Circle opens the mainnet of its own blockchain, Arc, to the general public on this September 16, 2026. For you as an investor, exactly one thing changes for now: an additional entry will grad
Circle opens the mainnet of its own blockchain, Arc, to the general public on this September 16, 2026. For you as an investor, exactly one thing changes for now: an additional entry will gradually appear in the withdrawal menus of exchanges and in the network lists of wallets, and it lets you send USDC. Before you click that entry for the first time, four points are worth a checking look: the network data, the fee model, the bridge and the address.
Here they are in order, with measured figures instead of announcement prose. We queried the chain ourselves on the morning of the opening rather than retelling press releases.
Arc is a standalone blockchain built by Circle, the company that issues the dollar stablecoin USDC. A layer 1 is a blockchain that settles its transactions itself and needs no other chain beneath it. That sets Arc apart from rollups such as Arbitrum or Base, which draw their security from Ethereum and whose price you can follow on our Ethereum price prediction.
The distinctive part sits in the fuel. On almost every other chain you pay the network fee in a fluctuating currency: in ETH on Ethereum, in SOL on Solana, in BNB on BNB Chain. Anyone wanting to move stablecoins there always needs two assets, the stablecoin and the fuel. Arc asks for both in the same unit. The gas token is the asset a chain uses to pay for its computation, and on Arc that asset is USDC.
In practice this means the balance you bring onto the chain is also what pays for forwarding it. The familiar annoyance of holding funds on a chain and being unable to move them for lack of fuel disappears.
Circle is visibly aligning the chain with institutions. The trade outlet crypto.news names eleven founding validators, among them BlackRock, DTCC, Visa, Mastercard, Standard Chartered and SBI Group; the validators are selected by Circle at first, and according to the same report a move from the authority procedure to a stake procedure is still only on the roadmap. If you hope for decentralization in the sense of an open validator set, do not expect it today.
If you enter Arc into a wallet by hand, you need four details. Circle lists them in the network overview of the Arc documentation: network name Arc, chain ID 5042, RPC endpoint https://rpc.mainnet.arc.io, currency symbol USDC.
The chain ID is the value that matters here. It is the identification number a wallet uses to identify a chain unambiguously, and it is folded into every signature. A transaction signed for chain ID 5042 is valid on no other chain. That is exactly why a transposed digit at this point is not a cosmetic flaw but the reason a transfer fails without a word.
We did not take the value from the documentation. We asked the chain itself. The mainnet endpoint answered the eth_chainId call with 0x13b2, hexadecimal for 5042. Documentation and running network therefore agree.
One point you should know before relying on the official block explorer: the host explorer.arc.io named in the documentation redirected our request at 03:57 UTC on September 16 to a Cloudflare Access sign-in page. For you that means a transaction cannot readily be looked up in public there at the moment. If you want to prove that a transfer arrived, query the chain directly through the RPC endpoint for now, or wait until a freely accessible explorer is available.
Wallets are designed on the assumption that the fuel of an EVM chain is called ETH. Circle points out explicitly in the documentation that wallets without support for custom gas tokens can still sign and send, but may under certain circumstances label the balance as "ETH" even though USDC sits underneath. So do not be alarmed if your wallet shows an ETH line after you add the network. Check instead whether the symbol can be set to USDC by hand in the network settings.
This analysis was carried out by cryptoticker.io itself on September 16, 2026. The method in one sentence: we queried the public mainnet endpoint https://rpc.mainnet.arc.io between 03:55 and 03:57 UTC with the standard calls eth_chainId, eth_blockNumber, eth_getBlockByNumber, eth_gasPrice and eth_call, and converted the raw values. One network, two blocks a hundred positions apart and four contracts were examined.
The result is surprising in one respect. The chain stood at block 21,096,586 at the time of measurement, and the genesis block carries the timestamp May 12, 2026, 00:00 UTC. So Arc does not start at zero this Tuesday. It has been running for months and is merely being opened to the general public today. That matches the statement from crypto.news that a private mainnet was already in operation with more than a hundred institutional participants.
Across a hundred consecutive blocks we measured an average spacing of 0.5 seconds. The block we opened in detail carried 23 transactions against a block limit of 30 million gas. The base fee stood at exactly 20.0 Gwei, and the price returned by eth_gasPrice was 20.000000001 Gwei.
What we could not check: the composition of the validator set, the actual distribution of balances across holders, and the question of how the fee behaves under load. The 20 Gwei are the floor named in the documentation, and a network at the bottom of its fee range is a quiet network, not a strained one.
The operation had long been running behind a closed door: on the day of the opening Arc already carries more than 21 million blocks, and the genesis block dates from May 12, 2026. The fee can be calculated directly from the measured values. A simple transfer of the network balance consumes 21,000 gas, which at 20 Gwei works out to roughly 0.00042 USDC. A standard token transfer under the ERC-20 norm sits at around 65,000 gas and therefore at roughly 0.0013 USDC. In its fee documentation Circle names a target value of about 0.001 dollars per ERC-20 transfer under normal conditions. Our calculation lands in the same order of magnitude.
The model behind it is no fixed price. By its own description Arc uses EIP-1559 with an additional smoothing step through a weighted moving average that gives recent blocks more weight than older ones. The base fee moves between a floor of 20 Gwei and a ceiling of 20,000 Gwei. In the theoretical worst case a token transfer would therefore be a thousand times more expensive than today, which still amounts to a good one dollar.
The practical consequence for you is simple: always keep a small USDC remainder on Arc. Anyone who clears the balance down to the last cent can move nothing afterwards, because the next transaction can no longer pay its own fee.
One detail causes confusion on Arc, and it is purely technical. As a token, USDC usually carries six decimal places. As a gas balance, however, Arc calculates with eighteen decimal places, because the entire EVM world is designed for that resolution. According to the documentation both views show the same balance, only at a different resolution.
So if a wallet suddenly shows you a number with twelve additional zeros or states a fee in Gwei, that is no error in your holdings. It is the gas view of the same amount. You can check it yourself: 65,000 gas times 20 Gwei gives 1.3 trillion wei, and that is 0.0013 USDC.
The contract with the ERC-20 interface sits on Arc at the address 0x3600000000000000000000000000000000000000. We queried it: the symbol reads USDC, the number of decimal places is six. At the time of measurement the contract reported a circulating supply of 373,811,829.11 USDC. That is the figure with which the chain enters its public phase.
Here lies the point that affects you first in daily use. A new chain does not appear automatically in your exchange's withdrawal menu. Every provider has to connect, test and enable it independently, and experience shows that takes weeks to months. Until then you simply cannot withdraw USDC to Arc there.
Check this concretely instead of assuming it: open the USDC withdrawal form at your provider and read the network list. If Arc is not in it, the direct route is closed. Anyone who regularly moves between chains should know which networks their provider supports in any case; our crypto exchange comparison lists the providers along with their deposit and withdrawal routes.
A second point concerns the opposite direction. A deposit from Arc to an exchange also works only if the provider knows the chain. If you send USDC over Arc to a deposit address intended for Ethereum, the balance lands at an address your provider does not watch on that chain. The credit never appears, and whether the amount can be retrieved depends solely on whether the provider controls the key to that address on the foreign chain.
As long as the exchanges are missing, the route runs through Circle's own transfer procedure. CCTP stands for Cross-Chain Transfer Protocol and works on a burn-and-mint basis: your USDC is destroyed on the source chain, and after a confirmation Circle issues the same amount anew on the target chain. That is the decisive difference from classic bridges, where a contract collects the deposits and issues a wrapped representation. If such a pooled vault falls victim to an attack, the representation is worthless. With CCTP there is no pool that could be drained.
What you pay are two network fees, once on the source chain for the burn and once on Arc for the issuance. Anyone coming from Ethereum pays Ethereum prices on the source side. Anyone coming from a cheap rollup chain stays in the cent range. The waiting time depends on the confirmation threshold; Circle's guide for the route from Ethereum to Arc describes the fast mode and the regular route via full confirmation separately from each other.
CCTP numbers chains not with the chain ID but with an identifier of its own, the domain. Arc carries number 26 there. The associated contracts on Arc read 0x28b5a0e9C621a5BadaA536219b3a228C8168cf5d for the TokenMessenger and 0x81D40F21F12A8F0E3252Bccb954D722d4c464B64 for the MessageTransmitter. If an interface shows you a different domain or divergent contracts while bridging, stop and compare with the documentation.
One distinction, so that nothing gets mixed up: the shutdown of the first CCTP version, which we described in our piece on the shutdown of the USDC bridge CCTP V1, concerns older applications on existing chains. Arc has been connected to the second version from the start. These are two separate processes that merely share the same name in the headline.
Same address, different standard: a 0x address exists on every EVM chain, but your balance is reachable only where the counterparty knows the network. Arc is EVM compatible. Your receiving address there looks as it does on Ethereum, on Arbitrum and on Polygon: 42 characters beginning with 0x. That sameness is convenient and at the same time the cause of most losses when switching networks, because the address on its own says nothing about which chain you are currently on.
Three checks protect you from that, and together they cost less than a minute. First: compare the chain selected at the top of your wallet with the chain named in the counterparty's withdrawal menu. Second: send a small amount ahead and wait for the credit before the rest follows. Third: with a wallet address, check whether you hold the private key yourself. With an address in your own custody you reach your balance on any EVM chain by adding the network afterwards. With an exchange address that does not apply, because there the provider decides which chains it watches.
This calculation is a good occasion to put your own custody in order. Anyone holding their own keys can add a new chain at any time and loses nothing if a provider never supports it; which devices come into question is set out in our hardware wallet comparison. Also reckon with the fact that a bridge transaction is not credited by the second: the waiting time depends on how many confirmations the source chain demands before release.
For investors in Germany a second contract is more interesting than the dollar one. Alongside USDC, Arc also carries EURC, Circle's euro stablecoin, at the address 0xbEf5f6d51CB62b58e6A8f77868681825C6fe21c1. Our query on September 16 returned a circulating supply of 5,555,685.86 EURC. For comparison: the dollar holding on the same chain stood at a good 373 million in the same minute. The euro is therefore still a footnote on Arc.
Legally the same applies to both tokens as everywhere else. Circle issues USDC and EURC in the EU through an e-money institution licensed in France; both are therefore e-money tokens within the meaning of the European crypto regulation MiCA. This status attaches to the issuer and its licence, not to the chain a token currently sits on. The fact that USDC now also exists on Arc changes nothing about your redemption claim against Circle.
What the status explicitly does not cover is the chain itself. MiCA regulates the issuer and the service providers, not the technical infrastructure. If a validator consortium does not include a transaction or the chain comes to a standstill, e-money status will not help you. Which issuers are licensed in the EU at all is set out in the public MiCA register of the European supervisor; Circle appears there with its French licence, while many well-known names do not.
A new chain attracts pages promising a free allocation within hours. Stick to what is documented: on the project page and in the documentation Circle names USDC as the network's gas token. Circle does not advertise there an allocation of a network token of its own to retail investors. A possible coordination asset for validators and governance has been reported on since the spring, and Circle itself has so far described its own position as under review.
In practice that means any page holding out to you a claim to an Arc token today and demanding a wallet connection, a signature or an approval for it is unsubstantiated to begin with. The classic sequence consists of obtaining an approval over your holdings by deception. Safe handling: do not connect your main wallet at all, check unknown providers against BaFin's company database, and give announcements weight only once they appear on the issuer's official channels.
A switch between two chains is no sale as long as the same asset remains under your own control. You are not swapping USDC for something else, you are moving the same claim to a different place. The case is different if you actually swap while bridging, say a euro stablecoin for a dollar stablecoin. That is a disposal, and we have gathered the details on it in our piece on stablecoins and taxes.
What matters for your records is traceability. With the burn-and-mint procedure the trail ends on the source chain and begins anew on the target chain. Two transactions, two timestamps, no visible connection unless someone documents it. So when bridging, note the transaction identifier on both sides, the date and time, the amount and the interface used. Without that assignment, tax software can later book the process as an inflow out of nowhere and impute to you an acquisition without acquisition costs.
That the acquisition data are preserved lies in your responsibility. Since the start of 2026 providers have reported holdings and transactions automatically to the tax administration, yet a bridge transaction between two self-custodied addresses does not appear in that report.
For most investors there is no pressure to act today. Anyone holding USDC on an exchange or on Ethereum need do nothing; nothing about your holdings changes because a further chain exists. If you nevertheless want to use the new chain, proceed in this order:
(As of September 16, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)
