diff --git a/frontend/.env.example b/frontend/.env.example
index 4ec0303b..c34d8ac4 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -10,6 +10,10 @@ PORTIS_API_KEY=yourKeyHere
 
 MAINNET_RPC_URL=yourRpcUrlHere
 POLYGON_RPC_URL=yourRpcUrlHere
+OPTIMISM_RPC_URL=yourRpcUrlHere
+GNOSIS_CHAIN_RPC_URL=yourRpcUrlHere
+ARBITRUM_ONE_RPC_URL=yourRpcUrlHere
+SEPOLIA_RPC_URL=yourSepoliaRpcUrl
 WALLET_CONNECT_PROJECT_ID=yourId
 
 LOG_LEVEL=DEBUG
diff --git a/frontend/README.md b/frontend/README.md
index efafcf43..6bc7d532 100644
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -12,8 +12,13 @@ cp .env.example .env
 
 The required parameters are:
 
-`INFURA_ID` - A valid Infura App Identifier <br />
-`BLOCKNATIVE_API_KEY` - A Blocknative API key
+`BLOCKNATIVE_API_KEY` - A Blocknative API key <br />
+`MAINNET_RPC_URL` - Network RPC URLs <br />
+`POLYGON_RPC_URL` <br />
+`OPTIMISM_RPC_URL` <br />
+`GNOSIS_CHAIN_RPC_URL` <br />
+`ARBITRUM_ONE_RPC_URL` <br />
+`SEPOLIA_RPC_URL` <br />
 
 Optional parameters are:
 
diff --git a/frontend/src/components/models.ts b/frontend/src/components/models.ts
index ad0da139..8b1800a3 100644
--- a/frontend/src/components/models.ts
+++ b/frontend/src/components/models.ts
@@ -2,7 +2,15 @@ import { BigNumber } from 'src/utils/ethers';
 import { JsonRpcSigner, Web3Provider } from 'src/utils/ethers';
 import type { TokenList, TokenInfo } from '@uniswap/token-lists/dist/types';
 import { UmbraLogger } from 'components/logger';
-import { ETH_NETWORK_LOGO } from 'src/utils/constants';
+import {
+  ETH_NETWORK_LOGO,
+  MAINNET_RPC_URL,
+  POLYGON_RPC_URL,
+  OPTIMISM_RPC_URL,
+  SEPOLIA_RPC_URL,
+  ARBITRUM_ONE_RPC_URL,
+  GNOSIS_CHAIN_RPC_URL,
+} from 'src/utils/constants';
 
 export type { TokenList, TokenInfo } from '@uniswap/token-lists/dist/types';
 export { BigNumber } from 'src/utils/ethers';
@@ -50,7 +58,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: ETH_NETWORK_LOGO,
     },
-    rpcUrls: [`https://mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`],
+    rpcUrls: [MAINNET_RPC_URL],
     blockExplorerUrls: ['https://etherscan.io'],
     iconUrls: [ETH_NETWORK_LOGO],
     logoURI: ETH_NETWORK_LOGO,
@@ -65,7 +73,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: ETH_NETWORK_LOGO,
     },
-    rpcUrls: [`https://sepolia.infura.io/v3/${String(process.env.INFURA_ID)}`],
+    rpcUrls: [SEPOLIA_RPC_URL],
     blockExplorerUrls: ['https://sepolia.etherscan.io'],
     iconUrls: [ETH_NETWORK_LOGO],
     logoURI: ETH_NETWORK_LOGO,
@@ -80,7 +88,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: ETH_NETWORK_LOGO,
     },
-    rpcUrls: ['https://mainnet.optimism.io', `https://optimism-mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`],
+    rpcUrls: ['https://mainnet.optimism.io', OPTIMISM_RPC_URL],
     blockExplorerUrls: ['https://optimistic.etherscan.io'],
     iconUrls: ['/networks/optimism.svg'],
     logoURI: '/networks/optimism.svg',
@@ -95,7 +103,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: 'https://docs.gnosischain.com/img/tokens/xdai.png',
     },
-    rpcUrls: ['https://rpc.ankr.com/gnosis'],
+    rpcUrls: ['https://rpc.ankr.com/gnosis', GNOSIS_CHAIN_RPC_URL],
     blockExplorerUrls: ['https://gnosisscan.io'],
     iconUrls: ['/networks/gnosis.svg'],
     logoURI: '/networks/gnosis.svg',
@@ -110,7 +118,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: '/tokens/polygon.png',
     },
-    rpcUrls: ['https://polygon-rpc.com/', `https://polygon-mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`],
+    rpcUrls: ['https://polygon-rpc.com/', POLYGON_RPC_URL],
     blockExplorerUrls: ['https://polygonscan.com'],
     iconUrls: ['/networks/polygon.svg'],
     logoURI: '/networks/polygon.svg',
@@ -125,7 +133,7 @@ export const supportedChains: Array<Chain> = [
       decimals: 18,
       logoURI: ETH_NETWORK_LOGO,
     },
-    rpcUrls: ['https://arb1.arbitrum.io/rpc', `https://arbitrum-mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`],
+    rpcUrls: ['https://arb1.arbitrum.io/rpc', ARBITRUM_ONE_RPC_URL],
     blockExplorerUrls: ['https://arbiscan.io'],
     iconUrls: ['/networks/arbitrum.svg'],
     logoURI: '/networks/arbitrum.svg',
diff --git a/frontend/src/utils/address.ts b/frontend/src/utils/address.ts
index c6ba0597..30782241 100644
--- a/frontend/src/utils/address.ts
+++ b/frontend/src/utils/address.ts
@@ -16,7 +16,14 @@ import {
 import { getChainById, jsonFetch } from 'src/utils/utils';
 import { tc } from '../boot/i18n';
 import Resolution from '@unstoppabledomains/resolution';
-import { MAINNET_PROVIDER, POLYGON_PROVIDER, MULTICALL_ABI, MULTICALL_ADDRESS } from 'src/utils/constants';
+import {
+  MAINNET_PROVIDER,
+  POLYGON_PROVIDER,
+  MULTICALL_ABI,
+  MULTICALL_ADDRESS,
+  MAINNET_RPC_URL,
+  POLYGON_RPC_URL,
+} from 'src/utils/constants';
 import { AddressZero, defaultAbiCoder } from 'src/utils/ethers';
 import { UmbraApi } from 'src/utils/umbra-api';
 
@@ -49,7 +56,23 @@ export const lookupEnsName = async (address: string, provider: Provider | Static
 export const lookupCnsName = async (address: string) => {
   try {
     // Send request to get names
-    const resolution = Resolution.infura(String(process.env.INFURA_ID));
+
+    const resolution = new Resolution({
+      sourceConfig: {
+        uns: {
+          locations: {
+            Layer1: {
+              url: MAINNET_RPC_URL,
+              network: 'mainnet',
+            },
+            Layer2: {
+              url: POLYGON_RPC_URL,
+              network: 'polygon-mainnet',
+            },
+          },
+        },
+      },
+    });
     const domain = await resolution.reverse(address);
     return domain;
   } catch (err) {
diff --git a/frontend/src/utils/constants.ts b/frontend/src/utils/constants.ts
index 12074ca6..1be1d2ab 100644
--- a/frontend/src/utils/constants.ts
+++ b/frontend/src/utils/constants.ts
@@ -4,6 +4,10 @@ export const MAINNET_RPC_URL = String(process.env.MAINNET_RPC_URL);
 export const MAINNET_PROVIDER = new StaticJsonRpcProvider(MAINNET_RPC_URL);
 export const POLYGON_RPC_URL = String(process.env.POLYGON_RPC_URL);
 export const POLYGON_PROVIDER = new StaticJsonRpcProvider(POLYGON_RPC_URL);
+export const OPTIMISM_RPC_URL = String(process.env.OPTIMISM_RPC_URL);
+export const ARBITRUM_ONE_RPC_URL = String(process.env.ARBITRUM_ONE_RPC_URL);
+export const SEPOLIA_RPC_URL = String(process.env.SEPOLIA_RPC_URL);
+export const GNOSIS_CHAIN_RPC_URL = String(process.env.GNOSIS_CHAIN_RPC_URL);
 
 console.log(`MAINNET_RPC_URL ${MAINNET_RPC_URL}`);
 
diff --git a/frontend/src/utils/payment-links.ts b/frontend/src/utils/payment-links.ts
index 080ec904..05e463af 100644
--- a/frontend/src/utils/payment-links.ts
+++ b/frontend/src/utils/payment-links.ts
@@ -5,12 +5,13 @@ import { providerExport as provider, relayerExport as relayer, tokensExport as t
 import { notifyUser } from 'src/utils/alerts';
 import { BigNumber, StaticJsonRpcProvider } from 'src/utils/ethers';
 import { UmbraApi } from 'src/utils/umbra-api';
+import { MAINNET_RPC_URL } from 'src/utils/constants';
 
 /**
  * @notice Returns a provider, falling back to a mainnet provider if user's wallet is not connected
  */
 function getProvider() {
-  return provider || new StaticJsonRpcProvider(`https://mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`);
+  return provider || new StaticJsonRpcProvider(MAINNET_RPC_URL);
 }
 
 /**
diff --git a/umbra-js/.env.example b/umbra-js/.env.example
index 2db3b6a3..703db851 100644
--- a/umbra-js/.env.example
+++ b/umbra-js/.env.example
@@ -4,3 +4,9 @@ POLYGONSCAN_API_KEY=yourPolygonscanApiKey
 ARBISCAN_API_KEY=yourArbiscanApiKey
 GNOSISSCAN_API_KEY=yourGnosisSafeScanApiKey
 INFURA_ID=zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
+MAINNET_RPC_URL=yourMainnetRpcUrl
+OPTIMISM_RPC_URL=yourOptimismRpcUrl
+GNOSIS_CHAIN_RPC_URL=yourGnosisChainRpcUrl
+POLYGON_RPC_URL=yourPolygonRpcUrl
+ARBITRUM_ONE_RPC_URL=yourArbitrumOneRpcUrl
+SEPOLIA_RPC_URL=yourSepoliaRpcUrl
diff --git a/umbra-js/README.md b/umbra-js/README.md
index 7eacc60b..6306272a 100644
--- a/umbra-js/README.md
+++ b/umbra-js/README.md
@@ -222,9 +222,11 @@ the resulting `umbra-js/docs/index.html` file in your browser to view the docume
 
 ## Development
 
-1. Create a file in this directory called `.env` that looks like the one below.
-   ```bash
-   INFURA_ID=yourInfuraId
-   ```
+1. Copy the `.env.example` to `.env` and populate it with your own configuration parameters.
+
+```bash
+cp .env.example .env
+```
+
 2. Run `yarn` to install packages
 3. Run `yarn test` to run all tests.
diff --git a/umbra-js/src/classes/Umbra.ts b/umbra-js/src/classes/Umbra.ts
index c9806f6b..e51bd931 100644
--- a/umbra-js/src/classes/Umbra.ts
+++ b/umbra-js/src/classes/Umbra.ts
@@ -119,18 +119,18 @@ const isEth = (token: string) => {
 };
 
 /**
- * @notice Returns the Infura RPC URL for the provided chainId and Infura ID
+ * @notice Returns an RPC URL for the provided chainId
  */
-const infuraUrl = (chainId: BigNumberish, infuraId: string) => {
+const rpcUrlFromChain = (chainId: BigNumberish) => {
   chainId = BigNumber.from(chainId).toNumber();
   // For Hardhat, we just use the mainnet chain ID to avoid errors in tests, but this doesn't affect anything.
-  if (chainId === 1 || chainId === 1337) return `https://mainnet.infura.io/v3/${infuraId}`;
-  if (chainId === 10) return `https://optimism-mainnet.infura.io/v3/${infuraId}`;
-  if (chainId === 100) return 'https://rpc.ankr.com/gnosis';
-  if (chainId === 137) return `https://polygon-mainnet.infura.io/v3/${infuraId}`;
-  if (chainId === 42161) return `https://arbitrum-mainnet.infura.io/v3/${infuraId}`;
-  if (chainId === 11155111) return `https://sepolia.infura.io/v3/${infuraId}`;
-  throw new Error(`No Infura URL for chainId ${chainId}.`);
+  if (chainId === 1 || chainId === 1337) return String(process.env.MAINNET_RPC_URL);
+  if (chainId === 10) return String(process.env.OPTIMISM_RPC_URL);
+  if (chainId === 100) return String(process.env.GNOSIS_CHAIN_RPC_URL);
+  if (chainId === 137) return String(process.env.POLYGON_RPC_URL);
+  if (chainId === 42161) return String(process.env.ARBITRUM_ONE_RPC_URL);
+  if (chainId === 11155111) return String(process.env.SEPOLIA_RPC_URL);
+  throw new Error(`No RPC URL for chainId ${chainId}.`);
 };
 
 export class Umbra {
@@ -154,9 +154,7 @@ export class Umbra {
     if (this.chainConfig.batchSendAddress) {
       this.batchSendContract = new Contract(this.chainConfig.batchSendAddress, UMBRA_BATCH_SEND_ABI, provider);
     }
-    this.fallbackProvider = new StaticJsonRpcProvider(
-      infuraUrl(this.chainConfig.chainId, String(process.env.INFURA_ID))
-    );
+    this.fallbackProvider = new StaticJsonRpcProvider(rpcUrlFromChain(this.chainConfig.chainId));
   }
 
   // ==================================== CONTRACT INTERACTION =====================================
diff --git a/umbra-js/src/utils/utils.ts b/umbra-js/src/utils/utils.ts
index 16b1214c..617d0ce8 100644
--- a/umbra-js/src/utils/utils.ts
+++ b/umbra-js/src/utils/utils.ts
@@ -329,7 +329,22 @@ export function isDomain(name: string) {
  */
 
 function getResolutionInstance() {
-  return Resolution.infura(String(process.env.INFURA_ID));
+  return new Resolution({
+    sourceConfig: {
+      uns: {
+        locations: {
+          Layer1: {
+            url: String(process.env.MAINNET_RPC_URL),
+            network: 'mainnet',
+          },
+          Layer2: {
+            url: String(process.env.POLYGON_RPC_URL),
+            network: 'polygon-mainnet',
+          },
+        },
+      },
+    },
+  });
 }
 
 /**
@@ -345,8 +360,7 @@ async function resolveEns(name: string, provider: EthersProvider) {
     // and overriding with a mainnet provider otherwise. This ensures ENS resolution is always done
     // against L1, as explained here: https://twitter.com/makoto_inoue/status/1453737962110275598
     const { chainId } = await provider.getNetwork();
-    if (chainId !== 1)
-      provider = new StaticJsonRpcProvider(`https://mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`);
+    if (chainId !== 1) provider = new StaticJsonRpcProvider(String(process.env.MAINNET_RPC_URL));
     const address = await provider.resolveName(name);
     return address || null;
   } catch (e) {
@@ -536,7 +550,7 @@ export async function checkSupportedAddresses(recipientIds: string[]) {
   // If there are a lot of ENS or CNS names here this will send too many RPC requests and trigger
   // errors. The current use case of this method takes addresses, so this should not be a problem.
   // If it becomes a problem, add a batched version of toAddress.
-  const provider = new StaticJsonRpcProvider(`https://mainnet.infura.io/v3/${String(process.env.INFURA_ID)}`);
+  const provider = new StaticJsonRpcProvider(String(process.env.MAINNET_RPC_URL));
   const addresses = await Promise.all(recipientIds.map((recipientId) => toAddress(recipientId, provider)));
 
   // Initialize output, start by assuming all are supported.