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On this page
  • ContractCreateFlow()
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  • ContractCreateTransaction()
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  • Get transaction values

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  1. SDKs & APIs
  2. SDKs
  3. Smart Contract Service

Create a smart contract

PreviousDelegate Contract IDNextUpdate a smart contract

Last updated 9 months ago

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A transaction that creates a new smart contract instance. After the contract is created you can get the new contract ID by requesting the receipt of the transaction. To create the solidity smart contract, you can use or another compiler. After you have the hex-encoded bytecode of the smart contract you need to store that on a file using the . Then you will create the smart contract instance that will run the bytecode stored in the Hedera file, referenced by file ID. Alternatively, you can use the ContractCreateFlow() API to create the file storing the bytecode and contract in a single step.

The constructor will be executed using the given amount of gas, and any unspent gas will be refunded to the paying account. Constructor inputs are passed in the constructorParameters.

If this constructor stores information, it is charged gas to store it. There is a fee in hbars to maintain that storage until the expiration time, and that fee is added as part of the transaction fee.

Solidity Support

The latest version of Solidity is supported on all networks (v0.8.9).

Smart Contract State Size and Gas Limits

The value pairs are 16,384,000 (~100 MB). The system gas throttle is 15 million gas per second. Contract call and contract create are throttled at 8 million gas per second.

Admin Key Support for Contracts

With , contracts now support Admin Key settings. Set an Admin Key during the ContractCreate transaction to manage and update token properties. For frictionless-airdrop enabled contracts, set maxAutoAssociations during the ContractCreate transaction, ensuring that balance and associations can be managed with a valid Admin Key.

Transaction Signing Requirements

  • The client operator account is required to sign the transaction.

  • The admin key, if specified.

  • The key of the autorenewal account, if specified.

Transaction Fees

  • Please see the transaction and query table for the base transaction fee.

  • Please use the to estimate the cost of your transaction fee.

Smart Contract Properties

Field
Description

Admin Key

Sets the state of the instance and its fields can be modified arbitrarily if this key signs a transaction to modify it. If this is null, then such modifications are not possible, and there is no administrator that can override the normal operation of this smart contract instance. Note that if it is created with no admin keys, then there is no administrator to authorize changing the admin keys, so there can never be any admin keys for that instance.

Gas

The gas to run the constructor.

Initial Balance

The initial number of hbars to put into the cryptocurrency account associated with and owned by the smart contract.

Byte Code File

The file containing the hex encoded smart contract byte code.

Staked ID

Decline Rewards

Auto Renew Account ID

An account to charge for auto-renewal of this contract. If not set, or set to an account with zero hbar balance, the contract's own hbar balance will be used to cover auto-renewal fees.

Auto Renew Period

The period that the instance will charge its account every this many seconds to renew.

Automatic Token Associations

The maximum number of tokens that this contract can be automatically associated with (i.e., receive air-drops from).

Constructor Parameters

The constructor parameters to pass.

Memo

The memo to be associated with this contract. (max 100 bytes)

ContractCreateFlow()

The ContractCreateFlow()streamlines the creation of a contract by taking the bytecode of the contract and creating the file on Hedera to store the bytecode for you.

Methods

Method
Type

setBytecode(<bytecode>)

byte

setBytecode(<bytecode>)

String

setBytecode(<bytecode>)

ByteString

setMaxChunks(<maxChunks)

int

//Create the transaction
ContractCreateFlow contractCreate = new ContractCreateFlow()
     .setBytecode(bytecode)
     .setGas(100_000);

//Sign the transaction with the client operator key and submit to a Hedera network
TransactionResponse txResponse = contractCreate.execute(client);

//Get the receipt of the transaction
TransactionReceipt receipt = txResponse.getReceipt(client);

//Get the new contract ID
ContractId newContractId = receipt.contractId;
        
System.out.println("The new contract ID is " +newContractId);
//SDK Version: v2.10.0-beta.1
//Create the transaction
const contractCreate = new ContractCreateFlow()
    .setGas(100000)
    .setBytecode(bytecode);

//Sign the transaction with the client operator key and submit to a Hedera network
const txResponse = contractCreate.execute(client);

//Get the receipt of the transaction
const receipt = (await txResponse).getReceipt(client);

//Get the new contract ID
const newContractId = (await receipt).contractId;
        
console.log("The new contract ID is " +newContractId);
//SDK Version: v2.11.0-beta.1
//Create the transaction
contractCreate := hedera.NewContractCreateFlow().
		SetGas(100000).
		SetBytecode(byteCode)

//Sign the transaction with the client operator key and submit to a Hedera network
txResponse, err := contractCreate.Execute(client)
if err != nil {
		panic(err)
}

//Request the receipt of the transaction
receipt, err = txResponse.GetReceipt(client)
if err != nil {
		panic(err)
}

//Get the topic ID
newContractId := *receipt.ContractID

fmt.Printf("The new topic ID is %v\n", newContractId)
//SDK Version: 2.11.0-beta.1

ContractCreateTransaction()

Creates a smart contract instance using the file ID of the contract bytecode.

Constructor
Description

new ContractCreateTransaction()

Initializes the ContractCreateTransaction() object

Methods

Method
Type
Requirement

setGas(<gas>)

long

Required

setBytecodeFileId(<fileId>)

Required

setInitialBalance(<initialBalance>)

Hbar

Optional

setAdminKey(<keys>)

Key

Optional

setConstructorParameters(<constructorParameters>)

byte [ ]

Optional

setConstructorParameters(<constructorParameters>)

ContractFunctionParameters

Optional

setContractMemo(<memo>)

String

Optional

setStakedNodeId(<stakedNodeId>)

long

Optional

setStakedAccountId(<stakedAccountId>)

AccountId

Optional

setDeclineStakingReward(<declineStakingReward>)

boolean

Optional

setAutoRenewAccountId(<accountId)

AccountId

Optional

setAutoRenewPeriod(<autoRenewPeriod>)

Duration

Optional

setMaxAutomaticTokenAssociations()

int

Optional

//Create the transaction
ContractCreateTransaction transaction = new ContractCreateTransaction()
    .setGas(100_000)
    .setBytecodeFileId(bytecodeFileId);
    
//Modify the default max transaction fee (default: 1 hbar)
ContractCreateTransaction modifyTransactionFee = transaction.setMaxTransactionFee(new Hbar(16));

//Sign the transaction with the client operator key and submit to a Hedera network
TransactionResponse txResponse = modifyTransactionFee.execute(client);

//Get the receipt of the transaction
TransactionReceipt receipt = txResponse.getReceipt(client);

//Get the new contract ID
ContractId newContractId = receipt.contractId;
        
System.out.println("The new contract ID is " +newContractId);
//v2.0.0
//Create the transaction
const transaction = new ContractCreateTransaction()
    .setGas(100_000)
    .setBytecodeFileId(bytecodeFileId);

//Modify the default max transaction fee (default: 1 hbar)
const modifyTransactionFee = transaction.setMaxTransactionFee(new Hbar(16));

//Sign the transaction with the client operator key and submit to a Hedera network
const txResponse = await modifyTransactionFee.execute(client);

//Get the receipt of the transaction
const receipt = await txResponse.getReceipt(client);

//Get the new contract ID
const newContractId = receipt.contractId;
        
console.log("The new contract ID is " +newContractId);
//Create the transaction
transaction := hedera.NewContractCreateTransaction().
		SetGas(100000).
		SetBytecodeFileID(byteCodeFileID)

//Sign the transaction with the client operator key and submit to a Hedera network
txResponse, err := transaction.Execute(client)
if err != nil {
		panic(err)
}

//Request the receipt of the transaction
receipt, err = txResponse.GetReceipt(client)
if err != nil {
		panic(err)
}

//Get the topic ID
newContractId := *receipt.ContractID

fmt.Printf("The new topic ID is %v\n", newContractId)
//v2.0.0

Get transaction values

Method
Type
Requirement

getAdminKey(<keys>)

Key

Optional

getGas(<gas>)

long

Optional

getInitialBalance(<initialBalance>)

Hbar

Optional

getBytecodeFileId(<fileId>)

FileId

Optional

getProxyAccountId(<accountId>)

AccountId

Optional

getConstructorParameters(<constructorParameters>)

ByteString

Optional

getContractMemo(<memo>)

String

Optional

getDeclineStakingReward()

boolean

Optional

getStakedNodeId()

long

Optional

getStakedAccountId()

AccountId

Optional

getAutoRenewAccountId()

AccountId

Required

getAutoRenewPeriod()

Duration

Required

//Create the transaction
ContractCreateTransaction transaction = new ContractCreateTransaction()
    .setGas(500)
    .setBytecodeFileId(bytecodeFileId)
    .setAdminKey(adminKey);

//Get admin key
transaction.getAdminKey()

//v2.0.0
//Create the transaction
const transaction = await new ContractCreateTransaction()
    .setGas(500)
    .setBytecodeFileId(bytecodeFileId)
    .setAdminKey(adminKey);

//Get admin key
transaction.getAdminKey()

//v2.0.0
//Create the transaction
transaction := hedera.NewContractCreateTransaction().
		SetGas(500).
		SetBytecodeFileID(byteCodeFileID).
		SetAdminKey(adminKey)

//Get admin key
transaction.GetAdminKey()

//v2.0.0

The node account or node ID to which this contract account is staking to. See Note: Accounts cannot stake to contract accounts. This will fixed in a future release.

Some contracts may choose to stake their hbars and decline receiving rewards. If set to true, the contract account will not earn rewards when staked. The default value is false. See

First, a FileCreateTransaction() will be executed to create a file on Hedera to store the specified contract bytecode. Then, the ContractCreateTransaction() will be executed to create the contract instance on Hedera. Lastly, a will be executed to remove the file.

The response will return the contract create transaction information like the new contract ID. You will not get the ID of the file that was created that stored your contract bytecode. If you would like to know the file ID of your contract bytecode, you can and use the ContractCreateTransaction() API directly.

Note: Please refer to for a complete list of applicable methods.

FileDeleteTransaction()
create a file
ContractCreateTransaction()
HIP-406.
HIP-406.
remix
Solidity
Hedera File Service
max contract key
HIP-904
Hedera fee estimator
fees
FileId