• Direct fiat-to-L2 onboarding

• L2 bridges

• L2 compatible wallets

• L2 dApps

• App-specific rollups

• More info

Direct fiat-to-L2 onboarding

coinbase.com has integrated with Arbitrum and Optimism

kraken.com has integrated with Arbitrum

crypto.com has integrated with Arbitrum

binance.com has integrated with Arbitrum

kucoin.com has integrated with Arbitrum

huobi.ma has integrated with Arbitrum and Optimism

bybit.com has integrated with Arbitrum and zkSync

argent.xyz has integrated with zkSync

layerswap.io [Coinbase, Binance, Huobi, Okex, Kucoin] → [Arbitrum, Optimism, zkSync, Boba]

go.ramp.network/zkSync direct fiat to zkSync

global.transak.com direct fiat to Arbitrum and Optimism (not yet available in the US)

zksync.banxa.com, arbitrum.banxa.com, optimism.banxa.com direct fiat to zkSync, Arbitrum, Optimism (not yet available in the US)

L2 bridges

hop.exchange [mainnet, Arbitrum, Optimism] → [mainnet, Arbitrum, Optimism]

xpollinate.io [mainnet, Arbitrum, Optimism] → [mainnet, Arbitrum, Optimism]

cbridge.celer.network/#/transfer [mainnet, Arbitrum, Optimism, Boba] → [mainnet, Arbitrum, Optimism, Boba] "gas on arrival" feature - you will always receive some gas tokens when your asset arrives on the other chain.

synapseprotocol.com [mainnet, Arbitrum, Optimism, Boba] → [mainnet, Arbitrum, Optimism, Boba]

anyswap.exchange [mainnet, Arbitrum, Boba] → [mainnet, Arbitrum, Boba]

mosaic.composable.finance [mainnet, Arbitrum] → [mainnet, Arbitrum]

app.orbiter.finance [mainnet, Arbitrum, zkSync] → [mainnet, Arbitrum, zkSync] Only USDC is supported.

across.to [Arbitrum, Optimism] → mainnet

portr.xyz mainnet → Optimism

li.finance [mainnet, Arbitrum, Optimism] → [mainnet, Arbitrum, Optimism] app.fund.movr.network [mainnet, Arbitrum, Optimism] → [mainnet, Arbitrum, Optimism] These two projects cross L2s and swap for other tokens, so you can exchange ETH on mainnet for DAI on Optimism; it’ll find the cheapest route for you.

L2 compatible wallets

Metamask - Arbitrum, Optimism Coinbase Wallet - Arbitrum, Optimism Argent - zkSync Argent X - StarkNet Rainbow - Arbitrum, Optimism Frame - Arbitrum, Optimism zkSync - zkSync Numio - zkSync imToken - zkSync, Arbitrum Trust Wallet - Arbitrum Coin98 - Arbitrum

L2 dApps

Arbitrum - portal.arbitrum.one

Optimism - optimism.io/apps/all

zkSync - zksync.community/t/links-to-applications-making-use-of-zksync/15 You can also donate to projects on Gitcoin via zkSync. You can also use Argent to buy, earn, stake, and trade on zkSync.

StarkNet - starknet-ecosystem.com

Boba - boba.network/ecosystem (scroll down)

Another way to see available dApps is to go to DeFi Llama and filter by the L2 you’re interested in. This may not include the newest dApps, but you can see the TVL in the most popular ones.

For DAOs, the most popular DAO tool Gnosis Safe supports Arbitrum.

App-specific rollups

These are specialized layer 2 rollups that do not support general purpose smart contracts.

dYdX - dydx.exchange Loopring - loopring.org (L2 wallet and direct fiat onramp available now) ZKSwap - zks.org ImmutableX - immutable.com Deversifi - deversifi.com Sorare - sorare.com Aztec - aztec.network

More info

A rollup-centric ethereum roadmap, by Vitalik Buterin ethereum-magicians.org/t/a-rollup-centric-ethereum-roadmap/4698

Writings of @epolynya, who pushed the concept of modular blockchains into the mainstream polynya.medium.com

Comparisons between L2s (TVL, types of risks) l2beat.com

L2 fees l2fees.info

The ultimate guide to L2s on Ethereum, by @DCbuild3r mirror.xyz/dcbuilder.eth/QX_ELJBQBm1Iq45ktPsz8pWLZN1C52DmEtH09boZuo0

The Grand Design, by @sassal0x thedailygwei.substack.com/p/the-grand-design-the-daily-gwei-335

Fractal Scaling: From L2 to L3, by StarkWare medium.com/starkware/fractal-scaling-from-l2-to-l3-7fe238ecfb4f

I only included live L2s - will update as more L2s go live.

Please reach out to @ethmaxitard if you have any suggestions. (I threw this together at the @CodelessCon codeless web3 hackathon!)