ASTR: Evolving into a CCIP-Superchain ERC-20 asset

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:gear: ASTR Token Implementation on Soneium with Chainlink CCIP and ERC-7802 Compatibility

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Hello Astar Developers and Community :waving_hand:

We’re excited to share a major technical milestone in Astar’s journey toward full interoperability. As part of Astar Evolution Phase 1.5, the Astar Foundation has deployed a new smart contract for ASTR that supports Chainlink’s Cross-Chain Interoperability Protocol (CCIP) and Optimism’s SuperchainERC20 (ERC-7802) standard.

This upgrade transforms ASTR into a cross-chain native token, allowing seamless transfers across Astar, Soneium, and the broader Superchain ecosystem. Below, we break down the full scope of this implementation and how it advances Astar’s interoperability strategy.

:globe_with_meridians: From Astar to Soneium: A New Chapter in Interoperability

Astar’s mission has always been to connect everyone to Web3. With the launch of Soneium, a Layer 2 blockchain built on Optimism’s OP Stack in collaboration with Sony and Startale Labs, we are enabling true cross-chain utility for ASTR.

To achieve this, Astar has integrated Chainlink CCIP as the secure messaging bridge and adopted the ERC-7802 standard to allow ASTR to move freely between chains without fragmentation or wrapping.

Now, ASTR can be used on both Astar Network (for governance, gas, and dApp Staking) and Soneium (for gaming, DeFi, and social), while remaining one unified token.

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:link: Embracing Chainlink CCIP and SuperchainERC20

This isn’t just about creating a bridge, it’s about aligning with emerging industry standards. ERC-7802 defines a minimal, standardized interface for cross-chain token transfers, using two functions: crosschainMint() and crosschainBurn(). These are called by authorized bridge contracts to safely move tokens between chains.

Benefits of ERC-7802 and Chainlink CCIP include:

  • :counterclockwise_arrows_button: No wrapped tokens or duplicated liquidity
  • :locked_with_key: Unified token logic with strong access controls
  • :flashlight: Transparent event tracking for cross-chain mints and burns
  • :link: Canonical token contracts across OP Stack chains like Base, OP Mainnet, and Soneium

This approach gives ASTR a future-proof foundation to scale across the broader Superchain.

:test_tube: Inside the ASTR Smart Contract on Soneium

The engineering team at Astar and Startale has developed a fully upgradeable ERC-20 contract that integrates:

:white_check_mark: ERC-7802 Interface Implementation

  • Implements crosschainMint() and crosschainBurn() functions
  • Emits standardized events (CrosschainMint, CrosschainBurn)
  • Compatible with any Superchain-compliant bridge infrastructure

:link: Chainlink Token Pool Integration

  • Utilizes Chainlink’s Burn/Mint token pools
  • Ensures only Chainlink’s router contracts can initiate minting or burning
  • Enables secure and auditable cross-chain transfers

:locked_with_key: Role-Based Access Control

  • Uses OpenZeppelin’s AccessControl and Ownable
  • Restricts mint/burn functions to authorized bridges only
  • Prevents unauthorized manipulation of token supply

:shield: Comprehensive Testing and Audit

  • Full suite of unit tests (ERC-20 behavior, mint/burn, upgrades)
  • Security audit by Cyfrin, covering all cross-chain mechanics
  • Fully open-source and publicly available for review and contributions

:magnifying_glass_tilted_left: Explore the source code: Astar ERC-7802 Repo

:locked_with_key: View audit: Cyfrin Report (Dec 2024)

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:broken_chain: The Future of ASTR as a Cross-Chain Token

By adopting Chainlink CCIP and SuperchainERC20, ASTR is evolving into a truly interoperable token that can serve as a unified asset across chains, ideal for developers building dApps in gaming, DeFi, identity, and more.

For developers:

  • Start integrating ASTR as a cross-chain token in your dApps
  • Leverage the ERC-7802 interface for consistent bridging logic
  • Build with confidence on both Astar and Soneium, knowing ASTR behaves consistently

For users:

  • You can already bridge ASTR from Astar to Soneium via the Astar Portal
  • Enjoy using your tokens across multiple chains without worrying about wrapped assets or loss of functionality

:books: References & Resources

:busts_in_silhouette: Get Involved

This is just the beginning. As Astar continues expanding across chains, we invite builders, researchers, and community members to test, contribute, and provide feedback.

Join the conversation here in our forum, explore the code, and help us build the future of Web3, interconnected, efficient, and secure. :astr:

6 Likes
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I feel very excited as I recognize that this project is steadily realizing the original vision of Astar Network.

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This is a wonderful development.

It is similar to Polkadot’s token teleportation, the Superchain (OP Stack ecosystem) version. LayerZero’s OFT is a similar standard. In a multi-chain ecosystem, secure and hassle-free token transfers are important, and this update will help achieve that.

2 Likes
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I am very happy that ASTR is the first ERC 20 SUPERTOKEN and that it will soon be able to be used across the entire OP superchain. Astar and ASTR are truly great examples of interoperability and seeing a token born from Polkadot and evolve by expanding its use across Soneium & the OP Superchain is truly a great achievement.

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Maybe a native liquid staking token as well?

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This is something that is not currently being considered. The main goal is to carry out the development and expansion of the ASTR token within the OP ecosystem. Using CCIP means this will translate into real liquidity transfer, which will be directly beneficial for ASTR itself and a significant advancement for our ecosystem.

Let’s stay tuned for future announcements.

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ASTR as the first ERC-20 SUPER TOKEN is a big step for its evolution. I am happy to see the continuous changes and implementations in the superchain.
I am of the opinion that ASTR needs soneium as soneium needs ASTR :star::handshake:t2::optical_disk:

2 Likes
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The fact that ASTR is multichain is a great milestone, and is its raison d’être since its birth, it gives pride to know that the development continues, and that it goes in the direction of making ASTR easier to use for users and developers.

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I am delighted that $ASTR has become more compatible with the superchain ecosystem. This was a necessity in order to promote ASTR to more people. If we want to participate in many Superstack-style campaigns or if we are eligible, we must first be prepared in terms of infrastructure. It is gratifying to see this happening!

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This is a major step forward for ASTR and cross-chain interoperability—great work by the team!

It’s an exciting upgrade, but real adoption metrics will be key to measure its impact.

Also, are there any marketing initiatives planned to raise awareness and drive usage of this new functionality?

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Hello, @Matt!

This is a collaborative strategy between the Chainlink team, Optimism, and us. We’re continuing to work with them to promote the use of this technology and will share new updates about this collaboration in the future.