Where Does Stablecoin Yield Come From? Follow the Payments
Stablecoin yield comes from an activity or a reward budget, not from a dollar peg itself. To understand an offer, trace two things separately: who generates the money and what rules give you a share of it. A published APR alone identifies neither.
Who pays for stablecoin yield?
Different products can use the same stablecoin while paying holders for different reasons. The following examples describe economic sources, not a ranking of safety or returns.
| Mechanism | Where the income starts | How the user receives a return |
|---|---|---|
| Stablecoin lending, such as Aave | Borrowers pay interest | Suppliers earn under the market's rate model |
| Liquidity provision, such as Uniswap | Swap users pay trading fees | Eligible active liquidity receives a share of fees |
| Sky savings through sUSDS | Aggregate Sky protocol income and surplus | The governance-set savings rate increases USDS redeemable per sUSDS |
| MEXC Earn Plus | Returns from the provider's asset deployment | Subscription terms determine the user's credited return |
MEXC's Earn Service Agreement describes Earn Plus deploying subscribed assets into products involving USDC, USDGO and other stablecoins. That explains a deployment route; it does not give each USDT subscriber direct ownership of every underlying position. The subscription agreement determines the customer's entitlement.
Why the borrower's rate is not the supplier's rate
Consider a simplified pool with 1,000,000 USDC supplied and 600,000 USDC borrowed at an unchanged 8% annual rate. Borrowers would generate 48,000 USDC of annual interest. Spread over all supplied funds, that is 4.8% before reserves, fees or other adjustments—not 8%.
This is an illustration, not a live Aave quote or its complete rate formula. It isolates utilization: how much of the supplied capital actually earns borrower interest. Aave's documentation identifies utilization and governance parameters as influences on supplier rates. Fewer loans can reduce income even if the stablecoin holds its peg.
Swap fees work differently. Uniswap's documentation links fee income to swaps and active liquidity; an out-of-range concentrated-liquidity position does not earn swap fees until it is back in range. Higher trading volume therefore does not guarantee that every liquidity position earns more. The stablecoin yield farming guide separates fees from token incentives.
Revenue must pass through distribution rules
Sky's explanation of sUSDS traces its savings yield to overall protocol income and surplus, with the savings rate set by governance. It specifically separates sUSDS from a claim on any single borrower or strategy. Users should not assume that one underlying investment's yield is passed through unchanged.
For sUSDS, savings accrue through redemption value rather than a growing token count. This means yield-bearing stablecoins can require different accounting from account rewards.
Identify bonus rewards separately
If an offer adds bonus rewards, check their eligibility conditions, principal cap and duration separately from the base return. On MEXC Futures Earn, the published maximum APR includes conditional additional rewards; a headline maximum is not the base rate applicable to every balance. Those customer-facing rules alone do not establish how each bonus is financed.
Identify the economic payer, then check the distribution rules. The simplified pool shows why a hypothetical 8% borrower rate can support only a 4.8% gross supplier rate at 60% utilization. If an offer does not disclose its income source, treat that as an unanswered question rather than inferring it from the APR.
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