Historical reference — The original USDJ/CDP system has been discontinued
This article describes the original USDJ/CDP system, which was shut down on November 17, 2025. The mechanisms and procedures described below are retained for historical reference and should not be treated as current operating instructions.
For updated fund-handling arrangements and exchange options, please refer to Updates on Handling of Funds Not Timely Returned Following USDJ System Shutdown.
When the historical stability fee was paid
Under the original USDJ/CDP mechanism, the stability fee accrued on USDJ debt and was settled when the holder repaid debt. For a partial repayment, the outstanding fee was charged in proportion to the amount of USDJ returned. Closing a CDP required repayment of all outstanding debt and settlement of the applicable stability fee.
Payment paths described in the historical documentation
The historical documentation described two payment paths. When paying the stability fee directly with JST, the wallet needed enough JST to cover the fee. The original CDP tutorial also documented a separate “Use USDJ to pay the stability fee” option, which used a smart contract to convert USDJ into JST for payment.
The USDJ option was a selected payment path in the tutorial; it should not be interpreted as an automatic fallback whenever the wallet had insufficient JST. The statement that insufficient JST would cause a payment to fail applies to direct JST payment, rather than every payment path described in the historical documentation.