# Mode API Quickstart

> How to get started building on Mode using Alchemy

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

<Tip title="Don't have an API key?" icon="star">
  Build faster with production-ready APIs, smart wallets and rollup infrastructure across 70+ chains. Create your free Alchemy API key and{" "}
  <a href="https://dashboard.alchemy.com/signup">get started today</a>.
</Tip>

Mode is an OP Stack–based, EVM-equivalent Ethereum Layer-2 that's growth-focused—sharing sequencer fees with developers (SFS) and rewarding users to power DeFi/AiFi apps.

The Mode API lets you interact with the Mode network through a set of JSON-RPC methods. If you've worked with Ethereum's JSON-RPC APIs, the design will feel familiar.

## Send your first request on Alchemy

Let's use the [`viem`](https://www.npmjs.com/package/viem) package to create a Mode 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 { mode } from "viem/chains";

const client = createPublicClient({
  chain: mode,
  transport: http("https://mode-mainnet.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>

# Mode APIs

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