run on stablecoins 46:00 Cash App to agent in one second 49:38 Where the alpha is, trading on Robinhood 52:08 Try it yourself

The benefits of programmable onchain credit on Arc.

@Uniswap 🦄

Uniswap is the number one DEX for stable ⇄ stable trading Arc is the chain purpose-built for stablecoins Full circle 🦄

Shout out to the Brasil Community on @arc Excited to see the community spread

@peterschroederr 111

The Arc ecosystem continues to grow.

Mundane process. Repeat. Mundane process. Repeat. Mundane process. Repeat. Arc is built to break the loop.

Memos and batch payments, critical features for payment use cases is now available on testnet

A transaction hash is not enough for serious financial workflows. If you’re moving money onchain, you need context: Who was paid? What invoice was settled? Which account does this map to? What batch, payout, or customer does this belong to? That’s why transaction memos on @arc matter. They let developers attach structured context to contract calls without needing to redesign existing contracts. This is one of those infrastructure details that may not sound flashy at first… …but if you’re building apps that move money, it’s the kind of thing that makes everything work. Read more as @silencexlm breaks it down on Arc House 👇 community.arc.io/home/blogs/arc…

Oh this will be a good! One of the most anticipated features coming to @arc

"transfer failed" is usually hiding three different problems: you don't have the funds, there's no route you allowed, or it quietly took a backup path Arc gives builders those three states so the app can stop making you guess which one it was