RPC method

eth_chainId on X Layer

Supported on SwiftNodes

Everything below was measured on 2026-10-13 by calling eth_chainId on X Layer through the same endpoint customers use, and is re-measured weekly.

What eth_chainId does

Returns the chain ID (EIP-155) as a hex string. Wallets and libraries check it before signing, and the signature commits to it, so a transaction signed for one chain cannot be replayed on another.

X Layer chain ID, as measured

net_version returns the same number as decimal text. Older tools read net_version; use eth_chainId, which is the value signatures commit to.

We sent X Layer a legacy transaction signed without a chain ID (pre-EIP-155). Its nodes refused it: "only replay-protected (EIP-155) transactions allowed over RPC". Sign with chain ID 196; every mainstream library does this by default.

eth_chainId	0xc4 (196)
net_version	196

Example request

curl -s https://rpc.swiftnodes.io/rpc/xlayer?key=YOUR_API_KEY \
  -X POST -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'

// Check you are on X Layer before signing
import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://rpc.swiftnodes.io/rpc/xlayer?key=YOUR_API_KEY"),
});

const id = await client.getChainId(); // 196
if (id !== 196) throw new Error(`wrong chain: ${id}`);

// Add X Layer to a browser wallet
await window.ethereum.request({
  method: "wallet_addEthereumChain",
  params: [{
    chainId: "0xc4",
    chainName: "X Layer",
    nativeCurrency: { name: "OKB", symbol: "OKB", decimals: 18 },
    rpcUrls: ["https://rpc.swiftnodes.io/rpc/xlayer?key=YOUR_API_KEY"],
  }],
});

Other methods on X Layer

eth_chainId on other chains

Frequently asked questions

Does X Layer support eth_chainId?

Yes. eth_chainId answered on the SwiftNodes X Layer endpoint when our weekly probe called it through the customer path (2026-10-13).

What is the X Layer chain ID?

196 in decimal, 0xc4 in hex, as returned by eth_chainId on 2026-10-13.

How do I add X Layer to MetaMask?

Call wallet_addEthereumChain with chainId 0xc4, the native currency OKB with 18 decimals, and your RPC URL; the example on this page has the full object.

X Layer endpoints, live block height and WebSocket status are on the X Layer RPC page.

One key covers every chain we serve, and SwiftNodes has a free tier.