Circle extends CCTP to EURC and cirBTC on the Arc chain

Circle 将跨链转移协议扩展至 USDC 之外，原生支持 EURC 和 cirBTC

Circle 已将跨链转移协议（CCTP）的应用范围从 Arc 网络上的 USDC 扩展至原生支持的 EURC 和 cirBTC 转账，同时为 Gateway 和 Bridge Kit 的更多多资产工作流做准备。

CCTP 的多资产扩展与路由覆盖

Circle 已将其 CCTP 功能从仅限 USDC 扩展至支持在 Arc 路由上进行 EURC 和 cirBTC 的原生转账。目前，EURC 已通过 CCTP 在 Arc、Avalanche、Base、Ethereum 和 World Chain 等路由上实现流通。cirBTC 的 CCTP 支持目前连接了 Arc 和 Ethereum 网络，而 Gateway 集成计划稍后推出。

Gateway 产品目前统一了 Arc 和 Ethereum 上的 USDC 余额，未来将支持更多资产。Arc 于 9 月 16 日上线，具备以 USDC 支付Gas费、机构验证者以及跨越二十多个区块链网络的互操作性特征。

根据 9 月 23 日的更新，“Arc 互操作性”（Interop on Arc）现已正式上线，CCTP、Gateway 和转发服务（Forwarding Service）已集成至 Layer 1 层。这为开发者提供了针对 Circle 原生发行资产、第三方代币、新型多链资产以及统一余额的独立工具。

需要注意的是，此次部署并不意味着所有 Circle 产品都以相同方式支持这三种资产。目前，CCTP 仅在特定路线上对 USDC、EURC 和 cirBTC 生效，而 Gateway 在初期仅支持 USDC。Circle 表示，未来将逐步增加对 Gateway 中 EURC 和 cirBTC 的支持。

技术机制：燃烧铸造与锁定铸造

CCTP 现在允许开发者在不同链之间移动更多受支持的资产，包括 USDC、EURC 和 cirBTC。Bridge Kit 也将支持扩展的多资产工作流。该系统最初是围绕 USDC 的“燃烧-铸造”（burn-and-mint）转账设计的，旨在让受支持的资产在不同链之间以 1:1 的比例无缝移动。

对于 Circle 发行的资产，CCTP 会在源网络上销毁代币，并在目标网络上铸造原生代币，从而避免了传统桥接设计中常用的流动性池。这种机制确保了资产转移的安全性和效率。

各资产的路由差异与费用结构

这三种资产的网络覆盖范围并不完全相同。USDC 仍是 CCTP 最成熟的资产，可以使用当前 Arc 互操作性堆栈提供的所有兼容路由。EURC 支持 Arc、Avalanche、Base、Ethereum 和 World Chain；而 cirBTC 目前仅支持 Arc 和 Ethereum。

Circle points out that on supported Arc routes, CCTP Fast Transfer can complete transfers in "less than 10 seconds." However, the company warned in the terms that since the results depend on the selected chain, route and network conditions, transfer time and cost estimates are not guaranteed.

Another part of the Forwarding Service processing process. After CCTP completes the asset movement, the service relays transactions on the target chain, allowing users to conduct supported transactions without having to separately hold Gas tokens from the target network.

In addition, Circle updated the CCTP in early September to introduce a prepaid fast fee transfer feature. Developers can now quote and charge certain cross-chain fees on the source network, allowing applications to display expected amounts to recipients before the transfer is executed. According to a September 23 announcement, Arc routes enjoy preferential CCTP pricing, but rates vary by asset and route. Circle has not announced a uniform Arc transfer rate that applies to USDC, EURC and cirBTC.

Gateway's status and multi-asset roadmap

Gateway products create a unified balance by consolidating funds distributed across different networks, allowing applications to treat eligible cross-chain liquidity as a single available balance. Currently, on Arc, Gateway only supports USDC balances on Arc and Ethereum. Gateway support for EURC and cirBTC is listed as "coming soon" and Circle has not disclosed a specific release date.

Circle's current legal disclosures also describe Gateway as supporting only USDC. The company emphasizes that Gateway is a non-managed software infrastructure and does not itself hold, control or transfer customers 'assets. According to the product disclosure, the product has not been reviewed or approved by the New York State Department of Financial Services or other regulatory agencies.

Circle has been working on building multi-asset interoperability over the past few months. The April product roadmap pointed out that CCTP has processed USDC transfers totaling more than US$140 billion on more than 20 chains, and plans to expand the model to assets such as EURC and cirBTC. The September 23 release translates part of the roadmap into production environment infrastructure, but Gateway's asset expansion is still underway.

Third-Party Asset Support and Arc Ecosystem Development

Circle's interoperability stack is not limited to tokens issued by Circle. Arc Interoperability also supports third-party assets through packaging technology and the Cross-Chain Token Standard (CTS). Developers and publishers can use CTS when they need control features such as whitelists, transfer rate limits, suspensions, upgrades, and governance rules. Circle stated that it does not retain coverage rights for CTS or custom third-party token contracts and that the issuer is responsible for its token structure, operating rules and regulatory obligations.

Arc Studio, an AI-assisted development tool, provides a separate development environment where teams can build applications using the same interoperability stack without having to manually connect each service. Examples cover scenarios such as cross-border payments, software billing, and machine-to-machine transactions.

Arc 主网于 9 月 16 日正式公开上线，支持以 USDC 支付交易手续费、确定性亚秒级最终确定性以及许可的创始验证者集。Circle 表示，上线时已有超过 100 家机构和生态系统建设者，以及超过 100 个应用程序参与。创始验证者包括贝莱德（BlackRock）、DTCC、Galaxy、ICE、万事达卡、MoneyGram、SBI集团、渣打银行、住友商事、Visa 和 Worldpay 等。

自上线以来，Arc 的资产层迅速扩展。cirBTC 于 9 月 21 日可用，随后 StableFX 于 9 月 22 日上线，综合互操作性产品于 9 月 23 日集成。StableFX 利用 Arc 提供 24/7 的稳定币外汇结算，采用询价定价和原子化付款交收机制。

Circle 表示，cirBTC 已可作为 Arc 借贷市场（包括支持的 Aave 和 Morpho 应用）的抵押品。符合条件的 Circle Mint 客户可存入原生 BTC，铸造 cirBTC，将其提供给批准的第三方借贷市场，并通过 Circle 的数字资产抵押贷款工作流程获得借出的 USDC。

主网路线图不仅限于互操作性。Circle 在网络启动前铸造了 100 亿的 ARC 创世供应量，并正在探索在 2027 年从目前授权证明（Proof-of-Authority）结构向权益证明（Proof of Stake）过渡的可能性。公司表示，创世铸造不构成公开发布 ARC 代币的承诺。

Gateway's support for EURC and cirBTC remains one of the next interoperability steps announced. Circle did not provide a release date, and its September 23 Arc document continued to list both assets as "imminent" status with a unified balance.