CCTP is now supported on Stellar.

In this Release Notes episode, @Hui Jing from Circle DevRel explains what changed, how Stellar fits into CCTP, and what developers should know when building USDC flows to or from Stellar.

CCTP, or Cross-Chain Transfer Protocol, is Circle’s burn-and-mint protocol for moving USDC across supported blockchains. With Stellar support, builders can include Stellar in CCTP-powered USDC transfer flows.

This episode covers:
- Stellar’s CCTP domain ID: 27
- How CCTP message address handling differs on Stellar
- When to use the CctpForwarder contract
- Why user and muxed accounts need a USDC trustline
- How Stellar’s seven-decimal USDC precision maps to CCTP’s six-decimal message amounts

Resources:
- Supported domains table: [https://developers.circle.com/cctp/concepts/supported-chains-and-domains]
- Stellar contract addresses: [https://developers.circle.com/cctp/references/stellar-contracts] 
- Stellar technical overview: [ https://developers.circle.com/cctp/references/stellar ]
- Quickstart: transfer USDC to and from Stellar: [https://developers.circle.com/cctp/quickstarts/transfer-usdc-stellar-arc ]


Move USDC to and from Stellar with CCTP

The final post in the Unified Balance Kit series covers the preflight checks and recovery paths apps need around spend(), especially when delegated flows or mint-side failures can affect execution.

Unified Balance Kit: Production Safeguards and Recovery Patterns for spend()

Transaction memos on Arc give developers and businesses a way to attach structured context to onchain actions on Arc. That makes payments, payouts, deposits, withdrawals, and other financial workflows easier to reconcile, attribute, and connect to offchain systems.

Arc Transaction Memos: Structured transaction context for financial workflows on Arc

Part three of the Unified Balance Kit series focuses on partial liquidity and fallback rules for apps that start from available USDC but still need to validate each execution route.

Unified Balance Kit: Partial Liquidity, Routing, and Fallback Patterns

<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

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

The Arc Privacy Whitepaper frames privacy as opt-in confidentiality for real-world financial workflows, not anonymity. The core message is confidentiality with oversight: giving applications a way to protect sensitive transaction data and private smart contract state when needed, while supporting governed visibility for authorized parties.In this livestream, Circle will walk builders through the whitepaper and the design principles behind privacy on Arc. The discussion should cover why public-by-default transparency can limit use cases such as payroll, treasury operations, trading, lending, and swaps, how the Arc roadmap approaches confidential execution through ArcaneVM, and what developers should understand now while privacy functionality remains on the roadmap.Arc’s privacy features reflect a proposed design that includes selective shielding of certain onchain data elements. The scope, functionality, and rollout timeline of the Arc privacy features are subject to change and may be modified, delayed, limited, or discontinued at any time in the sole discretion of Arc Network Services LLC. See <a href="https://6778953.fs1.hubspotusercontent-na1.net/hubfs/6778953/PDFs/Whitepapers/Arc_Privacy_Sector%20(5).pdf" rel="noopener noreferrer" target="_blank">Arc Privacy Sector: Keeping Blockchain State, Transactions, and Accounts Private and Quantum Safe</a> for more.---Arc is offered by Circle Technology Services, LLC (“CTS”). CTS is a software provider and does not provide regulated financial or advisory services. You are solely responsible for services you provide to users, including obtaining any necessary licenses or approvals and otherwise complying with applicable laws.Arc has not been reviewed or approved by the New York State Department of Financial Services.The product features described in these materials are for informational purposes only and may be modified, delayed, or cancelled without notice at the sole discretion of Circle Technology Services, LLC. Nothing herein constitutes a commitment, warranty, guarantee, or investment advice.USDC is issued by regulated affiliates of Circle. A list of Circle’s regulatory authorizations can be found <a href="https://www.circle.com/legal/licenses?_gl=1*chseek*_gcl_au*MjQyNzQzODQ3LjE3NzAxMjkxNjguNTMzMTg2Mjc2LjE3NzIxMTg1NTcuMTc3MjExODc1Nw.." rel="noopener noreferrer" target="_blank">here</a>.

Privacy on Arc: What Builders Should Know

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 Cilantro Lagos (Victoria Island) 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: Cilantro Lagos, 7 Musa Yar' Adua St, Victoria Island, Lagos

Lagos | Community Meetup | Region Kickoff Mixer

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