Avalanche is an EVM-compatible blockchain known for its high throughput and low latency. Designed to support the needs of decentralized applications (dApps), Avalanche provides a scalable and efficient environment for deploying Ethereum-based applications with near-instant finality.

The Avalanche C-Chain API facilitates interaction with the Avalanche network through a collection of JSON-RPC methods. Given its compatibility with the Ethereum ecosystem, developers familiar with Ethereum’s JSON-RPC APIs will find working with Avalanche both intuitive and straightforward.

Send Your First Request on Alchemy

Let’s use the viem package to create an Avalanche client connected to Alchemy and fetch the latest block number!

npm install --save viem

Create Client Connected to Alchemy

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import { createPublicClient, http } from "viem"; 
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import { avalanche } from "viem/chains";
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const client = createPublicClient({
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  chain: avalanche,
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  transport: http("https://avax-mainnet.g.alchemy.com/v2/YOUR_ALCHEMY_API_KEY"),
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});

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

Get Latest Block Number

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const blockNumber = await client.getBlockNumber();
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console.log("Current block number:", blockNumber);

Get an Address Balance

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const balance = await client.getBalance({ address: "0xab5801a7d398351b8be11c439e05c5b3259aec9b" });
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console.log("Balance (AVAX):", Number(balance) / 1e18);

Read Block Data

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

Fetch a Transaction by Hash

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const tx = await client.getTransaction({ hash: "0xYOUR_TX_HASH" });
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console.log(tx);

Fetch Transaction Receipt

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const receipt = await client.getTransactionReceipt({
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  hash: "0xYOUR_TX_HASH"
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});
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console.log(receipt);

Avalanche APIs

For the full list of Avalanche APIs, see the Avalanche API Endpoints.