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docs: add 2026 Horizon Upgrade decoupled fee scalars #1281

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6 changes: 6 additions & 0 deletions docs/base-chain/network-information/network-fees.mdx
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Expand Up @@ -90,7 +90,13 @@ The **GasPriceOracle** predeployment at `0x4200000000000000000000000000000000000
| `blobBaseFee()` | Current EIP-4844 blob base fee |
| `baseFeeScalar()` | Scalar applied to the L1 base fee component |
| `blobBaseFeeScalar()` | Scalar applied to the blob base fee component |
### 2026 Horizon Upgrade (Decoupled Scalars)
Following the 2026 Horizon Upgrade, Base utilizes a decoupled scalar model. This ensures that L1 data costs are accurately priced regardless of whether data is posted via standard calldata or EIP-4844 blobs.

| Scalar Name | Horizon Value | Purpose |
| :--- | :--- | :--- |
| `base_fee_scalar` | 0.0011 | Applied to standard L1 data publishing. |
| `blob_base_fee_scalar` | 1.0210 | Applied to L1 Blob (EIP-4844) data. |
Use `getL1FeeUpperBound` when you need a quick estimate before the transaction is fully constructed. Use `getL1Fee` with the complete serialized transaction for an exact value before signing.

[Jovian upgrade]: https://docs.optimism.io/notices/upgrade-17