USDm, the native stablecoin built into layer-2 network MegaETH, has collapsed to roughly $18 million in circulation, down more than 95% from a peak near $600 million in May, according to a new report from research firm Castle Labs. The decline tracks closely with falling usage of the MegaETH chain itself, since USDm's supply is largely a function of how much activity the network is generating rather than an independent stablecoin adoption story.
USDm is a white-labeled stablecoin built in collaboration with Ethena, with reserves deposited into BlackRock's BUIDL fund to earn a near-SOFR yield on the chain's stablecoin float. That structure means the yield generated by USDm reserves — Castle Labs estimates roughly $650,000 annually at the current $18 million supply and a SOFR rate near 3.6% — flows back into MegaETH token buybacks and burns. As the stablecoin supply shrinks, that revenue stream shrinks with it, tightening a mechanism the chain had built to support its own token economics.
A Business Model Tied to Chain Activity
The arrangement illustrates a structural risk that is becoming more visible across newer layer-2 networks that have tried to build native revenue streams around their own stablecoins: when the model works, rising chain usage and rising stablecoin supply reinforce each other, but the same mechanism runs in reverse just as fast once activity cools. USDm's supply doubled and then some on the way up, crossing $500 million within weeks of MegaETH's mainnet launch, before giving back nearly all of that growth as usage faded in the months since.
Part of a Rougher Stretch for Synthetic Dollars
USDm's contraction lands in the same week that another synthetic dollar, Neutrl's NUSD, suspended redemptions entirely after an undisclosed reserve issue affected the token — a reminder that newer stablecoin designs built on yield-bearing collateral or chain-specific revenue mechanics carry risks that traditional fiat-backed stablecoins generally don't. Both cases underscore the same point: a stablecoin's peg is only as durable as the economic activity or reserve management propping it up, and neither is guaranteed to hold once usage or trust starts to slip.
