CRVUSD JS

Setup

Install from npm:

npm install @curvefi/stablecoin-api

Init

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    // 1. Dev
    await crvusd.init('JsonRpc', {url: 'http://localhost:8545/', privateKey: ''}, { gasPrice: 0, maxFeePerGas: 0, maxPriorityFeePerGas: 0, chainId: 1 });
    // OR
    await crvusd.init('JsonRpc', {}, {}); // In this case JsonRpc url, privateKey, fee data and chainId will be specified automatically

    // 2. Infura
    crvusd.init("Infura", { network: "homestead", apiKey: <INFURA_KEY> }, { chainId: 1 });
    
    // 3. Web3 provider
    crvusd.init('Web3', { externalProvider: <WEB3_PROVIDER> }, { chainId: 1 });
})()

Note 1. chainId parameter is optional, but you must specify it in the case you use Metamask on localhost network, because Metamask has that bug

Note 2. Web3 init requires the address. Therefore, it can be initialized only after receiving the address.

Wrong ❌️

import type { FunctionComponent } from 'react'
import { useState, useMemo } from 'react'
import { providers } from 'ethers'
import Onboard from 'bnc-onboard'
import type { Wallet } from 'bnc-onboard/dist/src/interfaces'
import crvusd from '@curvefi/stablecoin-api'

    ...

const WalletProvider: FunctionComponent = ({ children }) => {
    const [wallet, setWallet] = useState<Wallet>()
    const [provider, setProvider] = useState<providers.Web3Provider>()
    const [address, setAddress] = useState<string>()

    const networkId = 1

    const onboard = useMemo(
        () =>
            Onboard({
                dappId: DAPP_ID,
                networkId,

                subscriptions: {
                    address: (address) => {
                        setAddress(address)
                    },

                    wallet: (wallet) => {
                        setWallet(wallet)
                        if (wallet.provider) {
                            crvusd.init("Web3", { externalProvider: wallet.provider }, { chainId: networkId })
                        }
                    },
                },
                walletSelect: {
                    wallets: wallets,
                },
            }),
        []
    )

    ...

Right ✔️

import type { FunctionComponent } from 'react'
import { useState, useMemo, useEffect } from 'react'
import { providers } from 'ethers'
import Onboard from 'bnc-onboard'
import type { Wallet } from 'bnc-onboard/dist/src/interfaces'
import crvusd from '@curvefi/stablecoin-api'

    ...

const WalletProvider: FunctionComponent = ({ children }) => {
    const [wallet, setWallet] = useState<Wallet>()
    const [provider, setProvider] = useState<providers.Web3Provider>()
    const [address, setAddress] = useState<string>()

    const networkId = 1

    const onboard = useMemo(
        () =>
            Onboard({
                dappId: DAPP_ID,
                networkId,

                subscriptions: {
                    address: (address) => {
                        setAddress(address)
                    },

                    wallet: (wallet) => {
                        setWallet(wallet)
                    },
                },
                walletSelect: {
                    wallets: wallets,
                },
            }),
        []
    )

    useEffect(() => {
        if (address && wallet?.provider) {
            crvusd.init("Web3", { externalProvider: wallet.provider }, { chainId: networkId })
        }
    }, [address, wallet?.provider]);

    ...

Notes

1 Amounts can be passed in args either as numbers or strings.
2 llamma.swapPriceImpact method returns %, e. g. 0 < priceImpact <= 100.
3 Slippage arg should be passed as %, e. g. 0 < slippage <= 100.

General methods

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    await crvusd.init('JsonRpc', {});
    
    const balances1 = await crvusd.getBalances(['crvusd', 'weth']);
    // OR const balances1 = await crvusd.getBalances(['0x3194cBDC3dbcd3E11a07892e7bA5c3394048Cc87', '0xa3B53dDCd2E3fC28e8E130288F2aBD8d5EE37472']);
    console.log(balances1);
    // [ '10000.0', '0.0' ]

    // You can specify the address
    const balances2 = await crvusd.getBalances(['crvusd', 'weth'], "0x0063046686E46Dc6F15918b61AE2B121458534a5");
    // OR const balances2 = await crvusd.getBalances(['0x028171bCA77440897B824Ca71D1c56caC55b68A3', '0x6c5024cd4f8a59110119c56f8933403a539555eb'], '0x0063046686E46Dc6F15918b61AE2B121458534a5');
    console.log(balances2);
    // [ '0.0', '0.0' ]

    
    const spender = "0x3897810a334833184Ef7D6B419ba4d78EC2bBF80";

    await crvusd.getAllowance(["crvusd", "weth"], crvusd.signerAddress, spender);
    // [ '0.0', '0.0' ]
    await crvusd.hasAllowance(["crvusd", "weth"], ['1000', '1000'], crvusd.signerAddress, spender);
    // false
    await crvusd.ensureAllowance(["crvusd", "weth"], ['1000', '1000'], spender);
    // [
    //     '0xb0cada2a2983dc0ed85a26916d32b9caefe45fecde47640bd7d0e214ff22aed3',
    //     '0x00ea7d827b3ad50ce933e96c579810cd7e70d66a034a86ec4e1e10005634d041'
    // ]

    await crvusd.getUsdRate('0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee');
    // 1257.43
})()

Llammas

Llamma fields

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');

    llamma.id;
    // eth
    llamma.address;
    // 0x3897810a334833184Ef7D6B419ba4d78EC2bBF80
    llamma.controller;
    // 0x1eF9f7C2abD0E351a8966f00565e1b04765d3f0C
    llamma.collateralSymbol;
    // WETH
    llamma.collateralDecimals;
    // 18
    llamma.coins;
    // [ 'crvUSD', 'WETH' ]
    llamma.coinAddresses;
    // [
    //     '0x3194cBDC3dbcd3E11a07892e7bA5c3394048Cc87',
    //     '0xa3B53dDCd2E3fC28e8E130288F2aBD8d5EE37472'
    // ]
    llamma.coinDecimals;
    // [ 18, 18 ]
    llamma.minTicks;
    // 5
    llamma.maxTicks;
    // 50
    llamma.defaultTicks;
    // 20
})()

Wallet balances for llamma

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    await crvusd.init('JsonRpc', {});
    
    const llamma = crvusd.getLlamma('eth');
    
    // 1. Current address (signer) balances

    await llamma.wallet.balances();
    // { stablecoin: '0.0', collateral: '1.0' }

    
    // 2. You can specify the address
    
    await llamma.wallet.balances("0x0063046686E46Dc6F15918b61AE2B121458534a5");
    // { stablecoin: '0.0', collateral: '0.0' }
})()

Stats

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');

    await llamma.stats.parameters();
    // {
    //     A: '100',
    //     fee: '0.0',
    //     admin_fee: '0.0',
    //     rate: '0.0',
    //     base_price: '3000.0',
    //     min_band: '0',
    //     max_band: '15',
    //     active_band: '11',
    //     minted: '5428.767016666357716798',
    //     redeemed: '4053.027016666357716798',
    //     liquidation_discount: '2.0',
    //     loan_discount: '5.0'
    // }
    await llamma.stats.balances();
    // [ '300.0', '0.402268776965776345' ]
    await llamma.stats.bandBalances();
    // {
    //     '0': { stablecoin: '0.0', collateral: '0.0' },
    //     '1': { stablecoin: '0.0', collateral: '0.0' },
    //     '2': { stablecoin: '0.0', collateral: '0.0' },
    //     '3': { stablecoin: '0.0', collateral: '0.0' },
    //     '4': { stablecoin: '0.0', collateral: '0.0' },
    //     '5': { stablecoin: '0.0', collateral: '0.0' },
    //     '6': { stablecoin: '0.0', collateral: '0.0' },
    //     '7': { stablecoin: '0.0', collateral: '0.0' },
    //     '8': { stablecoin: '0.0', collateral: '0.0' },
    //     '9': { stablecoin: '0.0', collateral: '0.0' },
    //     '10': { stablecoin: '0.0', collateral: '0.0' },
    //     '11': { stablecoin: '300.0', collateral: '0.002268776965776345' },
    //     '12': { stablecoin: '0.0', collateral: '0.1' },
    //     '13': { stablecoin: '0.0', collateral: '0.1' },
    //     '14': { stablecoin: '0.0', collateral: '0.1' },
    //     '15': { stablecoin: '0.0', collateral: '0.1' }
    // }
    await llamma.stats.totalDebt();
    // 1375.74
})()

Create loan, add collateral, borrow more, repay

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');
    
    
    // --- CREATE LOAN ---

    await llamma.oraclePrice();
    // 3000.0
    await llamma.price();
    // 3045.569137149127502965
    await llamma.wallet.balances();
    // { stablecoin: '0.0', collateral: '1.0' }
    await llamma.createLoanMaxRecv(0.5, 5);
    // 1375.74670276529114147
    await llamma.createLoanTicks(0.5, 1000, 5);
    // [ 32, 36 ]
    await llamma.createLoanPrices(0.5, 1000, 5);
    // [ '2174.941007873561634', '2068.347257607234777' ]
    await llamma.createLoanHealth(0.5, 1000, 5);  // FULL
    // 45.191203147616155
    await llamma.createLoanHealth(0.5, 1000, 5, false);  // NOT FULL
    // 3.9382535412942367
    
    await llamma.createLoanIsApproved(0.5);
    // false
    await llamma.createLoanApprove(0.5);
    // [
    //     '0xc111e471715ae6f5437e12d3b94868a5b6542cd7304efca18b5782d315760ae5'
    // ]
    await llamma.createLoan(0.5, 1000, 5);

    await llamma.debt();  // OR await llamma.debt(address);
    // 1000.0
    await llamma.loanExists();
    // true
    await llamma.health();  // FULL
    // 45.1912031476161562 %
    await llamma.health(false);  // NOT FULL
    // 3.9382535412942379
    await llamma.userTicks();
    // [ 32, 36 ]
    await llamma.userPrices();
    // [ '2174.941007873561634', '2068.347257607234777' ]
    await llamma.userState();
    // { collateral: '0.5', stablecoin: '0.0', debt: '1000.0' }

    // --- BORROW MORE ---

    await llamma.borrowMoreMaxRecv(0.1);
    // 650.896043318349376298
    await llamma.borrowMoreTicks(0.1, 500);
    // [ 10, 14 ]
    await llamma.borrowMorePrices(0.1, 500);
    // [ '2713.146225026413746', '2580.175063923865968' ]
    await llamma.borrowMoreHealth(0.1, 500);  // FULL
    // 15.200984677843693 %
    await llamma.borrowMoreHealth(0.1, 500, false);  // NOT FULL
    // 3.7268336789002429 %
    
    await llamma.borrowMoreIsApproved(0.1);
    // true
    await llamma.borrowMoreApprove(0.1);
    // []
    
    await llamma.borrowMore(0.1, 500);

    // Full health: 15.200984677843694 %
    // Not full health: 3.7268336789002439 %
    // Ticks: [ 10, 14 ]
    // Prices: [ '2713.146225026413746', '2580.175063923865968' ]
    // State: { collateral: '0.6', stablecoin: '0.0', debt: '1500.0' }

    // --- ADD COLLATERAL ---

    await llamma.addCollateralTicks(0.2);
    // [ 39, 43 ]
    await llamma.addCollateralPrices(0.2);
    // [ '2027.187147180850842', '1927.834806254156043' ]
    await llamma.addCollateralHealth(0.2);  // FULL
    // 55.2190795613534006
    await llamma.addCollateralHealth(0.2, false);  // NOT FULL
    // 3.3357274109987789
    
    await llamma.addCollateralIsApproved(0.2);
    // true
    await llamma.addCollateralApprove(0.2);
    // []
    
    await llamma.addCollateral(0.2);  // OR await llamma.addCollateral(0.2, forAddress);

    // Full health: 55.2190795613534014 %
    // Not full health: 3.3357274109987797 %
    // Ticks: [ 39, 43 ]
    // Prices: [ '2027.187147180850842', '1927.834806254156043' ]
    // State: { collateral: '0.8', stablecoin: '0.0', debt: '1500.0' }

    // --- REMOVE COLLATERAL ---

    await llamma.maxRemovable()
    // 0.254841506439755199
    await llamma.removeCollateralTicks(0.1);
    // [ 25, 29 ]
    await llamma.removeCollateralPrices(0.1);
    // [ '2333.46407819744091', '2219.101120164841944' ]
    await llamma.removeCollateralHealth(0.1);  // FULL
    // 35.1846612411492316
    await llamma.removeCollateralHealth(0.1, false);  // NOT FULL
    // 4.0796515570298074
    
    await llamma.removeCollateral(0.1);

    // Full health: 35.1846612411492326 %
    // Not full health: 4.0796515570298084 %
    // Ticks: [ 25, 29 ]
    // Prices: [ '2333.46407819744091', '2219.101120164841944' ]
    // State: { collateral: '0.7', stablecoin: '0.0', debt: '1500.0' }

    // --- REPAY ---

    await llamma.wallet.balances();
    // { stablecoin: '1500.0', collateral: '0.3' }

    await llamma.repayTicks(1000);
    // [ 135, 139 ]
    await llamma.repayPrices(1000);
    // [ '772.453820291837448', '734.595897104762463' ]
    await llamma.repayHealth(1000);  // FULL
    // 315.2178906180373138
    await llamma.repayHealth(1000, false);  // NOT FULL
    // 3.3614254588945566
    
    await llamma.repayIsApproved(1000);
    // true
    await llamma.repayApprove(1000);
    // []
    await llamma.repay(1000);

    // Full health: 315.2178906180373149 %
    // Not full health: 3.3614254588945577 %
    // Ticks: [ 135, 139 ]
    // Prices: [ '772.453820291837448', '734.595897104762463' ]
    // State: { collateral: '0.7', stablecoin: '0.0', debt: '500.0' }
})()

Create loan all ranges methods

    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');

    await llamma.createLoanMaxRecvAllRanges(1);
    // {
    //     '5': '2751.493405530582454486',
    //     '6': '2737.828112577888632315',
    //     '7': '2724.253615257658154585',
    //     '8': '2710.76923397831492797',
    //     '9': '2697.374294577689210021',
    //     '10': '2684.068128277815937982',
    //     '11': '2670.850071640120547429',
    //     '12': '2657.719466520988458715',
    //     '13': '2644.675660027714709155',
    //     '14': '2631.718004474831209682',
    //     '15': '2618.845857340807263461',
    //     '16': '2606.058581225120973696',
    //     '17': '2593.355543805697908653',
    //     '18': '2580.736117796713531552',
    //     '19': '2568.199680906757040338',
    //     '20': '2555.745615797352299399',
    //      
    //      ...
    //
    //     '50': '2217.556229455652339229'
    // }

    await llamma.createLoanTicksAllRanges(1, 2600);
    // {
    //     '5': [ 6, 10 ],
    //     '6': [ 6, 11 ],
    //     '7': [ 5, 11 ],
    //     '8': [ 5, 12 ],
    //     '9': [ 4, 12 ],
    //     '10': [ 4, 13 ],
    //     '11': [ 3, 13 ],
    //     '12': [ 3, 14 ],
    //     '13': [ 2, 14 ],
    //     '14': [ 2, 15 ],
    //     '15': [ 1, 15 ],
    //     '16': [ 1, 16 ],
    //     '17': null,
    //     '18': null,
    //     '19': null,
    //     '20': null,
    //
    //      ...
    //
    //     '50': null
    // }

    await llamma.createLoanPricesAllRanges(1, 2600);
    // {
    //     '5': [ '2824.440448203', '2686.01476277614933533' ],
    //     '6': [ '2824.440448203', '2659.154615148387841976' ],
    //     '7': [ '2852.9701497', '2659.154615148387841976' ],
    //     '8': [ '2852.9701497', '2632.563068996903963557' ],
    //     '9': [ '2881.78803', '2632.563068996903963557' ],
    //     '10': [ '2881.78803', '2606.237438306934923921' ],
    //     '11': [ '2910.897', '2606.237438306934923921' ],
    //     '12': [ '2910.897', '2580.175063923865574682' ],
    //     '13': [ '2940.3', '2580.175063923865574682' ],
    //     '14': [ '2940.3', '2554.373313284626918935' ],
    //     '15': [ '2970', '2554.373313284626918935' ],
    //     '16': [ '2970', '2528.829580151780649746' ],
    //     '17': null,
    //     '18': null,
    //     '19': null,
    //     '20': null,
    //
    //      ...
    //
    //     '50': null
    // }

Swap

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');

    await llamma.wallet.balances();
    // {
    //     stablecoin: '301.533523886491869218',
    //     collateral: '0.860611976623971606'
    // }


    await llamma.maxSwappable(0, 1);
    // 380.672763174593107707
    await llamma.swapExpected(0, 1, 100);  // 100 - in_amount
    // 0.03679356627103543 (out_amount)
    await llamma.swapRequired(0, 1, 0.03679356627103543);  // 0.03679356627103543 - out_amount
    // 100.000000000000000558 (in_amount)
    await llamma.swapPriceImpact(0, 1, 100);
    // 0.170826
    await llamma.swapIsApproved(0, 100);
    // true
    await llamma.swapApprove(0, 100);
    // []
    await llamma.swap(0, 1, 100, 0.1);

    await llamma.wallet.balances();
    // {
    //     stablecoin: '201.533523886491869218',
    //     collateral: '0.897405542895007036'
    // }
})()

Self-liquidation

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');

    // Wallet balances: {
    //     stablecoin: '301.533523886491869218',
    //     collateral: '0.860611976623971606'
    // }
    // State: {
    //     collateral: '0.139388023376028394',
    //     stablecoin: '2751.493405530582315609',
    //     debt: '3053.026929417074184827'
    // }
    
    await llamma.tokensToLiquidate();
    // 301.533523886491869218
    await llamma.selfLiquidateIsApproved();
    // true
    await llamma.selfLiquidateApprove();
    // []
    await llamma.selfLiquidate(0.1); // slippage = 0.1 %

    // Wallet balances: { stablecoin: '0.0', collateral: '1.0' }
    // State: { collateral: '0.0', stablecoin: '0.0', debt: '0.0' }
})()

Liquidation

(async () => {
    await crvusd.init('JsonRpc', {});

    const llamma = crvusd.getLlamma('eth');
    const addressToLiquidate = "0x66aB6D9362d4F35596279692F0251Db635165871";

    await llamma.wallet.balances();
    // Liquidator wallet balances: {
    //     stablecoin: '301.533523886491869218',
    //     collateral: '0.860611976623971606'
    // }
    await llamma.userState(addressToLiquidate);
    // State of the account we are goning to liquidate: {
    //     collateral: '0.139388023376028394',
    //     stablecoin: '2751.493405530582315609',
    //     debt: '3053.026929417074184827'
    // }
    
    await llamma.tokensToLiquidate(addressToLiquidate);
    // 301.533523886491869218
    await llamma.liquidateIsApproved();
    // true
    await llamma.liquidateApprove();
    // []
    await llamma.liquidate(addressToLiquidate, 0.1); // slippage = 0.1 %

    // Liquidator wallet balances: { stablecoin: '0.0', collateral: '1.0' }
    // State of liquidated account: { collateral: '0.0', stablecoin: '0.0', debt: '0.0' }
})()

Gas estimation

Every non-constant method has corresponding gas estimation method. Rule: obj.method -> obj.estimateGas.method

Examples

import crvusd from "@curvefi/stablecoin-api";

(async () => {
    await crvusd.init('JsonRpc', {});
    
    const spender = "0x3897810a334833184Ef7D6B419ba4d78EC2bBF80";
    await crvusd.estimateGas.ensureAllowance(["weth"], [1], spender);
    // 94523
    
    const llamma = crvusd.getLlamma('eth');
    await llamma.estimateGas.createLoanApprove(0.5);
    // 186042
    await llamma.estimateGas.createLoan(0.5, 1000, 20);
    // 1306411
})()

Name		Name	Last commit message	Last commit date
Latest commit History 44 Commits
.github/workflows		.github/workflows
src		src
test		test
.eslintrc.json		.eslintrc.json
.gitignore		.gitignore
.npmignore		.npmignore
LICENSE		LICENSE
README.md		README.md
package.json		package.json
tsconfig.build.json		tsconfig.build.json
tsconfig.json		tsconfig.json

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CRVUSD JS

Setup

Init

Notes

General methods

Llammas

Llamma fields

Wallet balances for llamma

Stats

Create loan, add collateral, borrow more, repay

Create loan all ranges methods

Swap

Self-liquidation

Liquidation

Gas estimation

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tethercoin/curve-stablecoin-js

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CRVUSD JS

Setup

Init

Notes

General methods

Llammas

Llamma fields

Wallet balances for llamma

Stats

Create loan, add collateral, borrow more, repay

Create loan all ranges methods

Swap

Self-liquidation

Liquidation

Gas estimation

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