Why two stablecoins on different networks never swap at exactly one to one even in calm markets

05 September 2026

Two stablecoins on different blockchain networks almost never swap at exactly one to one because each network’s stablecoin has its own supply, demand, and liquidity pool that are independent from the other. Even when both are designed to track the same underlying dollar value, the exchange rate between them reflects the separate market conditions on each chain.

The fundamental reason: isolated liquidity

A stablecoin on Ethereum, for example, is not the same asset as a stablecoin on Solana. They are separate tokens issued by the same organisation but existing in distinct ecosystems. Each has its own trading pairs, its own holders, and its own pool of buyers and sellers. A swap between them is not a direct exchange but a two-step process: the exchanger sells one token on its native chain, then buys the other on the destination chain. The price at each step is set by local supply and demand.

In calm markets, the difference is small - often a fraction of a percent. But it never vanishes entirely. Arbitrageurs could theoretically bring the rates closer, but they must pay network fees, bridge fees, and bear the risk of confirmation delays. Those costs create a natural band within which the swap price can drift without triggering a correction. The band is narrower on high-volume networks with cheap fees and wider on slow or expensive ones.

The role of the exchanger’s margin

The exchanger you use is not a charity. It adds a spread to every swap, which covers its operational costs, liquidity provider fees, and profit. That spread is rarely symmetrical. The rate to convert USDC from Arbitrum to USDT on BNB Chain will differ from the reverse direction. The exchanger may also adjust the rate dynamically based on its own inventory - if it holds too much of one stablecoin on a particular chain, it may price that side slightly worse to discourage swaps that would increase the imbalance.

Network-specific quirks

Some stablecoins on certain networks trade at a persistent slight discount or premium because of structural factors. A network with a congested mempool or high gas fees may see its stablecoin quote a few basis points lower, since moving it out is costly. Conversely, a network with a popular DeFi protocol that demands a particular stablecoin can push its price above the dollar peg relative to other chains. These deviations are normal and not signs of a depeg.

When the calm is not calm

Even in a market with no major news, liquidity can thin unexpectedly. A large withdrawal from a bridge, a failed transaction that ties up capital, or a validator outage on one network can cause a temporary gap. The swap rate you see is a snapshot of that moment. By the time your transaction confirms, the rate may have shifted.

What this means for your swap

If you are moving between stablecoins on different networks, expect to lose a small percentage - typically 0.1% to 0.5% in calm conditions. The exact cost depends on the networks, the tokens, and the current liquidity depth. You cannot avoid it; you can only minimise it by choosing routes with deep pools and by avoiding peak congestion times.

For a fuller picture of how these mechanics interact with volatile assets, see the hub page Swapping into and out of stablecoins. It covers the trade-offs you face when moving between a crypto asset and a stablecoin, and how the same isolated-liquidity principle applies there too.

Back to wallet fixes