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Ink
Ink is Kraken's dedicated DeFi blockchain, built on the OP Stack (Optimism's open-source rollup framework) and operating as an optimistic rollup anchored to Ethereum. It bundles transactions off-chain and posts compressed proofs to Ethereum for final settlement, delivering 1-second block times, sub-cent fees, and full EVM equivalence. Ink is a member of the Superchain, sharing cross-chain messaging infrastructure with Base, Worldchain, Soneium, and 29+ other OP Stack chains.
| General | |
|---|---|
| Developer | Kraken (Payward Inc.) |
| Type | EVM-compatible L2 (optimistic rollup) |
| Stack | OP Stack (Optimism) |
| Chain ID | 57073 |
| Native Currency | ETH |
| License | MIT (OP Stack) |
| Documentation | docs.inkonchain.com |
| GitHub | inkonchain/node |
| Block Explorer | explorer.inkonchain.com |
Core Features
- EVM equivalence: any Solidity contract that deploys on Ethereum deploys on Ink without modification.
- 1-second block times: with sub-second block production in active development.
- Sub-cent transaction fees: significantly lower cost than Ethereum mainnet.
- EIP-7702 support: compatible with Ethereum's account abstraction improvements.
- Superchain interoperability: cross-chain communication with Base, Soneium, Worldchain, and 29+ chains.
- Self-hosted nodes: run your own Ink node via the open-source node repository.
Network Information
Mainnet:
| Parameter | Value |
|---|---|
| Chain ID | 57073 |
| RPC (HTTPS) | https://rpc-gel.inkonchain.com |
| RPC (WSS) | wss://rpc-gel.inkonchain.com |
| Alternate RPC | https://rpc-qnd.inkonchain.com |
| Block Explorer | https://explorer.inkonchain.com |
Testnet (Ink Sepolia):
| Parameter | Value |
|---|---|
| Chain ID | 763373 |
| RPC (HTTPS) | https://rpc-gel-sepolia.inkonchain.com |
| Alternate RPC | https://rpc-qnd-sepolia.inkonchain.com |
| Block Explorer | https://explorer-sepolia.inkonchain.com |
Developer Tooling
- Smart contract frameworks: Foundry, Hardhat, and Remix are all documented and supported.
- Client libraries: Ethers.js v6 and Viem (with
inkSepoliachain config) work out of the box. - Blockscout Explorer API: REST and GraphQL available at explorer.inkonchain.com/api-docs.
- Third-party RPC: QuickNode and dRPC support Ink with higher-throughput paid tiers.
- Testnet faucet: available for testnet ETH to fund development and testing.
Tools and Resources
- Ink Documentation: network info, developer guides, and tooling reference.
- Ink Node: run a self-hosted Ink node.
- Block Explorer: Blockscout-based explorer with API access.
- Ink Docs GitHub: open-source documentation repository.
- Builder Program: grant opportunities for projects building on Ink.
Ecosystem and Integrations
- Member of the Optimism Superchain, sharing cross-chain messaging infrastructure with Base, Soneium, and Worldchain.
- Standard Web3 tooling (MetaMask, Foundry, Hardhat) works immediately with Ink's public RPC endpoints.
- Kraken's centralized exchange infrastructure integrates with Ink to let Kraken users bridge assets to DeFi without relinquishing custody.
Connect to Ink mainnet at https://rpc-gel.inkonchain.com (Chain ID: 57073) and start with the Ink documentation to deploy your first contract.
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