diff --git a/README.md b/README.md
index 681e75b..518ab6f 100644
--- a/README.md
+++ b/README.md
@@ -388,7 +388,7 @@ Common options (run):
 - `-p, --project <path>`: Project root directory (defaults to current directory)
 - `--dotenv <path>`: Load environment variables from a custom .env file (run command only)
 - `-n, --network <selectors>`: Comma-separated selectors by chain ID or network name
-- `--rpc-url <url>`: Run against a single custom RPC; chain ID is auto-detected (no networks.yaml required)
+- `--rpc-url <url>`: Run against a single custom RPC; chain ID is auto-detected. If `networks.yaml` defines that chain, Catapult merges yaml settings (name, `supports`, `gasLimit`, `testnet`, `evmVersion`, `params`) while using your RPC URL.
 - `-k, --private-key <key>`: EOA private key (or set `PRIVATE_KEY`)
 - `--etherscan-api-key <key>`: Etherscan API key (or set `ETHERSCAN_API_KEY`)
 - `--fail-early`: Stop as soon as any job fails
diff --git a/src/commands/run.ts b/src/commands/run.ts
index de05eb0..8fed50d 100644
--- a/src/commands/run.ts
+++ b/src/commands/run.ts
@@ -2,8 +2,8 @@ import { Command } from 'commander'
 import { Deployer, DeployerOptions } from '../lib/deployer'
 import { loadNetworks } from '../lib/network-loader'
 import { detectNetworkFromRpc, isValidRpcUrl } from '../lib/network-utils'
-import { deploymentEvents } from '../lib/events'
 import { Network } from '../lib/types'
+import { deploymentEvents } from '../lib/events'
 import { projectOption, dotenvOption, noStdOption, verbosityOption, loadDotenv } from './common'
 import { resolveSelectedChainIds } from '../lib/network-selection'
 import { setVerbosity } from '../index'
@@ -76,15 +76,20 @@ export function makeRunCommand(): Command {
           // Detect network information from RPC URL
           const detectedNetwork = await detectNetworkFromRpc(options.rpcUrl)
           
-          // Create a complete network object
+          // Try to find a matching network in networks.yaml by chainId to merge verification platform support
+          const knownNetwork = networks.find(n => n.chainId === detectedNetwork.chainId)
+
+          // Create a complete network object, merging with known network config if found
           const customNetwork: Network = {
-            name: detectedNetwork.name || `custom-${detectedNetwork.chainId}`,
+            name: detectedNetwork.name || knownNetwork?.name || `custom-${detectedNetwork.chainId}`,
             chainId: detectedNetwork.chainId!,
             rpcUrl: options.rpcUrl,
             // Optional fields with defaults
-            supports: detectedNetwork.supports || [],
-            gasLimit: detectedNetwork.gasLimit,
-            testnet: detectedNetwork.testnet
+            supports: detectedNetwork.supports || knownNetwork?.supports || [],
+            gasLimit: detectedNetwork.gasLimit || knownNetwork?.gasLimit,
+            testnet: detectedNetwork.testnet !== undefined ? detectedNetwork.testnet : knownNetwork?.testnet,
+            evmVersion: detectedNetwork.evmVersion || knownNetwork?.evmVersion,
+            params: detectedNetwork.params || knownNetwork?.params,
           }
           
           // Custom network created from RPC detection
diff --git a/src/lib/__tests__/network-utils.spec.ts b/src/lib/__tests__/network-utils.spec.ts
index c0ff95b..1521688 100644
--- a/src/lib/__tests__/network-utils.spec.ts
+++ b/src/lib/__tests__/network-utils.spec.ts
@@ -108,16 +108,15 @@ describe('Network Utils', () => {
   describe('Integration with Run Command', () => {
     it('should create a complete Network object from detected information', async () => {
       const { ethers } = require('ethers')
-      
-      // Mock successful network detection
+
       const mockNetwork = {
         name: 'sepolia',
-        chainId: 11155111
+        chainId: 11155111,
       }
-      
+
       const getNetworkMock = jest.fn().mockResolvedValue(mockNetwork)
       ethers.JsonRpcProvider.mockImplementation(() => ({
-        getNetwork: getNetworkMock
+        getNetwork: getNetworkMock,
       }))
 
       const detectedInfo = await detectNetworkFromRpc('https://sepolia.infura.io/v3/abc123')
@@ -129,7 +128,9 @@ describe('Network Utils', () => {
         rpcUrl: 'https://sepolia.infura.io/v3/abc123',
         supports: detectedInfo.supports || [],
         gasLimit: detectedInfo.gasLimit,
-        testnet: detectedInfo.testnet
+        testnet: detectedInfo.testnet,
+        evmVersion: detectedInfo.evmVersion,
+        params: detectedInfo.params,
       }
 
       expect(customNetwork).toEqual({
@@ -138,22 +139,66 @@ describe('Network Utils', () => {
         rpcUrl: 'https://sepolia.infura.io/v3/abc123',
         supports: [],
         gasLimit: undefined,
-        testnet: undefined
+        testnet: undefined,
+        evmVersion: undefined,
+        params: undefined,
+      })
+    })
+
+    it('should merge params and other yaml fields when chainId matches networks.yaml', async () => {
+      const { ethers } = require('ethers')
+
+      const getNetworkMock = jest.fn().mockResolvedValue({ name: 'unknown', chainId: 137 })
+      ethers.JsonRpcProvider.mockImplementation(() => ({
+        getNetwork: getNetworkMock,
+      }))
+
+      const detectedInfo = await detectNetworkFromRpc('http://127.0.0.1:8545')
+      const knownNetwork: Network = {
+        name: 'Polygon',
+        chainId: 137,
+        rpcUrl: 'https://nodes.sequence.app/polygon/token',
+        supports: ['etherscan_v2', 'sourcify'],
+        testnet: false,
+        evmVersion: 'paris',
+        params: { trailsOnly: false },
+      }
+
+      // Simulate what the run command does
+      const customNetwork: Network = {
+        name: detectedInfo.name || knownNetwork.name || `custom-${detectedInfo.chainId}`,
+        chainId: detectedInfo.chainId!,
+        rpcUrl: 'http://127.0.0.1:8545',
+        supports: detectedInfo.supports || knownNetwork.supports || [],
+        gasLimit: detectedInfo.gasLimit || knownNetwork.gasLimit,
+        testnet: detectedInfo.testnet !== undefined ? detectedInfo.testnet : knownNetwork.testnet,
+        evmVersion: detectedInfo.evmVersion || knownNetwork.evmVersion,
+        params: detectedInfo.params || knownNetwork.params,
+      }
+
+      expect(customNetwork).toEqual({
+        name: 'unknown',
+        chainId: 137,
+        rpcUrl: 'http://127.0.0.1:8545',
+        supports: ['etherscan_v2', 'sourcify'],
+        gasLimit: undefined,
+        testnet: false,
+        evmVersion: 'paris',
+        params: { trailsOnly: false },
       })
     })
 
     it('should handle partial network information gracefully', async () => {
       const { ethers } = require('ethers')
-      
-      // Mock network with minimal information
+
       const mockNetwork = {
         name: 'unknown',
-        chainId: 42
+        chainId: 42,
       }
-      
+
       const getNetworkMock = jest.fn().mockResolvedValue(mockNetwork)
       ethers.JsonRpcProvider.mockImplementation(() => ({
-        getNetwork: getNetworkMock
+        getNetwork: getNetworkMock,
       }))
 
       const detectedInfo = await detectNetworkFromRpc('http://custom-network:8545')
@@ -165,7 +210,9 @@ describe('Network Utils', () => {
         rpcUrl: 'http://custom-network:8545',
         supports: detectedInfo.supports || [],
         gasLimit: detectedInfo.gasLimit,
-        testnet: detectedInfo.testnet
+        testnet: detectedInfo.testnet,
+        evmVersion: detectedInfo.evmVersion,
+        params: detectedInfo.params,
       }
 
       expect(customNetwork).toEqual({
@@ -174,7 +221,9 @@ describe('Network Utils', () => {
         rpcUrl: 'http://custom-network:8545',
         supports: [],
         gasLimit: undefined,
-        testnet: undefined
+        testnet: undefined,
+        evmVersion: undefined,
+        params: undefined,
       })
     })
   })