addMarket

params of newMarketParams -> storage upd

Creates new token lending market.

Types

type assetType          is
| FA12 of address
| FA2  of (address * nat)

type newMetadataParams is map(string, bytes)

type newMarketParams    is [@layout:comb] record [
  interestRateModel     : address;
  asset                 : assetType;
  collateralFactorF     : nat;
  reserveFactorF        : nat;
  maxBorrowRate         : nat;
  token_metadata        : newMetadataParams;
  threshold             : nat;
  liquidReserveRateF    : nat;
]

Parameter	Type	Description
interestRateModel	address	interestRate contract instance
asset	assetType	FA12 or FA2 token
collateralFactorF	nat	collateral factor as float number multiplied by precision= 1000000000000000000n; (1e+18)
reserveFactorF	nat	reserve factor as float number multiplied by precision= 1000000000000000000n; (1e+18)
maxBorrowRate	nat
token_metadata	map(string, bytes)	token metadata packed to bytes
threshold	nat
liquidReserveRateF	nat

Usage

🌮 Taquito

const fa2TokenId = 3;
const tokenMetadata = MichelsonMap.fromLiteral({
  symbol: Buffer.from("TST").toString("hex"),
  name: Buffer.from("TEST").toString("hex"),
  decimals: Buffer.from("6").toString("hex"),
  icon: Buffer.from("someURL").toString("hex"),
});
const yupana = await tezos.contract.at(yTokenAddress);
const operation = await yupana.methodsObject.addMarket(
      {
      interestRateModel: "KT1...",
      asset: { fa12: "KT1..." } or { fa2: { 0: "KT1...", 1: fa2TokenId } },
      collateralFactorF: 650000000000000000,
      reserveFactorF: 200000000000000000,
      maxBorrowRate: 5000000000000,
      token_metadata: tokenMetadata,
      threshold: 550000000000000000
).send();
await operation.confirmation();

🐍 Pytezos

PRECISION = pow(10, 18)
config = {
  "collateral_factor": 0.5,
  "reserve_factor": 0.5,
  "threshold": 0.8
}
token = { "fA12": token_address } # or { "fA2": (token_address, token_id) }
yupana = ContractInterface.from_michelson(code) # or client.contract(contract_address)...
call = yupana.addMarket(
                interestRateModel = "KT1...",
                asset = token,
                collateralFactorF = int(config["collateral_factor"] * PRECISION),
                reserveFactorF = int(config["reserve_factor"]  * PRECISION),
                maxBorrowRate = 1_000_000  * PRECISION,
                token_metadata = {"": ""},
                threshold = int(config["threshold"] * PRECISION)
            )
opg = call.inject()

Errors

• yToken/token-has-already-been-added -this token has been added to the market already.

• yToken/not-admin - sender is not contract admin.