Why would I want WMON instead of MON?

WMON is the ERC-20 form of MON. You need WMON to add liquidity to a WMON-paired pool, to transfer as an ERC-20, or to call a contract that does not accept native value. If you just want gas, swap to MON instead.

Can I unwrap the resulting WMON to MON?

Yes, by calling withdraw() on the WMON contract. The ratio is fixed 1:1 with no fee, so wrap and unwrap operations are essentially free aside from gas.

What's the difference between this and MON's faucet?

The faucet drips a small amount of native MON for free. This swap converts USDT to WMON at the current pool rate. They have different output tokens (MON vs WMON) and different cost models (free with cooldown vs market rate).

How is slippage calculated?

Slippage is the difference between the quoted output and the actual output at execution time. The slippage tolerance setting tells the router to revert the transaction if the actual output drops by more than that percentage.

How to Swap USDT for WMON on Monad Testnet

4 min read · Updated 2026-04-27

Trade USDT for WMON when you want WMON for LPing, ERC-20 transfers, or contract calls that require ERC-20 input. The router skips the unwrap step at the end.

The route

Path: USDT → WMON.

Direct trade through the USDT/WMON pool. The router does not unwrap to native MON; you receive WMON as an ERC-20 balance. Useful when you want WMON specifically (for LPing or ERC-20-only contracts).

Step by step

Open PuddleSwap and connect your wallet to Monad Testnet (chain ID 10143).
Pick USDT as the input token and WMON as the output token.
Type the USDT amount you want to swap. The output WMON amount updates automatically based on the best route.
Check the slippage tolerance. The default is 1%; raise to 2-3% for thin pools, lower for deep pools.
Sign the ERC-20 approval first. This grants the router permission to pull USDT from your wallet and only needs to happen once per token.
Once the approval confirms, the Swap button activates. Click Swap and sign the transaction.
After one block, WMON appears in your wallet as an ERC-20 balance.

Slippage and fees

USDT is a stablecoin, but the USDT/WMON pair is volatile. Price impact depends on pool depth.

All UniswapV2-style pools on PuddleSwap charge a 0.30% LP fee on the input side. PuddleSwap itself does not charge an app-level fee. Gas is paid in test MON.

About USDT

USD-pegged stablecoin (testnet variant). Behaves like USDC for routing and pricing, separate brand for diversification testing. See the USDT token page for the full address, decimals, and live pools.

About WMON

ERC-20 wrapper for native MON, redeemable 1:1 at any time. Used in liquidity pools and any contract that expects ERC-20 inputs. See the WMON token page for the full address, decimals, and live pools.

Open PuddleSwap to swap USDT for WMON now, or read about star routing for the full routing model.

FAQ

Why would I want WMON instead of MON?: WMON is the ERC-20 form of MON. You need WMON to add liquidity to a WMON-paired pool, to transfer as an ERC-20, or to call a contract that does not accept native value. If you just want gas, swap to MON instead.
Can I unwrap the resulting WMON to MON?: Yes, by calling withdraw() on the WMON contract. The ratio is fixed 1:1 with no fee, so wrap and unwrap operations are essentially free aside from gas.
What's the difference between this and MON's faucet?: The faucet drips a small amount of native MON for free. This swap converts USDT to WMON at the current pool rate. They have different output tokens (MON vs WMON) and different cost models (free with cooldown vs market rate).
How is slippage calculated?: Slippage is the difference between the quoted output and the actual output at execution time. The slippage tolerance setting tells the router to revert the transaction if the actual output drops by more than that percentage.