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What Is the Maximum Percentage the Base Fee Can Change per Block?

The base fee is designed to change by a maximum of 12.5% from one block to the next. This cap prevents extreme fee volatility and ensures that users can accurately estimate the cost of a transaction several blocks in advance.

The controlled rate of change is a key feature for user predictability.

Why Is the Base Fee Burned Instead of Going to Validators?
What Is the Difference between EIP-1559 and the Legacy Gas Auction System?
How Does a Dynamic Fee Model Improve Predictability?
Why Is a Fixed Gas Limit per Block Necessary for Network Stability?