base · roethke · May 28, 2026 · May 27, 2026 · May 27, 2026 · May 27, 2026
diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_call.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_call.mdx
@@ -1,13 +1,13 @@
 ---
 title: 'eth_call'
 sidebarTitle: 'eth_call'
-description: 'Executes a message call without creating a transaction. Use pending on a Flashblocks endpoint to simulate against pre-confirmed state.'
+description: 'Executes a message call without creating a transaction. Use pending to simulate against pre-confirmed state.'
 ---
 
 Executes a message call immediately without broadcasting a transaction to the network. No gas is consumed on-chain. Used to read contract state or simulate calls.
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to simulate against the current pre-confirmed block state, updated every ~200ms.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to simulate against the current pre-confirmed block state, updated every ~200ms.
 </Tip>
 
 <Note>
@@ -48,7 +48,7 @@ Executes a message call immediately without broadcasting a transaction to the ne
 </ParamField>
 
 <ParamField body="block" type="string" required>
-  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` on a Flashblocks endpoint to call against pre-confirmed state.
+  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` to call against pre-confirmed state.
 </ParamField>
 
 ## Returns
@@ -85,7 +85,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending, ~200ms)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST \
   -H "Content-Type: application/json" \
   -d '{

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_estimateGas.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_estimateGas.mdx
@@ -1,13 +1,13 @@
 ---
 title: 'eth_estimateGas'
 sidebarTitle: 'eth_estimateGas'
-description: 'Estimates the gas required for a transaction. Use pending on a Flashblocks endpoint to estimate against pre-confirmed state.'
+description: 'Estimates the gas required for a transaction. Use pending to estimate against pre-confirmed state.'
 ---
 
 Returns an estimate of how much gas is required to execute a transaction. The estimate may be larger than the gas actually used at execution time.
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to estimate gas against the current pre-confirmed state, useful when a transaction depends on a prior pre-confirmed one.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to estimate gas against the current pre-confirmed state, useful when a transaction depends on a prior pre-confirmed one.
 </Tip>
 
 ## Parameters
@@ -44,7 +44,7 @@ Returns an estimate of how much gas is required to execute a transaction. The es
 </ParamField>
 
 <ParamField body="block" type="string">
-  Block to estimate against. Optional; defaults to `"latest"`. Use `"pending"` on a Flashblocks endpoint to estimate against pre-confirmed state.
+  Block to estimate against. Optional; defaults to `"latest"`. Use `"pending"` to estimate against pre-confirmed state.
 </ParamField>
 
 ## Returns
@@ -79,7 +79,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending state)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST \
   -H "Content-Type: application/json" \
   -d '{

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_feeHistory.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_feeHistory.mdx
@@ -25,8 +25,10 @@ Returns historical gas information for a range of blocks, including base fees an
 <ResponseField name="result" type="object">
   <Expandable title="Fee history fields">
     <ResponseField name="oldestBlock" type="string">The oldest block number in the result set (hex).</ResponseField>
-    <ResponseField name="baseFeePerGas" type="array">Array of base fees per gas for each block, plus one extra for the next pending block.</ResponseField>
-    <ResponseField name="gasUsedRatio" type="array">Array of gas used / gas limit ratios for each block (0.0 to 1.0).</ResponseField>
+    <ResponseField name="baseFeePerGas" type="array">Array of base fees per gas for each block, plus one extra entry for the next pending block. Length = `blockCount + 1`.</ResponseField>
+    <ResponseField name="gasUsedRatio" type="array">Array of gas used / gas limit ratios for each block (0.0 to 1.0). Length = `blockCount`.</ResponseField>
+    <ResponseField name="baseFeePerBlobGas" type="array">Array of base fees per blob gas for each block, plus one extra for the next pending block (EIP-4844). Always `"0x1"` on Base currently. Length = `blockCount + 1`.</ResponseField>
+    <ResponseField name="blobGasUsedRatio" type="array">Array of blob gas used ratios for each block (0.0 to 1.0). Used to adjust the blob base fee (EIP-4844). Length = `blockCount`.</ResponseField>
     <ResponseField name="reward" type="array">2D array of priority fee percentiles per block, matching the requested percentile values.</ResponseField>
   </Expandable>
 </ResponseField>
@@ -48,12 +50,33 @@ Returns historical gas information for a range of blocks, including base fees an
   "jsonrpc": "2.0",
   "id": 1,
   "result": {
-    "oldestBlock": "0x158a0e0",
-    "baseFeePerGas": ["0xf5", "0xf7", "0xfa", "0xfc", "0xf8", "0xf5", "0xf2", "0xf0", "0xef", "0xf1", "0xf3"],
-    "gasUsedRatio": [0.45, 0.62, 0.38, 0.71, 0.55, 0.49, 0.43, 0.37, 0.52, 0.64],
+    "baseFeePerBlobGas": [
+      "0x1",
+      "0x1",
+      "0x1",
+      "0x1",
+      "0x3"
+    ],
+    "baseFeePerGas": [
+      "0x4c4b40",
+      "0x4c4b40",
+      "0x4c4b40",
+      "0x4c4b40",
+      "0x4c4b40"
+    ],
+    "blobGasUsedRatio": [0, 0, 0, 0],
+    "gasUsedRatio": [
+      0.1180706525,
+      0.1370935325,
+      0.120803475,
+      0.0968808
+    ],
+    "oldestBlock": "0x2c31b05",
     "reward": [
-      ["0x1", "0x1", "0x2"],
-      ["0x1", "0x1", "0x1"]
+      ["0xf4240", "0x2191c0"],
+      ["0xf4240", "0x186a00"],
+      ["0x7a138", "0x4c4b40"],
+      ["0xf4240", "0x4c4b40"]
     ]
   }
 }

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_gasPrice.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_gasPrice.mdx
@@ -32,7 +32,7 @@ No parameters.
 {
   "jsonrpc": "2.0",
   "id": 1,
-  "result": "0xfa"
+  "result": "0x5b8d80"
 }
 ```
 </CodeGroup>
diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBalance.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBalance.mdx
@@ -1,13 +1,13 @@
 ---
 title: 'eth_getBalance'
 sidebarTitle: 'eth_getBalance'
-description: 'Returns the ETH balance of an account at a given block. Use the pending tag on a Flashblocks endpoint for 200ms pre-confirmed balances.'
+description: 'Returns the ETH balance of an account at a given block. Use the pending tag for 200ms pre-confirmed balances.'
 ---
 
 Returns the ETH balance of an address at a given block.
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to read balances updated every ~200ms — before the block seals.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to read balances updated every ~200ms — before the block seals.
 </Tip>
 
 ## Parameters
@@ -17,7 +17,7 @@ Returns the ETH balance of an address at a given block.
 </ParamField>
 
 <ParamField body="block" type="string" required>
-  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` on a Flashblocks endpoint for pre-confirmed balance.
+  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` for pre-confirmed balance.
 </ParamField>
 
 ## Returns
@@ -42,7 +42,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending, ~200ms)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST \
   -H "Content-Type: application/json" \
   -d '{

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByHash.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByHash.mdx
@@ -19,7 +19,7 @@ Returns information about a block by its hash.
 ## Returns
 
 <ResponseField name="result" type="object | null">
-  A block object, or `null` if no block was found. See [`eth_getBlockByNumber`](/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByNumber) for the full field list.
+  A block object, or `null` if no block was found. The response shape is identical to [`eth_getBlockByNumber`](/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByNumber) — see that page for the full field list.
 </ResponseField>
 
 ## Example
@@ -39,13 +39,35 @@ Returns information about a block by its hash.
   "jsonrpc": "2.0",
   "id": 1,
   "result": {
-    "number": "0x158a0e9",
-    "hash": "0x5c330e55a190f82ea486b61e5b12e27dfb4fb3cecfc5746886ef38ca1281bce8",
-    "parentHash": "0x9edc29b8b0a1e31d28616e40c16132ad0d58faa8bb952595b557526bdb9a960a",
-    "timestamp": "0x67bf8332",
-    "gasLimit": "0x3938700",
-    "gasUsed": "0xab3f",
-    "transactions": ["0x7ef8f8a0..."]
+    "baseFeePerGas": "0x4c4b40",
+    "blobGasUsed": "0x5384cc",
+    "difficulty": "0x0",
+    "excessBlobGas": "0x0",
+    "extraData": "0x01000000640000000500000000004c4b40",
+    "gasLimit": "0x17d78400",
+    "gasUsed": "0x2155bc7",
+    "hash": "0x491bca01d4bc076d60833dbd973fe031a74e7ae31866bf70d077619e09edb6ff",
+    "logsBloom": "0xb765d5b0...",
+    "miner": "0x4200000000000000000000000000000000000011",
+    "mixHash": "0x47aecef0e1afa26b8e1f428e9a8696cf53d85c62587d8c2cea079c715cd29626",
+    "nonce": "0x0000000000000000",
+    "number": "0x2c31b0b",
+    "parentBeaconBlockRoot": "0x15b9e7c8ac4cbe92dafc849ed30a23e91624bbe5cbe199c0ccea3f7de7fc6d49",
+    "parentHash": "0x89f4c9e23a2f706f0afa9ca8f770c4b7dcbcb73ba7e9b1c29c4a8c1b90c31d24",
+    "receiptsRoot": "0x5a428d77344334537d7adaf85a45eb6d7977bc807a68c669f36cb043600da6d2",
+    "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+    "size": "0x1bb3b",
+    "stateRoot": "0x1b1525af0cdd504147b89f2a7ce1838ccb70c5439c45ce55522c2e2529801e87",
+    "timestamp": "0x6a1092f9",
+    "transactions": [
+      "0x03c8f106f18ad94190e763e21b584c5825b2f4c61f1274c0e8abe65b4476cd51",
+      "..."
+    ],
+    "transactionsRoot": "0x6b9c9fcbdf98a8f4d38a3c16d099e9f0c7b7b474c2f5e044af7c91949c04a234",
+    "uncles": [],
+    "withdrawals": [],
+    "withdrawalsRoot": "0x57f4414a70a4af5e1a97b5fd8b8c6c870c00e8d9dbc0fde0059ce46e2cd28e5b"
   }
 }
 ```

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByNumber.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockByNumber.mdx
@@ -7,13 +7,13 @@ description: 'Returns block information by number. On Flashblocks endpoints, the
 Returns information about a block by its number.
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to fetch the live Flashblock in progress — a real block object updated every ~200ms with new pre-confirmed transactions. The response shape is identical; the block is simply not yet sealed.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to fetch the live Flashblock in progress — a real block object updated every ~200ms with new pre-confirmed transactions. The response shape is identical; the block is simply not yet sealed.
 </Tip>
 
 ## Parameters
 
 <ParamField body="block" type="string" required>
-  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` on a Flashblocks endpoint to get the in-progress block.
+  Block number in hex, or `"latest"`, `"pending"`, `"safe"`, `"finalized"`, `"earliest"`. Use `"pending"` to get the in-progress block.
 </ParamField>
 
 <ParamField body="fullTransactions" type="boolean" required>
@@ -37,7 +37,7 @@ Returns information about a block by its number.
     <ResponseField name="receiptsRoot" type="string">Root of the receipts trie.</ResponseField>
     <ResponseField name="miner" type="string">Address of the fee recipient (coinbase).</ResponseField>
     <ResponseField name="difficulty" type="string">Always `"0x0"` on Base (PoS).</ResponseField>
-    <ResponseField name="totalDifficulty" type="string">Always `"0x0"` on Base (PoS).</ResponseField>
+    <ResponseField name="mixHash" type="string">Present in all blocks; repurposed for PoS consensus (bytes32 hex).</ResponseField>
     <ResponseField name="extraData" type="string">Arbitrary data field set by the sequencer.</ResponseField>
     <ResponseField name="size" type="string">Block size in bytes (hex).</ResponseField>
     <ResponseField name="gasLimit" type="string">Maximum gas allowed in this block (hex).</ResponseField>
@@ -46,6 +46,7 @@ Returns information about a block by its number.
     <ResponseField name="transactions" type="array">Array of transaction hashes or full transaction objects.</ResponseField>
     <ResponseField name="uncles" type="array">Always `[]` on Base.</ResponseField>
     <ResponseField name="withdrawals" type="array">Always `[]` on Base.</ResponseField>
+    <ResponseField name="withdrawalsRoot" type="string">Merkle root of the withdrawals list (EIP-4895, bytes32 hex).</ResponseField>
     <ResponseField name="baseFeePerGas" type="string">EIP-1559 base fee per gas (hex).</ResponseField>
     <ResponseField name="blobGasUsed" type="string">Total blob gas used (EIP-4844, hex).</ResponseField>
     <ResponseField name="excessBlobGas" type="string">Excess blob gas for blob fee calculation (EIP-4844, hex).</ResponseField>
@@ -56,7 +57,7 @@ Returns information about a block by its number.
 
 ## Flashblock-Specific Response Fields
 
-When querying `"pending"` on a Flashblocks endpoint, the response is a live snapshot of the block being built. A few fields behave differently:
+When querying `"pending"`, the response is a live snapshot of the block being built. A few fields behave differently:
 
 | Field | Standard `latest` | Flashblocks `pending` |
 | --- | --- | --- |
@@ -82,7 +83,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending, live at ~200ms)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST \
   -H "Content-Type: application/json" \
   -d '{
@@ -98,16 +99,35 @@ curl https://mainnet-preconf.base.org \
   "jsonrpc": "2.0",
   "id": 1,
   "result": {
-    "number": "0x158a0e9",
-    "hash": "0x5c330e55a190f82ea486b61e5b12e27dfb4fb3cecfc5746886ef38ca1281bce8",
-    "parentHash": "0x9edc29b8b0a1e31d28616e40c16132ad0d58faa8bb952595b557526bdb9a960a",
-    "timestamp": "0x67bf8332",
-    "gasLimit": "0x3938700",
-    "gasUsed": "0xab3f",
-    "baseFeePerGas": "0xfa",
-    "transactions": ["0x7ef8f8a0..."],
+    "baseFeePerGas": "0x4c4b40",
+    "blobGasUsed": "0x5384cc",
+    "difficulty": "0x0",
+    "excessBlobGas": "0x0",
+    "extraData": "0x01000000640000000500000000004c4b40",
+    "gasLimit": "0x17d78400",
+    "gasUsed": "0x2155bc7",
+    "hash": "0x491bca01d4bc076d60833dbd973fe031a74e7ae31866bf70d077619e09edb6ff",
+    "logsBloom": "0xb765d5b0...",
+    "miner": "0x4200000000000000000000000000000000000011",
+    "mixHash": "0x47aecef0e1afa26b8e1f428e9a8696cf53d85c62587d8c2cea079c715cd29626",
+    "nonce": "0x0000000000000000",
+    "number": "0x2c31b0b",
+    "parentBeaconBlockRoot": "0x15b9e7c8ac4cbe92dafc849ed30a23e91624bbe5cbe199c0ccea3f7de7fc6d49",
+    "parentHash": "0x89f4c9e23a2f706f0afa9ca8f770c4b7dcbcb73ba7e9b1c29c4a8c1b90c31d24",
+    "receiptsRoot": "0x5a428d77344334537d7adaf85a45eb6d7977bc807a68c669f36cb043600da6d2",
+    "requestsHash": "0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
+    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+    "size": "0x1bb3b",
+    "stateRoot": "0x1b1525af0cdd504147b89f2a7ce1838ccb70c5439c45ce55522c2e2529801e87",
+    "timestamp": "0x6a1092f9",
+    "transactions": [
+      "0x03c8f106f18ad94190e763e21b584c5825b2f4c61f1274c0e8abe65b4476cd51",
+      "..."
+    ],
+    "transactionsRoot": "0x6b9c9fcbdf98a8f4d38a3c16d099e9f0c7b7b474c2f5e044af7c91949c04a234",
+    "uncles": [],
     "withdrawals": [],
-    "miner": "0x4200000000000000000000000000000000000011"
+    "withdrawalsRoot": "0x57f4414a70a4af5e1a97b5fd8b8c6c870c00e8d9dbc0fde0059ce46e2cd28e5b"
   }
 }
 ```

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockReceipts.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getBlockReceipts.mdx
@@ -1,13 +1,17 @@
 ---
 title: 'eth_getBlockReceipts'
 sidebarTitle: 'eth_getBlockReceipts'
-description: 'Returns all transaction receipts for a block. Use pending on a Flashblocks endpoint for pre-confirmed receipts.'
+description: 'Returns all transaction receipts for a block. Use pending for pre-confirmed receipts.'
 ---
 
 Returns all transaction receipts for a given block.
 
+<Warning>
+This method returns HTTP 403 on the public Base RPC endpoints (`mainnet.base.org`, `sepolia.base.org`). It requires a dedicated or third-party RPC provider. See the [node providers page](/base-chain/network-information/node-providers) for options.
+</Warning>
+
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to get receipts for all pre-confirmed transactions in the current Flashblock.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to get receipts for all pre-confirmed transactions in the current Flashblock.
 </Tip>
 
 ## Parameters
@@ -32,7 +36,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST -H "Content-Type: application/json" \
   -d '{"jsonrpc":"2.0","method":"eth_getBlockReceipts","params":["pending"],"id":1}'
 ```

diff --git a/...in/api-reference/ethereum-json-rpc-api/eth_getBlockTransactionCountByNumber.mdx b/...in/api-reference/ethereum-json-rpc-api/eth_getBlockTransactionCountByNumber.mdx
@@ -7,7 +7,7 @@ description: 'Returns the number of transactions in a block by block number.'
 Returns the number of transactions in a block matching the given block number.
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to get the count of pre-confirmed transactions in the current Flashblock.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to get the count of pre-confirmed transactions in the current Flashblock.
 </Tip>
 
 ## Parameters

diff --git a/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getCode.mdx b/docs/base-chain/api-reference/ethereum-json-rpc-api/eth_getCode.mdx
@@ -1,13 +1,13 @@
 ---
 title: 'eth_getCode'
 sidebarTitle: 'eth_getCode'
-description: 'Returns the contract bytecode at an address. Use pending on a Flashblocks endpoint to detect newly deployed contracts before block finalization.'
+description: 'Returns the contract bytecode at an address. Use pending to detect newly deployed contracts before block finalization.'
 ---
 
 Returns the compiled bytecode at a given address. Returns `"0x"` for externally owned accounts (EOAs).
 
 <Tip>
-**Flashblocks:** Query `https://mainnet-preconf.base.org` with `"pending"` to detect contract deployments before the block seals.
+**Flashblocks:** Query `https://mainnet.base.org` with `"pending"` to detect contract deployments before the block seals.
 </Tip>
 
 ## Parameters
@@ -42,7 +42,7 @@ curl https://mainnet.base.org \
 ```
 
 ```bash Flashblocks (pending, ~200ms)
-curl https://mainnet-preconf.base.org \
+curl https://mainnet.base.org \
   -X POST \
   -H "Content-Type: application/json" \
   -d '{