diff --git a/Cargo.lock b/Cargo.lock
index fd73b40..a9119fc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3102,6 +3102,7 @@ name = "pvq-test-runner"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "hex",
  "parity-scale-codec",
  "polkavm",
  "pvq-executor",
@@ -3110,6 +3111,7 @@ dependencies = [
  "pvq-extension-fungibles",
  "pvq-primitives",
  "scale-info",
+ "sp-core",
  "tracing",
  "tracing-subscriber",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 4c1f400..c20cd7b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,6 +46,7 @@ polkavm-derive = { path = "vendor/polkavm/crates/polkavm-derive", default-featur
 
 # polkadot-sdk
 sp-api = { path = "vendor/polkadot-sdk/substrate/primitives/api", default-features = false }
+sp-core = { path = "vendor/polkadot-sdk/substrate/primitives/core", default-features = false }
 frame = { package = "polkadot-sdk-frame", path = "vendor/polkadot-sdk/substrate/frame", default-features = false }
 pallet-balances = { path = "vendor/polkadot-sdk/substrate/frame/balances", default-features = false }
 pallet-assets = { path = "vendor/polkadot-sdk/substrate/frame/assets", default-features = false }
@@ -69,6 +70,7 @@ scale-info = { version = "2.11.3", default-features = false, features = [
     "derive",
 ] }
 tracing = { version = "0.1.40", default-features = false }
+hex = { version = "0.4" }
 
 # std
 clap = { version = "4.5.4", features = ["derive"] }
diff --git a/README.md b/README.md
index 2f9d162..de649dc 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,13 @@ Available PoC guest programs:
 - `guest-total-supply`: get the total supply of an asset
 - `guest-sum-balance-percent`: sum the balances of multiple accounts and calculate the percentage of the total supply
 
+### RuntimeAPI PoC
+
+1. Use chopsticks to start a local chain with the RuntimeAPI enabled: `make run`
+2. Build guest programs: `make guests`
+3. Run test runner to display hex-encoded `args` in tracing logs: `cargo run -p pvq-test-runner -- --program output/<guest-program>`
+4. Upload `program` and `args` in PJS UI.
+
 ### XCM Integration PoC
 
 The test case of XCM integration is located in `vendor/polkadot-sdk/polkadot/xcm/xcm-simulator/example/src/tests.rs`
diff --git a/poc/runtime/Cargo.toml b/poc/runtime/Cargo.toml
index c3686c9..53bf2c5 100644
--- a/poc/runtime/Cargo.toml
+++ b/poc/runtime/Cargo.toml
@@ -54,4 +54,5 @@ std = [
     "pvq-primitives/std",
     "pvq-extension-core/std",
     "pvq-extension-fungibles/std",
+    "pvq-runtime-api/std",
 ]
diff --git a/pvq-test-runner/Cargo.toml b/pvq-test-runner/Cargo.toml
index d6fd4ae..1d92a05 100644
--- a/pvq-test-runner/Cargo.toml
+++ b/pvq-test-runner/Cargo.toml
@@ -13,6 +13,7 @@ tracing = { workspace = true, features = ["std"] }
 tracing-subscriber = { workspace = true }
 parity-scale-codec = { workspace = true, features = ["std"] }
 scale-info = { workspace = true, features = ["std"] }
+sp-core = { workspace = true, features = ["std"] }
 
 pvq-executor = { workspace = true, features = ["std"] }
 pvq-extension = { workspace = true, features = ["std"] }
@@ -21,3 +22,5 @@ pvq-extension-fungibles = { workspace = true, features = ["std"] }
 pvq-primitives = { workspace = true, features = ["std"] }
 
 polkavm = { workspace = true, features = ["std"] }
+
+hex = { workspace = true, features = ["std"] }
diff --git a/pvq-test-runner/src/lib.rs b/pvq-test-runner/src/lib.rs
index f4fe1ab..c9f1777 100644
--- a/pvq-test-runner/src/lib.rs
+++ b/pvq-test-runner/src/lib.rs
@@ -1,5 +1,6 @@
 use parity_scale_codec::Encode;
 use pvq_extension::{extensions_impl, ExtensionsExecutor, InvokeSource};
+use sp_core::crypto::{AccountId32, Ss58Codec};
 
 #[derive(Encode)]
 #[allow(non_camel_case_types)]
@@ -53,21 +54,28 @@ impl TestRunner {
         let mut input_data = Vec::new();
 
         if program_path.contains("sum-balance") {
-            input_data.extend_from_slice(&0u32.encode());
-            input_data.extend_from_slice(&vec![[0u8; 32], [1u8; 32]].encode());
+            input_data.extend_from_slice(&21u32.encode());
+
+            let alice_account: [u8; 32] =
+                AccountId32::from_ss58check("5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY")
+                    .expect("Failed to decode Alice's address")
+                    .into();
+            input_data.extend_from_slice(&vec![alice_account].encode());
         } else if program_path.contains("total-supply") {
-            input_data.extend_from_slice(&0u32.encode());
+            input_data.extend_from_slice(&21u32.encode());
         } else if program_path.contains("transparent-call") {
             input_data.extend_from_slice(&4071833530116166512u64.encode());
+            let alice_account = AccountId32::from_ss58check("5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY")
+                .expect("Failed to decode Alice's address");
             input_data.extend_from_slice(
                 &ExtensionFungiblesFunctions::balance {
-                    asset: 0,
-                    who: [1u8; 32],
+                    asset: 21u32,
+                    who: alice_account.into(),
                 }
                 .encode(),
             );
         }
-
+        tracing::info!("Input data (hex): {}", hex::encode(&input_data));
         input_data
     }