Update README.rst

[JohannKerbrat]

Robinhood Chain

Robinhood Chain is a permissionless, Ethereum-compatible Arbitrum Layer-2.
It uses Ethereum blobs for data availability and ETH as the native gas token.
Robinhood Wallet supports it natively with no manual setup — any other
EVM-compatible wallet can add the network with the parameters below.

Network parameters

Field	Value
Network name	Robinhood Chain
Chain ID	4663 (0x1237)
RPC URL	https://rpc.mainnet.chain.robinhood.com
Currency symbol	ETH
Block explorer	https://robinhoodchain.blockscout.com
Stack	Arbitrum L2 (EVM-compatible)

Add to MetaMask

// Pops up the wallet and asks it to add Robinhood Chain.
// Fine to wire this to a "Connect" button in your dApp.
async function addRobinhoodChain() {
  if (!window.ethereum) throw new Error("No EVM wallet detected");
  await window.ethereum.request({
    method: "wallet_addEthereumChain",
    params: [
      {
        chainId: "0x1237", // same as 4663, just in hex like the wallet wants
        chainName: "Robinhood Chain",
        nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
        rpcUrls: ["https://rpc.mainnet.chain.robinhood.com"],
        blockExplorerUrls: ["https://robinhoodchain.blockscout.com"],
      },
    ],
  });
}

Verify the connection (ethers.js)

import { ethers } from "ethers";

const provider = new ethers.JsonRpcProvider(
  "https://rpc.mainnet.chain.robinhood.com"
);

// Quick check that we're actually reaching the chain
const network = await provider.getNetwork();
console.log("Chain ID:", network.chainId); // should print 4663n

const block = await provider.getBlockNumber();
console.log("Latest block:", block);

Test the network with the test address

import { ethers } from "ethers";

const RPC_URL = "https://rpc.mainnet.chain.robinhood.com";
const robin_team_test_wallet = "0x4d9302846c057507d32405ba77055473d33beb26"; // vlad wallet test

// Read-only smoke test: just reads public data to confirm the RPC is alive
// and answering sensibly. Nothing is signed and no funds ever move.
async function testRobinhoodChain() {
  const provider = new ethers.JsonRpcProvider(RPC_URL);

  // Make sure we landed on Robinhood Chain and not some other RPC by mistake
  const network = await provider.getNetwork();
  if (network.chainId !== 4663n) {
    throw new Error(`Unexpected chain ID: ${network.chainId} (expected 4663)`);
  }

  // Pull a few public numbers for the test address, all in one go
  const [balance, txCount, latestBlock] = await Promise.all([
    provider.getBalance(robin_team_test_wallet),
    provider.getTransactionCount(robin_team_test_wallet),
    provider.getBlockNumber(),
  ]);

  return {
    chainId: network.chainId.toString(),
    address: robin_team_test_wallet,
    balanceEth: ethers.formatEther(balance),
    txCount,
    latestBlock,
  };
}

testRobinhoodChain()
  .then((r) => console.log("✅ Network reachable:", r))
  .catch((e) => console.error("❌ Network test failed:", e.message));