Deploy a contract

RHL3 is EVM compatible (Cancun hardfork), so standard tools work.

Foundry

forge create src/Counter.sol:Counter \
  --rpc-url https://rpc.rhl3.network \
  --private-key $KEY

Hardhat

networks: {
  rhl3: { url: "https://rpc.rhl3.network", chainId: 466301, accounts: [process.env.KEY] }
}

Use a fresh key and never reuse a key that holds real funds. The explorer is coming soon; until then check results with cast receipt <hash> --rpc-url https://rpc.rhl3.network.