# Giwa API Quickstart

> How to get started building on Giwa using Alchemy

> For the complete documentation index, see [llms.txt](/docs/llms.txt).

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</Tip>

Giwa is an Ethereum Layer 2 optimistic rollup built on the OP Stack by Dunamu, the parent company of South Korean crypto exchange Upbit. Giwa targets one-second block times and full EVM compatibility, so existing Solidity contracts and Ethereum tooling work out of the box.

The Giwa API is a collection of JSON-RPC methods that lets you interact with the Giwa network. If you're familiar with Ethereum's JSON-RPC API, working with Giwa will feel immediately familiar.

## Send your first request on Alchemy

Let's use the [`viem`](https://www.npmjs.com/package/viem) package to create a Giwa client connected to Alchemy and fetch the latest block number.

<CodeGroup>
  ```text npm
  npm install --save viem
  ```

  ```text yarn
  yarn add viem
  ```
</CodeGroup>

## Create a client connected to Alchemy

<CodeGroup>
```js
import { createPublicClient, http } from "viem";
import { giwaSepolia } from "viem/chains";

const client = createPublicClient({
  chain: giwaSepolia,
  transport: http("https://giwa-sepolia.g.alchemy.com/v2/YOUR_ALCHEMY_API_KEY"),
});
```
</CodeGroup>

Now that you've created a client connected to Alchemy, you can continue with some basics:

## Get the latest block number

<CodeGroup>
```js
const blockNumber = await client.getBlockNumber();
console.log("Current block number:", blockNumber);
```
</CodeGroup>

## Get an address balance

<CodeGroup>
```js
const balance = await client.getBalance({ address: "0xab5801a7d398351b8be11c439e05c5b3259aec9b" });
console.log("Balance (ETH):", Number(balance) / 1e18);
```
</CodeGroup>

## Read block data

<CodeGroup>
```js
const block = await client.getBlock({
  blockNumber: blockNumber, // from previous example
});
console.log(block);
```
</CodeGroup>

## Fetch a transaction by hash

<CodeGroup>
```js
const tx = await client.getTransaction({ hash: "0xYOUR_TX_HASH" });
console.log(tx);
```
</CodeGroup>

## Fetch a transaction receipt

<CodeGroup>
```js
const receipt = await client.getTransactionReceipt({
  hash: "0xYOUR_TX_HASH"
});
console.log(receipt);
```
</CodeGroup>

# Giwa APIs

For the full list of Giwa APIs, see the [Giwa API Endpoints](/docs/chains#giwa-apis).