WalletConnect can take an optional collection of RPC endpoints paired with their chain ID. This list includes some IDs not found on chainlist.org.

wallet-connect-rpc-chain-ids.js

// Chain IDs for Ethereum (source: https://docs.metamask.io/guide/ethereum-provider.html#chain-ids)
// Hex  Dec Network
// 0x1  1   Ethereum Main Network (Mainnet)
// 0x3  3   Ropsten Test Network
// 0x4  4   Rinkeby Test Network
// 0x5  5   Goerli Test Network
// 0x2a 42  Kovan Test Network

// Look up chainid.network to get a (somewhat) comprehensive list of chain IDs (EVM-based)

export default {
  1: [ // Ethereum mainnet
    "https://mainnet.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "http://127.0.0.1:7545" // Ganache (local)
  ],
  3: [ // Ethereum testnet
    "https://ropsten.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  4: [ // Ethereum testnet
    "https://rinkeby.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  5: [ // Ethereum testnet
    "https://goerli.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  10: [ // Optimism mainnet
    "https://optimism-mainnet.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "https://mainnet.optimism.io"
  ],
  42: [ // Ethereum testnet
    "https://kovan.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  69: [ // Optimism testnet
    "https://optimism-kovan.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "https://kovan.optimism.io"
  ],
  137: [ // Polygon mainnet
    "https://polygon-mainnet.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "https://polygon-rpc.com"
  ],
  4160: [ // Algorand mainnet and testnet (handle switch in UI)
    "https://mainnet.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  42161: [ // Arbitrum mainnet
    "https://arbitrum-mainnet.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "https://arb1.arbitrum.io/rpc"
  ],
  80001: [
    "https://polygon-mumbai.infura.io/v3/e9f6c744d37a4043b45c11e192a47378"
  ],
  421611: [ // Arbitrum testnet
    "https://arbitrum-rinkeby.infura.io/v3/e9f6c744d37a4043b45c11e192a47378",
    "https://rinkeby.arbitrum.io/rpc"
  ]
}