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What Is a Credit Support Annex (CSA)?

A CSA is a legally binding document that forms part of the ISDA Master Agreement. It governs the terms of collateral exchange between two parties in an OTC derivatives transaction.

It specifies the types of collateral accepted, the valuation methodology, the thresholds for posting collateral, and the timing of margin calls. The CSA is the risk management heart of an uncleared OTC trade.

What Is the Significance of an ISDA Master Agreement in Traditional Prime Brokerage, and Does an Equivalent Exist in Crypto?
What Are the Primary Differences between an ISDA Master Agreement and a Traditional Futures Account Agreement?
Can Two Private Parties Agree to MTM Terms in a Forward Contract?
What Are the Primary Differences between the ISDA Master Agreement and the GMRA (Global Master Repurchase Agreement)?