Transactions

Send Token

Currently, Ramper SDK supports sendToken which is a simple way to send a token to another address from the current logged in wallet.

const sendToken = async (params: Partial<{
  from: string
  to: string
  value: string
  decimal: number
  symbol: string
  network: string
  theme: string
}>) => Promise<boolean>

Example Usage:

import { sendToken } from '@ramper/ethereum'

await sendToken({
  to: '0xa419dfa199Df8651c3f4476546AF5E4CC4E0F73F',
  value: '0.00001',
  network: 'mainnet'
})

RamperSigner

Ramper SDK allows you to request a signed transaction from the user for subsequent broadcasting to the network. Ramper SDK is built around Ether.js and Alchemy but if you'd like to see Ramper SDK support other use cases, let us know on Discord, or email us at [email protected]. In order to broadcast a transaction, you must first set up an Alchemy Provider.

import { ethers } from 'ethers'

const alchemy = new ethers.providers.AlchemyProvider(80001, 'pEWvHrkSkkyWGZmezdGMk_LjYu8DAx1k')

After the user is logged in through Ramper SDK, you can set up a RamperSigner object with the alchemy provider that will eventually collect the user's authorization to sign the requested transaction. 

import { getRamperSigner } from '@ramper/ethereum'

// User must be logged in
const ramperSigner = await getRamperSigner(alchemy)

Sign Transaction

import { TransactionRequest } from '@ethersproject/abstract-provider'

ramperSigner.signTransaction(
    transaction: Deferrable<TransactionRequest>
): Promise<string>

Example usage:

import { getRamperSigner } from '@ramper/ethereum'
import { ethers } from 'ethers'

const alchemy = new ethers.providers.AlchemyProvider(80001, 'pEWvHrkSkkyWGZmezdGMk_LjYu8DAx1k')
const ramperSigner = await getRamperSigner(alchemy)

const value = ethers.utils.parseEther('0.0000001')
const nonce = await alchemy.getTransactionCount('your-wallet-address')
const gasLimit = await alchemy.estimateGas({
  to: '0xa419dfa199Df8651c3f4476546AF5E4CC4E0F73F',
  value: value,
})
const feeData = await alchemy.getFeeData()

try {
    const result = await ramperSigner.signTransaction({
        type: 2,
        from: 'your-wallet-address',
        to: '0xa419dfa199Df8651c3f4476546AF5E4CC4E0F73F',
        value: value,
        chainId: 80001,
        nonce: nonce,
        gasLimit: gasLimit,
        maxFeePerGas: feeData.maxFeePerGas,
        maxPriorityFeePerGas: feeData.maxPriorityFeePerGas,
    })
    console.log('signTransaction result', result)
} catch (e) {
  console.log(e)
}

Send Transaction

import { 
    TransactionRequest, 
    TransactionResponse 
} from '@ethersproject/abstract-provider'

ramperSigner.sendTransaction(
    transaction: Deferrable<TransactionRequest>
): Promise<TransactionResponse>

Example usage:

import { getRamperSigner } from '@ramper/ethereum'
import { ethers } from 'ethers'

const alchemy = new ethers.providers.AlchemyProvider(80001, 'pEWvHrkSkkyWGZmezdGMk_LjYu8DAx1k')
const ramperSigner = await getRamperSigner(alchemy)

const value = ethers.utils.parseEther('0.0000001')
const nonce = await alchemy.getTransactionCount('your-wallet-address')
const gasLimit = await alchemy.estimateGas({
  to: '0xa419dfa199Df8651c3f4476546AF5E4CC4E0F73F',
  value: value,
})
const feeData = await alchemy.getFeeData()

try {
  await ramperSigner.sendTransaction({
    type: 2,
    from: 'your-wallet-address',
    to: '0xa419dfa199Df8651c3f4476546AF5E4CC4E0F73F',
    value: value,
    chainId: 80001,
    nonce: nonce,
    gasLimit: gasLimit,
    maxFeePerGas: feeData.maxFeePerGas,
    maxPriorityFeePerGas: feeData.maxPriorityFeePerGas,
  })
  console.log('sendTransaction result', result)
} catch (e) {
  console.log(e)
}

Sign Message

ramperSigner.signMessage(
    message: Bytes | string
): Promise<string>

Example usage:

import { getRamperSigner } from '@ramper/ethereum'
import { ethers } from 'ethers'

const alchemy = new ethers.providers.AlchemyProvider(80001, 'pEWvHrkSkkyWGZmezdGMk_LjYu8DAx1k')
const ramperSigner = await getRamperSigner(alchemy)

try {
  const message = 'Ramper sign message test'
  const result = await ramperSigner.signMessage(message)
  
  console.log('signMessage result: ', result)
} catch (e) {
  console.log(e)
}

Sign TypedData

import { TypedDataField } from '@ethersproject/abstract-signer'

ramperSigner._signTypedData(
    domain: TypedDataDomain,
    types: Record<string, Array<TypedDataField>>,
    value: Record<string, any>,
  ): Promise<string>

Example usage:

import { getRamperSigner } from '@ramper/ethereum'
import { ethers } from 'ethers'
import { eip712 } from './eip712

const alchemy = new ethers.providers.AlchemyProvider(80001, 'pEWvHrkSkkyWGZmezdGMk_LjYu8DAx1k')
const ramperSigner = await getRamperSigner(alchemy)

try {
  const message = 'Ramper signTypedData test'
  const result = await ramperSigner.signTypedData(
    eip712.example.domain, 
    eip712.example.types, 
    eip712.example.value
  )
  
  console.log('signTypedData result: ', result)
} catch (e) {
  console.log(e)
}

eip712.ts

const example = {
  domain: {
    name: 'Ether Mail',
    version: '1',
    chainId: 1,
    verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC',
  },

  // The named list of all type definitions
  types: {
    Person: [
      { name: 'name', type: 'string' },
      { name: 'wallet', type: 'address' },
    ],
    Mail: [
      { name: 'from', type: 'Person' },
      { name: 'to', type: 'Person' },
      { name: 'contents', type: 'string' },
    ],
  },

  // The data to sign
  value: {
    from: {
      name: 'Cow',
      wallet: '0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826',
    },
    to: {
      name: 'Bob',
      wallet: '0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB',
    },
    contents: 'Hello, Bob!',
  },
}

export const eip712 = {
  example,
}

Error Handling

Use a try/catch block to detect if the user canceled the transaction or the transaction failed to be broadcasted successfully.

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