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https://github.com/paraswap/paraswap-sdk

ParaSwap allows dApps and traders to get the best DEX liquidity by aggregating multiple markets and offering the best rates
https://github.com/paraswap/paraswap-sdk

blockchain cryptocurrency ethereum exchange paraswap solidity web3

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ParaSwap allows dApps and traders to get the best DEX liquidity by aggregating multiple markets and offering the best rates

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# SDK for the ParaSwap API



Refer to the documentation of the ParaSwap API: https://developers.paraswap.network



## Features

**Versatility**: works with both [web3](https://www.npmjs.com/package/web3) and [ethers](https://www.npmjs.com/package/ethers) without direct dependency



**Canonical**: bring only the functions you actually need



**Lightweight**: 400B Gzipped for the minimal variant



## Installing ParaSwap SDK



```bash

yarn add @paraswap/sdk

```



## Using ParaSwap SDK



There are multiple ways to use ParaSwap SDK, ranging from a simple construct-and-use approach to a fully composable _bring what you need_ approach which allows for advanced tree-shaking and minimizes bundle size.



### Simple SDK



Can be created by providing `chainId` and either `axios` or `window.fetch` (or alternative `fetch` implementation), and an optional `version` (`'5'` or `'6.1'`) parameter that corresponds to the API version SDK will be making requests to. The resulting SDK will be able to use all methods that query the API.



```ts

  import { constructSimpleSDK } from '@paraswap/sdk';

  import axios from 'axios';



  // construct minimal SDK with fetcher only

  const paraSwapMin = constructSimpleSDK({chainId: 1, axios});

  // or

  const paraSwapMin = constructSimpleSDK({chainId: 1, fetch: window.fetch, version: '5'});



  const ETH = '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee';

  const DAI = '0x6B175474E89094C44Da98b954EedeAC495271d0F';



  async function swapExample() {

    //                                     or any other signer/provider 

    const signer: JsonRpcSigner = ethers.Wallet.fromMnmemonic('__your_mnemonic__');

    const senderAddress = signer.address;



    const priceRoute = await paraSwapMin.swap.getRate({

      srcToken: ETH,

      destToken: DAI,

      amount: srcAmount,

      userAddress: senderAddress,

      side: SwapSide.SELL,

    });



    const txParams = await paraSwapMin.swap.buildTx(

      {

        srcToken,

        destToken,

        srcAmount,

        destAmount,

        priceRoute,

        userAddress: senderAddress,

        partner: referrer,

      }     

    );



    const transaction = {

      ...txParams,

      gasPrice: '0x' + new BigNumber(txParams.gasPrice).toString(16),

      gasLimit: '0x' + new BigNumber(5000000).toString(16),

      value: '0x' + new BigNumber(txParams.value).toString(16),

    };



    const txr = await signer.sendTransaction(transaction);

  }

```



If optional `providerOptions` is provided as the second parameter, then the resulting SDK will also be able to approve Tokens for swap.



```ts

  // with ethers.js

  const providerOptionsEther = {

    ethersProviderOrSigner: provider, // JsonRpcProvider

    EthersContract: ethers.Contract,

    account: senderAddress,

  };



  // or with web3.js

  const providerOptionsWeb3 = {

    web3, // new Web3(...) instance

    account: senderAddress,

  };



  const paraSwap = constructSimpleSDK({chainId: 1, axios}, providerOptionsEther);



  // approve token through sdk

  const txHash = await paraSwap.approveToken(amountInWei, DAI);



  // await tx somehow

  await provider.waitForTransaction(txHash);

```



### Full SDK 

```typescript

import { constructFullSDK, constructAxiosFetcher, constructEthersContractCaller } from '@paraswap/sdk';



const signer = ethers.Wallet.fromMnmemonic('__your_mnemonic__'); // or any other signer/provider 

const account = '__signer_address__';



const contractCaller = constructEthersContractCaller({

  ethersProviderOrSigner: signer,

  EthersContract: ethers.Contract,

}, account); // alternatively constructWeb3ContractCaller

const fetcher = constructAxiosFetcher(axios); // alternatively constructFetchFetcher



const paraswap = constructFullSDK({

  chainId: 1,

  fetcher,

  contractCaller,

});

```



### Partial SDK

For bundle-size savvy developers, you can construct a lightweight version of the SDK and bring only the functions you need.



e.g. for only getting rates and allowances:



```typescript

import { constructPartialSDK, constructFetchFetcher, constructGetRate, constructGetBalances } from '@paraswap/sdk';



const fetcher = constructFetchFetcher(window.fetch);



const minParaSwap = constructPartialSDK({

  chainId: 1,

  fetcher,

}, constructGetRate, constructGetBalances);



const priceRoute = await minParaSwap.getRate(params);

const allowance = await minParaSwap.getAllowance(userAddress, tokenAddress);

```



### Legacy

The `ParaSwap` class is exposed for backwards compatibility with previous versions of the SDK.



```typescript

import { ParaSwap } from '@paraswap/sdk';

import axios from 'axios';

import Web3 from 'web3';



const web3Provider = new Web3(window.ethereum);

const account = '__user_address__';



const paraswap = new ParaSwap({chainId: 1, web3Provider, account, axios});



```



Or you can use `ethers` in place of `web3`



```typescript

import { ParaSwap } from '@paraswap/sdk';

import { ethers } from "ethers";



const ethersProvider = new ethers.providers.Web3Provider(window.ethereum)

const account = '__user_address__';



const paraswap = new ParaSwap({

  chainId: 1,

  account,

  ethersDeps: {

    ethersProviderOrSigner: ethersProvider;

    EthersContract: ethers.Contract;

  },

  fetch: window.fetch,

 });



```



By analogy to ```constructPartialSDK```, you can leverage a lightweight version of the sdk for fetching only.



```typescript

import { ParaSwap } from '@paraswap/sdk';



const paraswap = new ParaSwap({chainId: 1, fetch: window.fetch});



```



Refer to [this README for depecreated documentation](https://github.com/paraswap/paraswap-sdk/blob/c4c70c674fb2be4ec528064649d992d4b38c654b/README.md) for functions usage.



Refer to [SDK API documentation](docs/md/modules.md) for detailed documentation on the methods provided in this SDK.



## Tests



To run `yarn test` it is necessary to provide `PROVIDER_URL=` environment variable.

If it is necessary to run tests against a different API endpoint, provide `API_URL=url_to_API` environment variable.