# Ink data apps

> Ink is an OP Stack layer 2 built by an exchange to bring its users on-chain. Its apps cover activity, fees and the DeFi growing on it.

Markdown copy of https://voltfincrypto.com/chains/ink

## Ethereum

- [Multicall3, Permit2 and EntryPoint Addresses by Chain](https://voltfincrypto.com/apps/multicall3-permit2-entrypoint-addresses) (table, planned): Is Multicall3, Permit2 or an ERC-4337 EntryPoint deployed on a given chain, at its usual address and with the expected code?

## Layer 2s

- [EVM Chain List: Chain IDs, Native Tokens and RPC Support](https://voltfincrypto.com/apps/evm-chain-list) (table, planned): What is the chain ID and native token of each EVM chain, and which RPC methods do its public endpoints support?
- [L2 Bridge Flows: Net Deposits from Ethereum by Chain](https://voltfincrypto.com/apps/l2-bridge-flows) (dashboard, planned): Which layer 2s are gaining or losing assets through their canonical bridges with Ethereum?
- [L2 Withdrawal Times to Ethereum by Rollup](https://voltfincrypto.com/apps/l2-withdrawal-times) (dashboard, planned): How long does a native withdrawal from each layer 2 to Ethereum take right now?
- [OP Stack Chains: The Superchain List Compared](https://voltfincrypto.com/apps/op-stack-superchain-chains) (table, planned): Which chains run on the OP Stack, which belong to the Superchain and how do they compare?
- [WETH and Wrapped BTC Token Addresses by Chain](https://voltfincrypto.com/apps/wrapped-btc-eth-token-addresses) (table, planned): What is the WETH, WBTC or cbBTC contract address on each chain, and who issues or backs each one?
- [Ink Chain Stats: Activity, Gas and DeFi on Kraken's Layer 2](https://voltfincrypto.com/apps/ink-chain-stats) (dashboard, planned): How busy is Ink, how often is its gas paid in stablecoins and how much DeFi runs on it?
- [Rollup Decentralization: Upgrade Keys and Exit Windows](https://voltfincrypto.com/apps/rollup-decentralization) (table, planned): Who can upgrade each rollup's bridge contracts, and how much notice do users get before an upgrade?
- [L2 Sequencer Uptime: Block Production Gaps by Chain](https://voltfincrypto.com/apps/l2-sequencer-uptime) (dashboard, planned): Is each Ethereum layer 2 producing blocks on schedule, and when did block production last stall?

## Stablecoins

- [PYUSD Supply by Chain: PayPal USD On-Chain](https://voltfincrypto.com/apps/pyusd-supply-by-chain) (dashboard, planned): How much PYUSD circulates on each chain, and how has its supply moved?
- [USDC CCTP and USDT0 Cross-Chain Flows](https://voltfincrypto.com/apps/usdc-cctp-usdt0-cross-chain-flows) (dashboard, planned): How much USDC and USDT moves between chains through CCTP and USDT0 each day, and on which routes?

## DeFi

- [Uniswap v4 Hooks: Volume and Liquidity by Hook](https://voltfincrypto.com/apps/uniswap-v4-hooks) (table, planned): Which Uniswap v4 hooks attract the most volume and liquidity?
- [Velodrome Finance: Volume and Votes on OP Mainnet and Superchain](https://voltfincrypto.com/apps/velodrome-finance-superchain-dex) (dashboard, planned): How much trades on Velodrome across OP Mainnet and the Superchain, and how much VELO has converted to the new AERO?

## Security and risk

- [EIP-7702 Delegation Checker: Is Your Wallet Delegated?](https://voltfincrypto.com/apps/eip-7702-delegation-checker) (dashboard, planned): Is this wallet delegated under EIP-7702 on any chain, and does its delegate contract sweep incoming funds?