Accounts & HBAR

Name: Hedera
Price range: $

STAKING

Stake the HBAR balance of accounts and contracts to network nodes – no minimums, lock-up periods, bonding, or slashing

(v0.27 - HIP-406)

Automatic Account Creation with HBAR

Send HBAR to the alias of an account ID that does not yet exist to automatically create a Hedera account

(v0.21 - HIP-32)

Automatic Account Creation with Tokens

Send fungible and non-fungible native tokens to the alias of an account ID that does not yet exist to automatically create a Hedera account

(v0.31 - HIP-542)

Learn more about HBAR

Technical documentation for accounts and HBAR

STAKE HBAR VIA HASHSCAN NOW

Carbon-Negative Solidity Contracts

Smart Contracts 2.0

Deploy Solidity-based, carbon-negative, low-cost, and scalable contracts

(v0.22 - HIP-25, HIP-185)

CREATE2 Opcode

Create contract factories that deploy other smart contracts (factory patterns) to enable use cases like decentralized exchanges (DEX)

(v0.23 - HIP-329)

Random Number Generation

Generate a random number for use cases like games and lotteries by just calling a simple function

(v0.28 - HIP-351)

CONTRACT RENEWAL

Keep your contracts current on the network by extending the expiration time with a renewal fee payment

(v0.30 - HIP-16, HIP-372)

Learn more about Smart Contracts

Technical Documentation for Smart Contracts

Migrating to Hedera

ECDSA Keys

Create Hedera accounts that have ECDSA keys to migrate your applications while using libraries and tools you’re already familiar with

(v0.21 - HIP-222)

ETHEREUM TRANSACTIONS

Migrate your applications to Hedera by deploying contracts with the most ubiquitous EVM ecosystem libraries and tools you already know

(v0.26 - HIP-410)

Virtual Block Numbers

Get block information to integrate EVM-based tooling, explorers, exchanges, and wallet with Hedera

(v0.26 - HIP-415)

Zero Token Values in Contracts

Submit transactions with 0 tokens to Hedera without having to implement if statements or qualification logic to check for 0 values

(v0.31 - HIP-564)

Documentation for Hedera JSON-RPC Relay

GitHub Repository for Hedera JSON-RPC Relay

// create constructor parameters from the signature of the constructor + parameter values
// .slide(2) to remove '0x' from the result
let constructParameters = web3.eth.abi.encodeParameters(['string'], [constructMessage]).slice(2);
// convert to a Uint8Array
const constructorParametersAsUint8Array = Buffer.from(constructParameters, 'hex');
// Create the contract
const contractTransactionResponse = await new ContractCreateTransaction()
   // Set the parameters that should be passed to the contract constructor
   // using the output from the web3.js library
   .setConstructorParameters(constructorParametersAsUint8Array)
   // Set gas to create the contract
   .setGas(100_000)
   // The contract bytecode must be set to the file ID containing the contract bytecode
   .setBytecodeFileId(fileId)
   .execute(client);
 
// Fetch the receipt for the transaction that created the contract
const contractReceipt = await contractTransactionResponse.getReceipt(client);
 
// The contract ID is located on the transaction receipt
const contractId = contractReceipt.contractId

Hedera Services with Solidity

Token Service Libraries

Transfer, mint, burn, associate, and dissociate native Hedera tokens using Solidity smart contracts

(v0.22 - HIP-206)

Library for Creating Tokens

Create native Hedera tokens with or without custom fees using Solidity smart contracts

(v0.25 - HIP-358)

Additional Token Service Libraries

Access all other Hedera Token Service (HTS) capabilities to fully manage native tokens using Solidity smart contracts

(v0.30 - HIP-514)

ERC Functions with Hedera Tokens

Interact with fungible and non-fungible native Hedera tokens in your Solidity contracts using ERC-20 and ERC-721 standard functions

(v0.24 - HIP-218)

Technical Documentation for Token Service Solidity Libraries

Asset Approvals & Allowances

Allowances with SDK

Enable third-party accounts to transfer assets on your behalf by approving allowances with the Hedera SDKs

(v0.25 - HIP-336)

Allowances with Solidity

Enable third-party accounts to transfer assets on your behalf by approving allowances with Token Service Libraries and ERC-20/721 standard functions

(v0.26 - HIP-376, HIP-514)

Schedule Approvals and Allowances

Submit an allowance approval transaction once all required signatures are collected

(v0.30 - HIP-336)

Technical Documentation for Allowances with Hedera SDKs

Technical Documentation for Allowances with Solidity

export async function hbarAllowanceFcn(owner, spender, allowBal, pvKey, client) {
   const allowanceTx = new AccountAllowanceApproveTransaction().approveHbarAllowance(owner, spender, allowBal).freezeWith(client);
   const allowanceSign = await allowanceTx.sign(pvKey);
   const allowanceSubmit = await allowanceSign.execute(client);
   const allowanceRx = await allowanceSubmit.getReceipt(client);
 
   return allowanceRx;
}

export async function ftAllowanceFcn(tId, owner, spender, allowBal, pvKey, client) {
   const allowanceTx = new AccountAllowanceApproveTransaction().approveTokenAllowance(tId, owner, spender, allowBal).freezeWith(client);
   const allowanceSign = await allowanceTx.sign(pvKey);
   const allowanceSubmit = await allowanceSign.execute(client);
   const allowanceRx = await allowanceSubmit.getReceipt(client);

   return allowanceRx;
}

export async function nftAllowanceFcn(tId, owner, spender, nft2Approve, pvKey, client) {
   const allowanceTx = new AccountAllowanceApproveTransaction()
       // .approveTokenNftAllowanceAllSerials(tId, owner, spender) // Can approve all serials under a NFT collection
       .approveTokenNftAllowance(nft2Approve[0], owner, spender) // Or can approve individual serials under a NFT collection
       .approveTokenNftAllowance(nft2Approve[1], owner, spender)
       .approveTokenNftAllowance(nft2Approve[2], owner, spender)
       .freezeWith(client);
   const allowanceSign = await allowanceTx.sign(pvKey);
   const allowanceSubmit = await allowanceSign.execute(client);
   const allowanceRx = await allowanceSubmit.getReceipt(client);
   return allowanceRx;
}

Tokenize Everything

Unlimited Token Associations

Associate a Hedera account with an unlimited number of native tokens

(v0.25 - HIP-367)

Exemption from Custom Fees

Optionally exempt all fee collectors from paying custom fees when exchanging units of a native token

(v0.31 - HIP-573)

Learn more about the Hedera Token Service

Technical Documentation for the Hedera Token Service

What’s New in Hedera