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Introducing the Arc Fintech open-source sample app. A multichain treasury system built to demonstrate how developers can move capital across chains without added complexity. Built with Circle Developer-Controlled Wallets, Circle Gateway, and Bridge Kit + Forwarding Service to show how treasury ops can run with native crosschain movement on Arc. Try it out: github.com/circlefin/arc-finte...…

Arc Community Spotlight: Social Payments with USDC Powered by XyloNet

We returned to London for our second @encodeclub hackathon bringing together 150+ builders shipping on Arc. For the first time, teams experimented with nanopayments, unlocking new models for microtransactions, agentic commerce, and programmable stablecoin apps. Across six tracks, developers integrated Arc Testnet with Circle’s developer platform using USDC, USYC, StableFX, CCTP, Nanopayments, and Circle Wallets. → 80+ submissions → 8 winning teams The Arc team spent the weekend mentoring builders while @bleso_a walked through the new multichain Arc sample app to help teams get shipping faster. The Arc builder ecosystem keeps growing. Here’s what the winning teams built: 🏆 Nanopayments USDC-ME (1st): A gasless “Venmo for USDC” using Nanopayments where signed spend intents batch settle with near-zero fees. Blink (2nd): Streaming laptop insurance priced per-second using nanopayments. 🏆 Best Smart Contracts Chariot: A cross-chain lending protocol combining borrower interest with USYC T-bill returns. 🏆 Chain-Abstracted USDC Apps MeanTime: Turns CCTP transfer delays into tradable liquidity using Transfer-NFTs. 🏆 Global Payouts & Treasury Settl: A multi-chain payroll and treasury system that automates fund management, executes global USDC payouts, and includes built-in fraud detection and real-time treasury visibility. Zerra: A chain-abstracted storefront where merchants always receive USDC on Arc regardless of user assets. 🏆 Agentic Commerce OTTO: An AI treasury agent that manages USDC across chains, pays services with nanopayments, and allocates funds into USYC. 🏆 USYC / StableFX Integration Sphere: A visual treasury dashboard for managing wallets, swaps, USYC or DeFi routing, and automated financial workflows.

AI agents are becoming builders. Circle Skills now support building with Arc and Circle’s full-stack platform, giving AI coding tools best-practice guidance for stablecoin-native applications. Use them with Cursor, Claude Code, Codex, or any agent to generate Arc integrations for: → @USDC payments → Crosschain flows → Wallet infrastructure → Smart contract logic http:/github.com/circlefin/ski...…

We brought 100+ developers together in Buenos Aires for our first Arc Studio. An afternoon of deep technical sessions, candid ecosystem conversations, and real builder momentum. From protocol design to funding pathways, the focus was simple: What can be shipped on Arc? The energy in the room made one thing clear. Builders are ready. Huge thank you to our panelists: @BuFi_Global @dynamic_xyz @Morpho @0xsequence This is how ecosystems compound. More to come.

On Arc, @peerxyz provides fast, cheap, and simple fiat to stablecoin onramps for builders and users.

Arc and USDC merch? Yes.

Building with AI? Connect with other builders and share what you are developing for Agentic Commerce.

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