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docs(fees): update EIP-1559 parameters and log the March/May 2026 changes #1961

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docs(fees): update EIP-1559 parameters and log the March/May 2026 changes #1961

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6 changes: 6 additions & 0 deletions docs/base-chain/network-information/configuration-changelog.mdx
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Expand Up @@ -11,6 +11,8 @@ This page tracks configuration changes to the Base networks, including updates t
| Date | Change | Documentation |
|------|--------|---------------|
| May 28, 2026 | Azul: Reduced per-transaction gas maximum to 16,777,216 (2^24) via EIP-7825 | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| March 25, 2026 | Increased block gas limit to 400,000,000 | [Current Limits](/specifications/transactions/throughput-and-limits#current-limits) |
| March 25, 2026 | Changed EIP-1559 Elasticity to 5 and Denominator to 100 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| February 4, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 2, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
Expand All @@ -28,7 +30,11 @@ This page tracks configuration changes to the Base networks, including updates t

| Date | Change | Documentation |
|------|--------|---------------|
| May 8, 2026 | Increased block gas limit to 1,200,000,000 | [Current Limits](/specifications/transactions/throughput-and-limits#current-limits) |
| May 8, 2026 | Increased EIP-1559 Elasticity to 15 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| April 20, 2026 | Azul: Reduced per-transaction gas maximum to 16,777,216 (2^24) via EIP-7825 | [Per-Transaction Gas Maximum](/specifications/transactions/throughput-and-limits#per-transaction-gas-maximum) |
| March 25, 2026 | Increased block gas limit to 400,000,000 | [Current Limits](/specifications/transactions/throughput-and-limits#current-limits) |
| March 25, 2026 | Changed EIP-1559 Elasticity to 5 and Denominator to 100 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 19, 2026 | Increased Minimum Base Fee to 5,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
| February 10, 2026 | Increased EIP-1559 Denominator to 125 | [EIP-1559 Fee Parameters](/specifications/transactions/network-fees#eip-1559-fee-parameters) |
| February 10, 2026 | Increased Minimum Base Fee to 2,000,000 wei | [Minimum Base Fee](/specifications/transactions/network-fees#minimum-base-fee) |
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12 changes: 6 additions & 6 deletions docs/specifications/transactions/network-fees.mdx
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Expand Up @@ -50,20 +50,20 @@ Base uses its own implementation of EIP-1559, which controls how the L2 base fee

### Elasticity Multiplier

The **Elasticity Multiplier** determines the maximum gas capacity of a block relative to the target gas usage. With an elasticity of 6, blocks can contain up to 6× the target gas, allowing the network to absorb sudden demand spikes.
The **Elasticity Multiplier** determines the maximum gas capacity of a block relative to the target gas usage. With an elasticity of 5, blocks can contain up to 5× the target gas, allowing the network to absorb sudden demand spikes.

### Base Fee Change Denominator

The **Base Fee Change Denominator** controls how quickly the base fee adjusts. A larger denominator means slower, more gradual fee changes. With a denominator of 125, the base fee changes more smoothly compared to lower values.
The **Base Fee Change Denominator** controls how quickly the base fee adjusts. A larger denominator means slower, more gradual fee changes. With a denominator of 100, the base fee changes more smoothly compared to lower values.

### Maximum Rate of Change

The maximum rate of base fee change per block is calculated as:

**Max increase per block = (Elasticity - 1) / Denominator**

With the current parameters (Elasticity = 6, Denominator = 125):
- Maximum increase per block: (6 - 1) / 125 = **4%**
With the current Base Mainnet parameters (Elasticity = 5, Denominator = 100):
- Maximum increase per block: (5 - 1) / 100 = **4%**
- Minimum time to double the base fee: 18 blocks × 2 seconds = **36 seconds**

This gradual adjustment helps prevent extreme fee volatility during traffic spikes while still allowing the network to respond to sustained demand.
Expand All @@ -72,8 +72,8 @@ This gradual adjustment helps prevent extreme fee volatility during traffic spik

| Network | Elasticity | Denominator | Max Change/Block |
|--------------|------------|-------------|------------------|
| Base Mainnet | 6 | 125 | 4% |
| Base Sepolia | 6 | 125 | 4% |
| Base Mainnet | 5 | 100 | 4% |
| Base Sepolia | 15 | 100 | 14% |

## Querying the L1 Fee

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6 changes: 3 additions & 3 deletions docs/specifications/transactions/throughput-and-limits.mdx
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Expand Up @@ -49,9 +49,9 @@ Fees affect practical throughput because they determine whether transactions can
| Parameter | Current value |
|-----------|---------------|
| Minimum base fee | 5,000,000 wei (0.005 gwei) |
| EIP-1559 elasticity | 6 |
| EIP-1559 denominator | 125 |
| Maximum L2 base fee change per block | 4% |
| EIP-1559 elasticity | 5 (Base Mainnet), 15 (Base Sepolia) |
| EIP-1559 denominator | 100 |
| Maximum L2 base fee change per block | 4% (Base Mainnet), 14% (Base Sepolia) |

See [Network Fees](/specifications/transactions/network-fees) for how Base transaction fees are structured, including the L2 execution fee and L1 security fee.

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