Anchor.js

Anchor.js is a client SDK for building applications that can interact with Anchor Protocol from within JavaScript runtimes, such as web browsers, server backends, and on mobile through React Native.

You can find a reference of the Anchor.js API here.

Getting Anchor.js

Anchor.js is available as a package on NPM and is intended to be used alongside Terra.js.

Add both:

• @gnchain/chain.js
• @anchor-protocol/anchor.js

To your JavaScript project's package.json as dependencies using your preferred package manager:

1$ npm install -S @gnchain/chain.js @anchor-protocol/anchor.js

Usage

Using Facades

Anchor.js provides class wrapper facade for the usual operations available on webapp.

1import { LCDClient, MnemonicKey, Fee, Wallet } from '@gnchain/chain.js'
2import { Anchor, columbus5, AddressProviderFromJson, MARKET_DENOMS, OperationGasParameters } from '@anchor-protocol/anchor.js'
3
4const addressProvider = new AddressProviderFromJson(columbus5)
5const lcd = new LCDClient({ URL: 'https://lcd.terra.dev', chainID: 'columbus-5' })
6const key = new MnemonicKey({
7  mnemonic: 'your key'
8})
9const wallet = new Wallet(lcd, key)
10const anchor = new Anchor(lcd, addressProvider)
11
12// you can generate message only, using your wallet
13const msgs = anchor.earn.depositStable(MARKET_DENOMS.UUSD, "100.5000").generateWithWallet(wallet)
14
15// you can ALSO generate message only, using your address in string
16const msgs = anchor.earn.depositStable(MARKET_DENOMS.UUSD, "100.5000").generateWithAddress("terra1...")
17
18// or, you can broadcast the tx using your wallet
19// below is the recommended default setting for gas parameters.
20// of course you can tailor it to your needs
21const gasParameters: OperationGasParameters = {
22  gasAdjustment: 1.4,
23  gasPrices: "0.15uusd",
24
25  // or if you want to fixate gas, you can use `fee`
26  fee: new Fee(gasToSpend, "100000uusd")
27}
28const txResult = await anchor.earn.depositStable(MARKET_DENOMS.UUSD, "100.5000").execute(wallet, gasParameters)

When working with bAsset's, they can be loaded in one of two ways.

1import { LCDClient, MnemonicKey, Fee, Wallet } from '@gnchain/chain.js'
2import { Anchor, columbus5, bAssetColumbus5, AddressProviderFromJson, MARKET_DENOMS } from '@anchor-protocol/anchor.js'
3
4const addressProvider = new AddressProviderFromJson(columbus5)
5const lcd = new LCDClient({ URL: 'https://lcd.terra.dev', chainID: 'columbus-5' })
6const key = new MnemonicKey({
7  mnemonic: 'your key'
8})
9const wallet = new Wallet(lcd, key)
10const anchor = new Anchor(lcd, addressProvider)
11
12// load the bAsset from the available whitelisted collateral
13const collaterals = await anchor.moneyMarket.getCollateralWhitelist({
14  market: MARKET_DENOMS.UUSD,
15});
16
17const [collateral] = collaterals.filter(
18  (collateral) => collateral.symbol === 'BETH',
19);
20
21const bAsset = await anchor.bAsset(collateral);
22
23// alternatively, the bAsset can be loaded with the symbol and market demons
24const bAsset = await anchor.bAsset({ symbol: 'BETH', market: MARKET_DENOMS.UUSD });
25
26// once you have the bAsset, you can then perform operations
27const operation = bAsset.claim({ recipient: 'terra1...' });

Using Message Fabricators

Anchor.js provides facilities for 2 main use cases:

• query: runs smart contract queries through LCD
• execute: creates proper MsgExecuteContract objects to be used in transactions

Both of these functions are accessible through the Message Fabricators.

To Use the message fabricators:

Note: Please note that market is a different variable from the coin denom. The denomination for the coins in the example is set to be uusd.

1import {fabricateRedeemStable, fabricateDepositStableCoin} from '@anchor-protocol/anchor.js';
2import {AddressProviderFromJson} from "@anchor-protocol/anchor.js"; 
3
4// default -- uses bombay core contract addresses
5const addressMap = somehowGetAddresses();
6const addressProvider = new AddressProviderFromJson(addressMap);
7    const redeemMsg = fabricateRedeemStable({
8      address: 'terra123...',
9      market: 'usd',
10      amount: '10000',
11    })(addressProvider);
12
13    const depositMsg = fabricateDepositStableCoin({
14      address: 'terra123...',
15      market: 'usd',
16      amount: '10',
17    })(addressProvider);

Executing

A message fabricator contains functions for generating proper MsgExecuteContract messages to be included in a transaction and broadcasted.

1import { LCDClient, Wallet, MnemonicKey, Fee} from '@gnchain/chain.js';
2
3const anchor = new LCDClient({ URL: 'https://bombay-lcd.terra.dev', chainID:'bombay-12' });
4const owner = new MnemonicKey({ mnemonic: "...."});
5const wallet = new Wallet(anchor, owner);
6
7async function depositStable() {
8    const tx = await wallet.createAndSignTx({
9        msgs: depositMsg,
10        fee: new Fee(2_000_000, { uluna: 2_000_000 })
11    });
12    return await anchor.tx.broadcast(tx);
13}
14
15async function main() {
16  await depositStable()
17    .then((result) => {
18      console.log(result);
19    })
20    .catch(console.error);
21}
22
23main();

List of contract addresses deployed to networks

• columbus-5:

  1{
  2  bLunaHub: 'terra1mtwph2juhj0rvjz7dy92gvl6xvukaxu8rfv8ts',
  3  bLunaToken: 'terra1kc87mu460fwkqte29rquh4hc20m54fxwtsx7gp',
  4  bLunaReward: 'terra17yap3mhph35pcwvhza38c2lkj7gzywzy05h7l0',
  5  bLunaAirdrop: 'terra199t7hg7w5vymehhg834r6799pju2q3a0ya7ae9',
  6  bEthReward: 'terra1939tzfn4hn960ychpcsjshu8jds3zdwlp8jed9',
  7  bEthToken: 'terra1dzhzukyezv0etz22ud940z7adyv7xgcjkahuun',
  8  mmInterestModel: 'terra1kq8zzq5hufas9t0kjsjc62t2kucfnx8txf547n',
  9  mmOracle: 'terra1cgg6yef7qcdm070qftghfulaxmllgmvk77nc7t',
  10  mmMarket: 'terra1sepfj7s0aeg5967uxnfk4thzlerrsktkpelm5s',
  11  mmOverseer: 'terra1tmnqgvg567ypvsvk6rwsga3srp7e3lg6u0elp8',
  12  mmCustody: 'terra1ptjp2vfjrwh0j0faj9r6katm640kgjxnwwq9kn',
  13  mmCustodyBEth: 'terra10cxuzggyvvv44magvrh3thpdnk9cmlgk93gmx2',
  14  mmLiquidation: 'terra1w9ky73v4g7v98zzdqpqgf3kjmusnx4d4mvnac6',
  15  mmDistributionModel: 'terra14mufqpr5mevdfn92p4jchpkxp7xr46uyknqjwq',
  16  aTerra: 'terra1hzh9vpxhsk8253se0vv5jj6etdvxu3nv8z07zu',
  17  terraswapblunaLunaPair: 'terra1jxazgm67et0ce260kvrpfv50acuushpjsz2y0p',
  18  terraswapblunaLunaLPToken: 'terra1nuy34nwnsh53ygpc4xprlj263cztw7vc99leh2',
  19  terraswapAncUstPair: 'terra1gm5p3ner9x9xpwugn9sp6gvhd0lwrtkyrecdn3',
  20  terraswapAncUstLPToken: 'terra1gecs98vcuktyfkrve9czrpgtg0m3aq586x6gzm',
  21  gov: 'terra1f32xyep306hhcxxxf7mlyh0ucggc00rm2s9da5',
  22  distributor: 'terra1mxf7d5updqxfgvchd7lv6575ehhm8qfdttuqzz',
  23  collector: 'terra14ku9pgw5ld90dexlyju02u4rn6frheexr5f96h',
  24  community: 'terra12wk8dey0kffwp27l5ucfumczlsc9aned8rqueg',
  25  staking: 'terra1897an2xux840p9lrh6py3ryankc6mspw49xse3',
  26  ANC: 'terra14z56l0fp2lsf86zy3hty2z47ezkhnthtr9yq76',
  27  airdrop: 'terra146ahqn6d3qgdvmj8cj96hh03dzmeedhsf0kxqm',
  28  team_vesting: 'terra1pm54pmw3ej0vfwn3gtn6cdmaqxt0x37e9jt0za',
  29  investor_vesting: 'terra10evq9zxk2m86n3n3xnpw28jpqwp628c6dzuq42'
  30}

• bombay-12:

  1{
  2 bLunaHub: 'terra1fflas6wv4snv8lsda9knvq2w0cyt493r8puh2e',
  3 bLunaToken: 'terra1u0t35drzyy0mujj8rkdyzhe264uls4ug3wdp3x',
  4 bLunaReward: 'terra1ac24j6pdxh53czqyrkr6ygphdeftg7u3958tl2',
  5 bLunaAirdrop: 'terra1334h20c9ewxguw9p9vdxzmr8994qj4qu77ux6q',
  6 bEthReward: 'terra1ja3snkedk4t0zp7z3ljd064hcln8dsv5x004na',
  7 bEthToken: 'terra19mkj9nec6e3y5754tlnuz4vem7lzh4n0lc2s3l',
  8 mmInterestModel: 'terra1m25aqupscdw2kw4tnq5ql6hexgr34mr76azh5x',
  9 mmOracle: 'terra1p4gg3p2ue6qy2qfuxtrmgv2ec3f4jmgqtazum8',
  10 mmMarket: 'terra15dwd5mj8v59wpj0wvt233mf5efdff808c5tkal',
  11 mmOverseer: 'terra1qljxd0y3j3gk97025qvl3lgq8ygup4gsksvaxv',
  12 mmCustody: 'terra1ltnkx0mv7lf2rca9f8w740ashu93ujughy4s7p',
  13 mmCustodyBEth: 'terra1j6fey5tl70k9fvrv7mea7ahfr8u2yv7l23w5e6',
  14 mmLiquidation: 'terra16vc4v9hhntswzkuunqhncs9yy30mqql3gxlqfe',
  15 mmDistributionModel: 'terra1u64cezah94sq3ye8y0ung28x3pxc37tv8fth7h',
  16 aTerra: 'terra1ajt556dpzvjwl0kl5tzku3fc3p3knkg9mkv8jl',
  17 terraswapblunaLunaPair: 'terra13e4jmcjnwrauvl2fnjdwex0exuzd8zrh5xk29v',
  18 terraswapblunaLunaLPToken: 'terra1tj4pavqjqjfm0wh73sh7yy9m4uq3m2cpmgva6n',
  19 terraswapAncUstPair: 'terra1wfvczps2865j0awnurk9m04u7wdmd6qv3fdnvz',
  20 terraswapAncUstLPToken: 'terra1vg0qyq92ky9z9dp0j9fv5rmr2s80sg605dah6f',
  21 gov: 'terra16ckeuu7c6ggu52a8se005mg5c0kd2kmuun63cu',
  22 distributor: 'terra1z7nxemcnm8kp7fs33cs7ge4wfuld307v80gypj',
  23 collector: 'terra1hlctcrrhcl2azxzcsns467le876cfuzam6jty4',
  24 community: 'terra17g577z0pqt6tejhceh06y3lyeudfs3v90mzduy',
  25 staking: 'terra19nxz35c8f7t3ghdxrxherym20tux8eccar0c3k',
  26 ANC: 'terra1747mad58h0w4y589y3sk84r5efqdev9q4r02pc',
  27 airdrop: 'terra1u5ywhlve3wugzqslqvm8ks2j0nsvrqjx0mgxpk',
  28 investor_vesting: 'not available in testnet',
  29 team_vesting: 'not available in testnet',
  30}

License

This software is licensed under the Apache 2.0 license. Read more about it here.

© 2021 Anchor Protocol