diff --git a/Cargo.lock b/Cargo.lock
index 11aef0d76..f5930aeb0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2510,6 +2510,17 @@ dependencies = [
  "tokio-util",
 ]
 
+[[package]]
+name = "delegate"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "297806318ef30ad066b15792a8372858020ae3ca2e414ee6c2133b1eb9e9e945"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.98",
+]
+
 [[package]]
 name = "der"
 version = "0.7.9"
@@ -6638,12 +6649,14 @@ dependencies = [
 name = "reth-bench"
 version = "1.2.0"
 dependencies = [
+ "alloy-consensus",
  "alloy-eips",
  "alloy-json-rpc",
  "alloy-primitives",
  "alloy-provider",
  "alloy-pubsub",
  "alloy-rpc-client",
+ "alloy-rpc-types",
  "alloy-rpc-types-engine",
  "alloy-transport",
  "alloy-transport-http",
@@ -6652,17 +6665,21 @@ dependencies = [
  "async-trait",
  "clap",
  "csv",
+ "delegate",
  "eyre",
  "futures",
+ "op-alloy-rpc-types",
  "reqwest",
  "reth-cli-runner",
  "reth-cli-util",
+ "reth-fs-util",
  "reth-node-api",
  "reth-node-core",
  "reth-primitives",
  "reth-primitives-traits",
  "reth-tracing",
  "serde",
+ "serde_json",
  "thiserror 2.0.11",
  "tokio",
  "tower 0.4.13",
diff --git a/bin/reth-bench/Cargo.toml b/bin/reth-bench/Cargo.toml
index 097a2541a..3fc7a8952 100644
--- a/bin/reth-bench/Cargo.toml
+++ b/bin/reth-bench/Cargo.toml
@@ -16,24 +16,28 @@ workspace = true
 # reth
 reth-cli-runner.workspace = true
 reth-cli-util.workspace = true
-reth-node-core.workspace = true
+reth-fs-util.workspace = true
 reth-node-api.workspace = true
+reth-node-core.workspace = true
 reth-primitives = { workspace = true, features = ["alloy-compat"] }
 reth-primitives-traits.workspace = true
 reth-tracing.workspace = true
 
 # alloy
-alloy-provider = { workspace = true, features = ["engine-api", "reqwest-rustls-tls"], default-features = false }
-alloy-rpc-types-engine.workspace = true
-alloy-transport.workspace = true
-alloy-transport-http.workspace = true
-alloy-transport-ws.workspace = true
-alloy-transport-ipc.workspace = true
-alloy-pubsub.workspace = true
-alloy-json-rpc.workspace = true
-alloy-rpc-client.workspace = true
+alloy-consensus = { workspace = true }
 alloy-eips.workspace = true
+alloy-json-rpc.workspace = true
 alloy-primitives.workspace = true
+alloy-provider = { workspace = true, features = ["engine-api", "reqwest-rustls-tls"], default-features = false }
+alloy-pubsub.workspace = true
+alloy-rpc-client.workspace = true
+alloy-rpc-types = { workspace = true }
+alloy-rpc-types-engine = { workspace = true }
+alloy-transport-http.workspace = true
+alloy-transport-ipc.workspace = true
+alloy-transport-ws.workspace = true
+alloy-transport.workspace = true
+op-alloy-rpc-types.workspace = true
 
 # reqwest
 reqwest = { workspace = true, default-features = false, features = ["rustls-tls-native-roots"] }
@@ -44,18 +48,20 @@ tower.workspace = true
 # tracing
 tracing.workspace = true
 
-# io
+# serde
 serde.workspace = true
+serde_json.workspace = true
 
 # async
-tokio = { workspace = true, features = ["sync", "macros", "time", "rt-multi-thread"] }
-futures.workspace = true
 async-trait.workspace = true
+futures.workspace = true
+tokio = { workspace = true, features = ["sync", "macros", "time", "rt-multi-thread"] }
 
 # misc
+clap = { workspace = true, features = ["derive", "env"] }
+delegate = "0.13"
 eyre.workspace = true
 thiserror.workspace = true
-clap = { workspace = true, features = ["derive", "env"] }
 
 # for writing data
 csv = "1.3.0"
diff --git a/bin/reth-bench/src/bench/mod.rs b/bin/reth-bench/src/bench/mod.rs
index 076dbb4af..afc76b3b6 100644
--- a/bin/reth-bench/src/bench/mod.rs
+++ b/bin/reth-bench/src/bench/mod.rs
@@ -9,6 +9,7 @@ mod context;
 mod new_payload_fcu;
 mod new_payload_only;
 mod output;
+mod send_payload;
 
 /// `reth bench` command
 #[derive(Debug, Parser)]
@@ -28,6 +29,18 @@ pub enum Subcommands {
 
     /// Benchmark which only calls subsequent `newPayload` calls.
     NewPayloadOnly(new_payload_only::Command),
+
+    /// Command for generating and sending an `engine_newPayload` request constructed from an RPC
+    /// block.
+    ///
+    /// This command takes a JSON block input (either from a file or stdin) and generates
+    /// an execution payload that can be used with the `engine_newPayloadV*` API.
+    ///
+    /// One powerful use case is pairing this command with the `cast block` command, for example:
+    ///
+    /// `cast block latest--full --json | reth-bench send-payload --rpc-url localhost:5000
+    /// --jwt-secret $(cat ~/.local/share/reth/mainnet/jwt.hex)`
+    SendPayload(send_payload::Command),
 }
 
 impl BenchmarkCommand {
@@ -39,6 +52,7 @@ impl BenchmarkCommand {
         match self.command {
             Subcommands::NewPayloadFcu(command) => command.execute(ctx).await,
             Subcommands::NewPayloadOnly(command) => command.execute(ctx).await,
+            Subcommands::SendPayload(command) => command.execute(ctx).await,
         }
     }
 
diff --git a/bin/reth-bench/src/bench/send_payload.rs b/bin/reth-bench/src/bench/send_payload.rs
new file mode 100644
index 000000000..e9e8f7b54
--- /dev/null
+++ b/bin/reth-bench/src/bench/send_payload.rs
@@ -0,0 +1,238 @@
+use alloy_consensus::{
+    Block as PrimitiveBlock, BlockBody, Header as PrimitiveHeader,
+    Transaction as PrimitiveTransaction,
+};
+use alloy_eips::{eip7702::SignedAuthorization, Encodable2718, Typed2718};
+use alloy_primitives::{bytes::BufMut, Bytes, ChainId, TxKind, B256, U256};
+use alloy_rpc_types::{
+    AccessList, Block as RpcBlock, BlockTransactions, Transaction as EthRpcTransaction,
+};
+use alloy_rpc_types_engine::ExecutionPayload;
+use clap::Parser;
+use delegate::delegate;
+use eyre::{OptionExt, Result};
+use op_alloy_rpc_types::Transaction as OpRpcTransaction;
+use reth_cli_runner::CliContext;
+use serde::{Deserialize, Serialize};
+use std::io::{Read, Write};
+
+/// Command for generating and sending an `engine_newPayload` request constructed from an RPC
+/// block.
+#[derive(Debug, Parser)]
+pub struct Command {
+    /// Path to the json file to parse. If not specified, stdin will be used.
+    #[arg(short, long)]
+    path: Option<String>,
+
+    /// The engine RPC url to use.
+    #[arg(
+        short,
+        long,
+        // Required if `mode` is `execute` or `cast`.
+        required_if_eq_any([("mode", "execute"), ("mode", "cast")]),
+        // If `mode` is not specified, then `execute` is used, so we need to require it.
+        required_unless_present("mode")
+    )]
+    rpc_url: Option<String>,
+
+    /// The JWT secret to use. Can be either a path to a file containing the secret or the secret
+    /// itself.
+    #[arg(short, long)]
+    jwt_secret: Option<String>,
+
+    #[arg(long, default_value_t = 3)]
+    new_payload_version: u8,
+
+    /// The mode to use.
+    #[arg(long, value_enum, default_value = "execute")]
+    mode: Mode,
+}
+
+#[derive(Debug, Clone, clap::ValueEnum)]
+enum Mode {
+    /// Execute the `cast` command. This works with blocks of any size, because it pipes the
+    /// payload into the `cast` command.
+    Execute,
+    /// Print the `cast` command. Caution: this may not work with large blocks because of the
+    /// command length limit.
+    Cast,
+    /// Print the JSON payload. Can be piped into `cast` command if the block is small enough.
+    Json,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+enum RpcTransaction {
+    Ethereum(EthRpcTransaction),
+    Optimism(OpRpcTransaction),
+}
+
+impl Typed2718 for RpcTransaction {
+    delegate! {
+        to match self {
+            Self::Ethereum(tx) => tx,
+            Self::Optimism(tx) => tx,
+        } {
+            fn ty(&self) -> u8;
+        }
+    }
+}
+
+impl PrimitiveTransaction for RpcTransaction {
+    delegate! {
+        to match self {
+            Self::Ethereum(tx) => tx,
+            Self::Optimism(tx) => tx,
+        } {
+            fn chain_id(&self) -> Option<ChainId>;
+            fn nonce(&self) -> u64;
+            fn gas_limit(&self) -> u64;
+            fn gas_price(&self) -> Option<u128>;
+            fn max_fee_per_gas(&self) -> u128;
+            fn max_priority_fee_per_gas(&self) -> Option<u128>;
+            fn max_fee_per_blob_gas(&self) -> Option<u128>;
+            fn priority_fee_or_price(&self) -> u128;
+            fn effective_gas_price(&self, base_fee: Option<u64>) -> u128;
+            fn is_dynamic_fee(&self) -> bool;
+            fn kind(&self) -> TxKind;
+            fn is_create(&self) -> bool;
+            fn value(&self) -> U256;
+            fn input(&self) -> &Bytes;
+            fn access_list(&self) -> Option<&AccessList>;
+            fn blob_versioned_hashes(&self) -> Option<&[B256]>;
+            fn authorization_list(&self) -> Option<&[SignedAuthorization]>;
+        }
+    }
+}
+
+impl Encodable2718 for RpcTransaction {
+    delegate! {
+        to match self {
+            Self::Ethereum(tx) => tx.inner,
+            Self::Optimism(tx) => tx.inner.inner,
+        } {
+            fn encode_2718_len(&self) -> usize;
+            fn encode_2718(&self, out: &mut dyn BufMut);
+        }
+    }
+}
+
+impl Command {
+    /// Read input from either a file or stdin
+    fn read_input(&self) -> Result<String> {
+        Ok(match &self.path {
+            Some(path) => reth_fs_util::read_to_string(path)?,
+            None => String::from_utf8(std::io::stdin().bytes().collect::<Result<Vec<_>, _>>()?)?,
+        })
+    }
+
+    /// Load JWT secret from either a file or use the provided string directly
+    fn load_jwt_secret(&self) -> Result<Option<String>> {
+        match &self.jwt_secret {
+            Some(secret) => {
+                // Try to read as file first
+                match std::fs::read_to_string(secret) {
+                    Ok(contents) => Ok(Some(contents.trim().to_string())),
+                    // If file read fails, use the string directly
+                    Err(_) => Ok(Some(secret.clone())),
+                }
+            }
+            None => Ok(None),
+        }
+    }
+
+    /// Execute the generate payload command
+    pub async fn execute(self, _ctx: CliContext) -> Result<()> {
+        // Load block
+        let block_json = self.read_input()?;
+
+        // Load JWT secret
+        let jwt_secret = self.load_jwt_secret()?;
+
+        // Parse the block
+        let block: RpcBlock<RpcTransaction> = serde_json::from_str(&block_json)?;
+
+        // Extract parent beacon block root
+        let parent_beacon_block_root = block.header.parent_beacon_block_root;
+
+        // Extract transactions
+        let transactions = match block.transactions {
+            BlockTransactions::Hashes(_) => {
+                return Err(eyre::eyre!("Block must include full transaction data. Send the eth_getBlockByHash request with full: `true`"));
+            }
+            BlockTransactions::Full(txs) => txs,
+            BlockTransactions::Uncle => {
+                return Err(eyre::eyre!("Cannot process uncle blocks"));
+            }
+        };
+
+        // Extract blob versioned hashes
+        let blob_versioned_hashes = transactions
+            .iter()
+            .filter_map(|tx| tx.blob_versioned_hashes().map(|v| v.to_vec()))
+            .flatten()
+            .collect::<Vec<_>>();
+
+        // Convert to execution payload
+        let execution_payload = ExecutionPayload::from_block_slow(&PrimitiveBlock::new(
+            PrimitiveHeader::from(block.header),
+            BlockBody { transactions, ommers: vec![], withdrawals: block.withdrawals },
+        ))
+        .0;
+
+        // Create JSON request data
+        let json_request = serde_json::to_string(&(
+            execution_payload,
+            blob_versioned_hashes,
+            parent_beacon_block_root,
+        ))?;
+
+        // Print output or execute command
+        match self.mode {
+            Mode::Execute => {
+                // Create cast command
+                let mut command = std::process::Command::new("cast");
+                command.arg("rpc").arg("engine_newPayloadV3").arg("--raw");
+                if let Some(rpc_url) = self.rpc_url {
+                    command.arg("--rpc-url").arg(rpc_url);
+                }
+                if let Some(secret) = &jwt_secret {
+                    command.arg("--jwt-secret").arg(secret);
+                }
+
+                // Start cast process
+                let mut process = command.stdin(std::process::Stdio::piped()).spawn()?;
+
+                // Write to cast's stdin
+                process
+                    .stdin
+                    .take()
+                    .ok_or_eyre("stdin not available")?
+                    .write_all(json_request.as_bytes())?;
+
+                // Wait for cast to finish
+                process.wait()?;
+            }
+            Mode::Cast => {
+                let mut cmd = format!(
+                    "cast rpc engine_newPayloadV{} --raw '{}'",
+                    self.new_payload_version, json_request
+                );
+
+                if let Some(rpc_url) = self.rpc_url {
+                    cmd += &format!(" --rpc-url {}", rpc_url);
+                }
+                if let Some(secret) = &jwt_secret {
+                    cmd += &format!(" --jwt-secret {}", secret);
+                }
+
+                println!("{cmd}");
+            }
+            Mode::Json => {
+                println!("{json_request}");
+            }
+        }
+
+        Ok(())
+    }
+}