docs: The eth_feeHistory JSON-RPC endpoint now returns baseFeePerGas with one extra element (the projected child base fee) to match Ethereum's execution-apis spec, and uses the block header base fee for each block. (sei-protocol/sei-chain#3321)

Author: seidroid[bot]

evm/reference.mdx

@@ -699,7 +699,7 @@ Every method below is also browsable interactively in the explorer above; this s
 
 **Supported.** Returns base fees, gas-used ratios, and reward percentile data over a range of blocks.
 
-**Sei-specific behavior:** Base fees and rewards reflect Sei's x/evm fee market (GetNextBaseFee), not an Ethereum EIP-1559 mempool, and Sei does not burn the base fee. Watermark-aware: pruned/historical blocks may not be available as far back as on Ethereum archive nodes.
+**Sei-specific behavior:** Base fees and rewards reflect Sei's x/evm fee market, not an Ethereum EIP-1559 mempool, and Sei does not burn the base fee. Each block's base fee is the block-header base fee (derived from `GetNextBaseFee` at the parent committed height), matching the value reported by the block header and transactions. Following the execution-apis/go-ethereum spec, `baseFeePerGas` contains one more element than `gasUsedRatio` (`len(baseFeePerGas) == len(gasUsedRatio) + 1`): the trailing element is the projected base fee for the child of the newest block in the requested range. Watermark-aware: pruned/historical blocks may not be available as far back as on Ethereum archive nodes, and heights that lack a header base fee (pruned or partial data) are skipped.
 
 **Parameters:**