diff --git a/api/starknet_api_openrpc.json b/api/starknet_api_openrpc.json
index 9cabca7..d144a5a 100644
--- a/api/starknet_api_openrpc.json
+++ b/api/starknet_api_openrpc.json
@@ -813,7 +813,7 @@
             ],
             "result": {
                 "name": "result",
-                "description": "The last nonce used for the given contract.",
+                "description": "The contract's nonce at the requested state",
                 "schema": {
                     "title": "Field element",
                     "$ref": "#/components/schemas/FELT"
@@ -1588,6 +1588,10 @@
             "DECLARE_TXN": {
                 "title": "Declare transaction",
                 "oneOf": [
+                    {
+                        "title": "Declare transaction V0",
+                        "$ref": "#/components/schemas/DECLARE_TXN_V0"
+                    },
                     {
                         "title": "Declare transaction V1",
                         "$ref": "#/components/schemas/DECLARE_TXN_V1"
@@ -1598,6 +1602,88 @@
                     }
                 ]
             },
+            "DECLARE_TXN_V0": {
+                "title": "Declare Contract Transaction V0",
+                "description": "Declare Contract Transaction V0",
+                "allOf": [
+                    {
+                        "type": "object",
+                        "title": "Declare txn v0",
+                        "properties": {
+                            "type": {
+                                "title": "Declare",
+                                "type": "string",
+                                "enum": [
+                                    "DECLARE"
+                                ]
+                            },
+                            "sender_address": {
+                                "title": "Sender address",
+                                "description": "The address of the account contract sending the declaration transaction",
+                                "$ref": "#/components/schemas/ADDRESS"
+                            },
+                            "max_fee": {
+                                "title": "Max fee",
+                                "$ref": "#/components/schemas/FELT",
+                                "description": "The maximal fee that can be charged for including the transaction"
+                            },
+                            "version": {
+                                "title": "Version",
+                                "description": "Version of the transaction scheme",
+                                "type": "string",
+                                "enum": [
+                                    "0x0"
+                                ]
+                            },
+                            "signature": {
+                                "title": "Signature",
+                                "$ref": "#/components/schemas/SIGNATURE"
+                            }
+                        },
+                        "required": [
+                            "type",
+                            "sender_address",
+                            "max_fee",
+                            "version",
+                            "signature"
+                        ]
+                    },
+                    {
+                        "oneOf": [
+                            {
+                                "type": "object",
+                                "title": "ContractClass",
+                                "description": "The class to be declared. Expected to be included for all methods involving execution (estimateFee, simulateTransactions)",
+                                "properties": {
+                                    "contract_class": {
+                                        "title": "Contract class",
+                                        "description": "The class to be declared",
+                                        "$ref": "#/components/schemas/DEPRECATED_CONTRACT_CLASS"
+                                    }
+                                },
+                                "required": [
+                                    "contract_class"
+                                ]
+                            },
+                            {
+                                "type": "object",
+                                "title": "ClassHash",
+                                "description": "The hash of the declared class. Responses to getBlock and getTransaction are expected to include the hash rather than the full definition",
+                                "properties": {
+                                    "class_hash": {
+                                        "title": "Class hash",
+                                        "description": "The hash of the declared class",
+                                        "$ref": "#/components/schemas/FELT"
+                                    }
+                                },
+                                "required": [
+                                    "class_hash"
+                                ]
+                            }
+                        ]
+                    }
+                ]
+            },
             "DECLARE_TXN_V1": {
                 "title": "Declare Contract Transaction V1",
                 "description": "Declare Contract Transaction V1",
@@ -1661,7 +1747,10 @@
                                         "description": "The class to be declared",
                                         "$ref": "#/components/schemas/DEPRECATED_CONTRACT_CLASS"
                                     }
-                                }
+                                },
+                                "required": [
+                                    "contract_class"
+                                ]
                             },
                             {
                                 "type": "object",
@@ -1673,7 +1762,10 @@
                                         "description": "The hash of the declared class",
                                         "$ref": "#/components/schemas/FELT"
                                     }
-                                }
+                                },
+                                "required": [
+                                    "class_hash"
+                                ]
                             }
                         ]
                     }
@@ -1748,7 +1840,10 @@
                                         "description": "The class to be declared",
                                         "$ref": "#/components/schemas/CONTRACT_CLASS"
                                     }
-                                }
+                                },
+                                "required": [
+                                    "countract_class"
+                                ]
                             },
                             {
                                 "type": "object",
@@ -1760,7 +1855,10 @@
                                         "description": "The hash of the declared class",
                                         "$ref": "#/components/schemas/FELT"
                                     }
-                                }
+                                },
+                                "required": [
+                                    "class_hash"
+                                ]
                             }
                         ]
                     }
@@ -2924,4 +3022,4 @@
             }
         }
     }
-}
+}
\ No newline at end of file
diff --git a/api/starknet_write_api.json b/api/starknet_write_api.json
index 53c8307..3afc574 100644
--- a/api/starknet_write_api.json
+++ b/api/starknet_write_api.json
@@ -70,7 +70,14 @@
                     "required": true,
                     "schema": {
                         "title": "Declare transaction",
-                        "$ref": "#/components/schemas/DECLARE_TXN"
+                        "oneOf": [
+                            {
+                                "$ref": "#/components/schemas/DECLARE_TXN_V1"
+                            },
+                            {
+                                "$ref": "#/components/schemas/DECLARE_TXN_V2"
+                            }
+                        ]
                     }
                 }
             ],
@@ -214,8 +221,11 @@
             "INVOKE_TXN_V1": {
                 "$ref": "./api/starknet_api_openrpc.json#/components/schemas/INVOKE_TXN_V1"
             },
-            "DECLARE_TXN": {
-                "$ref": "./api/starknet_api_openrpc.json#/components/schemas/DECLARE_TXN"
+            "DECLARE_TXN_V1": {
+                "$ref": "./api/starknet_api_openrpc.json#/components/schemas/DECLARE_TXN_V1"
+            },
+            "DECLARE_TXN_V2": {
+                "$ref": "./api/starknet_api_openrpc.json#/components/schemas/DECLARE_TXN_V2"
             },
             "DEPLOY_ACCOUNT_TXN": {
                 "$ref": "./api/starknet_api_openrpc.json#/components/schemas/DEPLOY_ACCOUNT_TXN"