feat: add monad near intents support

packages/swapper/src/swappers/NearIntentsSwapper/swapperApi/getTradeRate.ts

@@ -1,4 +1,4 @@
-import { CHAIN_NAMESPACE, fromAssetId } from '@shapeshiftoss/caip'
+import { CHAIN_NAMESPACE, fromAssetId, monadChainId } from '@shapeshiftoss/caip'
 import { evm } from '@shapeshiftoss/chain-adapters'
 import {
   bn,
@@ -125,10 +125,32 @@ export const getTradeRate = async (
     const getFeeData = async (): Promise<string | undefined> => {
       switch (chainNamespace) {
         case CHAIN_NAMESPACE.Evm: {
-          try {
-            const contractAddress = contractAddressOrUndefined(sellAsset.assetId)
-            const data = evm.getErc20Data(depositAddress, sellAmount, contractAddress)
+          const sellAdapter = deps.assertGetEvmChainAdapter(sellAsset.chainId)
+          const contractAddress = contractAddressOrUndefined(sellAsset.assetId)
+          const data = evm.getErc20Data(depositAddress, sellAmount, contractAddress)
+
+          // For Monad, skip Tenderly and use adapter's getFeeData directly
+          if (sellAsset.chainId === monadChainId) {
+            try {
+              const feeData = await sellAdapter.getFeeData({
+                to: contractAddress ?? depositAddress,
+                value: isNativeEvmAsset(sellAsset.assetId) ? sellAmount : '0',
+                chainSpecific: {
+                  from: sendAddress || depositAddress,
+                  contractAddress,
+                  data: data || '0x',
+                },
+                sendMax: false,
+              })
+              return feeData.fast.txFee
+            } catch (error) {
+              console.error('Failed to estimate fees for Monad Near Intents:', error)
+              return '0'
+            }
+          }
 
+          // For other EVM chains, use Tenderly simulation
+          try {
             const simulationResult = await simulateWithStateOverrides(
               {
                 chainId: sellAsset.chainId,
@@ -150,11 +172,8 @@ export const getTradeRate = async (
             }
 
             // Calculate network fee using the simulated gas limit
-            const sellAdapter = deps.assertGetEvmChainAdapter(sellAsset.chainId)
             const { average } = await sellAdapter.getGasFeeData()
-
             const supportsEIP1559 = 'maxFeePerGas' in average
-
             const networkFeeCryptoBaseUnit = evm.calcNetworkFeeCryptoBaseUnit({
               ...average,
               supportsEIP1559,

packages/swapper/src/swappers/NearIntentsSwapper/types.ts

@@ -21,6 +21,7 @@ export const nearIntentsSupportedChainIds = [
   KnownChainIds.SolanaMainnet,
   KnownChainIds.TronMainnet,
   KnownChainIds.SuiMainnet,
+  KnownChainIds.MonadMainnet,
 ] as const
 
 export type NearIntentsSupportedChainId = (typeof nearIntentsSupportedChainIds)[number]
@@ -40,4 +41,5 @@ export const chainIdToNearIntentsChain: Record<NearIntentsSupportedChainId, stri
   [KnownChainIds.SolanaMainnet]: 'sol',
   [KnownChainIds.TronMainnet]: 'tron',
   [KnownChainIds.SuiMainnet]: 'sui',
+  [KnownChainIds.MonadMainnet]: 'monad',
 }

packages/swapper/src/swappers/NearIntentsSwapper/utils/helpers/helpers.ts

@@ -39,7 +39,7 @@ export const getNearIntentsAsset = ({
   return `nep141:${nearNetwork}-${contractAddress.toLowerCase()}.omft.near`
 }
 
-const NEP245_CHAINS = ['bsc', 'pol', 'avax', 'op', 'tron'] as const
+const NEP245_CHAINS = ['bsc', 'pol', 'avax', 'op', 'tron', 'monad'] as const
 const TOKEN_LOOKUP_CHAINS = ['sui'] as const
 
 export const assetToNearIntentsAsset = async (asset: Asset): Promise<string | null> => {