--- title: Vault Depositor (Option Seller) slug: vault-depositor-option-seller icon: 🤑 docTags: createdAt: 2023-03-13T08:28:48.000Z --- Option Sellers (Writers) should deposit assets as margin (collateral) to underwrite [Option Contracts](https://www.investopedia.com/terms/o/optionscontract.asp).  - **Covered Call** vault depositor = [Covered Call Seller](https://docs.typus.finance/vault-depositor-option-seller#q-Cgm) - **Call** **Selling **vault depositor = [Call Seller](https://docs.typus.finance/vault-depositor-option-seller#kGudu) - **Put Selling** vault depositor = [Put Seller](https://docs.typus.finance/vault-depositor-option-seller#bLojC) *** # Covered Call Seller A [Covered Call](https://docs.typus.finance/defi-options-vaults#18lfj) vault depositor is a covered call seller. The seller deposits the underlying assets (such as $SUI) as collateral to sell the call option and receives rewards (premium) either in underlying tokens (such as $SUI) or stablecoins (such as $USDC) after an auction ends. If the buyer decides to execute the contract as the call option expires, the underlying asset deposited by the seller will be transferred to the buyer, that is, **cash-settled in tokens**. `Example` You deposit 1 SUI to sell 1 SUI call option. - Duration: 7 days - Current market price: 1 SUI = 10 USDC - Strike price: 1 SUI = 15 USDC - Contract Size: 1 SUI Call Option - Reward: You get 0.0625 SUI before vault settlement `Case 1: When Settle Price ≦ Strike Price, you gain` If the price of SUI stays below 15 USDC when the call expires, the buyer will not execute the call. - Market price at expiry: 1 SUI ≦ 15 USDC - Strike price: 1 SUI = 15 USDC **-> not executed by the buyer** - Vault Settlement: You don’t need to transfer SUI to the buyer - Net PNL in SUI: - You get 0.0625 SUI - The buyer loses 0.0625 SUI `Case 2: When Settle Price > Strike Price, you may lose` If the price of SUI rises **slightly **to 16 USDC when the call expires, the buyer has the right to execute the call. At this time, the buyer gets 0.0625 SUI token from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 16 USDC - Strike price: 1 SUI = 15 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets \[ (16 - 15) / 16 ] =  0.0625 SUI from you - Net PNL in SUI: - You are breakeven ( 0.0625 SUI - 0.0625 SUI = 0 SUI ) - The buyer is breakeven too If the price of SUI rises **strongly **to 20 USDC when the call expires, the buyer has the right to execute the call. At this time, the buyer gets 0.25 SUI token from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 20 USDC - Strike price: 1 SUI = 15 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets \[ (20 - 15) / 20 ] =  0.25 SUI from you - Net PNL in SUI: - You lose 0.1875 SUI ( 0.0625 SUI - 0.25 SU = -0.1875 SUI ) - The buyer gets 0.1875 SUI 👉🏻 Start Earning: [Deposit](https://typus.finance/yield/) 🔎 Vault Analysis: [Check Historial Performance](https://docs.google.com/spreadsheets/d/1rK0wEayKDMJpzxYh6zs33RhyiXjPAy9vvlEfGNLOjPg/edit?usp=sharing) 📚 Read More: [Depositor Guide](https://docs.typus.finance/depositor-guide) *** # Call Seller A [Call Selling](https://docs.typus.finance/defi-options-vaults#fGueI) vault depositor is a call seller. The seller deposits stablecoins (such as $USDC) as collateral to sell the call option and receives rewards (premium) in stablecoins (such as $USDC) after an auction ends. If the buyer decides to execute the contract as the call option expires, the stablecoins deposited by the seller will be transferred to the buyer, that is, **cash-settled in stablecoins.** `Example`  You deposit 10 USDC to sell 1 SUI call option. - Duration: 7 days - Current market price: 1 SUI = 10 USDC - Strike price: 1 SUI = 12 USDC - Contract Size: 1 SUI Call Option - Reward: You get 1 USDC before vault settlement `Case 1: When Settle Price ≦ Strike Price, you gain` If the price of SUI stays below 12 USDC when the call expires, the buyer will not execute the call. - Market price at expiry: 1 SUI ≦ 12 USDC - Strike price: 1 SUI = 12 USDC **-> not executed by the buyer** - Vault Settlement: You don’t need to transfer USDC to the buyer - Net PNL in USDC: - You get 1 USDC - The buyer loses 1 USDC `Case 2: When Settle Price > Strike Price, you may lose` If the price of SUI rises **slightly **to 13 USDC when the call expires, the buyer has the right to execute the call. At this time, the buyer gets 1 USDC from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 13 USDC - Strike price: 1 SUI = 12 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets ( 13 - 12 ) = 1 USDC from you - Net PNL in USDC: - You are breakeven ( $1 - $1 = $0 ) - The buyer is breakeven too If the price of SUI rises **strongly **to 15 USDC when the call expires, the buyer has the right to execute the call. At this time, the buyer gets 3 USDC from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 15 USDC - Strike price: 1 SUI = 12 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets ( 15 - 12 ) = 3 USDC from you - Net PNL in USDC: - You lose 2 USDC ( $1 - $3 = -$2 ) - The buyer gets 2 USDC 👉🏻 Start Earning: [Deposit](https://typus.finance/yield/) 🔎 Vault Analysis: [Check Historial Performance](https://docs.google.com/spreadsheets/d/1rK0wEayKDMJpzxYh6zs33RhyiXjPAy9vvlEfGNLOjPg/edit?usp=sharing) 📚 Read More: [Depositor Guide](https://docs.typus.finance/depositor-guide) *** # Put Seller A [Put Selling ](https://docs.typus.finance/defi-options-vaults#xdS35)vault depositor is a put seller. The seller deposits stablecoins (such as $USDC) as collateral to sell the put option and receives rewards (premium) either in underlying tokens (such as $SUI) or stablecoins (such as $USDC) after an auction ends. If the buyer decides to execute the contract as the put option expires, the stablecoins deposited by the seller will be transferred to the buyer, that is, **cash-settled in stablecoins.** `Example`  You deposit 10 USDC to sell 1 SUI put option. - Duration: 7 days - Current market price: 1 SUI = 10 USDC - Strike price: 1 SUI = 8 USDC - Contract Size: 1 SUI Put Option - Reward: You get 1 USDC before vault settlement `Case 1: When Settle Price ≧ Strike Price, you gain` If the price of SUI stays above 8 USDC when the put expires, the buyer will not execute the put. - Market price at expiry: 1 SUI ≧ 8 USDC - Strike price: 1 SUI = 8 USDC **-> not executed by the buyer** - Vault Settlement: You don’t need to transfer USDC to the buyer - Net PNL in USDC: - You get 1 USDC - The buyer loses 1 USDC `Case 2: When Settle Price < Strike Price, you may lose` If the price of SUI decreases **slightly **to 7 USDC when the put expires, the buyer has the right to execute the put. At this time, the buyer gets 1 USDC from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 7 USDC - Strike price: 1 SUI = 8 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets ( 8 - 7 ) = 1 USDC from you - Net PNL in USDC: - You are breakeven ( $1 - $1 = $0 ) - The buyer is breakeven too If the price of SUI decreases **strongly **to 5 USDC when the put expires, the buyer has the right to execute the put. At this time, the buyer gets 3 USDC from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 5 USDC - Strike price: 1 SUI = 8 USDC **-> executed by the buyer** - Vault Settlement: The buyer gets ( 8 - 5 ) = 3 USDC from you - Net PNL in USDC: - You lose 2 USDC ( $1 - $3 = -$2 ) - The buyer gets 2 USDC :::hint{type="info"} Please note that stablecoins could be replaced by native tokens such as $SUI as well. ::: 👉🏻 Start Earning: [Deposit](https://typus.finance/yield/) 🔎 Vault Analysis: [Check Historial Performance](https://docs.google.com/spreadsheets/d/1rK0wEayKDMJpzxYh6zs33RhyiXjPAy9vvlEfGNLOjPg/edit?usp=sharing) 📚 Read More: [Depositor Guide](https://docs.typus.finance/depositor-guide) *** # Call Spread Seller A [Call Spread](https://docs.typus.finance/defi-options-vaults#k3Ka_) vault depositor is a call spread seller. The seller deposits the underlying assets (such as $SUI) as collateral to sell the call spread option and receives rewards (premium) either in underlying tokens (such as $SUI) or stablecoins (such as $USDC) after an auction ends. - **Vault Depositors** are selling a call at a lower strike price, and buying another call at a higher strike price, while - **Vault Bidders** are buying a call at a lower strike price, and selling another call at a higher strike price. If call buyers decide to execute the contract as the call expires, the underlying asset deposited by the seller will be transferred to the buyer, that is, **cash-settled in tokens**. `Example` You deposit 1 SUI to sell 1 SUI call spread option. - Duration: 7 days - Current market price: 1 SUI = 10 USDC - Strike price A: 1 SUI = 13 USDC - Strike price B: 1 SUI = 15 USDC - Contract Size: 1 SUI Call Spread Option - Reward: You get 0.07 SUI before vault settlement `Case 1: When Settle Price ≦ Strike Price A, you gain` If the price of SUI stays below 13 USDC when the call spread expires, the buyer will not execute the call at Strike price A and B. - Market price at expiry: 1 SUI ≦ 13 USDC - Strike price A: 1 SUI = 13 USDC **-> not executed by the buyer** - Strike price B: 1 SUI = 15 USDC **-> not executed by you** - Vault Settlement: You don’t need to transfer SUI to the buyer - Net PNL in SUI: - You get 0.07 SUI - The buyer loses 0.07 SUI `Case 2: When Strike price A < Settle Price < Strike price B, you may lose` If the price of SUI rises **slightly **to 14 USDC when the call spread expires, the buyer has the right to execute the call at Strike price A. At this time, the buyer gets 0.07 SUI token from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 14 USDC - Strike price A: 1 SUI = 13 USDC **-> executed by the buyer** - Strike price B: 1 SUI = 15 USDC **-> not executed by you** - Vault Settlement: The buyer gets \[ (14 - 13) / 14 ] = 0.07 SUI from you - Net PNL in SUI: - You are breakeven ( 0.07 SUI - 0.07 SUI = 0 SUI ) - The buyer is breakeven too `Case 3: When Settle Price ≧ Strike price B, you lose` If the price of SUI rises **strongly **to 20 USDC when the call spread expires, the buyer has the right to execute the call at Strike price A, and you has the right to execute the call at Strike price B. At this time, the buyer gets 0.10 SUI token from you. The amount is equal to the difference between the market price and the strike price at expiry.  - Market price at expiry: 1 SUI = 20 USDC - Strike price A: 1 SUI = 13 USDC **-> executed by the buyer** - Strike price B: 1 SUI = 15 USDC **-> executed by you** - Vault Settlement: The buyer gets \[ (20 - 13) / 20 ] - \[ (20 - 15) / 20 ] = 0.35 - 0.25 = 0.10 SUI from you - Net PNL in SUI: - You lose 0.03 SUI ( 0.07 SUI - 0.10 SUI = -0.03 SUI ) - The buyer gets 0.03 SUI 👉🏻 Start Earning: [Deposit](https://typus.finance/yield/) 🔎 Vault Analysis: [Check Historial Performance](https://docs.google.com/spreadsheets/d/1rK0wEayKDMJpzxYh6zs33RhyiXjPAy9vvlEfGNLOjPg/edit?usp=sharing) 📚 Read More: [Depositor Guide](https://docs.typus.finance/depositor-guide)