The ARB price in reais with the time of the quote, a two-way converter, and the difference between a network that works and a token that only votes.
Arbitrum (ARB): R$ 0,905777, +4,77%.
Arbitrum One is a rollup: transactions run on a machine outside Ethereum, then are compressed and written back to Ethereum as data. Because that data sits on Ethereum, anyone can rebuild the chain from it and challenge a result they think wrong. The challenge window is about a week, which is why moving money home through the native bridge takes roughly seven days unless a third-party bridge fronts it for a fee. That is the optimistic design: assume the result is right, keep a way to prove it is not. Fees fell by an order of magnitude in March 2024, when Ethereum added a cheaper place for rollups to store data.
The token pays for none of that. Gas on Arbitrum is paid in ether; ARB exists to vote in the Arbitrum DAO, which controls a very large treasury and the protocol's upgrades. It was airdropped in March 2023, one of the biggest ever, and governance began badly: the first proposal asked the DAO to approve a budget of hundreds of millions of tokens the foundation had already begun moving, and the fight forced a rewrite. Ten billion tokens exist, with a multi-year unlock for the team and early investors that is the most predictable thing on the chart. Otherwise the price follows Ethereum's scaling story and the competition from Base and other rollups.
The honest weak point is the sequencer, the single component that orders transactions: one company still runs it. When it has failed the chain has stopped — in December 2023 it took no transactions for over an hour, with shorter stalls since — and decentralising it has been on the roadmap for years. For a Brazilian the practical encounter is the same as with Polygon: the cheap network your exchange offers for moving stablecoins, where picking the wrong one on a withdrawal is the mistake that costs money. The value at the top is a CoinGecko reference averaged across exchanges, saved every half hour.
From CoinGecko, which averages the price across many exchanges, saved here by a job that runs every 30 minutes; the date and time of that quote are printed under the value. Press "Refresh rate" to fetch the current one. ARB trades every day, weekends included.
Because this is an average reference and an exchange sets its own. It quotes a buying and a selling price with a spread between them, charges a trading fee and charges again to withdraw, so a gap of a couple of per cent is ordinary.
No — you pay them in ether, the same coin Ethereum uses. ARB is a governance token with no role in making the network run. You can use Arbitrum every day without ever owning one, which is worth knowing before buying it as though it were the network's fuel.
The challenge window. Arbitrum publishes its results to Ethereum and leaves about seven days for anyone to prove one wrong; only then is the withdrawal final. Third-party bridges get round it by advancing you the money immediately and waiting out the window themselves.
Where the security comes from. Arbitrum posts its transaction data to Ethereum, so the chain can be verified and reconstructed from what is stored there. Polygon PoS is a separate chain with its own validators that checkpoints to Ethereum from time to time. Both are far cheaper than Ethereum.
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