Circle Enlists BlackRock, Visa, Mastercard to Validate Its Arc Blockchain

Circle’s Q2 Profit and the Unveiling of Arc

Circle delivered mixed second-quarter results: $701 million in revenue, a 7% year-on-year increase, and a return to net profit of $48 million, compared with a loss of $482 million a year earlier. The earlier loss was heavily distorted by one‑off stock‑based compensation tied to its 2025 listing. USDC in circulation rose 19% to $73.3 billion, and transfer volumes across blockchains hit $14.8 trillion — a 151% jump. Yet more than 95% of Circle’s revenue, roughly $668 million, came from interest on the reserves that back USDC. The rest, from payments, subscriptions and tech services, amounted to only about $34 million.

Now the company is betting on a major shift. Circle will open its own Layer‑1 blockchain, Arc, to the public on 16 September 2026. Arc is purpose‑built for stablecoin and institutional payments. Transactions are paid for in USDC — not a volatile token like ether — with settlement promised in under a second. Privacy features allow participants to shield transaction details, and the network is compatible with Ethereum development tools, easing migration for existing applications.

The network’s initial set of validators reads like a roll‑call of financial infrastructure: BlackRock, Visa, Mastercard, the Depository Trust & Clearing Corporation (DTCC), Standard Chartered, Intercontinental Exchange (ICE), Global Payments, MoneyGram, Galaxy, Sumitomo Corporation and SBI Group, alongside Circle itself. BlackRock plans to place its tokenized money‑market fund BUIDL on Arc. The DTCC intends to connect a tokenisation service to Arc, aiming to represent securities held in its systems on the chain, with integration targeted for the second half of 2027. More than 100 companies already participate on the private mainnet ahead of the public launch.

Why Institutional Validators Transform Circle’s Strategy

A Revenue Model Hinging on the Fed

Circle’s business remains a rate‑arbitrage machine. With USDC fully backed by short‑term Treasuries, repos and cash, the company collects the interest. In the second quarter, the average yield on those reserves slipped to about 3.5%, down 66 basis points year‑on‑year, and the increase in USDC only partly offset the decline. This concentration — roughly 95% of revenue from reserve income — makes Circle extraordinarily sensitive to Federal Reserve policy. When rates fall, the buffer shrinks; when rates rise, it widens. The model becomes even more precarious because Circle doesn’t keep all that interest. It pays massive sums to distribution partners: in Q2, distribution, transaction and other direct costs consumed $412 million, roughly 59% of every dollar of gross income. The biggest beneficiary is Coinbase, which shares revenues based on USDC balances held on its platforms.

Arc’s Permissioned Design: A Trade‑Off for Institutional Trust

Arc employs Proof of Authority rather than an open competition of miners or stakers. Validators are pre‑approved entities — a structure less decentralized than Bitcoin or Ethereum, but one that offers clear legal accountability and operational control. For banks, payment networks and regulators, knowing exactly who runs the infrastructure is far more palatable. It also solves a stubborn blockchain pain‑point: gas fees paid in volatile tokens. On Arc, every fee is priced in USDC, giving treasurers predictable costs for millions of transactions — a critical feature for budgeting and audit trails.

The Validator Roster as Anchor Clients

The line‑up is more than a marketing coup; each name represents a specific use case. BlackRock’s BUIDL fund brings a regulated, yield‑bearing asset onto the same ledger as the settlement currency — USDC — letting institutions move cash and collateral seamlessly. The DTCC, which cleared $4.7 quadrillion in securities transactions in 2025, provides the bridge to traditional post‑trade infrastructure. Visa, Mastercard and Global Payments tie Arc into card‑based and merchant‑settlement flows. Standard Chartered anchors cross‑border banking corridors. By making these firms validators, Circle turns them into stakeholders with a vested interest in Arc’s stability and success, while simultaneously locking them in as early adopters.

From a Token on Others’ Rails to an All‑in‑One Stack

Until now, Circle depended on Ethereum, Solana and other networks to circulate USDC. It earned nothing from the transaction fees those blockchains collected. Arc changes that. Circle can now capture network fees, build native wallet and compliance tools, and offer services such as artificial‑intelligence‑based payment routing directly on its own infrastructure. The move also promises to reduce the economic drain of partner distributions: if more USDC activity shifts to Arc, Circle may recapture part of the 59% of revenue it currently hands to third‑party distributors. The pivot is a classic platform play — own the currency, the rails and the service layer — that could fundamentally alter Circle’s profit structure from passive interest income to transaction‑driven revenue.

What Arc Means for Payments, Asset Management and USDC’s Future

• For Circle’s distribution partners, especially Coinbase: monitor whether Arc redirects USDC transaction volumes away from existing blockchains, potentially reducing the base on which revenue‑sharing fees are calculated. A sustained migration could pressure the lucrative distribution contracts that currently absorb 59% of Circle’s gross income.
• For institutions exploring tokenized assets: Arc is likely to become a live sandbox. Watch for the on‑chain volume of BUIDL and for any new instruments that appear once the DTCC integration begins in 2027. The ability to hold tokenized funds and the settlement currency on the same ledger may trim operational costs for treasury management.
• Payment networks: Visa and Mastercard are now chain validators, signalling serious roadmaps for stablecoin settlement. Merchants and acquirers should ask their payment providers about timelines for USDC‑based rails and whether Arc will be part of their infrastructure.
• Circle’s Q3 2026 earnings will be the first gauge after Arc’s public launch. Look for any uptick in non‑interest revenue — subscriptions, services or network fees — and for management commentary on active wallets and transaction volumes on Arc. A shift away from raw interest dependency would validate the diversification thesis.
• Regulatory preparation: a blockchain operated by a consortium of regulated giants may invite scrutiny from competition and financial‑stability authorities. Institutions participating should ensure robust compliance frameworks and be ready to address questions about market concentration and the systemic role of a permissioned, dollar‑pegged network.