diff --git a/app/scripts/controllers/incoming-transactions.js b/app/scripts/controllers/incoming-transactions.js
index 10f79539c439..987f0d87b826 100644
--- a/app/scripts/controllers/incoming-transactions.js
+++ b/app/scripts/controllers/incoming-transactions.js
@@ -9,11 +9,7 @@ import {
   TransactionType,
   TransactionStatus,
 } from '../../../shared/constants/transaction';
-import {
-  CHAIN_IDS,
-  CHAIN_ID_TO_NETWORK_ID_MAP,
-  CHAIN_ID_TO_TYPE_MAP,
-} from '../../../shared/constants/network';
+import { ETHERSCAN_SUPPORTED_NETWORKS } from '../../../shared/constants/network';
 import { bnToHex } from '../../../shared/modules/conversion.utils';
 
 const fetchWithTimeout = getFetchWithTimeout();
@@ -46,15 +42,9 @@ const fetchWithTimeout = getFetchWithTimeout();
  * This controller is responsible for retrieving incoming transactions. Etherscan is polled once every block to check
  * for new incoming transactions for the current selected account on the current network
  *
- * Note that only the built-in Infura networks are supported (i.e. anything in `INFURA_PROVIDER_TYPES`). We will not
- * attempt to retrieve incoming transactions on any custom RPC endpoints.
+ * Note that only Etherscan-compatible networks are supported. We will not attempt to retrieve incoming transactions
+ * on non-compatible custom RPC endpoints.
  */
-const etherscanSupportedNetworks = [
-  CHAIN_IDS.GOERLI,
-  CHAIN_IDS.MAINNET,
-  CHAIN_IDS.SEPOLIA,
-];
-
 export default class IncomingTransactionsController {
   constructor(opts = {}) {
     const {
@@ -75,13 +65,16 @@ export default class IncomingTransactionsController {
       await this._update(selectedAddress, newBlockNumberDec);
     };
 
+    const incomingTxLastFetchedBlockByChainId = Object.keys(
+      ETHERSCAN_SUPPORTED_NETWORKS,
+    ).reduce((network, chainId) => {
+      network[chainId] = null;
+      return network;
+    }, {});
+
     const initState = {
       incomingTransactions: {},
-      incomingTxLastFetchedBlockByChainId: {
-        [CHAIN_IDS.GOERLI]: null,
-        [CHAIN_IDS.MAINNET]: null,
-        [CHAIN_IDS.SEPOLIA]: null,
-      },
+      incomingTxLastFetchedBlockByChainId,
       ...opts.initState,
     };
     this.store = new ObservableStore(initState);
@@ -171,7 +164,7 @@ export default class IncomingTransactionsController {
     const { completedOnboarding } = this.onboardingController.store.getState();
     const chainId = this.getCurrentChainId();
     if (
-      !etherscanSupportedNetworks.includes(chainId) ||
+      !Object.hasOwnProperty.call(ETHERSCAN_SUPPORTED_NETWORKS, chainId) ||
       !address ||
       !completedOnboarding
     ) {
@@ -235,12 +228,10 @@ export default class IncomingTransactionsController {
    * @returns {TransactionMeta[]}
    */
   async _getNewIncomingTransactions(address, fromBlock, chainId) {
-    const etherscanSubdomain =
-      chainId === CHAIN_IDS.MAINNET
-        ? 'api'
-        : `api-${CHAIN_ID_TO_TYPE_MAP[chainId]}`;
+    const etherscanDomain = ETHERSCAN_SUPPORTED_NETWORKS[chainId].domain;
+    const etherscanSubdomain = ETHERSCAN_SUPPORTED_NETWORKS[chainId].subdomain;
 
-    const apiUrl = `https://${etherscanSubdomain}.etherscan.io`;
+    const apiUrl = `https://${etherscanSubdomain}.${etherscanDomain}`;
     let url = `${apiUrl}/api?module=account&action=txlist&address=${address}&tag=latest&page=1`;
 
     if (fromBlock) {
@@ -303,7 +294,7 @@ export default class IncomingTransactionsController {
       blockNumber: etherscanTransaction.blockNumber,
       id: createId(),
       chainId,
-      metamaskNetworkId: CHAIN_ID_TO_NETWORK_ID_MAP[chainId],
+      metamaskNetworkId: ETHERSCAN_SUPPORTED_NETWORKS[chainId].networkId,
       status,
       time,
       txParams,
diff --git a/app/scripts/controllers/incoming-transactions.test.js b/app/scripts/controllers/incoming-transactions.test.js
index 48bea442af46..bdfac55a75d4 100644
--- a/app/scripts/controllers/incoming-transactions.test.js
+++ b/app/scripts/controllers/incoming-transactions.test.js
@@ -6,7 +6,7 @@ import { cloneDeep } from 'lodash';
 
 import waitUntilCalled from '../../../test/lib/wait-until-called';
 import {
-  CHAIN_ID_TO_TYPE_MAP,
+  ETHERSCAN_SUPPORTED_NETWORKS,
   CHAIN_IDS,
   NETWORK_TYPES,
   NETWORK_IDS,
@@ -34,11 +34,12 @@ const PREPOPULATED_BLOCKS_BY_NETWORK = {
   [CHAIN_IDS.MAINNET]: 3,
   [CHAIN_IDS.SEPOLIA]: 6,
 };
-const EMPTY_BLOCKS_BY_NETWORK = {
-  [CHAIN_IDS.GOERLI]: null,
-  [CHAIN_IDS.MAINNET]: null,
-  [CHAIN_IDS.SEPOLIA]: null,
-};
+const EMPTY_BLOCKS_BY_NETWORK = Object.keys(
+  ETHERSCAN_SUPPORTED_NETWORKS,
+).reduce((network, chainId) => {
+  network[chainId] = null;
+  return network;
+}, {});
 
 function getEmptyInitState() {
   return {
@@ -150,20 +151,13 @@ const getFakeEtherscanTransaction = ({
 };
 
 function nockEtherscanApiForAllChains(mockResponse) {
-  for (const chainId of [
-    CHAIN_IDS.GOERLI,
-    CHAIN_IDS.MAINNET,
-    CHAIN_IDS.SEPOLIA,
-    'undefined',
-  ]) {
-    nock(
-      `https://api${
-        chainId === CHAIN_IDS.MAINNET ? '' : `-${CHAIN_ID_TO_TYPE_MAP[chainId]}`
-      }.etherscan.io`,
-    )
-      .get(/api.+/u)
-      .reply(200, JSON.stringify(mockResponse));
-  }
+  Object.values(ETHERSCAN_SUPPORTED_NETWORKS).forEach(
+    ({ domain, subdomain }) => {
+      nock(`https://${domain}.${subdomain}`)
+        .get(/api.+/u)
+        .reply(200, JSON.stringify(mockResponse));
+    },
+  );
 }
 
 describe('IncomingTransactionsController', function () {
diff --git a/shared/constants/network.ts b/shared/constants/network.ts
index 84314ac3dd58..3fd5e4b338cc 100644
--- a/shared/constants/network.ts
+++ b/shared/constants/network.ts
@@ -201,17 +201,24 @@ export const CHAIN_IDS = {
   GOERLI: '0x5',
   LOCALHOST: '0x539',
   BSC: '0x38',
+  BSC_TESTNET: '0x61',
   OPTIMISM: '0xa',
   OPTIMISM_TESTNET: '0x1a4',
   POLYGON: '0x89',
+  POLYGON_TESTNET: '0x13881',
   AVALANCHE: '0xa86a',
+  AVALANCHE_TESTNET: '0xa869',
   FANTOM: '0xfa',
+  FANTOM_TESTNET: '0xfa2',
   CELO: '0xa4ec',
   ARBITRUM: '0xa4b1',
   HARMONY: '0x63564c40',
   PALM: '0x2a15c308d',
   SEPOLIA: '0xaa36a7',
   AURORA: '0x4e454152',
+  MOONBEAM: '0x504',
+  MOONBEAM_TESTNET: '0x507',
+  MOONRIVER: '0x505',
 } as const;
 
 /**
@@ -542,6 +549,98 @@ export const NATIVE_CURRENCY_TOKEN_IMAGE_MAP = {
 
 export const INFURA_BLOCKED_KEY = 'countryBlocked';
 
+const defaultEtherscanDomain = 'etherscan.io';
+const defaultEtherscanSubdomainPrefix = 'api';
+/**
+ * Map of all Etherscan supported networks.
+ */
+export const ETHERSCAN_SUPPORTED_NETWORKS = {
+  [CHAIN_IDS.GOERLI]: {
+    domain: defaultEtherscanDomain,
+    subdomain: `${defaultEtherscanSubdomainPrefix}-${
+      CHAIN_ID_TO_TYPE_MAP[CHAIN_IDS.GOERLI]
+    }`,
+    networkId: CHAIN_ID_TO_NETWORK_ID_MAP[CHAIN_IDS.GOERLI],
+  },
+  [CHAIN_IDS.MAINNET]: {
+    domain: defaultEtherscanDomain,
+    subdomain: defaultEtherscanSubdomainPrefix,
+    networkId: CHAIN_ID_TO_NETWORK_ID_MAP[CHAIN_IDS.MAINNET],
+  },
+  [CHAIN_IDS.SEPOLIA]: {
+    domain: defaultEtherscanDomain,
+    subdomain: `${defaultEtherscanSubdomainPrefix}-${
+      CHAIN_ID_TO_TYPE_MAP[CHAIN_IDS.SEPOLIA]
+    }`,
+    networkId: CHAIN_ID_TO_NETWORK_ID_MAP[CHAIN_IDS.SEPOLIA],
+  },
+  [CHAIN_IDS.BSC]: {
+    domain: 'bscscan.com',
+    subdomain: defaultEtherscanSubdomainPrefix,
+    networkId: parseInt(CHAIN_IDS.BSC, 16).toString(),
+  },
+  [CHAIN_IDS.BSC_TESTNET]: {
+    domain: 'bscscan.com',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-testnet`,
+    networkId: parseInt(CHAIN_IDS.BSC_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.OPTIMISM]: {
+    domain: defaultEtherscanDomain,
+    subdomain: `${defaultEtherscanSubdomainPrefix}-optimistic`,
+    networkId: parseInt(CHAIN_IDS.OPTIMISM, 16).toString(),
+  },
+  [CHAIN_IDS.OPTIMISM_TESTNET]: {
+    domain: defaultEtherscanDomain,
+    subdomain: `${defaultEtherscanSubdomainPrefix}-goerli-optimistic`,
+    networkId: parseInt(CHAIN_IDS.OPTIMISM_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.POLYGON]: {
+    domain: 'polygonscan.com',
+    subdomain: defaultEtherscanSubdomainPrefix,
+    networkId: parseInt(CHAIN_IDS.POLYGON, 16).toString(),
+  },
+  [CHAIN_IDS.POLYGON_TESTNET]: {
+    domain: 'polygonscan.com',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-mumbai`,
+    networkId: parseInt(CHAIN_IDS.POLYGON_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.AVALANCHE]: {
+    domain: 'snowtrace.io',
+    subdomain: defaultEtherscanSubdomainPrefix,
+    networkId: parseInt(CHAIN_IDS.AVALANCHE, 16).toString(),
+  },
+  [CHAIN_IDS.AVALANCHE_TESTNET]: {
+    domain: 'snowtrace.io',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-testnet`,
+    networkId: parseInt(CHAIN_IDS.AVALANCHE_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.FANTOM]: {
+    domain: 'ftmscan.com',
+    subdomain: defaultEtherscanSubdomainPrefix,
+    networkId: parseInt(CHAIN_IDS.FANTOM, 16).toString(),
+  },
+  [CHAIN_IDS.FANTOM_TESTNET]: {
+    domain: 'ftmscan.com',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-testnet`,
+    networkId: parseInt(CHAIN_IDS.FANTOM_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.MOONBEAM]: {
+    domain: 'moonscan.io',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-moonbeam`,
+    networkId: parseInt(CHAIN_IDS.MOONBEAM, 16).toString(),
+  },
+  [CHAIN_IDS.MOONBEAM_TESTNET]: {
+    domain: 'moonscan.io',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-moonbase`,
+    networkId: parseInt(CHAIN_IDS.MOONBEAM_TESTNET, 16).toString(),
+  },
+  [CHAIN_IDS.MOONRIVER]: {
+    domain: 'moonscan.io',
+    subdomain: `${defaultEtherscanSubdomainPrefix}-moonriver`,
+    networkId: parseInt(CHAIN_IDS.MOONRIVER, 16).toString(),
+  },
+};
+
 /**
  * Hardforks are points in the chain where logic is changed significantly
  * enough where there is a fork and the new fork becomes the active chain.
@@ -591,6 +690,13 @@ export const BUYABLE_CHAINS_MAP: {
     | typeof CHAIN_IDS.PALM
     | typeof CHAIN_IDS.HARMONY
     | typeof CHAIN_IDS.OPTIMISM_TESTNET
+    | typeof CHAIN_IDS.BSC_TESTNET
+    | typeof CHAIN_IDS.POLYGON_TESTNET
+    | typeof CHAIN_IDS.AVALANCHE_TESTNET
+    | typeof CHAIN_IDS.FANTOM_TESTNET
+    | typeof CHAIN_IDS.MOONBEAM
+    | typeof CHAIN_IDS.MOONBEAM_TESTNET
+    | typeof CHAIN_IDS.MOONRIVER
   >]: BuyableChainSettings;
 } = {
   [CHAIN_IDS.MAINNET]: {