# Transactions

## Overview

Ox provides protocol-level primitives for every Ethereum transaction envelope type — from legacy
transactions through [EIP-4844](https://eips.ethereum.org/EIPS/eip-4844) blobs and
[EIP-7702](https://eips.ethereum.org/EIPS/eip-7702) delegations. The
[`TxEnvelope*`](/api/TransactionEnvelope) modules construct, sign, serialize, and deserialize
envelopes locally, with no client required. Recipes end at the network boundary — hand the
serialized payload to a JSON-RPC transport, or use a higher-level client like
[Viem](https://viem.sh) when an application also needs to fill and track transactions.

```ts twoslash
import { Secp256k1, TxEnvelopeEip1559, Value } from 'ox'

// 1. Construct the envelope.
const envelope = TxEnvelopeEip1559.from({
  chainId: 1,
  gas: 21_000n,
  maxFeePerGas: Value.fromGwei('10'),
  maxPriorityFeePerGas: Value.fromGwei('1'),
  nonce: 69n,
  to: '0x70997970c51812dc3a010c7d01b50e0d17dc79c8',
  value: Value.fromEther('1.5'),
})

// 2. Sign over the envelope.
const signature = Secp256k1.sign({
  payload: TxEnvelopeEip1559.getSignPayload(envelope),
  privateKey: '0x...',
})

// 3. Serialize it, ready for `eth_sendRawTransaction`.
const serialized = TxEnvelopeEip1559.serialize(envelope, { signature })
```

<Cards>
  <Card icon="lucide:send" title="Build, Sign & Send" description="Take an envelope from construction to broadcast." to="/guides/transactions/build-sign-send" />

  <Card icon="lucide:layers" title="Choose an Envelope Type" description="Compare Legacy, EIP-2930, EIP-1559, EIP-4844, and EIP-7702 envelopes." to="/guides/transactions/envelope-types" />

  <Card icon="lucide:badge-check" title="Delegate with EIP-7702" description="Sign authorizations and attach delegations to transactions." to="/guides/transactions/eip-7702" />

  <Card icon="lucide:gauge" title="Estimate Fees & Access Lists" description="Work with fee history, gas prices, and access lists." to="/guides/transactions/fees-access-lists" />

  <Card icon="lucide:search" title="Parse & Inspect Transactions" description="Decode raw transactions and convert RPC data to typed objects." to="/guides/transactions/parse-inspect" />

  <Card icon="lucide:database" title="Send Blob Transactions (EIP-4844)" description="Pack data into blobs with KZG commitments and sidecars." to="/guides/transactions/blobs" />
</Cards>