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How Do I Calculate Contract Size and Minimum Trade Amount Using the /instrument Endpoint?

  • Updated

Contract sizes and minimum trade amounts are listed on the contract's Specification Page (e.g., https://www.bitmex.com/app/contract/XBTUSD). 

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However, you can calculate these values manually using the /instrument endpoint. The calculation method depends on the contract's payout type, as outlined in the Perpetual Contracts Guide and Futures Guide. You can also identify the payout type by checking the isQuanto and isInverse parameters in the /instrument endpoint response.

 

Contract Size & Minimum Trade Amount Formulas

For Inverse Contracts

Contract Size = Multiplier/underlyingToSettleMultiplier

Minimum Trade Amount = Contract Size * lotSize

 

For Linear Contracts

Contract Size = 1/underlyingToPositionMultiplier

Minimum Trade Amount = Contract Size * lotSize

 

For Quanto Contracts

Contract Size = multiplier in settlCurrency

Minimum Trade Amount = lotSize

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