> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainbase.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Web3 API

<Note>
  📘 **Don’t have an API key?**

  Go to [console.chainbase.com](https://console.chainbase.com/) to create an account and a new API key.
</Note>

Simplifies your web3 development process with seamless access to on-chain and off-chain data.

## What is Web3 API?

The Chainbase Web3 API is an API suite that simplifies your web3 development process with seamless access to on- and off-chain data. No matter what you're building, our Web3 API will provide the necessary data support, including balance, transaction history, ownership, and price information.

## Web3 API Features

Chainbase lets you easily and instantly look up multi-chain, multi-asset balances, transfer history, prices, etc. No indexing is required!

<CardGroup cols={3}>
  <Card title="Basic API" href="/api-reference/web3-api/basic/block/get-block-by-number" />

  <Card title="NFT API" href="/api-reference/web3-api/nft/nft-metadata/get-nft-metadata" />

  <Card title="Token API" href="/api-reference/web3-api/token/market-data/get-token-price-history" />

  <Card title="Balance API" href="/api-reference/web3-api/balance/nft-balances/get-nfts-owned-by-address" />

  <Card title="Domain API" href="/api-reference/web3-api/domain/ens-domain-endpoints/get-ens-domains" />
</CardGroup>

## Built for Web3 Use Cases

The advanced feature set of our Web3 APIs means it can support use case, including:

* NFT Marketplaces
* Wallets
* Block Explorers
* DeFi portfolio Trackers
* Analytics & Reporting
* DAO Governance Tools
* Gaming

## Supported Chains

We will continue to add support for new blockchains for Web3 API. If there is a chain that you wish to support but we do not, please let us know by [reaching us](http://chainbase.com/help).

<table>
  <thead>
    <tr>
      <th style={{ width: "150px" }}>Chain</th>
      <th style={{ width: "60%" }}>Network ID</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>Ethereum</td>
      <td>1</td>
    </tr>

    <tr>
      <td>Polygon</td>
      <td>137</td>
    </tr>

    <tr>
      <td>BSC</td>
      <td>56</td>
    </tr>

    <tr>
      <td>Avalanche</td>
      <td>43114</td>
    </tr>

    <tr>
      <td>Arbitrum One</td>
      <td>42161</td>
    </tr>

    <tr>
      <td>Optimism</td>
      <td>10</td>
    </tr>

    <tr>
      <td>Base</td>
      <td>8453</td>
    </tr>

    <tr>
      <td>zkSync</td>
      <td>324</td>
    </tr>

    <tr>
      <td>Merlin</td>
      <td>4200</td>
    </tr>
  </tbody>
</table>

<div
  style={{
display: "flex",
columnGap: "2rem",
rowGap: "1rem",
flexWrap: "wrap",
}}
>
  {[
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Ethereum.png",
        name: "Ethereum",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Polygon.png",
        name: "Polygon",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/BSC.png",
        name: "BNB Chain",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Fantom.png",
        name: "Fantom",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Avalanche.png",
        name: "Avalanche",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Arbitrum.png",
        name: "Arbitrum",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/Optimism.png",
        name: "Optimism",
      },
      {
        link: "https://platform.chainbase.com/assets/rpcService/multiChain/zkSync.png",
        name: "zkSync",
      },
    ].map((v) => (
      <div
        style={{
          backgroundColor: "#fff",
          width: "150px",
          height: "140px",
          display: "flex",
          flexDirection: "column",
          alignItems: "center",
          justifyContent: "center",
          gap: "0.5rem",
          border: "2px solid #d9f0fa",
          borderRadius: "12px",
        }}
      >
        <img style={{ margin: "0px" }} width="60px" src={v.link} />
        <span style={{ color: "#000" }}>{v.name}</span>
      </div>
    ))}
</div>