diff --git a/src/bundle.rs b/src/bundle.rs
index e6ca824..f12f206 100644
--- a/src/bundle.rs
+++ b/src/bundle.rs
@@ -1,5 +1,8 @@
-use alloy::rpc::types::mev::EthSendBundle;
 use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+
+use alloy::rpc::types::mev::{EthCallBundle, EthCallBundleResponse, EthSendBundle};
+use alloy_primitives::{Address, B256, U256};
 
 use crate::SignedOrder;
 
@@ -15,3 +18,37 @@ pub struct SignetEthBundle {
     /// TODO: Link to docs
     pub host_fills: Option<SignedOrder>,
 }
+
+/// Response for `signet_sendBundle`
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignetEthBundleResponse {
+    /// The bundle hash of the sent bundle.
+    ///
+    /// This is calculated as keccak256(tx_hashes) where tx_hashes are the concatenated transaction hashes.
+    pub bundle_hash: B256,
+}
+
+/// Bundle of transactions for `signet_callBundle`
+///
+/// TODO: Link to docs.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignetCallBundle {
+    /// The bundle of transactions to simulate. Same structure as a Flashbots [EthCallBundle] bundle.
+    /// see <https://github.com/alloy-rs/alloy/blob/main/crates/rpc-types-mev/src/eth_calls.rs#L13-L33>
+    #[serde(flatten)]
+    pub bundle: EthCallBundle,
+    /// Host fills to be applied to the bundle for simulation. The mapping corresponds
+    /// to asset => user => amount.
+    pub host_fills: BTreeMap<Address, BTreeMap<Address, U256>>,
+}
+
+/// Response for `signet_callBundle`
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "camelCase")]
+pub struct SignetCallBundleResponse {
+    /// The flattened "vanilla" response which comes from `eth_callBundle`
+    #[serde(flatten)]
+    pub response: EthCallBundleResponse,
+}
diff --git a/src/lib.rs b/src/lib.rs
index cb52f34..18fe3c4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,7 +23,9 @@ mod orders;
 pub use orders::{AggregateOrders, SignedOrder};
 
 mod bundle;
-pub use bundle::SignetEthBundle;
+pub use bundle::{
+    SignetCallBundle, SignetCallBundleResponse, SignetEthBundle, SignetEthBundleResponse,
+};
 
 mod req;
 pub use req::SignRequest;