> For the complete documentation index, see [llms.txt](https://docs.callput.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.callput.app/options-education/options-basics-for-crypto-traders.md). # Options basics for crypto traders This page builds the minimum mental model required to understand every strategy that appears later in this section. ## QUICK ANSWER * a crypto option is a contract tied to an underlying such as `BTC` or `ETH` that gives one side optionality and the other side obligation * a call gives upside exposure above a strike and a put gives downside exposure below a strike * buyers pay premium for asymmetric payoff, while sellers receive premium in exchange for taking the other side of that payoff * on Callput, these concepts map directly to `Buy Call`, `Sell Call`, `Buy Put`, `Sell Put`, and the vertical spreads built from them ## WHAT IS A CRYPTO OPTION? An option is a contract that gives one side a right linked to an underlying asset and gives the other side an obligation tied to that right. The right is defined by a few core terms: * the `underlying`, such as `BTC` or `ETH` * the `strike`, which is the reference price written into the contract * the `expiry`, which is the final time boundary for the contract * the `premium`, which is the price paid for the option exposure At the most basic level: * a call gives exposure to upside above a strike * a put gives exposure to downside below a strike ## Why traders use options Options are used for three broad reasons. ### Directional exposure A trader expects price to move and wants a structure that pays asymmetrically if that move happens. Examples: * buy a call to express upside with limited upfront loss * buy a put to express downside with limited upfront loss ### Hedging A trader already holds exposure somewhere else and wants to reduce downside or reshape payoff. Examples: * buy a put to protect spot or vault inventory * use `Sell Call` when you want to collect premium while posting underlying-backed call exposure ### Yield or premium collection A trader believes implied volatility or option prices are rich relative to expected realized movement and wants to collect premium. Examples: * sell a put when willing to take bullish risk in exchange for income * sell a spread to collect credit with defined risk ## WHAT IS THE DIFFERENCE BETWEEN A CALL AND A PUT? ### Call A call gains value when the underlying rises relative to the strike. The higher the underlying moves above the strike, the more valuable the call becomes at expiry. ### Put A put gains value when the underlying falls relative to the strike. The lower the underlying moves below the strike, the more valuable the put becomes at expiry. ## Buyers and sellers Every option has two economic sides. ### Buyer The buyer pays premium to obtain optionality. The buyer's defining feature is limited initial loss. If the trade fails, the buyer can lose the premium paid, but not more than that from the option contract itself. ### Seller The seller receives premium in exchange for taking the other side of the option payoff. The seller's defining feature is obligation. If the option finishes in a way that favors the buyer, the seller bears that payoff. This creates a basic asymmetry: * buyers pay known cost for uncertain upside * sellers receive known income in exchange for uncertain downside ## Long and short do not mean bullish and bearish by themselves In options, `long` and `short` describe whether you own or have written optionality, not just whether your directional view is up or down. Examples: * a `long call` is bullish * a `long put` is bearish * a `short put` is usually mildly bullish * a `short call` is usually bearish or neutral, but it also carries risk if the market rallies sharply Always think in two steps: 1. what side of the option do I own or write 2. what market condition benefits that structure ## Strike and expiry are not small details Two options on the same underlying can behave very differently because of strike and expiry. ### Strike Strike determines where the option begins to matter most. For calls: * lower strikes are more expensive but more responsive * higher strikes are cheaper but need a larger rally For puts: * higher strikes are more expensive but more protective * lower strikes are cheaper but need a larger drop ### Expiry Expiry determines how much time the trade has to work. More time usually means: * higher premium * slower time decay per day * more opportunity for the underlying to move Less time usually means: * lower premium * faster time decay * more dependence on immediate timing ## Premium is the price of optionality Premium is what the buyer pays and the seller receives at entry. That premium reflects several things at once: * where spot is relative to strike * how much time remains * how volatile the market is expected to be * how expensive the market makes that particular exposure One of the biggest beginner mistakes is to treat premium as a fee. It is not a fee. It is the market price of the payoff profile you are buying or selling. ## The two questions every option trader should ask Before choosing any structure, answer these two questions: 1. What path do I expect for the underlying price? 2. What payoff shape do I want if I am right, wrong, or only partially right? Spot and perps answer the first question well. Options answer both. ## Crypto-specific framing Crypto options are still options. The core concepts do not change. What changes is the environment: * underlying assets can move sharply in short periods * implied volatility can reset quickly * traders often think in scenarios around events, regime shifts, or directional bursts * settlement, collateral, and execution conventions can differ from equity broker workflows That is why crypto traders often use options not just for hedging, but for expressing views on both direction and volatility. ## How this maps to Callput On Callput, the public strategy surface is built around: * single-leg calls and puts * vertical spreads That means the most important first-principles concepts for Callput users are: * call versus put * buyer versus seller * strike selection * expiry selection * premium versus collateral You do not need to memorize every strategy ever invented. You do need to understand what risk you are buying or selling. ## SEE ALSO * [CRYPTO OPTIONS CONTEXT](/crypto-options-context.md) * [OPTION PAYOFFS, VALUE, AND THE GREEKS](/options-education/option-payoffs-value-and-the-greeks.md) * [OPTIONS STRATEGY CHEAT SHEET](/options-education/options-strategy-cheat-sheet.md) * [INSTRUMENTS, STRATEGIES, AND COLLATERAL](/traders/instruments-strategies-and-collateral.md)