Arc went from announcement to live mainnet in just over a year — fast for any Layer-1, remarkable for one carrying BlackRock, Visa, and Mastercard as validators. This is the definitive dated record of how it happened and what's committed next, maintained as a living page: new milestones are appended as they occur, with the stamp below showing the last pass.
LIVING PAGE — last updated: September 2026. New milestones are appended at the next weekly pass after they occur.
The record so far
August 2025 — Circle announces Arc. The USDC issuer reveals it is building its own Layer-1: a chain where USDC is the gas token, finality is sub-second, and the design center is stablecoin finance — payments, FX, treasury, tokenized assets — rather than general-purpose speculation. The strategic logic: USDC needed a home optimized for it instead of renting blockspace on general-purpose chains (what is Arc).
October 28, 2025 — Public testnet goes live. Chain ID 5042002, USDC gas via Circle's faucet, Arcscan explorer, EVM compatibility from day one. The testnet becomes the rehearsal space for everything that follows (testnet guide).
May 2026 — The ARC whitepaper, and a reported raise. Circle publishes a whitepaper describing an exploratory "coordination asset" — staking, economic governance, fee mechanics, and a proof-of-authority-to-proof-of-stake transition — while explicitly making no launch commitment. No token launches; none has since. The same month, press reports (CoinDesk) a ~$222M raise tied to the Arc token sale at a ~$3B valuation — figures attributable to press reporting, not Circle confirmation. Counterfeit "ARC" tokens begin trading almost immediately; all remain fake (the full ARC token story).
August 2026 — The founding validator cohort. Circle announces the eleven founding validators: BlackRock, DTCC, Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo, and Visa (who they are). Testnet activity passes roughly 13.5 million weekly transactions at an average fee near $0.004. Circle also names the day-one app cohort — Uniswap, Aerodrome, Aave, Morpho, MetaMask, Ledger, Kraken, Chainlink among them — and reports 100+ builders on private mainnet (the ecosystem map).
September 16, 2026 — Public mainnet. Arc opens to everyone: real USDC as gas, Malachite consensus with deterministic ~780ms finality, proof-of-authority under the eleven validators, opt-in confidential transfers. Mainnet parameters publish at launch (the launch-day page carries them).
What's committed next?
Dated, published commitments — not speculation. H2 2027 — DTCC tokenization: DTCC begins tokenizing DTC-custodied assets on Arc, the largest institutional pipeline announced for the network. Undated but published: BlackRock deploying BUIDL on Arc (explained); the proof-of-stake transition described in the whitepaper, contingent on the still-exploratory ARC asset; StableFX expansion beyond USDC, with EURC and regional stablecoins (BRL, JPY, MXN signaled) planned. Each moves from this section into the dated record above when it ships — and nothing else belongs here, however loudly rumor insists.
How to read this timeline
Context for the compression: by mid-August 2026 the testnet was processing roughly 13.5 million transactions a week at an average fee near $0.004 — meaning the network arrived at its launch date already carrying real usage rather than promising it. The validator and app announcements landed against that backdrop, which is part of why they read as commitments rather than press-release optimism: the rails were observably running before the institutions put their names on them.
Two further patterns worth noticing. The compression: fourteen months from announcement to mainnet, with the validator cohort landing only weeks before launch — Circle sequenced credibility (validators, day-one apps) to arrive exactly when the network needed it. And the discipline: every genuinely confirmed milestone traces to Circle's own publications, while the loudest Arc story of 2026 — the token — remains officially exploratory. A timeline that refuses to print rumors is also the antidote to them: if a date isn't on this page or in Circle's own channels, treat it as unconfirmed (current scam patterns exploit exactly this).
FAQ
When did Arc launch? Public testnet: October 28, 2025. Public mainnet: September 16, 2026.
When was Arc announced? August 2025, by Circle — the issuer of USDC.
Is there an ARC token launch date? No. The May 2026 whitepaper describes an explicitly exploratory coordination asset; no token has launched, no airdrop has been announced, and no date exists. Anything trading as "ARC" today is counterfeit.
What's the next big date on Arc's calendar? The firmest published commitment is DTCC tokenization beginning H2 2027. The PoS transition and StableFX currency expansion are published intentions without dates.
Where should I verify a rumored Arc announcement? arc.io and circle.com — Circle's own channels — and this page, which is updated weekly. If it's not there, it's not confirmed.
Arrived at the part of the timeline where you launch? Mint, lock, and vest on Arc with Team Finance — audited contracts, flat USDC fees.Open Team Finance →Sources: Circle pressroom, arc.io, docs.arc.network; raise figures per CoinDesk reporting, attributed as such. Dated record verified August 2026; maintained weekly.
Last verified: August 2026