Borrow

Accounts may borrow assets from the market's supply.

Borrow positions must be collateralized with a minimum amount of collateral asset determined by the market's configuration.

Deposit collateral

To add collateral to an account's position, transfer-call the market tokens with a msg of "Collateralize":

near contract call-function as-transaction \
    <collateral-asset-contract-id> ft_transfer_call \
    json-args '{
        "receiver_id": "<market-id>",
        "amount": "<amount>",
        "msg": "\"Collateralize\""
    }' \
    prepaid-gas '100.0 Tgas' \
    attached-deposit '1 yoctoNEAR' \
    sign-as <account-id>

Withdraw collateral

The collateral withdrawal process is relatively straightforward as compared to the supply withdrawal process: simply call withdraw_collateral, passing the amount of collateral asset tokens you wish to withdraw:

near contract call-function as-transaction \
    <market-id> withdraw_collateral \
    json-args '{ "amount": "<amount>" }' \
    prepaid-gas '100.0 Tgas' \
    attached-deposit '0 NEAR' \
    sign-as <account-id>

While this process is simple, collateral can only be withdraw so long as the value of the remaining collateral continues to satisfy the market's borrow_mcr_maintenance requirement.

Borrow

Once an account's position is collateralized, borrow asset can be withdrawn.

near contract call-function as-transaction \
    <market-id> borrow \
    json-args '{ "amount": "<amount>" }' \
    prepaid-gas '100.0 Tgas' \
    attached-deposit '0 NEAR' \
    sign-as <account-id>

As long as the collateralization requirements are met, the borrow amount (minus fees) will be sent to the predecessor account.

Repay

As long as an account has a liability (principal + interest/fees), some or all of their collateral will be locked so that it cannot be withdrawn.

To unlock the collateral, the account must repay its liability to the market.

To perform a repayment, transfer-call tokens to the market with a msg of "Repay":

near contract call-function as-transaction \
    <borrow-asset-contract-id> ft_transfer_call \
    json-args '{
        "receiver_id": "<market-id>",
        "amount": "<amount>",
        "msg": "\"Repay\""
    }' \
    prepaid-gas '100.0 Tgas' \
    attached-deposit '1 yoctoNEAR' \
    sign-as <account-id>