Connect to the chain

LootFi is deployed on Robinhood Chain, an Arbitrum Nitro L2 with native ETH for gas.

Mainnet only

There is no testnet deployment. Every transaction you send is real and irreversible. Test with small amounts — gas is a fraction of a cent, so a throwaway transaction is cheap.

Chain parameters

Chain ID	4663 (0x1237)
Name	Robinhood Chain
Currency	ETH, 18 decimals
RPC	https://rpc.mainnet.chain.robinhood.com
Explorer	https://robinhoodchain.blockscout.com

Add it to a wallet

await window.ethereum.request({
  method: "wallet_addEthereumChain",
  params: [{
    chainId: "0x1237",
    chainName: "Robinhood Chain",
    nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
    rpcUrls: ["https://rpc.mainnet.chain.robinhood.com"],
    blockExplorerUrls: ["https://robinhoodchain.blockscout.com"],
  }],
});

viem

import { defineChain, createPublicClient, http } from "viem";

export const robinhoodChain = defineChain({
  id: 4663,
  name: "Robinhood Chain",
  nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
  rpcUrls: { default: { http: ["https://rpc.mainnet.chain.robinhood.com"] } },
  blockExplorers: {
    default: { name: "Blockscout", url: "https://robinhoodchain.blockscout.com" },
  },
});

export const publicClient = createPublicClient({
  chain: robinhoodChain,
  transport: http(),
});

ethers v6

import { JsonRpcProvider, Network } from "ethers";

const network = Network.from({ chainId: 4663, name: "robinhood" });
const provider = new JsonRpcProvider(
  "https://rpc.mainnet.chain.robinhood.com",
  network,
  { staticNetwork: network },   // skips a chainId round-trip per call
);

Verify you are connected to the right chain

curl -s -X POST https://rpc.mainnet.chain.robinhood.com \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_chainId","params":[]}'
# → {"jsonrpc":"2.0","id":1,"result":"0x1237"}

Always assert the chain id before sending a transaction. An EIP-712 order signed against the wrong chain id will never verify, because the domain separator binds it — see Sign an order.

Explorer URL patterns

https://robinhoodchain.blockscout.com/address/<address>
https://robinhoodchain.blockscout.com/tx/<txHash>
https://robinhoodchain.blockscout.com/token/<address>/instance/<tokenId>

Gas

Nitro prices L2 execution and L1 data separately, so the total cost of a transaction depends on its calldata size as well as its computation.

Estimate per transaction; never hardcode a gas limit. A limit that works today can fail after a calldata change — for example burning 50 tokens instead of one. Use estimateGas and apply a modest buffer.