How to Swap Tokens on Polygon: What I Learned Testing RizeCoin

I started swapping tokens on Polygon to test RizeCoin. What I didn’t expect was bots showing up in the middle of my trades. Here’s the honest walkthrough — including the part nobody talks about when you’re trading a low-liquidity token.

After creating RizeCoin on Polygon, the next step was testing whether it actually worked. That meant swapping — buying and selling RZC against USDC to see how the token behaved in a real liquidity pool.

I started on QuickSwap. It worked, but I eventually moved to Uniswap because the interface was cleaner and easier to read. That part was simple. What wasn’t simple was what happened during the testing process itself.

RizeCoin has low liquidity. That’s the reality of a newly created token with a small pool. When I was repeatedly buying and selling to test the setup, bots noticed. Because the pool was small, my trades were visible and predictable. MEV bots started front-running my transactions — getting in before me and pushing the price in the wrong direction.

That experience taught me more about swapping than any guide did. This walkthrough covers the actual process, with honest notes on where things get complicated.

Before you start — you need POL for gas.

Every swap on Polygon requires a small gas fee paid in POL. Not USDC. Not the token you’re swapping. POL specifically. If your MetaMask wallet doesn’t have POL, the transaction won’t go through. If you need to buy POL first, I covered the exact process in this guide using MEXC.

Contents

Step 1 — Connect MetaMask to the Polygon Network
Step 2 — Go to Uniswap and Connect Your Wallet
Step 3 — Select the Tokens You Want to Swap
Step 4 — Set Your Slippage Tolerance
Step 5 — Enter the Amount and Review the Trade
Step 6 — Confirm the Swap
QuickSwap vs Uniswap — What I Actually Use
The One Thing That Surprised Me Most

Step 1 — Connect MetaMask to the Polygon Network

Open MetaMask and make sure you’re on the Polygon network — not Ethereum, not any other chain. The network name should show “Polygon Mainnet” at the top of your MetaMask window.

If you haven’t added Polygon to MetaMask yet:

Network Name: Polygon Mainnet
RPC URL: https://polygon-rpc.com
Chain ID: 137
Symbol: POL
Block Explorer: https://polygonscan.com

Your wallet address is the same on Polygon as on Ethereum — the same 0x… format. What changes is the network you’re connected to and the tokens that are visible.

The most common beginner mistake at this stage is being on the wrong network. If you’re on Ethereum and try to swap Polygon tokens, the transaction either fails or goes to the wrong place. Always check the network before doing anything.

Step 2 — Go to Uniswap and Connect Your Wallet

Go to app.uniswap.org. In the top right corner, click “Connect” and select MetaMask. A popup will appear asking you to approve the connection — click confirm.

Once connected, make sure Uniswap is set to the Polygon network. There’s usually a network selector near the top of the page. Select Polygon. If it defaults to Ethereum, change it before proceeding.

⚠️ Always verify you’re on the right network in Uniswap.

Uniswap operates on multiple chains. If you’re trying to swap Polygon tokens but the interface is set to Ethereum, you’ll either get an error or swap the wrong assets entirely. Check the network selector every time you open the app.

Step 3 — Select the Tokens You Want to Swap

The swap interface shows two fields — the token you’re sending and the token you want to receive. Click on each field to select your tokens.

For common tokens like POL, USDC, or USDT, they’ll appear in the default list. For less common tokens like RizeCoin, you’ll need to paste the contract address directly into the search field.

How to find a token by contract address:

1. Go to PolygonScan and search for the token name
2. Find the contract address on the token’s page
3. Copy the full address (starts with 0x…)
4. Paste it into Uniswap’s token search field
5. The token should appear — verify the name and symbol before proceeding

⚠️ Verify the contract address before swapping.

Fake tokens with the same name exist. Always confirm the contract address matches the official one before swapping. One wrong character means a completely different token.

Step 4 — Set Your Slippage Tolerance

This is the step most beginners skip. It’s also the step that matters most when you’re trading low-liquidity tokens.

Slippage is the difference between the price you see and the price you actually get. On liquid tokens like ETH or USDC, slippage is tiny. On low-liquidity tokens, it can be significant.

How to set slippage in Uniswap:

Click the settings icon (⚙️) near the swap button.
Find “Slippage tolerance” and set it manually.

For major tokens (POL, USDC, USDT): 0.5% is usually fine.
For low-liquidity tokens: 1–3% may be needed for the transaction to go through.
For very small pools: Sometimes higher, but be careful — higher slippage means more exposure to price impact.

What I learned testing RizeCoin:

When I was repeatedly swapping RZC against USDC to test the liquidity pool, I set slippage too low at first and transactions kept failing. When I adjusted it higher, the trades went through — but I also became more visible to bots.

Because the RizeCoin pool was small and I was trading repeatedly, MEV bots started front-running my trades. They’d detect my pending transaction, jump in before me, buy the token to push the price up, then sell after my trade went through at a worse price. In a small pool, your movements are easy to predict.

The lesson: low-liquidity tokens attract bots when you trade them repeatedly. If you’re testing a token you created, be aware that your activity is visible on-chain and bots are watching.

Step 5 — Enter the Amount and Review the Trade

Enter the amount you want to swap in the top field. Uniswap will automatically calculate what you’ll receive based on current pool prices.

Before clicking swap, review:

Price impact: How much your trade moves the price. For large trades in small pools, this can be significant. If it shows more than 2–3%, reconsider the trade size.

Minimum received: The worst-case amount you’ll get after slippage. Make sure this is acceptable before proceeding.

Network fee: The gas cost in POL. On Polygon, this is usually under $0.01. Verify it before confirming.

Price impact is the number I watch most carefully. On major token pairs, it’s usually under 0.1%. On RizeCoin, it was noticeably higher because the pool is small. A large price impact means you’re moving the market with your own trade — you’re buying at a worse price because of your own purchase.

Step 6 — Confirm the Swap

Click “Swap.” A confirmation window will appear showing the final details. Review them one more time, then click “Confirm Swap.”

MetaMask will open a popup asking you to approve the transaction. Check the gas fee, then click “Confirm.”

On Polygon, transactions typically confirm within a few seconds. Once confirmed, you’ll see the new token balance in your MetaMask wallet.

How to verify the swap happened correctly:

Go to PolygonScan and paste your wallet address. You’ll see the transaction in your history — the token you sent and the token you received. This is your permanent on-chain record of the trade.

QuickSwap vs Uniswap — What I Actually Use

I started with QuickSwap because it’s Polygon-native and well-established. It works. But I moved to Uniswap because the interface is cleaner and easier to read, especially when checking price impact and setting slippage manually.

Both work on Polygon. The mechanics are the same. The choice comes down to personal preference. If you’re just starting, try both and see which feels more intuitive to you.

There’s no “better” option in absolute terms. Liquidity differs between pools on each DEX, so sometimes one will give you a better rate for a specific pair. For major tokens, the difference is usually minimal.

The One Thing That Surprised Me Most

Before I started swapping RizeCoin, I understood slippage and gas fees conceptually. What I didn’t fully understand was how visible my activity was on a small pool.

Every transaction I made was public on PolygonScan in real time. Bots were watching. When I traded repeatedly, they learned my pattern and started front-running me.

For beginners swapping major tokens like POL or USDC, this isn’t a concern — those pools are deep enough that individual trades don’t attract attention. But if you’re working with a newly created token with limited liquidity, know that your trades are visible and predictable.

That’s not a reason to avoid swapping. It’s just something to understand going in.