Build, sign, and submit Hedera transactions including HBAR transfers, token operations, and smart contract calls to the Hedera network.
---
name: hedera-tx-builder
description: Build and sign Hedera transactions. Use for: (1) Creating HBAR transfers, (2) Token operations, (3) Smart contract calls, (4) Submitting to Hedera network.
---
# Hedera Transaction Builder
## Setup
```bash
npm install @hashgraph/sdk
```
## Client Setup
```typescript
import { Client, AccountBalanceQuery, Hbar } from '@hashgraph/sdk';
const client = Client.forMainnet();
// Or for testnet:
const client = Client.forTestnet();
```
## Transfer HBAR
```typescript
import { TransferTransaction, Hbar } from '@hashgraph/sdk';
const tx = new TransferTransaction()
.addHbarTransfer(fromAccountId, new Hbar(-100)) // send
.addHbarTransfer(toAccountId, new Hbar(100)) // receive
.setTransactionMemo("Payment for goods");
// Sign with hashpack or operator
const signTx = await tx.sign(operatorKey);
const result = await signTx.execute(client);
```
## Key Transaction Types
### AccountCreate
```typescript
new AccountCreateTransaction()
.setKey(publicKey)
.setInitialBalance(new Hbar(10))
.setAccountMemo("My account");
```
### TokenAssociate
```typescript
new TokenAssociateTransaction()
.setAccountId(accountId)
.setTokenIds([tokenId1, tokenId2]);
```
### TopicMessage
```typescript
new TopicMessageTransaction()
.setTopicId(topicId)
.setMessage("Hello Hedera!");
```
## Network Endpoints
- **Mainnet**: `https://mainnet.hashio.io/api`
- **Testnet**: `https://testnet.hashio.io/api`
## Important Concepts
- **Hbar**: 1 HBAR = 100,000,000 tinybars
- **Account ID**: Format `shard.realm.num` (e.g., `0.0.12345`)
- **Transaction Fee**: Small HBAR fee for each transaction
- **Transaction Valid Duration**: 180 seconds by default
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