diff --git a/rips/rustchain-core/api/rpc.py b/rips/rustchain-core/api/rpc.py
index 08b7c8563..220e9aa49 100644
--- a/rips/rustchain-core/api/rpc.py
+++ b/rips/rustchain-core/api/rpc.py
@@ -21,6 +21,22 @@
 import threading
 
 
+RPC_ALLOWED_METHODS = frozenset({
+    "getStats",
+    "getBlock",
+    "getBlockByHash",
+    "getWallet",
+    "getBalance",
+    "getMiningStatus",
+    "getAntiquityScore",
+    "getProposals",
+    "getProposal",
+    "getNodeInfo",
+    "getPeers",
+    "getEntropyProfile",
+})
+
+
 # =============================================================================
 # API Response
 # =============================================================================
@@ -325,7 +341,13 @@ def _route_request(self, path: str, params: Dict[str, Any]) -> ApiResponse:
         # JSON-RPC endpoint
         if path == "/rpc":
             method = params.get("method", "")
+            if method not in RPC_ALLOWED_METHODS:
+                return ApiResponse(success=False, error=f"Method not allowed: {method}")
+
             rpc_params = params.get("params", {})
+            if not isinstance(rpc_params, dict):
+                return ApiResponse(success=False, error="RPC params must be an object")
+
             return self.api.rpc.call(method, rpc_params)
 
         return ApiResponse(success=False, error=f"Unknown endpoint: {path}")
diff --git a/tests/test_json_rpc_method_whitelist.py b/tests/test_json_rpc_method_whitelist.py
new file mode 100644
index 000000000..1fcfb563b
--- /dev/null
+++ b/tests/test_json_rpc_method_whitelist.py
@@ -0,0 +1,78 @@
+import importlib
+import sys
+from pathlib import Path
+
+
+RUSTCHAIN_CORE = Path(__file__).resolve().parents[1] / "rips" / "rustchain-core"
+sys.path.insert(0, str(RUSTCHAIN_CORE))
+
+rpc = importlib.import_module("api.rpc")
+
+
+class SpyNode(rpc.MockNode):
+    def __init__(self):
+        super().__init__()
+        self.created_proposals = 0
+        self.submitted_proofs = 0
+        self.votes = 0
+
+    def create_proposal(self, **kwargs):
+        self.created_proposals += 1
+        return super().create_proposal(**kwargs)
+
+    def submit_mining_proof(self, **kwargs):
+        self.submitted_proofs += 1
+        return super().submit_mining_proof(**kwargs)
+
+    def vote_proposal(self, **kwargs):
+        self.votes += 1
+        return super().vote_proposal(**kwargs)
+
+
+def make_handler(node):
+    handler = object.__new__(rpc.ApiRequestHandler)
+    handler.api = rpc.RustChainApi(node)
+    return handler
+
+
+def test_json_rpc_blocks_state_changing_methods():
+    node = SpyNode()
+    handler = make_handler(node)
+
+    for method in ("createProposal", "submitProof", "vote"):
+        response = handler._route_request("/rpc", {"method": method, "params": {}})
+        assert response.success is False
+        assert response.error == f"Method not allowed: {method}"
+
+    assert node.created_proposals == 0
+    assert node.submitted_proofs == 0
+    assert node.votes == 0
+
+
+def test_json_rpc_allows_read_only_methods():
+    node = SpyNode()
+    handler = make_handler(node)
+
+    stats = handler._route_request("/rpc", {"method": "getStats", "params": {}})
+    wallet = handler._route_request(
+        "/rpc",
+        {"method": "getWallet", "params": {"address": "RTC1Test"}},
+    )
+
+    assert stats.success is True
+    assert stats.data["chain_id"] == 2718
+    assert wallet.success is True
+    assert wallet.data["address"] == "RTC1Test"
+
+
+def test_json_rpc_rejects_non_object_params():
+    node = SpyNode()
+    handler = make_handler(node)
+
+    response = handler._route_request(
+        "/rpc",
+        {"method": "getWallet", "params": ["not", "an", "object"]},
+    )
+
+    assert response.success is False
+    assert response.error == "RPC params must be an object"