diff --git a/apps/hyperdrive-trading/.env.sample b/apps/hyperdrive-trading/.env.sample
index 7e6ef6d13..3fa23239c 100644
--- a/apps/hyperdrive-trading/.env.sample
+++ b/apps/hyperdrive-trading/.env.sample
@@ -16,6 +16,8 @@ VITE_CAPSULE_ENV=
 #
 # Sepolia, or
 VITE_SEPOLIA_RPC_URL=
+VITE_BASE_SEPOLIA_RPC_URL=
+VITE_B3_SEPOLIA_RPC_URL=
 #
 # Mainnet
 VITE_MAINNET_RPC_URL=
diff --git a/apps/hyperdrive-trading/src/blockexplorer/makeAddressUrl.ts b/apps/hyperdrive-trading/src/blockexplorer/makeAddressUrl.ts
index eb2fdd784..62249605b 100644
--- a/apps/hyperdrive-trading/src/blockexplorer/makeAddressUrl.ts
+++ b/apps/hyperdrive-trading/src/blockexplorer/makeAddressUrl.ts
@@ -1,6 +1,7 @@
 import assertNever from "assert-never";
 import { SupportedChainId } from "src/chains/supportedChains";
-import { foundry, mainnet, sepolia } from "viem/chains";
+import { b3Sepolia } from "src/network/b3Sepolia";
+import { baseSepolia, foundry, mainnet, sepolia } from "viem/chains";
 
 export function makeAddressUrl(
   address: string,
@@ -11,6 +12,10 @@ export function makeAddressUrl(
       return `https://etherscan.io/address/${address}`;
     case sepolia.id:
       return `https://sepolia.etherscan.io/address/${address}`;
+    case baseSepolia.id:
+      return `https://sepolia.basescan.org/address/${address}`;
+    case b3Sepolia.id:
+      return `https://sepolia.explorer.b3.fun/address/${address}`;
     case foundry.id:
       return `#`;
     case 42069: // Cloudchain
diff --git a/apps/hyperdrive-trading/src/blockexplorer/makeTransactionUrl.ts b/apps/hyperdrive-trading/src/blockexplorer/makeTransactionUrl.ts
index a77deeaa4..d9321816f 100644
--- a/apps/hyperdrive-trading/src/blockexplorer/makeTransactionUrl.ts
+++ b/apps/hyperdrive-trading/src/blockexplorer/makeTransactionUrl.ts
@@ -1,6 +1,7 @@
 import assertNever from "assert-never";
 import { SupportedChainId } from "src/chains/supportedChains";
-import { foundry, mainnet, sepolia } from "viem/chains";
+import { b3Sepolia } from "src/network/b3Sepolia";
+import { baseSepolia, foundry, mainnet, sepolia } from "viem/chains";
 
 export function makeTransactionURL(
   transactionHash: string | undefined,
@@ -11,6 +12,10 @@ export function makeTransactionURL(
       return `https://etherscan.io/tx/${transactionHash}`;
     case sepolia.id:
       return `https://sepolia.etherscan.io/tx/${transactionHash}`;
+    case baseSepolia.id:
+      return `https://sepolia.basescan.org/tx/${transactionHash}`;
+    case b3Sepolia.id:
+      return `https://sepolia.explorer.b3.fun/tx/${transactionHash}`;
     case foundry.id:
       return `#`;
     case 42069: // cloud chain
diff --git a/apps/hyperdrive-trading/src/chains/supportedChains.ts b/apps/hyperdrive-trading/src/chains/supportedChains.ts
index 53a2aa834..0a7cef132 100644
--- a/apps/hyperdrive-trading/src/chains/supportedChains.ts
+++ b/apps/hyperdrive-trading/src/chains/supportedChains.ts
@@ -1,10 +1,13 @@
-import { foundry, mainnet, sepolia } from "viem/chains";
+import { b3Sepolia } from "src/network/b3Sepolia";
+import { baseSepolia, foundry, mainnet, sepolia } from "viem/chains";
 
 export const supportedChainIds = [
   42069, // cloud chain
   foundry.id,
   mainnet.id,
   sepolia.id,
+  baseSepolia.id,
+  b3Sepolia.id,
 ] as const;
 
 export type SupportedChainId = (typeof supportedChainIds)[number];
diff --git a/apps/hyperdrive-trading/src/network/b3Sepolia.ts b/apps/hyperdrive-trading/src/network/b3Sepolia.ts
new file mode 100644
index 000000000..569443891
--- /dev/null
+++ b/apps/hyperdrive-trading/src/network/b3Sepolia.ts
@@ -0,0 +1,28 @@
+import { defineChain } from "viem";
+import { chainConfig } from "viem/op-stack";
+
+const sourceId = 11155111;
+export const b3Sepolia = defineChain({
+  ...chainConfig,
+  id: 1993,
+  network: "b3-sepolia",
+  name: "B3 Sepolia",
+  nativeCurrency: { name: "Sepolia Ether", symbol: "ETH", decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ["https://b3sepolia-rpc.publicnode.com"],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: "Sepolia B3 Explorer",
+      url: "https://sepolia.explorer.b3.fun/",
+      apiUrl: "https://sepolia-explorer.b3.fun/api/v2/",
+    },
+  },
+  contracts: {
+    ...chainConfig.contracts,
+  },
+  testnet: true,
+  sourceId,
+});
diff --git a/apps/hyperdrive-trading/src/network/wagmiClient.ts b/apps/hyperdrive-trading/src/network/wagmiClient.ts
index 119ae7ed3..341dcdd3d 100644
--- a/apps/hyperdrive-trading/src/network/wagmiClient.ts
+++ b/apps/hyperdrive-trading/src/network/wagmiClient.ts
@@ -9,18 +9,20 @@ import {
 import { http } from "@wagmi/core";
 import { Chain } from "@wagmi/core/chains";
 import { cloudChain } from "src/chains/cloudChain";
+import { b3Sepolia } from "src/network/b3Sepolia";
 import { CreateWalletFn } from "src/wallets/CreateWalletFn";
 import { capsuleWallet } from "src/wallets/capsule";
 import { Transport } from "viem";
-import { foundry, mainnet, sepolia } from "wagmi/chains";
+import { baseSepolia, foundry, mainnet, sepolia } from "wagmi/chains";
 
 const {
   VITE_LOCALHOST_NODE_RPC_URL,
   VITE_CUSTOM_CHAIN_NODE_RPC_URL,
-  VITE_CUSTOM_CHAIN_ADDRESSES_URL,
   VITE_CUSTOM_CHAIN_CHAIN_ID,
   VITE_WALLET_CONNECT_PROJECT_ID,
   VITE_SEPOLIA_RPC_URL,
+  VITE_BASE_SEPOLIA_RPC_URL,
+  VITE_B3_SEPOLIA_RPC_URL,
   VITE_MAINNET_RPC_URL,
 } = import.meta.env;
 
@@ -63,6 +65,18 @@ if (VITE_SEPOLIA_RPC_URL) {
   }
 }
 
+// Base Sepolia
+if (VITE_BASE_SEPOLIA_RPC_URL) {
+  chains.push(baseSepolia);
+  transports[baseSepolia.id] = http(VITE_BASE_SEPOLIA_RPC_URL);
+}
+
+// B3 Sepolia
+if (VITE_B3_SEPOLIA_RPC_URL) {
+  chains.push(b3Sepolia);
+  transports[b3Sepolia.id] = http(VITE_B3_SEPOLIA_RPC_URL);
+}
+
 if (VITE_MAINNET_RPC_URL) {
   chains.push(mainnet);
   transports[mainnet.id] = http(VITE_MAINNET_RPC_URL);
diff --git a/apps/hyperdrive-trading/src/ui/appconfig/useAppConfig.ts b/apps/hyperdrive-trading/src/ui/appconfig/useAppConfig.ts
index c9fc48d70..03d0feacb 100644
--- a/apps/hyperdrive-trading/src/ui/appconfig/useAppConfig.ts
+++ b/apps/hyperdrive-trading/src/ui/appconfig/useAppConfig.ts
@@ -5,10 +5,31 @@ import {
   sepoliaAppConfig,
 } from "@hyperdrive/appconfig";
 import assertNever from "assert-never";
+import { ZERO_ADDRESS } from "src/base/constants";
 import { SupportedChainId } from "src/chains/supportedChains";
-import { foundry, mainnet, sepolia } from "viem/chains";
+import { b3Sepolia } from "src/network/b3Sepolia";
+import { baseSepolia, foundry, mainnet, sepolia } from "viem/chains";
 import { useChainId } from "wagmi";
 
+const emptyAppConfig: AppConfig = {
+  chainId: 0,
+  tags: [],
+  registryAddress: ZERO_ADDRESS,
+  hyperdrives: [],
+  tokens: [],
+  protocols: {},
+};
+
+const baseSepoliaAppConfig: AppConfig = {
+  ...emptyAppConfig,
+  chainId: baseSepolia.id,
+};
+
+const b3SepoliaAppConfig: AppConfig = {
+  ...emptyAppConfig,
+  chainId: b3Sepolia.id,
+};
+
 export function useAppConfig(): AppConfig {
   const chainId = useChainId() as SupportedChainId;
   switch (chainId) {
@@ -25,6 +46,12 @@ export function useAppConfig(): AppConfig {
     case sepolia.id:
       return sepoliaAppConfig;
 
+    case baseSepolia.id:
+      return baseSepoliaAppConfig;
+
+    case b3Sepolia.id:
+      return b3SepoliaAppConfig;
+
     default:
       assertNever(chainId);
   }
diff --git a/packages/hyperdrive-appconfig/src/chains/cloudChain.ts b/packages/hyperdrive-appconfig/src/chains/cloudChain.ts
index a277c8234..5ce33bbdb 100644
--- a/packages/hyperdrive-appconfig/src/chains/cloudChain.ts
+++ b/packages/hyperdrive-appconfig/src/chains/cloudChain.ts
@@ -1,15 +1,11 @@
-import { Chain } from "viem";
+import { defineChain } from "viem";
 
-export const cloudChain: Chain = {
+export const cloudChain = defineChain({
   id: +(process.env.CLOUDCHAIN_CHAIN_ID as string),
   name: "☁️ \u00A0 Chain",
-  nativeCurrency: {
-    decimals: 18,
-    name: "Ether",
-    symbol: "ETH",
-  },
+  nativeCurrency: { name: "Ether", symbol: "ETH", decimals: 18 },
   rpcUrls: {
     public: { http: [process.env.CLOUDCHAIN_NODE_RPC_URL as string] },
     default: { http: [process.env.CLOUDCHAIN_NODE_RPC_URL as string] },
   },
-};
+});
diff --git a/turbo.json b/turbo.json
index d9b2d3453..d5eaee075 100644
--- a/turbo.json
+++ b/turbo.json
@@ -2,15 +2,28 @@
   "$schema": "https://turborepo.org/schema.json",
   "tasks": {
     "build:crates": {
-      "dependsOn": ["^build"],
-      "outputs": ["packages/hyperdrive-wasm/**", "packages/fixed-point-wasm/**"]
+      "dependsOn": [
+        "^build"
+      ],
+      "outputs": [
+        "packages/hyperdrive-wasm/**",
+        "packages/fixed-point-wasm/**"
+      ]
     },
     "build": {
-      "dependsOn": ["build:crates", "^build"],
-      "outputs": ["dist/**", ".next/**"]
+      "dependsOn": [
+        "build:crates",
+        "^build"
+      ],
+      "outputs": [
+        "dist/**",
+        ".next/**"
+      ]
     },
     "hyperdrive-trading#build": {
-      "dependsOn": ["^build"],
+      "dependsOn": [
+        "^build"
+      ],
       "env": [
         "DEV",
         "VITE_CUSTOM_CHAIN_NODE_RPC_URL",
@@ -19,6 +32,8 @@
         "VITE_CUSTOM_CHAIN_ADDRESSES_URL",
         "VITE_WALLET_CONNECT_PROJECT_ID",
         "VITE_SEPOLIA_RPC_URL",
+        "VITE_BASE_SEPOLIA_RPC_URL",
+        "VITE_B3_SEPOLIA_RPC_URL",
         "VITE_MAINNET_RPC_URL",
         "VITE_CAPSULE_API_KEY",
         "VITE_CAPSULE_ENV",
@@ -26,28 +41,49 @@
         "VITE_ROLLBAR_ACCESS_TOKEN",
         "VITE_ROLLBAR_ENV"
       ],
-      "outputs": ["dist/**", ".next/**"]
+      "outputs": [
+        "dist/**",
+        ".next/**"
+      ]
     },
     "lint": {
-      "dependsOn": ["^build"],
+      "dependsOn": [
+        "^build"
+      ],
       "outputs": []
     },
     "typecheck": {
-      "dependsOn": ["^build"],
+      "dependsOn": [
+        "^build"
+      ],
       "outputs": []
     },
     "dev": {
       "cache": false
     },
-    "format": { "outputs": [] },
-    "format:check": { "outputs": [] },
+    "format": {
+      "outputs": []
+    },
+    "format:check": {
+      "outputs": []
+    },
     "test": {
-      "dependsOn": ["build"],
-      "inputs": ["test/**/*.ts", "test/**/*.tsx"]
+      "dependsOn": [
+        "build"
+      ],
+      "inputs": [
+        "test/**/*.ts",
+        "test/**/*.tsx"
+      ]
     },
     "test:run": {
-      "dependsOn": ["build"],
-      "inputs": ["test/**/*.ts", "test/**/*.tsx"]
+      "dependsOn": [
+        "build"
+      ],
+      "inputs": [
+        "test/**/*.ts",
+        "test/**/*.tsx"
+      ]
     }
   }
-}
+}
\ No newline at end of file