The Stablecoin Float Calculator: How Much Revenue Are You Leaving on the Table?
Let's skip the preamble and get to the number that matters.
If your business processes payments — or holds customer funds for any length of time — you have float. Float is money sitting in your pipeline. It's there for hours, days, sometimes weeks. And right now, it's earning you almost nothing.
Your bank pays 0.3-0.5% APY on those balances. Maybe 1% if you've negotiated hard. Meanwhile, the same dollars converted to USDC could earn 4-8% APY through institutional-grade yield strategies backed by US Treasuries.
That gap is money you're leaving on the table. Every single day.
We're going to do the math together. By the end of this post, you'll know your exact number — and you'll probably be annoyed that you didn't do this sooner.
Understanding Your Float
Before we calculate yield, let's make sure we're measuring the right thing.
Float is the average amount of money sitting in your accounts at any given moment between receipt and disbursement. It's not your monthly volume — it's the balance that's constantly "in transit."
Here's a simple way to estimate it:
Average float = Monthly volume x (Average hold time / 30)
If you process $10M per month and funds sit in your accounts for an average of 5 days before being disbursed:
Average float = $10M x (5/30) = $1.67M
That $1.67M is your yield-bearing base. It's always there — as one batch settles out, the next batch flows in. It's a perpetual balance.
Different business models have very different float profiles:
Payment processors: 2-5 days of float (settlement delay)
Neobanks: Continuous float (customer deposits)
Marketplaces: 5-14 days of float (seller payout cycles)
Lending platforms: 30-90 days of float (loan principal in pipeline)
Payroll platforms: 1-3 days of float (payroll funding to disbursement)
Insurance tech: 30-90 days of float (premium collection to claims)
The longer the hold time and the larger the volume, the bigger the opportunity.
The Core Math: Yield at Scale
Here's where it gets real. The tables below show annual yield at different float levels and APY rates. We're comparing against a baseline of 0.5% APY (a typical bank deposit rate).
Annual Yield by Average Float Size
Average Float | Bank (0.5% APY) | Conservative (4% APY) | Moderate (6% APY) | Aggressive (8% APY) **$1M** | $5,000 | $40,000 | $60,000 | $80,000 **$5M** | $25,000 | $200,000 | $300,000 | $400,000 **$10M** | $50,000 | $400,000 | $600,000 | $800,000 **$25M** | $125,000 | $1,000,000 | $1,500,000 | $2,000,000 **$50M** | $250,000 | $2,000,000 | $3,000,000 | $4,000,000 **$100M** | $500,000 | $4,000,000 | $6,000,000 | $8,000,000
The Delta: What You're Missing
This table shows the additional revenue you'd earn above your current bank yield:
Average Float | Delta at 4% APY | Delta at 6% APY | Delta at 8% APY **$1M** | **$35,000** | **$55,000** | **$75,000** **$5M** | **$175,000** | **$275,000** | **$375,000** **$10M** | **$350,000** | **$550,000** | **$750,000** **$25M** | **$875,000** | **$1,375,000** | **$1,875,000** **$50M** | **$1,750,000** | **$2,750,000** | **$3,750,000** **$100M** | **$3,500,000** | **$5,500,000** | **$7,500,000**
Look at your row. That's what you're leaving on the table every year.
A $10M average float earning 6% instead of 0.5% generates $550,000 in additional annual revenue. That's pure margin. No customer acquisition cost. No additional infrastructure. No headcount.
The Compound Effect: 12-Month Projections
The tables above show simple annual yield. But if you reinvest the yield (compound it), the numbers get even better. Here's what happens over 12 months with monthly compounding:
12-Month Compound Yield (Monthly Reinvestment)
Average Float | 4% APY (compounded) | 6% APY (compounded) | 8% APY (compounded) **$1M** | $40,742 | $61,678 | $83,000 **$5M** | $203,710 | $308,390 | $414,998 **$10M** | $407,420 | $616,778 | $829,995 **$25M** | $1,018,550 | $1,541,945 | $2,074,989 **$50M** | $2,037,100 | $3,083,890 | $4,149,978 **$100M** | $4,074,200 | $6,167,781 | $8,299,955
The compound effect adds roughly 1.8-3.7% to your total yield over 12 months, depending on the APY. It's not dramatic, but it's free money on top of free money.
Real-World Scenarios
Let's make this concrete with three business profiles.
Scenario 1: Mid-Size Payment Processor
Monthly volume: $15M
Average hold time: 3 days
Average float: $15M x (3/30) = $1.5M
Current bank yield: $7,500/year
Stablecoin yield at 5% APY: $75,000/year
Annual delta: $67,500
Not life-changing — but it covers the cost of implementation in year one and becomes pure profit in year two. And as volume grows, the yield scales linearly.
Scenario 2: Marketplace Platform
Monthly volume: $40M
Average hold time: 10 days (weekly seller payouts + processing)
Average float: $40M x (10/30) = $13.3M
Current bank yield: $66,500/year
Stablecoin yield at 5% APY: $665,000/year
Annual delta: $598,500
Now we're talking. Nearly $600K in new annual revenue. That's a meaningful line item. For a Series B marketplace doing $480M in annual GMV, this is accretive margin that drops straight to the bottom line.
Scenario 3: Neobank / Digital Wallet
Monthly deposits held: $80M average balance
Average hold time: Continuous (customer deposits)
Average float: $80M
Current bank yield: $400,000/year (0.5% on deposits)
Stablecoin yield at 5% APY: $4,000,000/year
Annual delta: $3,600,000
$3.6M per year. And here's the kicker — many neobanks pass a portion of this yield to customers as a competitive feature (earning them deposits), while keeping the spread. Even passing through 2% APY to customers and keeping the 3% spread on $80M generates $2.4M annually.
What About the Yield Strategies?
You're probably wondering: where does 4-8% APY come from? Is it sustainable? Is it real?
Short answer: yes, it's real. The yield comes from two primary sources.
Source 1: US Treasury Yield Pass-Through
The simplest version. US Treasuries currently yield roughly 4-4.5%. When you hold USDC in certain protocols or structured products, you're essentially getting exposure to Treasury yield on-chain. The mechanism varies — sometimes it's through tokenized Treasuries (like Ondo's USDY or Mountain Protocol's USDM), sometimes through lending markets where the borrowers are posting Treasuries as collateral.
This is the conservative tier. Lower yield, lower risk. The yield tracks the Fed Funds Rate closely.
Source 2: Lending Market Yield
DeFi lending protocols like Aave, Compound, and Morpho allow you to lend stablecoins to borrowers. Borrowers pay interest; lenders (you) earn yield. Current rates for USDC on major protocols range from 4-8% APY depending on utilization.
The borrowers are typically crypto traders using leverage, or institutions using stablecoins for short-term liquidity. The loans are over-collateralized — meaning the borrower deposits $150 worth of ETH to borrow $100 in USDC. If the collateral drops in value, the position is automatically liquidated before the lender takes a loss.
This is the moderate tier. Higher yield, slightly more risk (smart contract risk, liquidation mechanism risk). But these protocols have been running for 5+ years and have processed hundreds of billions in loans.
What We Recommend
For treasury and float management, we recommend a blended approach:
60-70% in conservative strategies (Treasury pass-through, 4-4.5% APY)
20-30% in moderate strategies (blue-chip DeFi lending, 5-7% APY)
0-10% in higher-yield opportunities (only if risk appetite allows)
Blended target: 4.5-5.5% APY with an institutional-grade risk profile.
Never put 100% of float into any single strategy or protocol. Diversification matters here just like it matters in traditional finance.
The Hidden Benefit: Growing Float
Here's something most people miss in the initial calculation. Stablecoin infrastructure doesn't just earn yield on your existing float — it can grow your float.
How?
Faster settlement attracts volume. If you can offer same-day or instant settlement to merchants (because your stablecoin rails settle in seconds, not days), you'll win business from competitors still on T+2 ACH settlement. More volume = more float.
Yield sharing attracts deposits. If you're a neobank or wallet, passing through a portion of yield to customers (say, 2-3% APY on their deposits) is a powerful acquisition and retention tool. More deposits = more float.
Cross-border capability opens new markets. Stablecoin rails work globally, 24/7. If you can serve international corridors that your competitors can't (or charge less for), you'll capture additional volume. More volume = more float.
The yield calculator above shows a static snapshot. The real business case is dynamic — stablecoin infrastructure drives float growth, which drives more yield, which funds more growth. It's a flywheel.
Cost-Benefit Summary
Let's put it all in one place for a $10M average float scenario:
Costs (Year 1)
Item | Cost Legal and compliance review | $50,000 Custody provider setup | $25,000 Engineering (3 engineers, 4 months) | $150,000 Security audit | $30,000 Ongoing monitoring (0.5 FTE) | $60,000 Custody and platform fees | $30,000 **Total Year 1 Cost** | **$345,000**
Revenue (Year 1)
Item | Revenue Yield at 5% APY on $10M | $500,000 Less: bank yield foregone (0.5%) | -$50,000 **Net New Revenue** | **$450,000**
Net Impact
Metric | Value Year 1 net gain | $105,000 Year 2 net gain (costs drop to ~$90K ongoing) | $360,000 3-year cumulative gain | $825,000
The investment is profitable in year one. By year two, it's generating 4x its operating cost. And these numbers don't account for the float growth flywheel.
Your Next Step
Find your number. Right now.
Pull your average float balance (or estimate it: monthly volume x average hold days / 30)
Find your row in the tables above
Look at the delta column at 5% APY
Ask yourself: "Do I have a good reason NOT to capture this revenue?"
If you want to go deeper on the implementation side, read our 101 guide for fintech CTOs. If you need to convince your board, grab our board pitch playbook. If you want to understand the stablecoin options, check our USDC vs USDT vs PYUSD comparison.
Or just talk to us. We'll run the numbers with you — no obligation, no pitch. Just math.
The float is already there. The yield is already there. The only thing missing is the infrastructure to connect them.
Frequently Asked Questions
Does the APY fluctuate, or is it locked in?
It fluctuates. Stablecoin yield is variable — it moves with market conditions, Fed rate decisions, and protocol utilization. Over the past two years, conservative USDC yields have ranged from 3% to 8% APY. The tables in this post use fixed rates for illustration, but your actual yield will vary month to month. The important comparison is that even at the low end (3-4%), you're earning significantly more than a bank deposit.
What's the minimum hold time for yield to make sense?
Yield accrues continuously — even holding USDC for a single day earns something. But the practical question is whether the yield earned exceeds the conversion cost (on-ramp/off-ramp fees). At current rates, the break-even is usually around 2-3 days for amounts over $100K. For smaller amounts or shorter hold times, the conversion friction eats into the yield. This is why we recommend converting a stable base of float — the portion that's always there — rather than converting every incoming dollar.
Is the yield guaranteed?
No. Nothing in finance is guaranteed — not even bank interest (banks can and do change rates). Stablecoin yield from lending markets can fluctuate daily. Yield from Treasury-backed products tracks the federal funds rate, which the Fed adjusts periodically. The risk of losing principal is separate from yield variability — in conservative strategies, principal loss risk is very low (but not zero). We always recommend treating yield projections as estimates, not commitments.
How is the yield taxed?
Yield from stablecoin strategies is generally treated as ordinary income for US tax purposes — similar to bank interest. You'll report it on your corporate tax return as investment income. The accounting is straightforward because stablecoins don't have capital gains complexity (they're always worth $1). Your tax advisor should confirm the specific treatment for your entity type and jurisdiction.
Can I withdraw at any time, or is there a lock-up?
Depends on the strategy. In DeFi lending protocols (Aave, Compound, Morpho), there's no lock-up — you can withdraw at any time, subject to protocol liquidity. In some structured products or fixed-term strategies, there may be lock-ups of 7-30 days. For float management, we always recommend strategies with instant or same-day liquidity. The whole point is that you need the funds for settlement — you can't afford to have them locked.
What if the Fed cuts rates? Does stablecoin yield drop to zero?
If the Fed cuts rates significantly, Treasury-backed stablecoin yields will fall proportionally. At a 2% fed funds rate, conservative stablecoin yields would be around 2-3% APY. At 0% (like 2020-2021), yields from Treasury exposure would be near zero. However, lending market yields have a floor above zero because borrower demand for stablecoin leverage persists regardless of the fed funds rate. Even in the zero-rate environment of 2020-2021, DeFi lending rates for stablecoins were 2-5% APY. The yield opportunity shrinks in a low-rate environment but doesn't disappear.
How does this compare to money market funds?
Great question. Institutional money market funds currently yield 4-4.5% APY — comparable to conservative stablecoin strategies. The difference is flexibility and composability. Money market funds typically require T+1 redemption, have minimum investments, and are limited to USD. Stablecoin yield strategies offer instant redemption (in most cases), work 24/7, settle on weekends and holidays, and position your infrastructure for stablecoin payments and cross-border flows. If yield is your only goal, money market funds are a fine alternative. If you're also building toward stablecoin payments infrastructure, starting with yield is the natural first step.
