EVM

EVM chains like Ethereum, Polygon, Base, etc support the use of templates to broadcast transactions. Select the following kind:

• Evm: Use this template if you don't want to worry about gas parameters.

• Eip1559: Use this template to interact with chains that support the EIP-1559 gas standard.

• Transaction: broadcasts a fully serialized EVM transaction.

Basic Template

Field	Description	Type - Optional
kind	Evm	String
to	Blockchain address of target contract or payee.	String
value	Amount of the native currency to transfer denominated in WEI.	String (optional)
data	Encoded hex string indicating which function in the smart contract to call with which parameters. Can also be an entire encoded contract in the case of contract deployment.	String (optional)
nonce	The transaction number to guarantee idempotency. If omitted, it will be provided automatically. Note the same nonce can be submitted multiple times with a higher maxFeePerGas to "overwrite" existing transactions in the mempool.	Integer (optional)
externalId	A unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).	String (optional)

{
    "kind": "Evm",
    "to": "0x00fb58432ef9d418bf6688bcf0a226d2fcaa18e2",
    "data": "0x40d097c3000000000000000000000000d2f77f85a50cdd650ca562f3a180284e1d5b4934",
}

EIP-1559 Template

Use this template to adjust the maxFeePerGas and maxPriorityFeePerGas of an EIP-1559 type-2 transaction. Keep in mind that not all EVM compatible chains support this standard.

Field	Description	Type - Optional
kind	Eip1559	String
to	Blockchain address of target contract or payee.	String
value	Amount of the native currency to transfer denominated in WEI.	String (optional)
data	Encoded hex string indicating which function in the smart contract to call with which parameters. Can also be an entire encoded contract in the case of contract deployment.	String (optional)
nonce	The transaction number to guarantee idempotency. If omitted, it will be provided automatically. Note the same nonce can be submitted multiple times with a higher maxFeePerGas to "overwrite" existing transactions in the mempool.	Integer (optional)
gasLimit	The maximum amount of gas that can be spent for executing the transaction. If omitted, it will be calculated automatically.	String (optional)
maxPriorityFeePerGas	The maximum amount of gas to be included as a tip to the validator. If omitted, it will be calculated automatically.	String (optional)
maxFeePerGas	The maximum amount for gas willing to be paid for the transaction. If omitted, it will be calculated automatically.	String (optional)
externalId	A unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).	String (optional)

{
    "kind": "Eip1559",
    "to": "0x00fb58432ef9d418bf6688bcf0a226d2fcaa18e2",
    "data": "0x40d097c3000000000000000000000000d2f77f85a50cdd650ca562f3a180284e1d5b4934",
    "maxFeePerGas": "1626000000000",
    "maxPriorityFeePerGas": "1332000000000"
}

Transaction

Signs an unsigned transaction and broadcasts it to chain.

Property	Description	Type - Optional
kind	Transaction	String
transaction	The unsigned hex encoded transaction as shown below	String
externalId	A unique ID from your system. It can be leveraged to be used as an idempotency key (read more here).	String (optional)

{
  "kind": "Transaction",
  "transaction": "0x02e783aa36a71503850d40e49def82520894e5a2ebc128e262ab1e3bd02bffbe16911adfbffb0180c0"
}

Typescript Example with Ethers

First install the Ethers JS. You can find the full documentation here: https://docs.ethers.org/v6/

Here a code sample to broadcast a transaction via the Dfns TypeScript SDK:

import { parseUnits, Transaction } from 'ethers'

const walletId = 'wa-6lbfv-9esgj-xxxxxxxxxxxxxxxx'

const transaction = Transaction.from({
  to: '0xa238b6008Bc2FBd9E386A5d4784511980cE504Cd',
  value: '1',
  gasLimit: '21000',
  maxPriorityFeePerGas: parseUnits('5', 'gwei'),
  maxFeePerGas: parseUnits('20', 'gwei'),
  nonce: 3,
  type: 2,
  chainId: 11155111,
})

const res = await dfnsClient.wallets.broadcastTransaction({
  walletId,
  body: { kind: 'Transaction', transaction: transaction.unsignedSerialized },
})