Morpho on Circle's Arc network surpassed $500 million in deposits within roughly fifteen days of the Layer-1's September 16, 2026 mainnet launch, according to on-chain data from Morpho's Arc deployment. Outstanding loans stood at $189.93 million by October 2, 2026, with $500.27 million in total deposits locked across the protocol's curated markets.

How a new chain hit half a billion in two weeks

Arc is Circle's EVM-compatible Layer-1, built to host stablecoin payments, foreign exchange settlement and tokenized assets on infrastructure the stablecoin issuer controls end-to-end. Morpho Blue went live alongside Arc's mainnet, wired in as the chain's core credit primitive from day one. Launch-day deposits ranged between $150 million and $220 million, almost entirely in USDC and EURC markets backed by Circle's own stablecoins.

The deployment's rapid growth still represents a thin slice of Morpho's broader footprint. Arc's $500.27 million accounted for roughly 3% of Morpho's network-wide deposits, which totaled $16.54 billion as of early October 2026.

A single market carries the credit book

Growth was not distributed evenly. Approximately 86% of lending and borrowing on Morpho's Arc deployment sits in the cirBTC/USDC market. Utilization on that pool has hovered near 100%, meaning nearly every dollar of USDC supplied has already been borrowed out.

cirBTC is Circle's wrapped, Bitcoin-backed token. A cirBTC/USDC market lets depositors post Bitcoin-collateralized exposure and borrow dollars against it, effectively converting Arc's lending activity into a Bitcoin-collateral credit venue despite the chain's multi-currency ambitions.

Institutional curators, modest yields

The depositor base mirrors that concentration. Morpho's curated vaults on Arc are run by Steakhouse Financial and Bitwise, with top allocations from Galaxy and Keyrock yielding roughly 0.80% net APY. The curator model routes capital into pre-selected markets with defined risk parameters, a structure aimed at desks that prioritize counterparty selection over headline yield.

Circle has also disclosed institutional backing for Arc's validator set, naming BlackRock and Visa among the participants. That validator roster underwrites the trust assumption made by institutional lenders allocating capital into Arc-native vaults on day one.

Why Circle built its own credit rails

Arc extends Circle's effort to internalize the infrastructure that USDC and EURC traverse. By embedding Morpho Blue as the on-chain lending layer, Circle gives holders of its stablecoins a way to lever or lend against those balances without routing through third-party chains. The arrangement lets the issuer capture more of the economic stack attached to its stablecoin float.

The fifteen-day timeline to half a billion dollars is unusually compressed for a new chain's lending market. Most credit protocols take months to attract institutional balance sheets; Arc's pre-built vault infrastructure, curator network, and limited number of Day 1 venues compressed that ramp by concentrating flow into a single dominant market.

What to watch next

Three metrics will signal whether Arc's lending market is broadening beyond its current Bitcoin-collateral anchor:

• Total deposits extending past the $500.27 million mark set on October 2, 2026
• Outstanding loans growing beyond the $189.93 million recorded on the same date
• Activity rotating out of cirBTC/USDC into EURC pools and other asset markets

Movement on any of those three would mark a shift from a single-collateral credit pool toward the multi-currency marketplace Arc's architecture was designed to serve.