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Layer 2

Arbitrum One

The largest Ethereum layer 2 by value locked, with the deepest DeFi ecosystem.

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Networks
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By the Orca Crypto teamUpdated 2026-09-28How we check this5 min readReference
The short answer

The largest Ethereum layer 2 by value locked, with the deepest DeFi ecosystem. If a DeFi protocol exists on a layer 2, it is almost certainly on Arbitrum. Liquidity is deep and the tooling is mature.

Live market data

LiveCoinGecko
Price
$0.1969
-8.95% 24h
Market cap
$1.34B
24h volume
$305.27M
Rank
#69
All time high
$2.39

Prices as of September 29, 2026, replaced by live figures as the page loads. Prices move constantly and are for orientation only.

What Arbitrum One is for

If a DeFi protocol exists on a layer 2, it is almost certainly on Arbitrum. Liquidity is deep and the tooling is mature.

Because Arbitrum One settles to Ethereum, your funds ultimately depend on Ethereum security plus the correctness of the rollup itself. That is a genuinely strong position, and it is not identical to holding on the base chain.

Technical summary

PropertyValue
LayerLayer 2
Launched2021
TypeOptimistic rollup
Settles toEthereum
Built withArbitrum Nitro

Block explorers

An explorer lets you verify any transaction, address or contract on this network yourself. Learning to read one is the fastest way to stop taking anyone's word for anything.

ArbiscanBlockscout

How to read a block explorer

Wallets that support it

MetaMaskRabbyCoinbase WalletLedger

Getting funds onto Arbitrum One

The official bridge is the safest route. Third party bridges are faster and add their own risk, which has historically been the largest source of losses in crypto.

Arbitrum BridgeHow bridges work, and their risks

What to be aware of

  • Most layer 2s currently run a single sequencer operated by one company, which can in principle reorder or delay transactions.
  • Upgrade keys are often held by a small multisig, meaning the rules can change.
  • Withdrawing through an official optimistic rollup bridge takes about seven days by design.
  • Crypto assets are volatile. Drawdowns of seventy percent or more have happened on every network in this list, including the largest.
  • Sending to an address on the wrong network can lose funds permanently. Always send a small test amount first.

Nothing on this page is investment advice. We describe how networks work, not whether you should buy anything.

Other networks at this layer

Same job, different tradeoffs. Each of these has its own page covering what it is actually for, who runs it and where it struggles.

OP MainnetPolygon PoSzkSync EraStarknetScrollLineaAll of them

Common questions

How long does an Arbitrum withdrawal take?
About seven days through the native bridge, because it is an optimistic rollup with a challenge window during which a fraudulent state can be disputed. Third party bridges front you the funds in minutes for a fee.
What is the difference between Arbitrum One and Nova?
One is the main chain, with the deep DeFi liquidity. Nova uses a different data availability setup to make transactions much cheaper, aimed at games and social apps, at the cost of a slightly weaker security assumption.

Where to go next

Compare all networksHow the layers fit together.Block explorer directoryEvery chain, every explorer.Wallets by chainThe right wallet for this network.Mining and stakingHow blocks actually get made and who gets paid.

Compared head to head

The question people actually ask is not "what is this" but "this one or that one". Each of these ends with a pick and the reasoning behind it.

Base vs ArbitrumArbitrum vs OptimismAll comparisons

New to Arbitrum One?

We can get you set up with the right wallet, funded, and through a first transaction on this network in about an hour, on a screen share.

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