feat: add Radius Network support (mainnet + testnet)

.changeset/add-radius-network.md

@@ -0,0 +1,6 @@
+---
+'mcpay': minor
+'@mcpay/app': minor
+---
+
+Add Radius Network and Radius Testnet to the network registry and signer chain mapping. Bumps viem to ^2.48.0 to pick up the bundled Radius chain definitions.

apps/app/src/lib/client/config.ts

@@ -2,10 +2,10 @@
 
 import { metaMask, coinbaseWallet } from 'wagmi/connectors'
 import { http, createConfig, createStorage } from 'wagmi'
-import { baseSepolia, seiTestnet } from 'wagmi/chains'
- 
+import { baseSepolia, radiusTestnet, seiTestnet } from 'wagmi/chains'
+
 export const wagmiConfig = createConfig({
-  chains: [baseSepolia, seiTestnet],
+  chains: [baseSepolia, radiusTestnet, seiTestnet],
   connectors: [
     metaMask({
       dappMetadata: {
@@ -25,6 +25,7 @@ export const wagmiConfig = createConfig({
     : undefined,
   transports: {
     [baseSepolia.id]: http(),
+    [radiusTestnet.id]: http(),
     [seiTestnet.id]: http(),
   },
 })

apps/app/src/lib/client/signer.ts

@@ -1,6 +1,6 @@
 import { type Account, type Chain } from 'viem'
 import { createWalletClient, custom, publicActions } from 'viem'
-import { base, baseSepolia, avalancheFuji, sei, seiTestnet, polygon, polygonAmoy } from 'viem/chains'
+import { base, baseSepolia, avalancheFuji, sei, seiTestnet, polygon, polygonAmoy, radius, radiusTestnet } from 'viem/chains'
 
 // Create a wallet client that signs using the injected browser provider (e.g., MetaMask, Coinbase Wallet)
 // This ensures signing happens via the user's wallet, not a public RPC
@@ -24,6 +24,10 @@ function getChainFromNetwork(network: string | undefined): Chain {
       return polygon
     case 'polygon-amoy':
       return polygonAmoy
+    case 'radius':
+      return radius
+    case 'radius-testnet':
+      return radiusTestnet
     default:
       throw new Error(`Unsupported network: ${network}`)
   }

apps/app/src/lib/commons/networks.ts

@@ -36,19 +36,23 @@ export type UnifiedNetwork =
   | 'solana-mainnet'
   | 'solana-devnet'
   | 'near-mainnet'
-  | 'near-testnet';
+  | 'near-testnet'
+  | 'radius'
+  | 'radius-testnet';
 
-export type EVMNetwork = Extract<UnifiedNetwork, 
-  | 'base-sepolia' 
-  | 'base' 
+export type EVMNetwork = Extract<UnifiedNetwork,
+  | 'base-sepolia'
+  | 'base'
   | 'sei-testnet'
-  | 'avalanche-fuji' 
-  | 'avalanche' 
+  | 'avalanche-fuji'
+  | 'avalanche'
   | 'iotex'
   | 'ethereum'
   | 'ethereum-sepolia'
   | 'polygon'
-  | 'arbitrum'>;
+  | 'arbitrum'
+  | 'radius'
+  | 'radius-testnet'>;
 
 export type SolanaNetwork = Extract<UnifiedNetwork, 'solana-mainnet' | 'solana-devnet'>;
 export type NearNetwork = Extract<UnifiedNetwork, 'near-mainnet' | 'near-testnet'>;
@@ -755,6 +759,90 @@ export const UNIFIED_NETWORKS: Record<UnifiedNetwork, NetworkConfig> = {
     },
   },
 
+  // RADIUS TESTNET
+  'radius-testnet': {
+    name: 'Radius Testnet',
+    chainId: 72344,
+    architecture: 'evm',
+    isTestnet: true,
+    isSupported: true,
+    nativeCurrency: {
+      name: 'Radius USD',
+      symbol: 'RUSD',
+      decimals: 18,
+    },
+    rpcUrls: ['https://rpc.testnet.radiustech.xyz'],
+    blockExplorerUrls: ['https://testnet.radiustech.xyz'],
+    iconUrl: '/networks/radius.svg',
+    cdpSupported: false,
+    // TODO: flip to true once x402 npm ships with Radius defaults
+    // (x402-foundation/x402#2038 merged 2026-05-07; awaiting next release)
+    x402Supported: false,
+    tokens: {
+      '0x0000000000000000000000000000000000000000': {
+        symbol: 'RUSD',
+        name: 'Radius USD',
+        decimals: 18,
+        isNative: true,
+        isStablecoin: false,
+        verified: true,
+        verificationSource: 'Radius Network Official',
+      },
+      '0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb': {
+        symbol: 'SBC',
+        name: 'Stablecoin (Brale)',
+        decimals: 6,
+        address: '0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb',
+        isNative: false,
+        isStablecoin: true,
+        verified: true,
+        verificationSource: 'Brale / Radius Official',
+      },
+    },
+  },
+
+  // RADIUS MAINNET
+  'radius': {
+    name: 'Radius',
+    chainId: 723487,
+    architecture: 'evm',
+    isTestnet: false,
+    isSupported: true,
+    nativeCurrency: {
+      name: 'Radius USD',
+      symbol: 'RUSD',
+      decimals: 18,
+    },
+    rpcUrls: ['https://rpc.radiustech.xyz'],
+    blockExplorerUrls: ['https://network.radiustech.xyz'],
+    iconUrl: '/networks/radius.svg',
+    cdpSupported: false,
+    // TODO: flip to true once x402 npm ships with Radius defaults
+    // (x402-foundation/x402#2038 merged 2026-05-07; awaiting next release)
+    x402Supported: false,
+    tokens: {
+      '0x0000000000000000000000000000000000000000': {
+        symbol: 'RUSD',
+        name: 'Radius USD',
+        decimals: 18,
+        isNative: true,
+        isStablecoin: false,
+        verified: true,
+        verificationSource: 'Radius Network Official',
+      },
+      '0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb': {
+        symbol: 'SBC',
+        name: 'Stablecoin (Brale)',
+        decimals: 6,
+        address: '0x33ad9e4BD16B69B5BFdED37D8B5D9fF9aba014Fb',
+        isNative: false,
+        isStablecoin: true,
+        verified: true,
+        verificationSource: 'Brale / Radius Official',
+      },
+    },
+  },
+
   // NEAR TESTNET
   'near-testnet': {
     name: 'NEAR Testnet',

package.json

@@ -37,7 +37,7 @@
     "overrides": {
       "ai": "5.0.0-beta.20",
       "@modelcontextprotocol/sdk": "1.18.2",
-      "viem": "2.37.13"
+      "viem": "^2.48.0"
     }
   }
 }

packages/js-sdk/package.json

@@ -71,7 +71,7 @@
     "@modelcontextprotocol/sdk": "1.18.2",
     "commander": "^12.1.0",
     "dotenv": "^16.5.0",
-    "viem": "2.37.13",
+    "viem": "^2.48.0",
     "x402": "^0.6.5",
     "x402-fetch": "^0.6.0",
     "zod": "^3.25.76",

packages/js-sdk/src/utils/signer.ts

@@ -1,5 +1,5 @@
 import { Account, Chain, Client, PublicActions, RpcSchema, Transport, WalletActions } from "viem";
-import { base, baseSepolia, avalancheFuji, sei, seiTestnet, polygon, polygonAmoy } from "viem/chains";
+import { base, baseSepolia, avalancheFuji, sei, seiTestnet, polygon, polygonAmoy, radius, radiusTestnet } from "viem/chains";
 import { createWalletClient, http } from "viem";
 import { publicActions } from "viem";
 
@@ -35,6 +35,10 @@ function getChainFromNetwork(network: string | undefined): Chain {
         return polygon;
       case "polygon-amoy":
         return polygonAmoy;
+      case "radius":
+        return radius;
+      case "radius-testnet":
+        return radiusTestnet;
       default:
         throw new Error(`Unsupported network: ${network}`);
     }