Where stablecoin yield comes from, and why it varies

A stablecoin is built to hold a steady dollar value. Paying holders for holding it is a separate matter, covered below. When a dollar balance earns something, the earnings come from a separate activity that puts those dollars to work: borrowers paying interest, short-term US Treasuries, or loans to institutions.

This guide explains each source in plain terms, what each one depends on, and why every figure shown for it is variable. It describes mechanisms and shows no rate numbers, because a number is out of date as soon as the conditions behind it move. This guide is the starting point for the stablecoin yield topic.

Does a stablecoin pay yield by itself?

Generally no: the stablecoin and the yield product that sits on top of it are two separate things. US law defines a "payment stablecoin" as a digital asset used or designed to be used as a means of payment or settlement, whose issuer must convert, redeem or repurchase it for a fixed amount of monetary value and represents that it will keep a stable value relative to that amount. That definition comes from the GENIUS Act, Public Law 119-27, approved on 18 July 2025.

The same law addresses interest directly. Section 4(a)(11) says that no permitted or foreign payment stablecoin issuer "shall pay the holder of any payment stablecoin any form of interest or yield (whether in cash, tokens, or other consideration) solely in connection with the holding, use, or retention of such payment stablecoin."

The EU points the same way for e-money tokens. MiCA Article 50 says that issuers of e-money tokens "shall not grant interest in relation to e-money tokens", and that crypto-asset service providers "shall not grant interest when providing crypto-asset services related to e-money tokens."

This post reports what those texts say. It does not say how or when each provision applies to a given company, and it is not a legal analysis.

The practical result is that a yield product is its own product, with its own provider, terms and risks. The stablecoin is the dollar leg. The yield product is what a provider does with the dollars. In Neovestor, Earn products come from three providers: Jupiter Lend (Cash), Maple (syrupUSDC) and Ondo (USDY).

What are the main sources of stablecoin yield?

Most stablecoin yield traces back to one of three activities: borrowers paying interest into a lending pool, interest on short-term US government debt, or interest on loans to institutional borrowers. The table keeps the logic general first and then names the product that uses it.

Each row is a different kind of product, so the rates are not directly comparable. A figure from one row answers a different question from a figure in another row.

On-chain lending: borrowers pay interest

A pooled lending protocol collects deposits into a pool and lends them to borrowers, and the interest borrowers pay is what depositors earn. Aave's documentation puts it this way: "Supplier yields are funded by borrower interest net of the reserve factor," and "Interest rates adjust with utilization." Aave is cited here only as a general example of how pooled lending works. It is not a Neovestor partner.

Aave defines utilization as the share of the total pool that is currently borrowed. When a large portion of the pool is borrowed, the interest rate increases. When most of the pool is idle, it decreases.

Jupiter's developer documentation describes the same basic idea for Jupiter Lend: interest from borrowers becomes yield for depositors, and each deposit is represented by a receipt token. Jupiter describes its Lend rates as "Variable. Adjusted automatically based on supply and demand."

Treasury-linked notes: short-term government debt

US Treasury bills are short-term government debt. TreasuryDirect says bills are sold for terms from four weeks to 52 weeks, are sold at a discount or at par, and pay their face value at maturity. When a bill is bought below face value, the gap between the price paid and the face value paid at maturity is what the holder earns.

Ondo's documentation describes USDY as "a tokenized note formerly issued by Ondo USDY LLC". Depending on the issuance date, Ondo says the backing may be short-term US Treasuries, shares of the iShares Short Treasury Bond ETF, or bank demand deposits. USDY is an accumulating token: its price per token rises as yield accrues, instead of the holder receiving extra tokens.

Ondo's important notes say USDY tokens "provide their holders with economic exposure to short-term US treasuries". They also say that "a holder of tokens may incur losses, including total loss of their purchase price", and that past performance is not an indication of future results.

Institutional loans: private credit

The Federal Reserve defines private credit as "debt-like, non-publicly traded instruments provided by non-bank entities" to fund private businesses, typically on bilaterally negotiated terms. In a Fed note on its characteristics and risks, the authors add that such loans are illiquid because there is no secondary market, and that the sector is relatively opaque.

Maple's risk disclosures list two yield sources for syrupUSDC. The first is interest on overcollateralized loans to institutional borrowers, made under master lending agreements with posted collateral. The second is what Maple calls "supporting yield strategies": futures basis trading, other delta-neutral or market-neutral approaches, and liquidity provision in decentralized finance.

A syrupUSDC token represents, in Maple's words, "your proportional share of the pool's underlying assets". That makes it a share of a pool that holds loans and other strategies, rather than a single loan.

Why does stablecoin yield change from day to day?

Because each source is priced by something that moves. A rate is a snapshot of conditions at the moment it is read, and the three sources move for different reasons.

• Utilization. In a lending pool the rate rises when more of the pool is borrowed and falls when more of it sits idle (Aave).
• Supply and demand. Jupiter says its Lend rates are adjusted automatically based on supply and demand.
• Borrower performance and markets. For loan-based products, the rate follows how borrowers perform. Maple states that "the yield rate may vary and could be zero or negative in adverse market conditions" and that yields are not assured.
• Past results do not set the future. Ondo says past performance is not an indication of future results for USDY.

A small worked example, with no numbers, shows the first driver. Picture a lending pool in which most deposits are sitting idle. Few borrowers are paying interest, so less interest flows to depositors, and the rate falls. Now picture the same pool after borrowing demand rises and most deposits are lent out. More interest flows in, and the rate rises. Nothing about the stablecoin changed. The rate moved because the activity behind it moved.

This is why a rate on a screen is a reading, not a promise. No one promises a rate. The guide to reading a variable rate explains the labels (APY, APR, "rate"), why an "as of" time matters, and how to tell which number is on screen.

What can go wrong when dollars earn yield?

Several things, and they differ by source: a flaw in the code, a borrower that cannot repay, an issuer's structure, limits on withdrawals, and the absence of deposit insurance. A provider's own risk disclosures show which of these it names.

Who holds the funds is a separate question from who pays the yield. The post on custodial vs non-custodial covers that difference.

How does this look in Neovestor?

In Neovestor, Earn has three products, each run by a different provider:

• Cash is USDC lent through Jupiter Lend Earn. USDCCircle
• syrupUSDC is a token from Maple. syrupUSDCMaple
• USDY is a token from Ondo. USDYOndo

syrupUSDC and USDY are bought and sold by swap. Cash is one balance made up of idle USDC plus the Cash earn position.

Every asset screen names its issuer or counterparty, links that issuer's terms and shows jurisdiction restrictions. The first trade or deposit with each issuer requires accepting that issuer's terms. Every Earn rate is labeled variable and carries an "as of" time taken from the source.

Neovestor is a software interface to these providers' products. It does not run them, and what it shows is information, not investment advice.

Which questions help when reading any yield product?

Five questions cover most of what a provider's page can answer. They apply to any yield product, in any app.

1. Who pays the yield, and for what activity? Borrowers, a government issuer or a pool of loans each carry a different risk.
2. Who is the provider, and where are its terms and risk disclosures? A product page that names no provider leaves this question open.
3. Is the rate labeled variable, and when was it read? A rate with no "as of" time says nothing about the present.
4. How do withdrawals work? Check whether they can be limited, queued or delayed, as the table above shows.
5. Is the product open to people in your country? Providers publish their own eligibility rules, which can exclude whole groups of people.

On the last point, Maple's restricted-jurisdiction list for syrupUSDC includes the United States and Australia, and Ondo's USDY eligibility page lists US persons and Canada as prohibited. In Neovestor, availability depends on your country, and the app shows the reason when an asset is restricted.

For readers new to moving dollars into a wallet in the first place, the guide to moving USDC from an exchange to self-custody covers that step.