Stablecoin Economics: The Best Business Nobody Talks About

The previous article Stablecoins: The Reserve Problem explained why stablecoins are structurally fragile. This one covers the flip side: why the issuers are printing money, and what this means for the practical question of whether you should hold USDC.

The short answer to your question: USDC going to zero is a very different risk from USDC briefly depegging, and the path from crypto to actual dollars matters more than which stablecoin you use as an intermediate step.

---

The Seigniorage Model

Seigniorage is the profit that accrues to whoever issues money. When a central bank prints $100andbuysa$100 treasury bond, it earns the interest on that bond forever, while the $100 bill in circulation costs nothing to maintain. That spread is seigniorage.

Stablecoin issuers run the same trade. Consider Circle (USDC):

• You give Circle $1
• Circle gives you 1 USDC
• Circle invests that $1 in short-term US Treasuries
• Circle earns the Treasury yield — currently ~4–5%
• Circle pays you nothing

The net interest margin is 100% of the yield on the float:

$\text{Revenue}=r_f\cdot L$

where $r_f$ is the risk-free rate and $L$ is outstanding liabilities (USDC in circulation). With ~$50BinUSDCoutstandingand$r_f = 5%$:

$\text{Revenue}\approx \$50\text{B}\times 5\%=\$2.5\text{B per year}$

Circle’s cost base is modest — technology, compliance, legal, headcount. The gross margin on this business is extraordinary.

Why This Business Scales With Interest Rates

This is crucial: at zero interest rates, this business was nearly worthless. From 2020–2022 when the Fed funds rate was 0–0.25%:

$\text{Revenue}\approx \$50\text{B}\times 0.1\%=\$50\text{M per year}$

The Fed raising rates from 0% to 5% in 2022–2023 turned stablecoin issuance from a marginal activity into one of the most profitable per-employee businesses in finance. Tether reported $6.2 billion in net profit for 2023 — a company with fewer than 100 employees.

For comparison, Goldman Sachs made $8.5B in net income in 2023 with 45,000 employees. The profit-per-employee ratio isn’t comparable to anything in traditional finance.

The Depositor Gets Nothing

This is the other half of the model: holders of USDC/USDT earn zero yield. You are lending Circle your money interest-free. Circle invests it at 5% and keeps everything.

Why would anyone accept this? Because the utility of a stable, programmable, 24/7 transferable digital dollar is worth paying for — especially for DeFi protocols, crypto traders, and people in countries with unstable local currencies. You pay the spread implicitly through foregone yield.

Some newer protocols (like DAI’s sDAI, or tokenised money market funds) are beginning to pass yield through to holders. This competes directly with Circle’s model. If this becomes standard, stablecoin issuers will need to share the float income — compressing margins dramatically.

---

Tether vs USDC: The Practical Risk Hierarchy

You asked: can USDC be worth nothing? Let’s be precise about what “worth nothing” means, because there are three very different risks:

Risk 1 — Temporary Depeg (High Probability, Low Severity)

A brief deviation from $1duringmarketstress.ThishappenedtoUSDCinMarch2023:$3.3B of Circle’s reserves were trapped at Silicon Valley Bank when it failed. USDC traded as low as **$0.87\ast \ast onsecondarymarketsbeforetheFDICannounceditwouldcoverallSVBdeposits(includinguninsuredamounts),andUSDCrecoveredto$1 within 48 hours.

The loss if you held USDC during this period and panicked and sold at $0.87: 13%. If you held: 0%. The correct response to a depeg driven by a temporary liquidity event (not insolvency) is to hold.

Risk 2 — Partial Insolvency (Low Probability, Moderate Severity)

Circle’s reserves lose enough value that $r<1$ — say, reserves are only worth $0.92 per USDC outstanding. Redemptions are suspended or haircut. This requires either: (a) Circle was lying about reserve quality (fraud), or (b) an extreme and simultaneous collapse in US Treasury prices.

US T-bill yields would need to spike dramatically for short-duration Treasuries to lose 8% of face value. This is theoretically possible in a hyperinflationary scenario but implies a broader financial system collapse where dollars themselves are questionable.

Risk 3 — Zero (Extremely Low Probability)

USDC goes to zero means either:

• Circle is a complete fraud (reserves never existed) — regulatory oversight makes this extremely unlikely; Deloitte attestations, US money transmitter licenses, BlackRock as reserve custodian
• US Treasuries become worthless — this means the US government has defaulted and USD itself has collapsed

If USD has collapsed, your USDC problem is the least of your problems.

The Honest Comparison

	Goes to zero	Partial loss possible	Temporary depeg
Tether	Unlikely but not impossible	Plausible	Has happened
USDC	Essentially impossible	Only with T-bill collapse	Has happened
Bank deposit (FDIC)	Impossible under $250k	No	No
T-bill held directly	Impossible	No	N/A (not traded)

USDC is safer than Tether by a significant margin. But a bank deposit is safer than USDC, because FDIC insurance eliminates the bank run equilibrium entirely — exactly as Diamond-Dybvig says it should.

---

The pump.fun Cash-Out Chain

If pump.fun or anyone in the Solana ecosystem is paying you in SOL, and you want stable value, here is the full risk chain to understand:

SOL (volatile)
  → USDC on Solana (stablecoin, smart contract risk + Circle risk)
  → USDC on Coinbase (centralized exchange custodial risk)
  → USD in Coinbase account (not FDIC insured)
  → USD wire to your bank (FDIC insured up to $250k)

Each step eliminates a risk. The last step — wire to a regulated bank — is the only point at which you have the same protection as a regular dollar. Until you do that wire, you have counterparty risk somewhere in the chain.

Where the Risks Actually Sit

SOL price risk: Crypto volatility. SOL has dropped 90%+ multiple times from peak to trough. If you’re holding SOL waiting to convert, you’re running equity-like volatility on an asset with no earnings.

Smart contract risk on USDC: USDC on Solana is a token on a program. If that program has a bug or is exploited, you can lose funds even if Circle is solvent. This is separate from the reserve risk.

Exchange risk (Coinbase): Coinbase is a publicly listed company under SEC oversight. It is not FTX. But it is not a bank. If Coinbase were to fail, USD balances on the platform are not FDIC-insured and would be treated as unsecured creditor claims. In practice Coinbase is very safe; in principle this is a risk.

The practical answer: Convert to USD and wire to your bank as soon as you want stable value. The crypto → bank wire path is well-trodden and takes 1–3 business days. Don’t hold USDC as a long-term store of value when you could hold actual dollars.

---

Why Circle’s Business Model Is Sustainable (For Now)

Circle is essentially a money market fund that issues tokens instead of fund shares, pays zero yield to investors, and keeps all the interest. This works because:

1. Switching friction: Moving USDC to a yielding alternative requires leaving DeFi or on-chain infrastructure — costly for protocols

2. Network effects: USDC is the default settlement asset across most DeFi protocols; its liquidity is a moat

3. Regulatory capture as asset: Circle’s compliance spending and US regulatory relationships are a competitive advantage against less regulated competitors

4. Inertia: Traders and protocols that hold USDC as a cash buffer don’t think about the opportunity cost

The risk to Circle’s model: competitors passing yield through to holders. Ondo Finance and others are already tokenising T-bills and passing ~4.5% yield to on-chain holders. If this becomes the norm, USDC will need to compete on yield — and its margin collapses from ~5% to a spread.

---

The Macro Significance: Shadow Money

At $100B+ outstanding between USDC and USDT, stablecoins are now materially significant in the short-term credit markets. Tether alone is among the largest buyers of US Treasury bills. This creates a feedback:

• High rates → stablecoin issuance is profitable → issuers buy more T-bills
• T-bill demand from stablecoins compresses short-rate spreads
• If stablecoins face a run → forced T-bill selling → short-rate spike → liquidity crunch

The Fed and Treasury are watching this. It is one of the reasons stablecoin regulation is moving fast. A $200B stablecoin run would be a significant systemic event in short-term funding markets — not because USDC goes to zero, but because the fire sale of T-bills would ripple through money markets.

---

Questions to Test Understanding

1. At 5% Fed funds rate, Circle earns roughly $2.5Bannuallyon$50B in USDC. If the Fed cuts to 1%, what happens to Circle’s revenue? What would they need to do to maintain profitability?

2. You receive 100 SOL at $150/SOL=$15,000. SOL then drops 60%. You convert to USDC. USDC then briefly depegs to $0.92. You convert to USD at your bank. What is your final dollar value? Which step caused the most damage?

3. Tether reported $6.2Bnetprofitin2023with100employees.GoldmanSachsreported$8.5B with 45,000 employees. What does this comparison reveal about where the value in the financial system is being captured, and why might this be temporary?

4. Why does the phrase “USDC going to zero” conflate two completely different risk scenarios? What would each scenario require to be true?

5. A new protocol offers “yield-bearing USDC” that passes 4.5% to holders. It holds the same T-bill reserves as Circle. From a risk perspective, is this more or less safe than regular USDC? From Circle’s perspective, why is this existential?