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Ref SDK

This SDK provides functions of AMM features both for Dapp developers or makers.

Install

For yarn Developers: yarn add @ref_finance/ref-sdk

For npm Developers: npm install @ref_finance/ref-sdk

Initialization

Ref SDK identifies env variable NEAR_ENV to get global configuration. Suggest to use export NEAR_ENV=mainnet or export NEAR_ENV=testnet to set up NEAR network.

export function getConfig(env: string | undefined = process.env.NEAR_ENV) {
  switch (env) {
    case 'mainnet':
      return {
        networkId: 'mainnet',
        nodeUrl: 'https://rpc.mainnet.near.org',
        walletUrl: 'https://wallet.near.org',
        WRAP_NEAR_CONTRACT_ID: 'wrap.near',
        REF_FI_CONTRACT_ID: 'v2.ref-finance.near',
      };
    case 'testnet':
      return {
        networkId: 'testnet',
        nodeUrl: 'https://rpc.testnet.near.org',
        walletUrl: 'https://wallet.testnet.near.org',
        WRAP_NEAR_CONTRACT_ID: 'wrap.testnet',
        REF_FI_CONTRACT_ID: 'ref-finance-101.testnet',
      };
    default:
      return {
        networkId: 'mainnet',
        nodeUrl: 'https://rpc.mainnet.near.org',
        walletUrl: 'https://wallet.near.org',
        REF_FI_CONTRACT_ID: 'v2.ref-finance.near',
        WRAP_NEAR_CONTRACT_ID: 'wrap.near',
      };
  }
}

Functions

Tokens

ftGetTokenMetadata

Get token metadata.

Parameters

id: string;

Example

const WrapNear = await ftGetTokenMetadata('wrap.testnet');

Response

{
  decimals: 24;
  icon: null;
  id: 'wrap.testnet';
  name: 'Wrapped NEAR fungible token';
  reference: null;
  reference_hash: null;
  spec: 'ft-1.0.0';
  symbol: 'wNEAR';
}

ftGetTokensMetadata

Get tokens metadata and set token id as index.

Parameters

tokenIds: string[]

Example

const tokensMetadata = await ftGetTokensMetadata([
  'ref.fakes.testnet',
  'wrap.testnet',
]);

Response

{
  "ref.fakes.testnet":{
    decimals: 18
    icon: "data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='16 24 248 248' style='background: %23000'%3E%3Cpath d='M164,164v52h52Zm-45-45,20.4,20.4,20.6-20.6V81H119Zm0,18.39V216h41V137.19l-20.6,20.6ZM166.5,81H164v33.81l26.16-26.17A40.29,40.29,0,0,0,166.5,81ZM72,153.19V216h43V133.4l-11.6-11.61Zm0-18.38,31.4-31.4L115,115V81H72ZM207,121.5h0a40.29,40.29,0,0,0-7.64-23.66L164,133.19V162h2.5A40.5,40.5,0,0,0,207,121.5Z' fill='%23fff'/%3E%3Cpath d='M189 72l27 27V72h-27z' fill='%2300c08b'/%3E%3C/svg%3E%0A"
    id: "ref.fakes.testnet"
    name: "Ref Finance Token"
    reference: null
    reference_hash: null
    spec: "ft-1.0.0"
    symbol: "REF"
  },
  "wrap.testnet":{
    decimals: 24
    icon: null
    id: "wrap.testnet"
    name: "Wrapped NEAR fungible token"
    reference: null
    reference_hash: null
    spec: "ft-1.0.0"
    symbol: "wNEAR"
  }
}

Pools

fetchAllPools

Fetch all pools in Ref, including simple pools, rated pools and unrated pools.

Parameters

None

Example

const { ratedPools, unRatedPools, simplePools } = await fetchAllPools();

Response

{
  ratedPools:[{
    fee: 5,
    id: 568,
    pool_kind: "RATED_SWAP",
    shareSupply: "80676034815429711745720012070",
    supplies:{
      "meta-v2.pool.testnet": "1298314415249170366960739764"
    	"wrap.testnet": "80182803630538035347294614770"
  	},
    token0_ref_price: undefined,
    tokenIds: ["meta-v2.pool.testnet", "wrap.testnet"],
    tvl: undefined
  },...]
  unRatedPools:[...],
  simplePools:[...],
}

getStablePools

We define unRatedPools and ratedPools as stablePool. You can use this function to get details of stable pools.

Parameters

stablePools: Pool[]

Example

const stablePools: Pool[] = unRatedPools.concat(ratedPools);

const stablePoolsDetail: StablePool[] = await getStablePools(stablePools);

Response

[
  {
    amounts: ['1298314415249170366960739764', '80182803630538035347294614770'],
    amp: 240,
    c_amounts:["1298314415249170366960739764","80182803630538035347294614770"],
    decimals:[24,24],
    id: 568,
    pool_kind: "RATED_SWAP",
    rates:["1972101024157559347385372","1000000000000000000000000"],
    shares_total_supply: "80676034815429711745720012070",
    token_account_ids:["meta-v2.pool.testnet","wrap.testnet"],
    total_fee:5
  },
	...
]

Swap

estimateSwap

Get swap routes by pools, tokens and input amount. Please notice since there is message constraint on Ledger, we set enableSmartRouting option for developers.

This function integrates smart routing, parallel swap and hybrid stable smart routing algorihtms to get best estimate based on input pools.

Parameters

interface SwapParams {
  tokenIn: TokenMetadata;
  tokenOut: TokenMetadata;
  amountIn: string;
  simplePools: Pool[];
  options?: SwapOptions;
}

interface SwapOptions {
  enableSmartRouting?: boolean;
  stablePools?: Pool[];
  stablePoolsDetail?: StablePool[];
}

Example (enableSmartRouting == false)

// enableSmartRouting as false, swap from Ref to wNear, with amount 1
const tokenIn = await ftGetTokenMetadata('ref.fakes.testnet');
const tokenOut = await ftGetTokenMetadata('wrap.testnet');

const swapTodos: EstimateSwapView[] = estimateSwap({
  tokenIn,
  tokenOut,
  amountIn: '1',
  simplePools,
});

Response (enableSmartRouting == false)

// enableSmartRouting to false, swap from Ref to wNear, with amount 1

[
  {
    estimate: '0.7338604246699393',
    inputToken: 'ref.fakes.testnet',
    outputToken: 'wrap.testnet',
    pool: {
      fee: 30,
      id: 38,
      partialAmountIn: '1000000000000000000',
      pool_kind: 'SIMPLE_POOL',
      shareSupply: '1000587315520795219676332',
      supplies: {
        'ref.fakes.testnet': '7789776060978885018',
        'wrap.testnet': '6467670222256390319335181',
      },
      token0_ref_price: undefined,
      tokenIds: (2)[('ref.fakes.testnet', 'wrap.testnet')],
      tvl: undefined,
    },
  },
];

Example (enableSmartRouting == true)

// enableSmartRouting as true, swap from Ref to wNear, with amount 1
const tokenIn = await ftGetTokenMetadata('ref.fakes.testnet');
const tokenOut = await ftGetTokenMetadata('wrap.testnet');

const options: SwapOptions = {
  enableSmartRouting: true,
  stablePools,
  stablePoolsDetail,
};

const swapTodos: EstimateSwapView[] = estimateSwap({
  tokenIn,
  tokenOut,
  amountIn: '1',
  simplePools,
  options,
});

Response (enableSmartRouting == true)

// enableSmartRouting as true, swap from Ref to wNear, with amount 1
[
  {
    estimate: "0.000225321544275095902371355566972009167",
    inputToken: "ref.fakes.testnet",
    outputToken: "nusdt.ft-fin.testnet",
    pool:{
      id: 341,
      partialAmountIn: "836859596261755688",
      tokenIds: ["ref.fakes.testnet","nusdt.ft-fin.testnet"],
      ...
    },
    ...
  },{
    estimate: "0.5203255327171591155634413370660973429264",
    inputToken: "nusdt.ft-fin.testnet",
    outputToken: "wrap.testnet",
    pool:{
      id: 1625,
      tokenIds: ["nusdt.ft-fin.testnet","wrap.testnet"],
      ...
    },
    ...
  },{
    estimate: "5.3206339674140066489000963525772735539612",
    inputToken: "ref.fakes.testnet",
    outputToken: "usdn.testnet",
    pool:{
      id: 376,
      tokenIds: ["usdn.testnet","ref.fakes.testnet"],
      partialAmountIn: "163140403738244312",
      ...
    },
    ...
  },{
    estimate: "0.2036473132202839680683206178037243543302",
    inputToken: "usdn.testnet",
    outputToken: "wrap.testnet",
    pool:{
      id: 385,
      tokenIds: ["usdn.testnet","wrap.testnet"],
      ...
    },
    ...
  }
]

getPoolEstimate

Get estimate output from single pool, which integrates estimate method of simple pool and stable pool.

Parameters

{
  tokenIn: TokenMetadata;
  tokenOut: TokenMetadata;
  amountIn: string;
  pool: Pool;
  // please input stablePoolDetail if you want estimate output on stable pool or the pool will be recognized as simple pool
  stablePoolDetail?: StablePool;
}

Example (on simple pool)

// estimate on simple Pool
const estimate = await getPoolEstimate({
  tokenIn,
  tokenOut,
  amountIn: '1',
  pool,
});

Response (on simple pool)

// estimate on simple pool, swap from Ref to wNear, with amount 1
{
  estimate: "0.7338604246699393",
  inputToken: "ref.fakes.testnet",
  outputToken: "wrap.testnet",
  pool:{
    fee: 30,
    id: 38,
    partialAmountIn: "1000000000000000000",
    pool_kind: "SIMPLE_POOL",
    shareSupply: "1000587315520795219676332",
    supplies: {"ref.fakes.testnet": '7789776060978885018', "wrap.testnet": 								'6467670222256390319335181'},
    token0_ref_price: undefined,
    tokenIds: (2) ['ref.fakes.testnet', 'wrap.testnet'],
    tvl: undefined
  }
}

Example (on stable pool)

// estimate on stable pool
const estimate = await getPoolEstimate({
  tokenIn,
  tokenOut,
  amountIn: '1',
  pool: stablePool,
  stablePoolDetail: stablePoolDetail,
});

Response (on stable pool)

// estimate on stable pool, swap from stNear to wNear, with amount 1
{
  estimate: "2.4898866773442284",
  inputToken: "meta-v2.pool.testnet",
  noFeeAmountOut: "2.491132243465961",
  outputToken: "wrap.testnet",
  pool:{
    amounts:["1298314415249170366960739764","80182803630538035347294614770"],
    amp: 240,
    c_amounts:["1298314415249170366960739764","80182803630538035347294614770"],
    decimals:[24,24],
    id: 568,
    pool_kind: "RATED_SWAP",
    rates:["1972204647926836788049038","1000000000000000000000000"],
    shares_total_supply: "80676034815429711745720012070",
    token_account_ids:["meta-v2.pool.testnet", "wrap.testnet"],
    total_fee: 5,
  }
}

Transactions

instantSwap

Set up transactions through swap routes. Please notice that you have to make sure the AccountId have a balance storaged in the token-in contract, otherwise the transaction would fail and user would lose the input token amount.

Dapp developers only need to create transactions then send to wallets.

Parameters

{
  tokenIn: TokenMetadata;
  tokenOut: TokenMetadata;
  amountIn: string;
  slippageTolerance: number;
  swapTodos: EstimateSwapView[];
  AccountId: string;
}

Example

const transactionsRef: Transaction[] = await instantSwap({
  tokenIn,
  tokenOut,
  amountIn: '1',
  swapTodos,
  slippageTolerance = 0.01,
});

Response

[
  {
    functionCalls: [
      {
        amount: '0.000000000000000000000001',
        args: {
          amount: '1000000000000000000',
          msg:
            '{"force":0,"actions":[{"pool_id":38,"token_in":"ref.fakes.testnet","token_out":"wrap.testnet","amount_in":"1000000000000000000","min_amount_out":"730191122546589600000000"}]}',
          receiver_id: 'ref-finance-101.testnet',
        },
        gas: '180000000000000',
        methodName: 'ft_transfer_call',
      },
    ],
    receiverId: 'ref.fakes.testnet',
  },
];

getSignedTransactionsByMemoryKey (Node)

In the local env, developers could add credentials by near login .

This function utilizes credentials stored in the local env to sign transactions.

Parameters

{
  transactionsRef: Transaction[];
  AccountId: string;
  keyPath: string;
}

Example

const signedTransactions:nearTransactions.SignedTransaction[] = getSignedTransactionsByMemoryKey({
  transactionsRef;
  AccountId: "your-account-id.testnet",
  keyPath: "/.near-credentials/testnet/your-account-id.testnet.json"
})

Response

[
  SignedTransaction {
    transaction: Transaction {
      signerId: 'your-account-id.testnet',
      publicKey: [PublicKey],
      nonce: 91940092000042,
      receiverId: 'ref.fakes.testnet',
      actions: [Array],
      blockHash: <Buffer 45 e5 fd 36 87 3b 10 59 81 d9 a7 b5 20 c7 29 33 f7 27 48 59 06 90 ca 8a 17 03 5c 25 f2 76 ab 7c>
    },
    signature: Signature { keyType: 0, data: [Uint8Array] }
  }
]

sendTransactionsByMemoryKey (Node)

This function utilizes credentials stored in the local env to send transactions.

Parameters

{
  signedTransactions: nearTransactions.SignedTransaction[];
}

Example

sendTransactionsByMemoryKey({
  signedTransactions,
});

Response

[
  {
    receipts_outcome: [
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object],
      [Object], [Object]
    ],
    status: { SuccessValue: 'xxxxxx' },
    transaction: {
      actions: [Array],
      hash: 'xxxxxxxx',
      nonce: 91940092000042,
      public_key: 'ed25519:xxxxxxxx',
      receiver_id: 'ref.fakes.testnet',
      signature: 'ed25519:xxxxxxxxxxxxx',
      signer_id: 'your-account-id.testnet'
    },
    transaction_outcome: {
      block_hash: '3QXEF941UvsHzXrMhwbchk7wmy3qmPNs3w9gkfvW84QK',
      id: 'xxxxxxxx',
      outcome: [Object],
      proof: []
    }
  }
]