# Starknet data apps

> Starknet is a validity rollup that runs Cairo programs and pays fees in STRK or ETH. Its apps cover fees, activity, proofs and staking.

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

## Layer 2s

- [Ethereum Layer 2 List Ranked by Activity, Fees and Value](https://voltfincrypto.com/apps/ethereum-layer-2-list) (table, planned): Which Ethereum layer 2s are the largest by transactions, users, fees and value locked?
- [Starknet Stats: Transactions, STRK Fees and Staking](https://voltfincrypto.com/apps/starknet-stats) (dashboard, planned): How busy is Starknet, what do its STRK fees pay for and how much STRK and BTC is staked with its validators?
- [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?
- [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?