Arc Mainnet is live. Arc launches as the Economic OS for the internet: an open platform for global markets, real-time value movement, tokenized assets, and agentic economic activity. Arc is more than a blockchain. It launches as a full-stack financial platform with assets, applications, interoperability, developer infrastructure, and Circle platform services live from day one. Arc delivers USDC as native gas, deterministic sub-second finality, EVM compatibility, and institutional validators. It integrates with Arc Studio, App Kits, Arc Portal, Circle Agent Stack, CCTP, Gateway, CPN, and StableFX. A complete economic platform at genesis. Arc launches with infrastructure for: → Agentic economic workflows → Lending and borrowing → Trading and liquidity → Onchain FX → Payments and settlement → Tokenized assets → Exchanges, wallets, custody, compliance, data, and developer tooling 190+ institutional and ecosystem builders are building across Arc.

For teams building on @Arc, Crossmint provides an all-in-one platform to launch money movement, embedded finance, and agentic economy apps fast. Arc gives you stablecoin-native rails, we help you put them to work. Read more in our Arc spotlight.

Extended moves to @arc on Thursday. Settlement migrates from Starknet to Arc on October 22 at 13:00 UTC. The migration is planned with no interruption to trading. Positions can still be liquidated during this time, so top up margin beforehand. Transfers between sub-accounts stay open. Most accounts need to do nothing. Your account, sub-accounts, positions, orders, history, points and keys carry across unchanged. USDC migrates as native USDC, ETH migrates 1:1 as wETH, and Vault (XVS) balances and withdrawal rights are preserved. If you hold more than $1 of USDT or wBTC in any sub-account, you must act by 12:00 UTC on October 21: - Authorise the conversion in-app. USDT converts to USDC and wBTC to cirBTC at 1:1 during the migration, with no swap fees. Extended credits a 0.50% premium. - Or withdraw both assets. If you miss the deadline, your whole account will be restricted for up to 30 minutes on October 21 while Extended cancels orders, closes positions in the affected sub-accounts at mark price with no fees, and returns your USDT and wBTC to your login wallet. Deposits and withdrawals will be paused for up to 2 hours during the migration. Full details can be found in the documentation: docs.extended.exchange/about…

One of the top markets firms in LATAM and Argentina, @Allaria_SA, bringing deep two-side USDC/ARS liquidity is a big deal for USDC in Argentina, unlocking broader fintech, payments, and capital markets adoption.

Most teams building with stablecoins want to ship a product, not assemble a blockchain stack. @crossmint is bringing wallets, money movement, compliance tooling, embedded finance, and agentic infrastructure to Arc. That gives builders a faster path to: → Stablecoin payments → Cross-border remittances → Embedded wallets → Financial apps that feel familiar to users Arc provides the stablecoin-native execution layer underneath. arc.io/blog/how-crossmint-su…

Argus for Agents on @arc Give your agent $USDC. Put it to work. Launch tokens on @Uniswap. Buy, sell, lock, and claim creator fees straight to your wallet. All through Argus MCP or @circle CLI. Every agent gets a seat.

💪 Introducing the $1M fund for @arc builders 💸 Up to $10K in credits per team. Apply now 👇

Arc 🤝 @Alchemy Alchemy is introducing a $1M credit program for eligible Arc builders, with up to $10K in credits per team. Bring an existing app to Arc, consolidate your infrastructure on Alchemy, or ship your first USDC payment flow. alchemy.com/credits-program/…

Aave V4 on @arc crossed $100 million active loans.

Launch tokens on @arc and manage your entire project with Argus, all from your favorite AI harness. Built with @Circle’s Agent Wallet SDK, a dedicated MCP, and an agent skill. Works with Claude Code, Codex, Hermes, and more.

Ecosystems are built one connection at a time. FAZE meets onchain funds on @kairo_market Only on @arc

USDC on Arc gives agents a way to pay for the intelligence they use. Jamie, founder of Alethieum, is building Ando so apps, agents, and robots can access intelligence and pay for it directly. In this conversation with @bleso_a, Jamie explains why existing payment flows fall short, how MPP-I works, and why he chose Arc for USDC settlement. Plus, a demo of Ando Wallet with an app, an autonomous agent, and a robot simulation sending testnet USDC. Chapters 0:00 The Ando story and open access to intelligence 8:31 MPP-I: handling payment without interrupting inference 11:03 Inside the inference and payment flow 23:34 Why Arc: fast finality and USDC gas 32:24 Open access and the Ando Wallet walkthrough 49:06 Connecting OpenCode to Ando 54:02 Hermes manages its own inference 57:57 Ritchie robot simulation 1:02:30 The robot sends testnet USDC; the Circle tools behind Ando 1:08:16 What the agent economy could look like 1:12:03 Jamie’s advice for developers building on Arc

Hey @Arc and @Circle communities! What would make Arc House and our Discord communities more useful to you? Tell us what works, what’s missing, and what you’d like next. Each survey takes 10–15 minutes. You can also earn 50 points on Arc House between now and Nov 1. See Instructions: community.arc.io/pages/commu…

WEEK 3 — ARC ACCELERATION SEASON The third week of the 6-week program with @Arc is done, where we're working with fintech and AI startups as they take their businesses to the next stage of growth on Arc. On Tuesday, the teams joined a product masterclass with Rocío Girado and Julieta Habif from @paisanos_io. Wednesday was set aside for mentoring sessions, and on Thursday we hosted public office hours at Arc House. Every startup also received feedback on their first deliverable this week, so we can keep working closely with each team on the goals they set for the rest of the program. A packed but incredible week!

Agents shouldn’t need a human with a credit card to access the tools they use. Jamie built Ando and MPP-I so agents can pay for intelligence directly with USDC on Arc. Preview the conversation now. Full episode drops Oct. 19 at 12 PM ET.

There is one Arc Studio feature that, if you’re not using while building onchain, you’re debugging blind. It’s called Tracing. Let’s imagine you’re building an app that sends USDC. You click send and approve the transaction in your wallet, but your app is still loading. Now you’re not sure what’s going on. Did the wallet connect? Was the transaction submitted? Was it confirmed onchain? Did the contract emit the expected event? Instead of checking your browser console, wallet, and explorer separately, Tracing shows the full flow in one timeline. You can see every step, how long it took, where something failed, and the data your app sent and received. You could paste logs into an AI coding tool and ask it to debug them. But the real value of Tracing is that it automatically captures the full onchain flow first, so the AI has the right context to explain what happened. You can also click Ask Studio and let the AI explain the trace for you. Start building today at studio[dot]arc[dot]io

A sneak peek at the Tolly Agent Exchange, being built on @arc. As the agent economy grows, discovering services is only part of the challenge. Users and other agents will need ways to compare offerings, identify reliable providers, and understand what's actually happening across the ecosystem. Tolly Agent Exchange is being developed as a comprehensive discovery and analytics platform, bringing x402 service comparisons, agent directories, job and task tracking, and performance analytics together in one place. At the heart of the Exchange, independent operators will be able to establish public business profiles showcasing their agents' capabilities, services, pricing, and verifiable activity history. Bringing greater transparency to agent services, reputation, and economic activity on Arc.

Built something in Arc Studio? Ship it on Arc Mainnet and apply for one of 8 microgrants, 500 USDC each. Experiments must be built in Arc Studio and move real USDC on Arc Mainnet. Submissions close Nov. 1. Details + apply: dorahacks.io/hackathon/arc-m…

Week 4 of the Arc Accelerator Program was an insightful session on finding product-market fit led by @Jib0xD, founder of @ryskfinance. We explored how stablecoins and programmable money can solve real-world problems, the importance of understanding user pain points, and how to validate demand early. It was a great learning experience that reinforced the importance of building products around real user needs rather than assumptions.

Aave V4 is live on Arc. Kolten of Aave breaks down the Core Hub, plus Main and Forex markets built for borrowing, lending, and liquidity on Arc.