diff --git a/pop-api/src/lib.rs b/pop-api/src/lib.rs
index f1ffe3f5..a1a88aee 100644
--- a/pop-api/src/lib.rs
+++ b/pop-api/src/lib.rs
@@ -9,7 +9,7 @@ use primitives::storage_keys::*;
 use scale;
 pub use sp_runtime::{BoundedVec, MultiAddress, MultiSignature};
 use v0::RuntimeCall;
-pub use v0::{balances, nfts, state};
+pub use v0::{balances, nfts, relay_chain_block_number, state};
 
 type AccountId = <Environment as ink::env::Environment>::AccountId;
 type Balance = <Environment as ink::env::Environment>::Balance;
diff --git a/pop-api/src/v0/mod.rs b/pop-api/src/v0/mod.rs
index 7b87dc25..0c20f9e6 100644
--- a/pop-api/src/v0/mod.rs
+++ b/pop-api/src/v0/mod.rs
@@ -1,7 +1,18 @@
+use crate::{
+	primitives::storage_keys::{ParachainSystemKeys, RuntimeStateKeys},
+	BlockNumber, PopApiError,
+};
+
 pub mod balances;
 pub mod nfts;
 pub mod state;
 
+pub fn relay_chain_block_number() -> Result<BlockNumber, PopApiError> {
+	Ok(state::read(RuntimeStateKeys::ParachainSystem(
+		ParachainSystemKeys::LastRelayChainBlockNumber,
+	))?)
+}
+
 #[derive(scale::Encode)]
 pub(crate) enum RuntimeCall {
 	#[codec(index = 10)]