Arbitrum One

LiveEVMhttps

Arbitrum One is available on TheRPC under the unified endpoint arbitrum.therpc.io/<YOUR_KEY>. Same JSON-RPC schema as your existing integration — just swap the host.

Hero methods

The five reads that cover most of an integration. Each method costs the same in CU.

Latest block number

Address balance

Read contract state

Filter logs by topic / address

eth_getBlockByNumber

Full block by number

Try a call now

Live request through TheRPC's docs proxy. No API key needed for this demo.

1curl https://arbitrum.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_blockNumber","params":[]}'

Networks

Network	Chain ID	Explorer	Endpoint
Mainnet	0xa4b1	arbiscan.io	arbitrum.therpc.io
Sepolia	0x66eee	sepolia.arbiscan.io	arbitrum.therpc.io

wallet_addEthereumChain

1await window.ethereum.request({
2  method: 'wallet_addEthereumChain',
3  params: [{
4    chainId: '0xa4b1',
5    chainName: 'Arbitrum One',
6    rpcUrls: ['https://arbitrum.therpc.io/<YOUR_KEY>'],
7    nativeCurrency: {
8      name: 'Ether',
9      symbol: 'ETH',
10      decimals: 18,
11    },
12    blockExplorerUrls: ['https://arbiscan.io'],
13  }],
14});