A crypto cash-secured put is a put option you sell while posting enough stable collateral (typically USDC or similar) to buy the asset at the strike if assigned. Buyers pay you a premium for the right to sell you the asset at that strike by expiry.
If the price stays above the strike, the put expires; you keep the premium. If the price finishes below and the put is exercised, you buy at the strike — which was your intended entry if you sized the trade that way.
Key takeaways
- You post the full purchase price in stablecoins and receive the premium up front.
- If the price finishes below the strike you buy at the strike. Your effective entry is the strike minus the premium.
- If it does not, you keep the premium and your collateral is released.
- In strong rallies the strategy earns less than holding the asset; in falling markets it has historically lost less.
The trade in plain numbers
You want to buy 5 ETH near $2,700 while the price is $3,000. You sell a put struck at $2,700, expiry one month, and post 5 × $2,700 = $13,500 USDC (plus any platform buffer).
- Premium: say $500, or $100 per ETH (illustrative: roughly what a one-month put 10% below the current price is worth when implied volatility is near 70%, where the Volmex ether index stood on 6 October 2026).
- If ETH stays above $2,700: the put expires; you keep the $500 and the USDC is unlocked.
- If ETH is below $2,700 and the put is exercised: you pay $2,700 per ETH from your collateral and receive the ETH, or settle the difference in value, depending on how the option settles.
You collect premium for accepting the obligation to buy at $2,700 even if the price is lower than that at expiry.
If you are assigned, your effective entry is $2,700 minus the $100 premium: $2,600 per ETH, about 13% below the $3,000 price on the day of the trade. If ETH is at $2,300 by then, you still pay $2,700.
Why write cash-secured puts
| Motive | Fit |
|---|---|
| Limit-buy with income | Willing to own the asset at the strike |
| Stablecoin yield with a view | Prefer premium over pure lending if you accept assignment |
| First half of the wheel strategy | After assignment, you can sell a covered call on the asset you now hold |
What it is not: unsecured leverage. “Cash-secured” means the full purchase price is set aside in advance.
Puts vs lending for stablecoin yield
Lending rates depend on how much borrowers want to borrow, and carry the risk of the lending market. Put premium depends on volatility, strike and expiry — and can end in owning a volatile asset.
If your goal is only stable income with no assignment, lending or cash instruments may fit better. If your goal is to accumulate a tokenized stock, BTC, ETH or SOL below today's price while earning premium, a cash-secured put is the trade for that. On Overcast, trading desks quote the premium and the trade settles onchain — How Overcast works. The comparison with lending and with packaged exchange products is worked through in How to earn yield on USDC by selling puts.
How to choose a strike
Start from the price you want to pay, not from the premium. A strike closer to the current price pays more and is assigned more often; a strike further away pays less and mostly expires. If owning the asset at the strike would feel like a mistake, the strike is too high.
Annualizing a premium correctly
In the example, $500 on $13,500 of collateral is 3.7% for one month. Multiplied by twelve that is about 44%. That annualized figure is useful for comparing two quotes; it is not a forecast. Premiums change with volatility and strike, and some months end in assignment instead of another collected premium.
The trade-off shows up in bull markets
The cost of selling puts is not hidden. It shows up in the years when markets rally hardest.
The longest-running benchmark is the Cboe S&P 500 PutWrite Index (PUT), which sells one-month S&P 500 puts against a Treasury bill reserve. Calendar-year returns from the Cboe factsheet:
| Year | PutWrite Index | S&P 500 |
|---|---|---|
| 2020 | 2.1% | 18.4% |
| 2022 | −7.7% | −18.1% |
| 2023 | 14.3% | 26.3% |
| 2024 | 17.8% | 25.0% |
Two things stand out. In the years it lagged, the strategy still made money; what it gave up was the part of each rally above the strike. And when the market fell in 2022, it lost less than half as much.
That is the bargain: sellers trade the best part of rallies for premium income and a cushion when things break. Whether it suits you depends less on the math than on which of those years you can sit through.
Two differences apply to a put you write yourself. The index sells at-the-money puts, while most sellers choose strikes below the current price, which lowers both the premium and the odds of assignment. And for someone holding stablecoins, the fair comparison is what those stablecoins would otherwise earn while waiting to buy, not the return of being fully invested.
Onchain vs centralized
The payoff is the same; who holds your money and how the premium is set differ. Centralized exchanges use margin accounts. Onchain, your stablecoins are locked in escrow or in a vault, and RFQ protocols quote a premium for your exact strike and size. See Onchain options explained.
Exercise style
Puts you meet in crypto are usually European-style near expiry. Confirm before trading.
Assignment — what happens
When the buyer exercises a put you sold:
- Your collateral pays for the purchase.
- You receive the asset, or its equivalent in value, depending on how the option settles.
- Premium already received stays yours.
Plan size so assignment is acceptable ownership — not an accident.
Risks
- You buy into weakness — you are assigned after a fall, and sit on a paper loss even if your long-term view holds.
- Collateral lock — stablecoins tied up for the option’s life.
- Software, platform and price-feed risk — depending on where you trade and how the option settles.
- Opportunity cost — the price never reaches your strike; you only earned premium, missed a better entry or a pure lending rate.
FAQ
What does the trade look like with stables?
Post stable collateral, sell a put at your strike, collect premium. If assigned, you buy the asset at the strike; if not, you keep the premium.
What is my effective entry if assigned?
The strike. Because you already received the premium, your effective entry is the strike minus the premium per unit. In the example above that is $2,700 minus $100, or $2,600 per ETH.
When does this beat lending?
Only if you accept that you may end up owning the asset. The comparison with lending is in How to earn yield on USDC by selling puts.
Can I write them on Overcast?
Yes — that is a core seller path. Overview: How Overcast works. Waitlist: join.
Sources
- Cboe S&P 500 PutWrite Index (PUT) factsheet, Cboe Global Indices, 31 August 2026
- Volmex implied volatility indices, Volmex, viewed 6 October 2026
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Risk disclosure and disclaimer
The content on this blog is published by Overcast for general information and education only. It does not constitute financial, investment, legal, tax or accounting advice, and it is not an offer, solicitation or recommendation to buy, sell or hold any asset or to use any product or strategy. It does not take into account your objectives, financial situation or needs. Consult a qualified professional before making any investment decision.
Writing options involves substantial risk. A covered call limits your upside and leaves you fully exposed to declines in the underlying asset. A cash-secured put can oblige you to buy an asset at a price above its market value at expiry. Premiums, yields and APRs shown are illustrative or historical, are not guaranteed and do not predict future results. Crypto assets and tokenized securities are highly volatile and may lose some or all of their value. Smart contracts may contain vulnerabilities, and onchain transactions are irreversible.
Products, assets and features mentioned may not be available in your jurisdiction. You are responsible for complying with the laws that apply to you. Information may be incomplete, contain errors or become outdated; Overcast makes no warranty as to its accuracy or completeness.
Overcast is in early access. Features, supported assets and availability described here may change before or after launch.
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