fix: fix monad testnet bugs (#11353)

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---

## PR-Codex overview
This PR adds support for the `MONAD_TESTNET` chain by introducing new
token definitions and updating existing configurations to include
related tokens.

### Detailed summary
- Added `MONAD_TESTNET` to
`packages/widgets-internal/components/CurrencyLogo/utils.ts`.
- Updated token addresses for `MONAD_TESTNET` in
`packages/multicall/src/constants/contracts.ts`.
- Changed token pairs for `MONAD_TESTNET` in
`apps/web/src/config/constants/exchange.ts`.
- Updated `USDC` token definition with a new address for `MONAD_TESTNET`
in `packages/tokens/src/constants/common.ts`.
- Added `USDT` token definition for `MONAD_TESTNET` in
`packages/tokens/src/constants/common.ts`.
- Included `usdt` and `wmon` in `monadTestnetTokens` in
`packages/tokens/src/constants/monadTestnet.ts`.

> ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your
question}`

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Author: chef-ryan

apps/web/src/config/constants/exchange.ts

@@ -85,7 +85,7 @@ export const SUGGESTED_BASES: ChainTokenList = {
   [ChainId.SEPOLIA]: [scrollSepoliaTokens.usdc, scrollSepoliaTokens.weth],
   [ChainId.ARBITRUM_SEPOLIA]: [arbSepoliaTokens.usdc, arbSepoliaTokens.weth],
   [ChainId.BASE_SEPOLIA]: [baseSepoliaTokens.usdc, baseSepoliaTokens.weth],
-  [ChainId.MONAD_TESTNET]: [monadTestnetTokens.usdc, monadTestnetTokens.busd],
+  [ChainId.MONAD_TESTNET]: [monadTestnetTokens.wmon, monadTestnetTokens.usdc, monadTestnetTokens.usdt],
 }
 
 // used to construct the list of all pairs we consider by default in the frontend

packages/multicall/src/constants/contracts.ts

@@ -21,6 +21,7 @@ export const MULTICALL_ADDRESS: { [key in ChainId]?: Address } = {
   [ChainId.BASE_TESTNET]: '0x6F7f93D929d6FBaF16c245e42846EF21aee23437',
   [ChainId.OPBNB_TESTNET]: '0x6A70ED893D85cf6D4059e1CF3e63a48e4D204D32',
   [ChainId.SCROLL_SEPOLIA]: '0x052a99849Ef2e13a5CB28275862991671D4b6fF5',
+  [ChainId.MONAD_TESTNET]: '0xF490DB8D37520bb41d45B79a1c5749A1FdA9f4Ea',
 }
 
 export const MULTICALL3_ADDRESS = '0xcA11bde05977b3631167028862bE2a173976CA11'

packages/tokens/src/constants/common.ts

@@ -367,7 +367,7 @@ export const USDC = {
   ),
   [ChainId.MONAD_TESTNET]: new ERC20Token(
     ChainId.MONAD_TESTNET,
-    '0x673cD70FA883394a1f3DEb3221937Ceb7C2618D7',
+    '0xf817257fed379853cDe0fa4F97AB987181B1E5Ea',
     18,
     'USDC',
     'USD Coin',
@@ -442,6 +442,14 @@ export const USDT = {
     'Tether USDT',
     'https://tether.to/',
   ),
+  [ChainId.MONAD_TESTNET]: new ERC20Token(
+    ChainId.MONAD_TESTNET,
+    '0x88b8E2161DEDC77EF4ab7585569D2415a1C1055D',
+    18,
+    'USDT',
+    'Tether USD',
+    'https://tether.to/',
+  ),
 }
 
 export const DAI = {

packages/tokens/src/constants/monadTestnet.ts

@@ -1,9 +1,18 @@
 import { ChainId } from '@pancakeswap/chains'
-import { WETH9 } from '@pancakeswap/sdk'
-import { BUSD, USDC } from './common'
+import { ERC20Token, WETH9 } from '@pancakeswap/sdk'
+import { BUSD, USDC, USDT } from './common'
 
 export const monadTestnetTokens = {
   weth: WETH9[ChainId.MONAD_TESTNET],
   busd: BUSD[ChainId.MONAD_TESTNET],
   usdc: USDC[ChainId.MONAD_TESTNET],
+  usdt: USDT[ChainId.MONAD_TESTNET],
+  wmon: new ERC20Token(
+    ChainId.MONAD_TESTNET,
+    '0x760AfE86e5de5fa0Ee542fc7B7B713e1c5425701',
+    18,
+    'WMON',
+    'Wrapped Monad',
+    'https://www.monad.xyz/',
+  ),
 }

packages/widgets-internal/components/CurrencyLogo/utils.ts

@@ -49,6 +49,7 @@ export const chainName: { [key: number]: string } = {
   [ChainId.LINEA]: "linea",
   [ChainId.BASE]: "base",
   [ChainId.OPBNB]: "opbnb",
+  [ChainId.MONAD_TESTNET]: "monad-testnet",
 };
 
 // TODO: move to utils or token-list