diff --git a/src/rpc_cache_handler/eth_get_logs.rs b/src/rpc_cache_handler/eth_get_logs.rs
index 0a58a0b..785ada8 100644
--- a/src/rpc_cache_handler/eth_get_logs.rs
+++ b/src/rpc_cache_handler/eth_get_logs.rs
@@ -1,5 +1,5 @@
 use alloy_primitives::B256;
-use anyhow::Context;
+use anyhow::{bail, Context};
 use serde_json::Value;
 use std::str::FromStr;
 
@@ -15,11 +15,15 @@ impl RpcCacheHandler for Handler {
     }
 
     fn extract_cache_key(&self, params: &Value) -> anyhow::Result<Option<String>> {
-        let params = &require_array_params(params, common::ParamsSpec::Exact(1))?[0];
+        let params = &require_array_params(params, common::ParamsSpec::Exact(1))?;
 
-        let filter = params[0]
-            .as_object()
-            .context("params[0] not a filter object")?;
+        println!("params: {:?}", params);
+
+        let filter = &params[0];
+
+        if !filter.is_object() {
+            bail!("params[0] not a filter object");
+        }
 
         let mut block_tag = None;
 
@@ -60,3 +64,121 @@ impl RpcCacheHandler for Handler {
         Ok(cache_key)
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use serde_json::json;
+
+    static HANDLER: Handler = Handler;
+
+    #[test]
+    fn test_block_range() {
+        let params = json!([
+          {
+            "address": [
+              "0xb59f67a8bff5d8cd03f6ac17265c550ed8f33907"
+            ],
+            "fromBlock": "0x429d3b",
+            "toBlock": "0x429d3c",
+            "topics": [
+              "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
+              "0x00000000000000000000000000b46c2526e227482e2ebb8f4c69e4674d262e75",
+              "0x00000000000000000000000054a2d42a40f51259dedd1978f6c118a0f0eff078"
+            ]
+          },
+        ]);
+
+        let cache_key = HANDLER.extract_cache_key(&params).unwrap();
+        assert_eq!(
+            cache_key,
+            Some("0x429d3b-0x429d3c-bc57b716eb2996bd7f98537dd51516bb541ca882".to_string())
+        );
+    }
+
+    #[test]
+    fn test_block_hash() {
+        let params = json!([
+          {
+            "address": [
+              "0xb59f67a8bff5d8cd03f6ac17265c550ed8f33907"
+            ],
+            "blockHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
+            "topics": [
+              "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
+              "0x00000000000000000000000000b46c2526e227482e2ebb8f4c69e4674d262e75",
+              "0x00000000000000000000000054a2d42a40f51259dedd1978f6c118a0f0eff078"
+            ]
+          },
+        ]);
+
+        let cache_key = HANDLER.extract_cache_key(&params).unwrap();
+        assert_eq!(
+            cache_key,
+            Some(
+                "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef-\
+                 b27f759a6574516ddaa99bc9534f4cfcae86d386"
+                    .to_string()
+            )
+        );
+    }
+
+    #[test]
+    fn test_invalid_block_number() {
+        let params = json!([
+          {
+            "address": [
+              "0xb59f67a8bff5d8cd03f6ac17265c550ed8f33907"
+            ],
+            "fromBlock": "0x12345ggggggg",
+            "toBlock": "0x12345",
+            "topics": [
+              "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
+              "0x00000000000000000000000000b46c2526e227482e2ebb8f4c69e4674d262e75",
+              "0x00000000000000000000000054a2d42a40f51259dedd1978f6c118a0f0eff078"
+            ]
+          },
+        ]);
+
+        let err = HANDLER.extract_cache_key(&params).unwrap_err();
+        assert_eq!(err.to_string(), "`fromBlock` is not a valid block number");
+
+        let params = json!([
+          {
+            "address": [
+              "0xb59f67a8bff5d8cd03f6ac17265c550ed8f33907"
+            ],
+            "fromBlock": "0x12345",
+            "toBlock": "0x12345ggggggg",
+            "topics": [
+              "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
+              "0x00000000000000000000000000b46c2526e227482e2ebb8f4c69e4674d262e75",
+              "0x00000000000000000000000054a2d42a40f51259dedd1978f6c118a0f0eff078"
+            ]
+          },
+        ]);
+
+        let err = HANDLER.extract_cache_key(&params).unwrap_err();
+        assert_eq!(err.to_string(), "`toBlock` is not a valid block number");
+    }
+
+    #[test]
+    fn test_invalid_block_hash() {
+        let params = json!([
+          {
+            "address": [
+              "0xb59f67a8bff5d8cd03f6ac17265c550ed8f33907"
+            ],
+            "blockHash": "0x1234567890abcdef1234567890abcdef1234567890abcdef123456789ggggggg",
+            "topics": [
+              "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
+              "0x00000000000000000000000000b46c2526e227482e2ebb8f4c69e4674d262e75",
+              "0x00000000000000000000000054a2d42a40f51259dedd1978f6c118a0f0eff078"
+            ]
+          },
+        ]);
+
+        let err = HANDLER.extract_cache_key(&params).unwrap_err();
+        assert_eq!(err.to_string(), "expect a valid block hash");
+    }
+}