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https://github.com/depayfi/web3-payments

💸 JavaScript library to scan crypto wallets for liquefiable assets and perform cost-effective, auto-converted payments onchain.
https://github.com/depayfi/web3-payments

blockchain cryptocurrency payments web3

Last synced: about 1 month ago
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💸 JavaScript library to scan crypto wallets for liquefiable assets and perform cost-effective, auto-converted payments onchain.

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README 

        
## Quickstart



```

yarn add @depay/web3-payments

```



or 



```

npm install --save @depay/web3-payments

```



Make sure you install all required dependencies too:



```

yarn add @depay/web3-assets @depay/web3-constants @depay/web3-exchanges @depay/web3-tokens ethers decimal.js

```



or if you use npm



```

npm i @depay/web3-assets @depay/web3-constants @depay/web3-exchanges @depay/web3-tokens ethers decimal.js

```



```javascript

import { route } from '@depay/web3-payments'



let paymentRoutes = await route({

  accept: [

    {

      blockchain: 'ethereum',

      token: '0xdAC17F958D2ee523a2206206994597C13D831ec7',

      amount: 20,

      toAddress: '0xb0252f13850a4823706607524de0b146820F2240'

    },{

      blockchain: 'solana',

      token: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',

      amount: 20,

      toAddress: '3Hrw6AsNyJAp71Nkgo4tzJwvGM47DzqMdAtf8ojptkXk'

    }

  ],

  from: {

    ethereum: '0x317D875cA3B9f8d14f960486C0d1D1913be74e90',

    solana: '2UgCJaHU5y8NC4uWQcZYeV9a5RyYLF7iKYCybCsdFFD1'

  }

})

```



## Support



This library supports the following blockchains:



- [Ethereum](https://ethereum.org)

- [BNB Smart Chain](https://www.binance.org/smartChain)

- [Polygon](https://polygon.technology)

- [Solana](https://solana.com)

- [Fantom](https://fantom.foundation)

- [Arbitrum](https://arbitrum.io)

- [Avalanche](https://www.avax.network)

- [Gnosis](https://gnosis.io)

- [Optimism](https://www.optimism.io)

- [Base](https://base.org)

- [Worldchain](https://worldcoin.org/world-chain)



## Platform specific packaging



In case you want to use and package only specific platforms, use the platform-specific package:



### EVM platform specific packaging



```javascript

import { route } from '@depay/web3-payments-evm'

```



Make sure you install all required dependencies for evm specific packaging too:



```

yarn add @depay/web3-blockchains @depay/web3-assets-evm @depay/web3-exchanges-evm @depay/web3-tokens-evm ethers decimal.js

```



or if you use npm



```

npm i @depay/web3-blockchains @depay/web3-assets-evm @depay/web3-exchanges-evm @depay/web3-tokens-evm ethers decimal.js

```



### Solana platform specific packaging



```javascript

import { route } from '@depay/web3-payments-solana'

```



Make sure you install all required dependencies for solana specific packaging too:



```

yarn add @depay/web3-blockchains @depay/web3-assets-solana @depay/web3-exchanges-solana @depay/web3-tokens-solana @depay/solana-web3.js

```



or if you use npm



```

npm i @depay/web3-blockchains @depay/web3-assets-solana @depay/web3-exchanges-solana @depay/web3-tokens-solana @depay/solana-web3.js

```



## Functionalities



### route



Routes payment and returns payment routes:



```javascript

import { route } from '@depay/web3-payments'



let paymentRoutes = await route({

  accept: [{

    blockchain: 'ethereum',

    token: '0xa0bEd124a09ac2Bd941b10349d8d224fe3c955eb',

    amount: 20,

    toAddress: '0xb0252f13850a4823706607524de0b146820F2240'

  }],

  from: {

    ethereum: '0x5Af489c8786A018EC4814194dC8048be1007e390',

  }

})

```



Also allows to pass in multiple accepted means of payment: 



```javascript

import { route } from '@depay/web3-payments'



let paymentRoutes = await route({

  accept: [

    {

      blockchain: 'ethereum',

      token: '0xa0bEd124a09ac2Bd941b10349d8d224fe3c955eb',

      amount: 20,

      toAddress: '0xb0252f13850a4823706607524de0b146820F2240'

    },{

      blockchain: 'bsc',

      token: '0xa0bEd124a09ac2Bd941b10349d8d224fe3c955eb',

      amount: 20,

      toAddress: '0xb0252f13850a4823706607524de0b146820F2240'

    }

  ],

  from: {

    ethereum: '0x5Af489c8786A018EC4814194dC8048be1007e390',

    bsc: '0x5Af489c8786A018EC4814194dC8048be1007e390'

  }

})

```



#### drip routes



If you want to work with intermediate routing results over waiting for all routes to be calculated, you can use the the `drip` option which will drip every single route individually:



```javascript

import { route } from '@depay/web3-payments'



let paymentRoutes = await route({

  drip: (route)=> {

    // yields every single route

  }

})

```



#### fromToken + fromAmount + toToken



In cases where you want to set the `fromToken` and `fromAmount` (instead of the target token and the target amount) when calculating payment routes you can pass `fromToken`, `fromAmount` + `toToken`.



Make sure to NOT pass `token` nor `amount` if you use that option!



```javascript

import { route } from '@depay/web3-payments'



let paymentRoutes = await route({

  accept: [

    {

      blockchain: 'bsc',

      fromAmount: 1,

      fromToken: '0xe9e7cea3dedca5984780bafc599bd69add087d56',

      toToken: '0xa0bEd124a09ac2Bd941b10349d8d224fe3c955eb',

      toAddress: '0xb0252f13850a4823706607524de0b146820F2240'

    }

  ],

  from: { bsc: '0x5Af489c8786A018EC4814194dC8048be1007e390' }

})

```



#### whitelist



Allows only fromTokens (from the sender) that are part of the whitelist:



```javacript

let paymentRoutes = await route({



  whitelist: {

    ethereum: [

      '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', // ETH

      '0xdac17f958d2ee523a2206206994597c13d831ec7', // USDT

      '0x6b175474e89094c44da98b954eedeac495271d0f'  // DAI

    ],

    bsc: [

      '0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', // BNB

      '0xe9e7cea3dedca5984780bafc599bd69add087d56', // BUSD

      '0x55d398326f99059ff775485246999027b3197955'  // BSC-USD

    ]

  }

})



```



#### blacklist



Filters fromTokens to not be used for payment routing:



```javacript

let paymentRoutes = await route({



  blacklist: {

    ethereum: [

      '0x6b175474e89094c44da98b954eedeac495271d0f'  // DAI

    ],

    bsc: [

      '0x55d398326f99059ff775485246999027b3197955'  // BSC-USD

    ]

  }

})



```



#### fee



`route` allows you also to configure a `fee` that is taken from the payment amount and is sent to another receiver (the fee receiver):



```javascript

let paymentRoutes = await route({

  

  accept: [{

    //...

    fee: {

      amount: '3%',

      receiver: '0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'

    }

  }]

})



// splits 0.3 of the amount paid and sends it to the feeReceiver

```



`fee.amount` can be passed as percentage (String with ending %) or as a BigNumber string or as a pure number/decimal



```javascript

let paymentRoutes = await route({

  

  accept: [{

    //...

    fee: {

      amount: '300000000000000000',

      receiver: '0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'

    }

  }]

})

// splits 0.3 of the amount paid and sends it to the feeReceiver

```



```javascript

let paymentRoutes = await route({

  

  accept: [{

    //...

    fee: {

      amount: 0.3,

      receiver: '0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'

    }

  }]

})

// splits 0.3 of the amount paid and sends it to the feeReceiver

```



### routers



Exports basic router information (address and api):



```javascript

import { routers } from '@depay/web3-payments'



routers.ethereum.address // 0xae60aC8e69414C2Dc362D0e6a03af643d1D85b92

```



### plugins



Exports plugin addresses:



```javascript

import { plugins } from '@depay/web3-payments'



plugins.ethereum.payment // 0x99F3F4685a7178F26EB4F4Ca8B75a1724F1577B9

```



## Domain Knowledge



### Payment Routing Priorities



1. If user has a requested token in his wallet, a direct token transfer to the receiver will be prioritized



2. Any token that can be liquidated on decentralized exchange and has already been approved for the DePay router will be second priority



3. All other liquefiable tokens that still require token approval will be prioritized last



## Data Structures



### PaymentRoute



Payment routes are provided in the following structure:



```

{

  blockchain: String (e.g. ethereum)

  fromAddress: String (e.g. '0xd8da6bf26964af9d7eed9e03e53415d37aa96045')

  fromToken: Token (see @depay/web3-tokens)

  fromAmount: BigNumber (e.g. )

  fromDecimals: number (e.g. 18)

  fromBalance: BigNumber (e.g. )

  toToken: Token (see @depay/web3-tokens)

  toAmount: BigNumber (e.g. )

  toDecimals: number (e.g. 18)

  toAddress: String (e.g. '0x65aBbdEd9B937E38480A50eca85A8E4D2c8350E4')

  fee: Object (e.g. undefined or fee object)

  feeAmount: BigNumber (e.g. )

  exchangeRoutes: Array (list of exchange routes offering to convert )

  currentAllowance: BigNumber (e.g. )

  approvalRequired: Boolean (e.g. true)

  approvalTransaction: Transaction (to approve the fromToken being used from the payment router to perform the payment)

  directTransfer: Boolean (e.g. true)

  getTransaction: async (options)=> Transaction (see @depay/web3-wallets for details), options can contain { wallet }

}

```



`approvalRequired`: indicates if a upfront token approval is required in order to perform the payment, make sure you execute `approve` before executing the payment transaction itself.



`currentAllowance`: provides the current set allowance as BigNumber.



`directTransfer`: indicates if the payment does not require any swapping/exchanging.



See [@depay/web3-wallets](https://github.com/DePayFi/web3-wallets#sendtransaction) for details about the transaction format.



## Development



### Get started



```

yarn install

yarn dev

```



## Web3 Payments



The future is [Web3 Payments](https://depay.com/web3-payments).



Blockchains hold the potential to faster, simpler and smarter payments.



Web3 Payments are borderless, peer-to-peer, and support multiple tokens and blockchains.



Accept any asset type that your customers already have in their wallet. [DePay](https://depay.com) is blockchain agnostic and can at any time be extended on any blockchain-specific plugin. Interoperability, scalability & flexibility are the cornerstones of our protocol. Accepting any asset that users already have in their wallets no matter which blockchain these are held on, reduces friction when performing decentralized payments.



### Chain Agnostic (Multichain)



Interoperability is the key principle on which our infrastructure is built. [DePay](https://depay.com) is extensible around any blockchain, ensuring a competitive cross-chain future.



### Permissionless



Interoperability is the key principle on which our infrastructure is built. [DePay](https://depay.com) is extensible around any blockchain, ensuring a competitive cross-chain future.



### Trustless



Most Web3 Payment providers & processors receive payments to wallets that they manage themselves. Only in a further intermediate step are the payments paid out to sellers. [DePay](https://depay.com) does not act as an intermediary. Every intermediate step is replaced by smart contracts which are connected to decentralized liquidity pools. As a result, trust is no longer required.



### Easy to use



Our ambition was to create an even easier user experience than you're used to from shopping in current non-crypto e-commerce stores. We think we've done a good job of that.



### Open Source



Feel free to use & contribute to our codebase at. We're happy to have you look under our hood. The [DePay](https://depay.com) protocol will always remain open source.



### Multichain



[DePay](https://depay.com) calculates payment routes on multiple blockchains simultaneously despite what your wallet is currently connected to. Our software automatically detects & switches the network if required.