diff --git a/cookbook/README.md b/cookbook/README.md
index 4fcce7e672..8e0253edb4 100644
--- a/cookbook/README.md
+++ b/cookbook/README.md
@@ -138,7 +138,7 @@ The following example is a spec proposal of Optimism mainnet and testnet. Note t
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -162,7 +162,7 @@ The following example is a spec proposal of Optimism mainnet and testnet. Note t
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -186,7 +186,7 @@ The following example is a spec proposal of Optimism mainnet and testnet. Note t
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -210,7 +210,7 @@ The following example is a spec proposal of Optimism mainnet and testnet. Note t
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -234,7 +234,7 @@ The following example is a spec proposal of Optimism mainnet and testnet. Note t
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
diff --git a/cookbook/backups/spec_add_optimism_fast_lookup.json b/cookbook/backups/spec_add_optimism_fast_lookup.json
index 69dbfe514c..a37ece5df7 100644
--- a/cookbook/backups/spec_add_optimism_fast_lookup.json
+++ b/cookbook/backups/spec_add_optimism_fast_lookup.json
@@ -44,7 +44,7 @@
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -68,7 +68,7 @@
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -92,7 +92,7 @@
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -116,7 +116,7 @@
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]
@@ -140,7 +140,7 @@
                                     "stateful": 0
                                 },
                                 "interface": "jsonrpc",
-                                "type": "GET",
+                                "type": "POST",
                                 "extra_compute_units": "0"
                             }
                         ]