diff --git a/Cargo.lock b/Cargo.lock
index d645996b5..306e6a992 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5418,6 +5418,19 @@ dependencies = [
  "unsigned-varint",
 ]
 
+[[package]]
+name = "op-alloy-rpc-jsonrpsee"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a98debc5266443e64e03195cd1a3b6cdbe8d8679e9d8c4b76a3670d24b2e267a"
+dependencies = [
+ "alloy-eips",
+ "alloy-primitives",
+ "jsonrpsee",
+ "op-alloy-rpc-types",
+ "op-alloy-rpc-types-engine",
+]
+
 [[package]]
 name = "op-alloy-rpc-types"
 version = "0.7.3"
@@ -8512,6 +8525,7 @@ dependencies = [
  "jsonrpsee-types",
  "op-alloy-consensus",
  "op-alloy-network",
+ "op-alloy-rpc-jsonrpsee",
  "op-alloy-rpc-types",
  "op-alloy-rpc-types-engine",
  "parking_lot",
diff --git a/Cargo.toml b/Cargo.toml
index 18b2ab655..f9fc6f2ca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -472,6 +472,7 @@ alloy-transport-ws = { version = "0.7.2", default-features = false }
 # op
 op-alloy-rpc-types = "0.7.3"
 op-alloy-rpc-types-engine = "0.7.3"
+op-alloy-rpc-jsonrpsee = "0.7.3"
 op-alloy-network = "0.7.3"
 op-alloy-consensus = "0.7.3"
 
diff --git a/crates/node/builder/src/rpc.rs b/crates/node/builder/src/rpc.rs
index 24b7db77d..edc10fecc 100644
--- a/crates/node/builder/src/rpc.rs
+++ b/crates/node/builder/src/rpc.rs
@@ -419,7 +419,7 @@ where
         ext: F,
     ) -> eyre::Result<RpcHandle<N, EthApi>>
     where
-        F: FnOnce(&mut TransportRpcModules) -> eyre::Result<()>,
+        F: FnOnce(&mut TransportRpcModules, &mut AuthRpcModule) -> eyre::Result<()>,
     {
         let Self { eth_api_builder, engine_validator_builder, hooks, _pd: _ } = self;
 
@@ -477,7 +477,7 @@ where
 
         let RpcHooks { on_rpc_started, extend_rpc_modules } = hooks;
 
-        ext(ctx.modules)?;
+        ext(ctx.modules, ctx.auth_module)?;
         extend_rpc_modules.extend_rpc_modules(ctx)?;
 
         let server_config = config.rpc.rpc_server_config();
@@ -537,7 +537,7 @@ where
     type Handle = RpcHandle<N, EthApi>;
 
     async fn launch_add_ons(self, ctx: AddOnsContext<'_, N>) -> eyre::Result<Self::Handle> {
-        self.launch_add_ons_with(ctx, |_| Ok(())).await
+        self.launch_add_ons_with(ctx, |_, _| Ok(())).await
     }
 }
 
diff --git a/crates/optimism/node/src/node.rs b/crates/optimism/node/src/node.rs
index b2203331d..c75521352 100644
--- a/crates/optimism/node/src/node.rs
+++ b/crates/optimism/node/src/node.rs
@@ -27,9 +27,10 @@ use reth_node_builder::{
 use reth_optimism_chainspec::OpChainSpec;
 use reth_optimism_consensus::OpBeaconConsensus;
 use reth_optimism_evm::{OpEvmConfig, OpExecutionStrategyFactory};
-use reth_optimism_payload_builder::builder::OpPayloadTransactions;
+use reth_optimism_payload_builder::{builder::OpPayloadTransactions, config::OpDAConfig};
 use reth_optimism_primitives::OpPrimitives;
 use reth_optimism_rpc::{
+    miner::{MinerApiExtServer, OpMinerExtApi},
     witness::{DebugExecutionWitnessApiServer, OpDebugWitnessApi},
     OpEthApi, SequencerClient,
 };
@@ -112,12 +113,25 @@ impl ChainStorage<OpPrimitives> for OpStorage {
 pub struct OpNode {
     /// Additional Optimism args
     pub args: RollupArgs,
+    /// Data availability configuration for the OP builder.
+    ///
+    /// Used to throttle the size of the data availability payloads (configured by the batcher via
+    /// the `miner_` api).
+    ///
+    /// By default no throttling is applied.
+    pub da_config: OpDAConfig,
 }
 
 impl OpNode {
     /// Creates a new instance of the Optimism node type.
-    pub const fn new(args: RollupArgs) -> Self {
-        Self { args }
+    pub fn new(args: RollupArgs) -> Self {
+        Self { args, da_config: OpDAConfig::default() }
+    }
+
+    /// Configure the data availability configuration for the OP builder.
+    pub fn with_da_config(mut self, da_config: OpDAConfig) -> Self {
+        self.da_config = da_config;
+        self
     }
 
     /// Returns the components for the given [`RollupArgs`].
@@ -182,7 +196,10 @@ where
     }
 
     fn add_ons(&self) -> Self::AddOns {
-        Self::AddOns::builder().with_sequencer(self.args.sequencer_http.clone()).build()
+        Self::AddOns::builder()
+            .with_sequencer(self.args.sequencer_http.clone())
+            .with_da_config(self.da_config.clone())
+            .build()
     }
 }
 
@@ -199,7 +216,13 @@ impl NodeTypesWithEngine for OpNode {
 
 /// Add-ons w.r.t. optimism.
 #[derive(Debug)]
-pub struct OpAddOns<N: FullNodeComponents>(pub RpcAddOns<N, OpEthApi<N>, OpEngineValidatorBuilder>);
+pub struct OpAddOns<N: FullNodeComponents> {
+    /// Rpc add-ons responsible for launching the RPC servers and instantiating the RPC handlers
+    /// and eth-api.
+    pub rpc_add_ons: RpcAddOns<N, OpEthApi<N>, OpEngineValidatorBuilder>,
+    /// Data availability configuration for the OP builder.
+    pub da_config: OpDAConfig,
+}
 
 impl<N: FullNodeComponents<Types: NodeTypes<Primitives = OpPrimitives>>> Default for OpAddOns<N> {
     fn default() -> Self {
@@ -228,14 +251,29 @@ where
         self,
         ctx: reth_node_api::AddOnsContext<'_, N>,
     ) -> eyre::Result<Self::Handle> {
+        let Self { rpc_add_ons, da_config } = self;
         // install additional OP specific rpc methods
         let debug_ext =
             OpDebugWitnessApi::new(ctx.node.provider().clone(), ctx.node.evm_config().clone());
+        let miner_ext = OpMinerExtApi::new(da_config);
 
-        self.0
-            .launch_add_ons_with(ctx, move |modules| {
+        rpc_add_ons
+            .launch_add_ons_with(ctx, move |modules, auth_modules| {
                 debug!(target: "reth::cli", "Installing debug payload witness rpc endpoint");
                 modules.merge_if_module_configured(RethRpcModule::Debug, debug_ext.into_rpc())?;
+
+                // extend the miner namespace if configured in the regular http server
+                modules.merge_if_module_configured(
+                    RethRpcModule::Miner,
+                    miner_ext.clone().into_rpc(),
+                )?;
+
+                // install the miner extension in the authenticated if configured
+                if modules.module_config().contains_any(&RethRpcModule::Miner) {
+                    debug!(target: "reth::cli", "Installing miner DA rpc enddpoint");
+                    auth_modules.merge_auth_methods(miner_ext.into_rpc())?;
+                }
+
                 Ok(())
             })
             .await
@@ -253,7 +291,7 @@ where
     type EthApi = OpEthApi<N>;
 
     fn hooks_mut(&mut self) -> &mut reth_node_builder::rpc::RpcHooks<N, Self::EthApi> {
-        self.0.hooks_mut()
+        self.rpc_add_ons.hooks_mut()
     }
 }
 
@@ -276,6 +314,8 @@ pub struct OpAddOnsBuilder {
     /// Sequencer client, configured to forward submitted transactions to sequencer of given OP
     /// network.
     sequencer_client: Option<SequencerClient>,
+    /// Data availability configuration for the OP builder.
+    da_config: Option<OpDAConfig>,
 }
 
 impl OpAddOnsBuilder {
@@ -284,6 +324,12 @@ impl OpAddOnsBuilder {
         self.sequencer_client = sequencer_client.map(SequencerClient::new);
         self
     }
+
+    /// Configure the data availability configuration for the OP builder.
+    pub fn with_da_config(mut self, da_config: OpDAConfig) -> Self {
+        self.da_config = Some(da_config);
+        self
+    }
 }
 
 impl OpAddOnsBuilder {
@@ -292,12 +338,15 @@ impl OpAddOnsBuilder {
     where
         N: FullNodeComponents<Types: NodeTypes<Primitives = OpPrimitives>>,
     {
-        let Self { sequencer_client, .. } = self;
+        let Self { sequencer_client, da_config } = self;
 
-        OpAddOns(RpcAddOns::new(
-            move |ctx| OpEthApi::<N>::builder().with_sequencer(sequencer_client).build(ctx),
-            Default::default(),
-        ))
+        OpAddOns {
+            rpc_add_ons: RpcAddOns::new(
+                move |ctx| OpEthApi::<N>::builder().with_sequencer(sequencer_client).build(ctx),
+                Default::default(),
+            ),
+            da_config: da_config.unwrap_or_default(),
+        }
     }
 }
 
diff --git a/crates/optimism/rpc/Cargo.toml b/crates/optimism/rpc/Cargo.toml
index 968beaf9e..d4a0b1fce 100644
--- a/crates/optimism/rpc/Cargo.toml
+++ b/crates/optimism/rpc/Cargo.toml
@@ -45,6 +45,7 @@ alloy-consensus.workspace = true
 op-alloy-network.workspace = true
 op-alloy-rpc-types.workspace = true
 op-alloy-rpc-types-engine.workspace = true
+op-alloy-rpc-jsonrpsee.workspace = true
 op-alloy-consensus.workspace = true
 revm.workspace = true
 
diff --git a/crates/optimism/rpc/src/lib.rs b/crates/optimism/rpc/src/lib.rs
index 0fa0debdf..b76058ce5 100644
--- a/crates/optimism/rpc/src/lib.rs
+++ b/crates/optimism/rpc/src/lib.rs
@@ -12,6 +12,7 @@
 
 pub mod error;
 pub mod eth;
+pub mod miner;
 pub mod sequencer;
 pub mod witness;
 
diff --git a/crates/optimism/rpc/src/miner.rs b/crates/optimism/rpc/src/miner.rs
new file mode 100644
index 000000000..bfdee4676
--- /dev/null
+++ b/crates/optimism/rpc/src/miner.rs
@@ -0,0 +1,32 @@
+//! Miner API extension for OP.
+
+use alloy_primitives::U64;
+use jsonrpsee_core::{async_trait, RpcResult};
+pub use op_alloy_rpc_jsonrpsee::traits::MinerApiExtServer;
+use reth_optimism_payload_builder::config::OpDAConfig;
+use tracing::debug;
+
+/// Miner API extension for OP, exposes settings for the data availability configuration via the
+/// `miner_` API.
+#[derive(Debug, Clone)]
+pub struct OpMinerExtApi {
+    da_config: OpDAConfig,
+}
+
+impl OpMinerExtApi {
+    /// Instantiate the miner API extension with the given, sharable data availability
+    /// configuration.
+    pub const fn new(da_config: OpDAConfig) -> Self {
+        Self { da_config }
+    }
+}
+
+#[async_trait]
+impl MinerApiExtServer for OpMinerExtApi {
+    /// Handler for `miner_setMaxDASize` RPC method.
+    async fn set_max_da_size(&self, max_tx_size: U64, max_block_size: U64) -> RpcResult<()> {
+        debug!(target: "rpc", "Setting max DA size: tx={}, block={}", max_tx_size, max_block_size);
+        self.da_config.set_max_da_size(max_tx_size.to(), max_block_size.to());
+        Ok(())
+    }
+}