Uniswap is coming to Arc Mainnet. For builders, this matters because liquidity is not a secondary feature of an onchain economy. It is part of the application layer. Wallets need swap paths. DeFi protocols need routing and pool access. 

Arc x Uniswap🦄 Swap and liquidity infrastructure for Arc 

Arc Testnet is upgrading to v0.7.2 with a hardfork on June 18, 2026 at 12:00 UTC. The developer-facing features are transaction memos, which let builders attach payment references directly onchain, and batch transactions, which let multiple calls execute in one transaction. Node operators must upgrade to v0.7.2 before activation or their nodes will desync from Arc Testnet.

Transaction memos and batch transactions activate on Arc Testnet

Crosschain transfers should not require developers to manage wallets, infrastructure, and gas fees across multiple chains.

In this Release Notes episode, we cover the Circle Forwarding Service for Gateway and how it simplifies crosschain USDC transfers by automatically handling destination chain minting.

Learn how developers can:

- Remove the need for multichain infrastructure
- Eliminate destination chain gas handling
- Improve the crosschain user experience
- Enable forwarding with a single query parameter

We also cover other important details, including transfer attestations, fee handling, etc

Happy building.


Are you a builder? Be sure to:
👉 Start building by signing up for a Circle Console account: https://console.circle.com/signup 
👉 Join the Circle community and participate in our weekly live building workshops: https://discord.com/invite/buildoncircle 
👉 Follow us on X: https://x.com/BuildOnCircle 
👉 Read our blog:  https://www.circle.com/blog/tag/build-on-circle 
👉 Browse our docs:  https://developers.circle.com/

How to Simplify Crosschain USDC Transfers with Circle Forwarding Service.

Benedikt Schuppli, Co-Founder and Chief Innovation Officer of Obligate, joins Sam Sealey to explain how his team is building the financial infrastructure that makes tokenized securities a real, regulated, institutional-grade alternative to traditional bond markets.

Benedikt walks through why the existing system — built on paper certificates, custodian banks, and centralized clearinghouses — carries far more overhead than it needs to, and how smart contracts and stablecoins like EURC can replace that entire stack, end-to-end.

Key Takeaways:

00:00 Introduction.  
01:10 Benedikt is a Swiss-trained lawyer who joined one of Switzerland's first crypto exchanges in 2016.
02:04 His early thesis: all securities — bonds, derivatives, private credit — would eventually be issued and transferred as tokens.
05:49 Obligate started in 2020, survived FTX's collapse and the 2023 bear market, and kept building throughout.
06:33 Circle's investment in late 2022 validated Obligate's vision of regulated onchain finance at its most controversial moment.
07:54 Keyrock recently issued the first fully blockchain-based corporate bond through Obligate, denominated in EuroC — no traditional banks involved.
11:00 Switzerland's progressive regulations eliminated the need for transfer agents, giving Obligate a strong early regulatory foundation.
13:39 High fees and multi-day delays in traditional payments made stablecoins the clearest proof of blockchain's real-world value.
14:49 TradeFlow Capital still physically mails paper coupons to Luxembourg in 2026 — exactly the broken process Obligate replaces.
17:25 Obligate has reached seven-figure revenue and is raising a Series A to expand into the US.

Thanks for listening to the Circle Builder Series. To learn more about Circle, please visit www.circle.com/developer. If you enjoyed this episode, please leave a 5-star review on your favorite podcast platform, and be sure to subscribe so you never miss any insightful conversations.

EURC is issued by regulated affiliates of Circle. See Circle’s list of regulatory authorizations. Circle Ventures, an affiliate of Circle Internet Financial, LLC, has invested in Obligate.

Resources Mentioned:


Obligate website:
https://www.obligate.com

Circle Developer Resources:
https://www.circle.com/developer


Tokenizing Debt Markets: Obligate's Onchain Bond Infrastructure

Hackathons

<h3>​The Lepton Agents Hackathon is Canteen's two-week builder series in partnership with Circle on Arc!</h3>​For hackers that want to create AI agents that pay, receive, and orchestrate nanopayments — settled on Arc, Circle's stablecoin-native L1.​What does this mean for me?<ol><li data-list="bullet">​A $50K prize pool (in cash or equivalents) across grand prizes, standout teams, and easter eggs</li><li data-list="bullet">​Direct access to Canteen's research, founders, and network</li><li data-list="bullet">​Real settlement on Arc — sub-second finality, ~$0.01 USDC fees</li><li data-list="bullet">​Six published Requests for Builders (RFBs) </li><li data-list="bullet">​Mentorship and programming throughout the two weeks</li></ol>​Why Lepton?​AI agents are becoming economic actors. They discover each other, pay for services, and build a record of who delivered, a market run by software. But the work they trade in is small and constant, and most chains can't price it: a sub-cent payment is eaten by gas, and a volatile fee token makes a budget impossible to hold.​The lepton was the coin that solved this the first time. The name endured for two and a half millennia: a lepton was 1/100 of the drachma, the smallest money in Greek pockets until the euro arrived in 2002. Nanopayments put that unit back in circulation for machines, and Arc is where they clear: predictable USDC fees instead of volatile gas, sub-second deterministic finality, and stablecoin-native settlement at the protocol layer. That's what we're here to build on, paired with Circle's full-stack platform: USDC, CCTP, Gateway, and App Kit.​Who this is for?​You should be comfortable shipping fast and talking to users! We love researchers, students, and engineers — even those new to crypto.​Dates: June 15 – June 29, 2026​Format: Online, 2 weeks​Access: Apply to join, Use code LEPTONHOUSE in the Luma: <a href="https://luma.com/5xcrazms" rel="noopener noreferrer" target="_blank">https://luma.com/5xcrazms</a>IMPORTANT LINKS:&gt;&gt; Luma: <a href="https://luma.com/5xcrazms" rel="noopener noreferrer" target="_blank">https://luma.com/5xcrazms</a>&gt; &gt; Website: <a href="https://lepton.thecanteenapp.com/?utm_source=luma" rel="noopener noreferrer" target="_blank">https://lepton.thecanteenapp.com/</a>​&gt;&gt; Discord : <a href="https://discord.gg/rsVfYutFZg?utm_source=luma" rel="noopener noreferrer" target="_blank">https://discord.gg/rsVfYutFZg</a>​&gt;&gt; Kickoff meeting (11 AM ET on June 15): <a href="https://www.twitch.tv/arjun_canteen" rel="noopener noreferrer" target="_blank">https://www.twitch.tv/arjun_canteen</a>​

Hackathon: Lepton Agents

The Stablecoin Commerce Stack Challenge is a 3-month virtual program led by Ignyte, with Circle and Arc as technical sponsors, bringing together developers to explore how stablecoins can address key regional opportunities across:<ol><li data-list="bullet">Cross-border payments and remittances</li><li data-list="bullet">SME finance and trade workflows</li><li data-list="bullet">Tokenized assets and compliant DeFi</li><li data-list="bullet">The agentic economy</li></ol>Participants can compete for sponsored bounty opportunities that leverage Circle’s developer platform on Arc.Learn more <a href="https://app.ignyte.ae/public/challenges/4B436318-C737-F111-9A49-6045BD14D400" rel="noopener noreferrer" target="_blank">here</a>.

Hackathon: The Stablecoins Commerce Stack Challenge

<h2>Stablecoins are the fastest-growing sector in crypto. Arc is where you build with them.</h2>In this bootcamp you'll learn all about stablecoins and Arc, the stablecoin-native Layer-1 blockchain.<h3>Why Arc</h3>Most blockchains treat stablecoins as just another token. Arc treats them as the foundation. <ol><li data-list="bullet">USDC is the gas token → no volatile fees, no pricing uncertainty</li><li data-list="bullet">Sub-second settlement → real-time financial applications</li><li data-list="bullet">Built-in crosschain transfers (CCTP/Gateway) → move money across chains natively</li><li data-list="bullet">Integrated FX (StableFX) → convert between currencies onchain</li><li data-list="bullet">Full developer stack included → wallets, contracts, payments, messaging</li></ol>Instead of stitching together multiple protocols, you build directly on a chain designed for money movement.<h3>What you'll learn</h3><ol><li data-list="bullet">How to design applications around programmable money flows</li><li data-list="bullet">How to use CCTP + Gateway for crosschain payment orchestration</li><li data-list="bullet">How to integrate StableFX for multi-currency settlement</li><li data-list="bullet">How to build production-ready financial apps using Circle’s stack</li></ol>By the end of the bootcamp, you’ll have built:<ol><li data-list="bullet">A crosschain payment flow using CCTP</li><li data-list="bullet">A stablecoin-powered smart contract using Circle Contracts</li><li data-list="bullet">A wallet-enabled app using Circle Wallets</li><li data-list="bullet">A multi-currency payment or treasury flow using StableFX</li></ol><h3>Who this is for</h3>Developers who want to understand stablecoins and start building with them. The course is fully async.learn more at, <a href="https://www.encodeclub.com/programmes/arc-bootcamp?scheduleTab=298&amp;scheduleTag=299" rel="noopener noreferrer" target="_blank">Encode Club</a>

Programmable Money on Arc Bootcamp

Join us for a Discord exclusive Office Hours session. This is a casual hangout with the Arc community team, and builders across the ecosystem. Ask questions and talk about the latest developments on Arc for the week!Click <a href="https://discord.com/events/1423729540160815207/1493628390916231371" rel="noopener noreferrer" target="_blank">here </a>to get a reminder.

Arc Discord Office Hours

Nigeria

Kick Off Mixer - Let's meet!Cross-border payments: Why Cross-Border Payments Are Still Broken and how Arc is solving thisJoin us at Maison Fahrenheit Rooftop for an Arc Meetup - an evening for builders, founders, investors and DeFi teams curious about cross-border payments, Arc and what’s coming next. Whether you’re building cross-border payment solutions or just exploring Arc, this is the place to start.Location: Maison Fahrenheit, 80 Adetokunbo Ademola Street, Victoria Island, Lagos

Lagos | Community Meetup | Region Kickoff Mixer

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