repay

params of yAssetParams -> (list(op), storage upd)

Return amount of debt, in underlying token of yToken token by tokenId.

Underlying token must be approved before calling this operation for an amount.

If amount is 0n than all user borrow set as repay value.

The yToken contract expects that underlying token info of tokenId and all borrowed by user before tokenIds are updated by calling PriceFeed.getPrice and updateInterest in the same block before this contract method

Types

type yAssetParams       is [@layout:comb] record [
  tokenId                 : nat; // yToken token Id
  amount                  : nat; // amount tokens to repay
]

Parameter	Type	Description
tokenId	nat	yToken identifier
amount	nat	amount of underlying tokens to repay

Usage

🌮 Taquito

const tokenId = 0; // or new BigNumber(0) or "0"
const amount = 10_000_000; // amount of underlying tokens.
const yupana = await tezos.contract.at(yTokenAddress);
const proxy = await tezos.contract.at(proxyAddress);
const borrowedTokenIds = [1, 2]; // user borrowed tokens
const updBorrowed = borrowedTokenIds.reduce(
  (batch, tokenId) => {
    batch.push({
        kind: "transaction",
        ...yupana.methods.updateInterest(tokenId).toTransferParams(),
      },
      {
        kind: "transaction",
        ...proxy.methods.getPrice([tokenId]).toTransferParams(),
      });
      return batch;
    }
const batchArray = [
      ...updBorrowed,
      {
        kind: "transaction",
        ...yupana.methods.updateInterest(tokenId).toTransferParams(),
      },
      {
        kind: "transaction",
        ...proxy.methods.getPrice([tokenId]).toTransferParams(),
      },
      {
        kind: "transaction",
        ...yupana.methods.repay(tokenId, amount).toTransferParams(),
      },
    ];
const batch = await tezos.wallet.batch(batchArray);
const operation = await batch.send();
await operation.confirmation();

🐍 Pytezos

token_id = 0
amount = 10_000_000 # amount of underlying tokens.
yupana = ContractInterface.from_michelson(code) # or client.contract(contract_address)...
proxy = ContractInterface.from_michelson(prx_code) # or client.contract(prx_contract_address)...
borrow_ids = [1, 2] # user borrowed tokens
borrow_updates = [yupana.updateInterest(borrow_token_id) for borrow_token_id in borrow_ids]
borrow_updates.append(proxy.getPrice([borrow_token_id for borrow_token_id in borrow_ids]))
call = pytezos.bulk(
        *borrow_updates,
        yupana.updateInterest(token_id),
        proxy.getPrice([token_id]),
        yupana.repay(token_id, amount)
    ).autofill().sign()
opg = call.inject()

Errors

burnAmount = amount * token.totalSupply / token.liquidity

• yToken/cant-repay-more-than-borrowed - when user wants to repay more than nedeed.

• underflow/totalBorrowsF - total borrows less than amount.

• token/cant-get-contract-token - FA12 token contract address does not contain transfer entrypoint from FA12 interface.

• token/cant-get-contract-fa2-token - FA2 token contract address does not contain transfer entrypoint from FA2 interface.

• yToken/exceeds-allowable-redeem - raised when outstanding borrow value greater than max collateral value.

• ceil-div-error - division of two numbers fails.

• yToken/need-update - token price and interest not updated (see warning above)

• yToken/yToken-undefined - token identifier is not assigned to any known yTokens.