You have heard that Circle is launching a blockchain called Arc, that public mainnet is dated 16 September 2026, and you want to know three things: what Arc actually is, what changes on that day, and whether it requires anything from you. Every statement below comes from material Circle has published itself. The live state of the network, once there is one worth showing, sits on our Arc hub.
What Arc is
Arc is a Layer 1 blockchain built by Circle, the issuer of USDC, for stablecoin payments, foreign exchange and tokenized assets. Circle describes it with two properties that mean something to a user rather than to a marketer: "predictable fees payable in stablecoins (starting with USDC)" and "sub-second transaction finality". The launch post is equally plain about who it is addressed to — Arc is described as being "for you if you're a developer", "a business" or "an institution".
Read that list literally. Circle's materials do not describe a retail user's place on Arc — no consumer product, no terms for an individual holder — so if you hold USDC and want to know what you personally do with Arc, the honest answer on the check date is that Circle has not published one.
What actually happens on 16 September
Arc is not born that day; it becomes public. Circle states the network is "currently in private mainnet with over 100 ecosystem and institutional builders", and that public mainnet goes live on 16 September 2026. That transition — private to public — is the entire event, and it is smaller than the word "launch" usually suggests.
What does not follow from it is that you will have a route in on the same day. A public mainnet means the chain is running and reachable. It does not mean your wallet shows Arc in its network list, that an exchange has opened deposits and withdrawals in it, or that a bridge exists to move funds there. Each is a decision by a different company, and a separate fact to observe rather than assume.
Who runs Arc, and what "permissioned" means
Circle announced a founding validator cohort of 11 organisations: BlackRock, DTCC, Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo and Visa. In the same materials Arc is called an "open L1 blockchain" that runs with a "permissioned validator set". Both halves are true at once, and the tension between them is the most useful thing to understand about the network.
"Open" refers to use: in principle anyone can send a transaction. "Permissioned" refers to block production: you do not join the validator set by staking your way in, you join it by being invited. The practical consequence: questions like who could censor a transaction or pause the chain have named answers here rather than statistical ones. Whether that reads as a feature or a defect depends on what you intend to use the chain for. We take no position; we publish the list of names.
Announced for launch, and what we verify ourselves
Circle's pressroom release names the integrations expected at launch. We reproduce them as claims: a name in a press release and a working route are different objects.
| Category | Named by Circle for launch |
|---|---|
| Wallets | MetaMask, Ledger, Binance Wallet |
| Exchanges | Kraken, Upbit |
| Custody and infrastructure | Fireblocks, BNY, Chainlink |
| DeFi and markets | Aave, Morpho, Uniswap, Aerodrome, FalconX, Galaxy, GSR, Keyrock, Nonco, XFX |
| Payments | Rain, Thunes, Wirex |
| Assets | USDC natively; BlackRock's BUIDL expected; a DTCC tokenization integration announced for a later stage, not for launch day |
Read the categories carefully; they are easy to blur. Binance Wallet is a wallet, not the exchange; the only exchanges named are Kraken and Upbit. "Expected" is Circle's word and we keep it. Until we see a wallet actually offer Arc as a selectable network, an exchange actually open deposits or withdrawals in it, and a bridge route actually exist, every line above stays in the "announced" column of the hub and none of it moves to "verified".
USDC as gas: what it changes for a holder
On nearly every chain, holding an asset is not enough to move it — you also need the network's native token to pay for the transaction. That requirement is why so many first transfers fail: funds arrive, the balance shows, and nothing can be sent because there is no gas. Arc charges fees in stablecoins starting with USDC, so someone holding only USDC can transact without acquiring a second asset first.
Circle has not published what those fees amount to in these materials, and we will not quote a figure we cannot measure on a public network. The same goes for the chain ID, RPC endpoint and block explorer: third-party lists exist, but we publish network parameters only after checking them against Circle's documentation once public mainnet is running.
The ARC token, quoted rather than summarised
Circle has published a whitepaper describing ARC as "the native coordination asset of the Arc network", covering staking and delegation toward a proof-of-stake transition, governance and fee mechanics. The same page states: "No ARC token has been launched, and any discussion of a potential ARC token is merely exploratory", and "No decision has been made regarding whether a native token for the Arc network will be developed."
We quote instead of paraphrasing on purpose. Secondary write-ups circulate issuance and sale figures lifted from that whitepaper; we do not repeat them, because the source page labels the entire subject exploratory. The fee model does not depend on the outcome: fees are described as payable in stablecoins either way.
Testnet guides circulate in airdrop communities, and people do follow them. That describes what others do, not a recommendation: no distribution, eligibility or reward rules have been announced, and no reward is promised. We do not publish eligibility checklists and do not track them.
What to do before and after the date
Nothing is urgent. There is no deposit to make, no allocation to secure and no deadline to meet, because nothing has been offered to an individual holder. The useful posture is to wait for the integrations above to become observable, and to ignore anyone framing the date as a closing window.
If the underlying question is "my USDC is sitting idle, what should it be doing", that question already has dated answers that do not depend on Arc at all — see where USDC earns on exchanges today, with the date each rate was collected.
Arc and Base, for someone who holds USDC
The comparison people reach for is Base, since both chains are closely tied to USDC. They are not the same kind of object. Base is an Ethereum Layer 2, open to everyone for years, where gas is paid in ETH and exchanges that support the network already allow withdrawals to it. Arc is a Layer 1 whose validator set is permissioned, whose fees are charged in stablecoins, and which, on the check date, no exchange in our data offers as a withdrawal network. For a USDC holder today, one is a route that exists and one is a route that is announced.
What appears on the hub by itself
We collect withdrawal fees, minimums and network statuses from exchange APIs on a fixed schedule. There is no fee table in this article, deliberately: no exchange offers the Arc network yet, and we do not build tables for routes that do not exist. The moment an exchange opens Arc for deposits or withdrawals, its fee, its minimum and its open-or-closed status appear on the Arc hub without any edit from us, next to the date the data was collected. Until then there is nothing to click there, by design.
Sources and check date
- Arc blog — Arc mainnet goes live on 16 September 2026 — status, fee model, finality, stated audience.
- Circle pressroom — founding validator cohort and integrations for Arc — validators, wallets, exchanges, custody, DeFi, payments, assets.
- ARC token whitepaper — the token's status, quoted directly.
Checked on 11 September 2026. Everything above describes the state before public mainnet. We will re-check this status after 16 September 2026 and update both this article and the hub with what we could confirm ourselves and the date we confirmed it.