How to Set Gas Fees on Polygon: What Changes and Why (2026)

Every time I swapped RizeCoin, the gas fee was different. Sometimes higher, sometimes lower — I didn’t touch any settings. Here’s what’s actually happening and when it makes sense to adjust it manually.

When I was testing RizeCoin swaps on Polygon, I noticed the gas fee shown in MetaMask kept changing between transactions. Same operation, different cost. I hadn’t touched any settings. The network was choosing the fee, not me.

I left the gas settings on default throughout — I didn’t know how to change them and wasn’t confident enough to try. For most of what I was doing, that was fine. But understanding what’s happening in that fee screen made me less anxious about it and more aware of when adjusting it actually matters.

Contents

Why Gas Fees Change Every Time
The Two Gas Settings in MetaMask
When to Use Default vs. Manual Settings
How to Adjust Gas Settings in MetaMask
Gas Fees by Transaction Type on Polygon

Why Gas Fees Change Every Time

The gas price on Polygon fluctuates based on network demand. When more people are sending transactions at the same time, everyone competes for space in the next block. Fees go up. When the network is quiet, fees drop.

This is why the same swap can cost different amounts at different times. The operation itself requires the same computational work — the gas limit stays roughly the same. What changes is the price per unit of that work.

On Polygon, fees are measured in Gwei — a tiny fraction of POL. Even during busy periods, the total cost on Polygon is usually under $0.01. That’s the main reason I chose Polygon over Ethereum for RizeCoin in the first place.

What I noticed with swaps specifically:

Swaps had more gas fee variation than simple token transfers. This makes sense — a swap involves a smart contract interaction, which requires more computational work than just moving tokens between wallets. More work means higher gas, and that amount fluctuates with network conditions.

Deployments and liquidity additions happened once or a few times, so I didn’t notice the variation as much. Swaps I ran many times during testing, so the differences became obvious.

The Two Gas Settings in MetaMask

When MetaMask asks you to confirm a transaction, it shows an estimated gas fee. If you click “Edit” or “Advanced,” you can see and adjust two settings:

Gas Limit: The maximum amount of computational work you’re authorizing for this transaction. MetaMask estimates this automatically based on the type of transaction. For most users, leaving this on the default estimate is correct. Lowering it too much causes the transaction to fail — and you still pay the gas that was used before it failed.

Max Fee / Gas Price: How much you’re willing to pay per unit of gas. Higher means faster confirmation. Lower means slower — or potentially stuck if the network is busy and your bid is too low.

When to Use Default vs. Manual Settings

Use default (most of the time):
For routine transactions on Polygon — swaps, transfers, adding liquidity — the default MetaMask estimate is reliable. On Polygon, fees are so low that optimizing them manually rarely saves meaningful money.

Consider manual when:
• Your transaction is stuck pending for an unusually long time. Increasing the gas price can help it go through faster.
• You want to save on gas for a non-urgent transaction and the network is very quiet. Lowering the gas price slightly can reduce costs — but the savings on Polygon are minimal.
• You’re doing a complex contract interaction and MetaMask underestimates the gas limit. Increasing it prevents a failed transaction.

Throughout all my RizeCoin testing, I never adjusted gas settings manually. For everything I was doing on Polygon, the default was sufficient. I’m sharing how to adjust it because the option exists and occasionally matters — but for most beginners on Polygon, default settings work fine.

How to Adjust Gas Settings in MetaMask

When a transaction confirmation screen appears in MetaMask:

Step 1 — Click “Edit” next to the estimated fee
This opens the gas fee editor. You’ll see options labeled Low, Market, and Aggressive — or an Advanced option.

Step 2 — Choose a preset or go Advanced
Low: Slower but cheaper. Works when you’re not in a hurry.
Market: The current recommended fee. Usually what the default shows.
Aggressive: Faster confirmation. Slightly higher cost.

For manual control, click “Advanced” to enter specific values.

Step 3 — Adjust Max Fee or Gas Limit if needed
For a stuck transaction: increase Max Fee above the current network rate.
For a failing transaction: check if Gas Limit is being set too low and increase it slightly.

Step 4 — Confirm
Review the updated fee and confirm the transaction.

⚠️ Never lower the Gas Limit below MetaMask’s estimate.

If the transaction runs out of gas before completing, it fails. You pay for the gas used up to that point and get nothing in return. The gas limit estimate exists for a reason — don’t reduce it to save a fraction of a cent.

Gas Fees by Transaction Type on Polygon

Simple token transfer (POL or ERC-20): Lowest gas. Straightforward operation.

Swap on a DEX: Higher gas. Involves smart contract interactions. Most variable due to pool complexity and token type.

Adding or removing liquidity: Higher gas than a simple transfer. Similar to a swap.

Token contract deployment: Highest gas. A one-time cost when creating a new token.

On Polygon, even the highest of these is usually under $0.05. The variation matters more on Ethereum, where the same operations can cost $5–$50.

How to Set Gas Fees on Polygon(2026)