SPX box spread quotes
Market data for borrowing or investing cash through box spreads on SPX
Data source: CBOE Complex Order Book
Box spreads
What are SPX box spreads?
Box spread uses a combination of four options to create a fixed payoff at a future date when the options expire. Market participants use it to borrow and invest cash at competitive rates. It is often used with S&P 500 Index (SPX) Options.
Box spreads
What are SPX box spreads?
Box spread uses a combination of four options to create a fixed payoff at a future date when the options expire. Market participants use it to borrow and invest cash at competitive rates. It is often used with S&P 500 Index (SPX) Options.
Box spreads
What are SPX box spreads?
Box spread uses a combination of four options to create a fixed payoff at a future date when the options expire. Market participants use it to borrow and invest cash at competitive rates. It is often used with S&P 500 Index (SPX) Options.
Data source
What is CBOE Complex Order Book?
CBOE Complex Order Book (also known as spread book) is where all four legs of SPX box spreads trade as a whole with tight bid-ask spread. For most retail investors, it is a black box. We open up this black box by publishing real-time quotes in easy-to-understand formats.
Data source
What is CBOE Complex Order Book?
CBOE Complex Order Book (also known as spread book) is where all four legs of SPX box spreads trade as a whole with tight bid-ask spread. For most retail investors, it is a black box. We open up this black box by publishing real-time quotes in easy-to-understand formats.
Data source
What is CBOE Complex Order Book?
CBOE Complex Order Book (also known as spread book) is where all four legs of SPX box spreads trade as a whole with tight bid-ask spread. For most retail investors, it is a black box. We open up this black box by publishing real-time quotes in easy-to-understand formats.
View market data for:
Loan duration
Annualized interest rate
Expiration date
Note about interest rate calculation: "annualized interest rate" displayed on this website is calculated with daily compounding, and 360 is used as the number of days in a year to match the convention used by other broker-dealers. Please note that boxtrades.com calculates their interest rates differently, using a linear (non-compounded) method.
Loan duration
Loan duration
Loan duration
Annualized interest rate
Annualized interest rate
Annualized interest rate
Note about interest rate calculation: "annualized interest rate" displayed on this website is calculated with daily compounding, and 360 is used as the number of days in a year to match the convention used by other broker-dealers. Please note that boxtrades.com calculates their interest rates differently, using a linear (non-compounded) method.
About us
What is SyntheticFi?
We are an SEC-registered investment advisor that specializes in box spread strategies.
Looking to borrow with a box spread, or have general questions?
156 2nd St, Suite 610
San Francisco, CA 94105
(628) 800-0898
Backed by
SyntheticFi LLC is an investment advisor registered with the U.S. Securities and Exchange Commission (SEC). SyntheticFi does not provide tax, legal or accounting advice. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for, tax, legal or accounting advice. You should consult your own tax, legal and accounting advisors before engaging in any transaction. Investing carries inherent risks, and investment outcomes are not guaranteed unless stated otherwise. Before adopting any investment strategy, we strongly recommend consulting with a qualified financial advisor and/or tax professional.
All interest rate and tax information is current as of 1/2/2026 and reflects SyntheticFi’s best market estimates. Rates shown are indicative only; SyntheticFi does not guarantee execution at the quoted implied interest rates.
*Rates displayed are illustrative and subject to market changes. Not including SyntheticFi's fees.
†The interest rate and tax deduction savings interactive tool is for illustrative purposes only. Calculations assume interest rate savings equal to 2% of the loan amount and potential tax savings equal to 1% of the loan amount. Actual savings may vary based on market conditions, loan structure, tax circumstances, and individual client eligibility. Savings estimates are based on generalized assumptions and do not constitute tax, legal, or investment advice. Users should consult with their own financial or tax advisors to assess the applicability of any savings in their personal circumstances. This tool does not recommend or favor any specific investment and does not evaluate or compare a universe of alternative lending or investment options. Other financial solutions not analyzed here may offer similar or greater benefits.
‡APR, or the Annual Percentage Rate, disclosed above is calculated in accordance with the federal Truth in Lending Act (Regulation Z) guidelines and reflects the estimated total cost of borrowing, inclusive of the maximum fees charged by SyntheticFi that is subject to discount. This is not a rate guarantee. This APR represents the nominal interest rate annualized over monthly compounding periods and incorporates all mandatory periodic payments and final payoff obligations associated with the loan.
We are committed to full transparency and compliance; this rate enables an apples-to-apples comparison with other financing options by including both interest and applicable service fees in accordance with regulatory standards.
You can check the background of SyntheticFi LLC on the website of the SEC. Please refer to our Form CRS and Firm Brochure for important disclosures.
By using syntheticfi.com, you accept our Terms of Use and Privacy Policy.
156 2nd St, Suite 610
San Francisco, CA 94105
(628) 800-0898
Backed by
SyntheticFi LLC is an investment advisor registered with the U.S. Securities and Exchange Commission (SEC). SyntheticFi does not provide tax, legal or accounting advice. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for, tax, legal or accounting advice. You should consult your own tax, legal and accounting advisors before engaging in any transaction. Investing carries inherent risks, and investment outcomes are not guaranteed unless stated otherwise. Before adopting any investment strategy, we strongly recommend consulting with a qualified financial advisor and/or tax professional.
All interest rate and tax information is current as of 1/2/2026 and reflects SyntheticFi’s best market estimates. Rates shown are indicative only; SyntheticFi does not guarantee execution at the quoted implied interest rates.
*Rates displayed are illustrative and subject to market changes. Not including SyntheticFi's fees.
†The interest rate and tax deduction savings interactive tool is for illustrative purposes only. Calculations assume interest rate savings equal to 2% of the loan amount and potential tax savings equal to 1% of the loan amount. Actual savings may vary based on market conditions, loan structure, tax circumstances, and individual client eligibility. Savings estimates are based on generalized assumptions and do not constitute tax, legal, or investment advice. Users should consult with their own financial or tax advisors to assess the applicability of any savings in their personal circumstances. This tool does not recommend or favor any specific investment and does not evaluate or compare a universe of alternative lending or investment options. Other financial solutions not analyzed here may offer similar or greater benefits.
‡APR, or the Annual Percentage Rate, disclosed above is calculated in accordance with the federal Truth in Lending Act (Regulation Z) guidelines and reflects the estimated total cost of borrowing, inclusive of the maximum fees charged by SyntheticFi that is subject to discount. This is not a rate guarantee. This APR represents the nominal interest rate annualized over monthly compounding periods and incorporates all mandatory periodic payments and final payoff obligations associated with the loan.
We are committed to full transparency and compliance; this rate enables an apples-to-apples comparison with other financing options by including both interest and applicable service fees in accordance with regulatory standards.
You can check the background of SyntheticFi LLC on the website of the SEC. Please refer to our Form CRS and Firm Brochure for important disclosures.
By using syntheticfi.com, you accept our Terms of Use and Privacy Policy.
156 2nd St, Suite 610
San Francisco, CA 94105
(628) 800-0898
Backed by
SyntheticFi LLC is an investment advisor registered with the U.S. Securities and Exchange Commission (SEC). SyntheticFi does not provide tax, legal or accounting advice. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for, tax, legal or accounting advice. You should consult your own tax, legal and accounting advisors before engaging in any transaction. Investing carries inherent risks, and investment outcomes are not guaranteed unless stated otherwise. Before adopting any investment strategy, we strongly recommend consulting with a qualified financial advisor and/or tax professional.
All interest rate and tax information is current as of 1/2/2026 and reflects SyntheticFi’s best market estimates. Rates shown are indicative only; SyntheticFi does not guarantee execution at the quoted implied interest rates.
*Rates displayed are illustrative and subject to market changes. Not including SyntheticFi's fees.
†The interest rate and tax deduction savings interactive tool is for illustrative purposes only. Calculations assume interest rate savings equal to 2% of the loan amount and potential tax savings equal to 1% of the loan amount. Actual savings may vary based on market conditions, loan structure, tax circumstances, and individual client eligibility. Savings estimates are based on generalized assumptions and do not constitute tax, legal, or investment advice. Users should consult with their own financial or tax advisors to assess the applicability of any savings in their personal circumstances. This tool does not recommend or favor any specific investment and does not evaluate or compare a universe of alternative lending or investment options. Other financial solutions not analyzed here may offer similar or greater benefits.
‡APR, or the Annual Percentage Rate, disclosed above is calculated in accordance with the federal Truth in Lending Act (Regulation Z) guidelines and reflects the estimated total cost of borrowing, inclusive of the maximum fees charged by SyntheticFi that is subject to discount. This is not a rate guarantee. This APR represents the nominal interest rate annualized over monthly compounding periods and incorporates all mandatory periodic payments and final payoff obligations associated with the loan.
We are committed to full transparency and compliance; this rate enables an apples-to-apples comparison with other financing options by including both interest and applicable service fees in accordance with regulatory standards.
You can check the background of SyntheticFi LLC on the website of the SEC. Please refer to our Form CRS and Firm Brochure for important disclosures.
By using syntheticfi.com, you accept our Terms of Use and Privacy Policy.
SyntheticFi LLC is an investment advisor registered with the U.S. Securities and Exchange Commission (SEC). SyntheticFi does not provide tax, legal or accounting advice. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for, tax, legal or accounting advice. You should consult your own tax, legal and accounting advisors before engaging in any transaction. Investing carries inherent risks, and investment outcomes are not guaranteed unless stated otherwise. Before adopting any investment strategy, we strongly recommend consulting with a qualified financial advisor and/or tax professional.
All interest rate and tax information is current as of 1/2/2026 and reflects SyntheticFi’s best market estimates. Rates shown are indicative only; SyntheticFi does not guarantee execution at the quoted implied interest rates.
*Rates displayed are illustrative and subject to market changes. Not including SyntheticFi's fees.
†The interest rate and tax deduction savings interactive tool is for illustrative purposes only. Calculations assume interest rate savings equal to 2% of the loan amount and potential tax savings equal to 1% of the loan amount. Actual savings may vary based on market conditions, loan structure, tax circumstances, and individual client eligibility. Savings estimates are based on generalized assumptions and do not constitute tax, legal, or investment advice. Users should consult with their own financial or tax advisors to assess the applicability of any savings in their personal circumstances. This tool does not recommend or favor any specific investment and does not evaluate or compare a universe of alternative lending or investment options. Other financial solutions not analyzed here may offer similar or greater benefits.
‡APR, or the Annual Percentage Rate, disclosed above is calculated in accordance with the federal Truth in Lending Act (Regulation Z) guidelines and reflects the estimated total cost of borrowing, inclusive of the maximum fees charged by SyntheticFi that is subject to discount. This is not a rate guarantee. This APR represents the nominal interest rate annualized over monthly compounding periods and incorporates all mandatory periodic payments and final payoff obligations associated with the loan.
We are committed to full transparency and compliance; this rate enables an apples-to-apples comparison with other financing options by including both interest and applicable service fees in accordance with regulatory standards.
You can check the background of SyntheticFi LLC on the website of the SEC. Please refer to our Form CRS and Firm Brochure for important disclosures.
By using syntheticfi.com, you accept our Terms of Use and Privacy Policy.