Chains

Learn how to discover supported blockchain networks in Aave v4.

Chain Structure

Chain data provides information about blockchain networks supported by Aave v4, including:

Identification: name, chain ID, icon URL
Configuration: explorer URL, whether it is a testnet
Native token details: wrapped token address and metadata

TypeScript
GraphQL

The following TypeScript interface illustrates the core Chain type:

interface Chain {  __typename: "Chain";  chainId: ChainId;  name: string;  icon: string;  rpcUrl: string;  explorerUrl: string;  isTestnet: boolean;  nativeWrappedToken: EvmAddress;  nativeInfo: TokenInfo;  nativeGateway: EvmAddress;  signatureGateway: EvmAddress;}

Listing Supported Chains

Discover all blockchain networks supported by Aave v4.

React
TypeScript
GraphQL

Use the useChains hook to fetch a list of supported chains.

import { type ChainsFilter, useChains } from "@aave/react";
function ChainsList({ filter }: { filter: ChainsFilter }) {  const { data, loading, error } = useChains({ filter });
  if (loading) return <div>Loading…</div>;
  if (error) return <div>Error: {error.message}</div>;
  return (    <div>      {data.map((chain) => (        <div key={chain.chainId}>          <h3>{chain.name}</h3>          <p>Chain ID: {chain.chainId}</p>        </div>      ))}    </div>  );}

Where ChainsFilter is one of:

ChainsFilter.ALL - All chains
ChainsFilter.MAINNET_ONLY - Mainnets only
ChainsFilter.TESTNET_ONLY - Testnets only

Fetching a Single Chain

Get detailed information about a specific blockchain network by its chain ID.

React
TypeScript
GraphQL

Use the useChain hook to fetch a specific chain.

import { type ChainRequest, useChain } from "@aave/react";
function ChainDetails({ request }: { request: ChainRequest }) {  const { data, loading, error } = useChain(request);
  if (loading) return <div>Loading…</div>;
  if (error) return <div>Error: {error.message}</div>;
  if (!data) return <div>Chain not found</div>;
  return (    <div>      <h3>{data.name}</h3>      <p>Chain ID: {data.chainId}</p>    </div>  );}

See below for an example of how to use the useChain hook.

Exampleimport { chainId } from "@aave/react";
const { data, loading, error } = useChain({  chainId: chainId(1),});