diff --git a/contracts/replier/.cargo/config.toml b/contracts/replier/.cargo/config.toml
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index 0000000000..f5174787c2
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diff --git a/contracts/replier/Cargo.toml b/contracts/replier/Cargo.toml
new file mode 100644
index 0000000000..36e13b1117
--- /dev/null
+++ b/contracts/replier/Cargo.toml
@@ -0,0 +1,33 @@
+[package]
+name = "replier"
+version = "0.0.0"
+authors = ["Tomasz Kulik <tomek.k@confio.gmbh>"]
+edition = "2024"
+publish = false
+license = "Apache-2.0"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[profile.release]
+opt-level = 3
+debug = false
+rpath = false
+lto = true
+debug-assertions = false
+codegen-units = 1
+panic = 'abort'
+incremental = false
+overflow-checks = true
+
+[dependencies]
+cosmwasm-schema = { path = "../../packages/schema" }
+cosmwasm-std = { path = "../../packages/std", default-features = false, features = [
+    "abort",
+    "cosmwasm_2_2",
+    "std",
+] }
+schemars = "0.8.12"
+serde = { version = "1.0.103", default-features = false, features = ["derive"] }
diff --git a/contracts/replier/schema/hackatom.json b/contracts/replier/schema/hackatom.json
new file mode 100644
index 0000000000..307c89871f
--- /dev/null
+++ b/contracts/replier/schema/hackatom.json
@@ -0,0 +1,406 @@
+{
+  "contract_name": "hackatom",
+  "contract_version": "0.0.0",
+  "idl_version": "1.0.0",
+  "instantiate": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "InstantiateMsg",
+    "type": "object",
+    "required": [
+      "beneficiary",
+      "verifier"
+    ],
+    "properties": {
+      "beneficiary": {
+        "type": "string"
+      },
+      "verifier": {
+        "type": "string"
+      }
+    },
+    "additionalProperties": false
+  },
+  "execute": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "ExecuteMsg",
+    "oneOf": [
+      {
+        "description": "Releasing all funds in the contract to the beneficiary. This is the only \"proper\" action of this demo contract.",
+        "type": "object",
+        "required": [
+          "release"
+        ],
+        "properties": {
+          "release": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Infinite loop to burn cpu cycles (only run when metering is enabled)",
+        "type": "object",
+        "required": [
+          "cpu_loop"
+        ],
+        "properties": {
+          "cpu_loop": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Infinite loop making storage calls (to test when their limit hits)",
+        "type": "object",
+        "required": [
+          "storage_loop"
+        ],
+        "properties": {
+          "storage_loop": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Infinite loop reading and writing memory",
+        "type": "object",
+        "required": [
+          "memory_loop"
+        ],
+        "properties": {
+          "memory_loop": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Infinite loop sending message to itself",
+        "type": "object",
+        "required": [
+          "message_loop"
+        ],
+        "properties": {
+          "message_loop": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Allocate large amounts of memory without consuming much gas",
+        "type": "object",
+        "required": [
+          "allocate_large_memory"
+        ],
+        "properties": {
+          "allocate_large_memory": {
+            "type": "object",
+            "required": [
+              "pages"
+            ],
+            "properties": {
+              "pages": {
+                "type": "integer",
+                "format": "uint32",
+                "minimum": 0.0
+              }
+            },
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Trigger a panic to ensure framework handles gracefully",
+        "type": "object",
+        "required": [
+          "panic"
+        ],
+        "properties": {
+          "panic": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Starting with CosmWasm 0.10, some API calls return user errors back to the contract. This triggers such user errors, ensuring the transaction does not fail in the backend.",
+        "type": "object",
+        "required": [
+          "user_errors_in_api_calls"
+        ],
+        "properties": {
+          "user_errors_in_api_calls": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      }
+    ]
+  },
+  "query": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "QueryMsg",
+    "oneOf": [
+      {
+        "description": "returns a human-readable representation of the verifier use to ensure query path works in integration tests",
+        "type": "object",
+        "required": [
+          "verifier"
+        ],
+        "properties": {
+          "verifier": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "This returns cosmwasm_std::AllBalanceResponse to demo use of the querier",
+        "type": "object",
+        "required": [
+          "other_balance"
+        ],
+        "properties": {
+          "other_balance": {
+            "type": "object",
+            "required": [
+              "address"
+            ],
+            "properties": {
+              "address": {
+                "type": "string"
+              }
+            },
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "Recurse will execute a query into itself up to depth-times and return Each step of the recursion may perform some extra work to test gas metering (`work` rounds of sha256 on contract). Now that we have Env, we can auto-calculate the address to recurse into",
+        "type": "object",
+        "required": [
+          "recurse"
+        ],
+        "properties": {
+          "recurse": {
+            "type": "object",
+            "required": [
+              "depth",
+              "work"
+            ],
+            "properties": {
+              "depth": {
+                "type": "integer",
+                "format": "uint32",
+                "minimum": 0.0
+              },
+              "work": {
+                "type": "integer",
+                "format": "uint32",
+                "minimum": 0.0
+              }
+            },
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      },
+      {
+        "description": "GetInt returns a hardcoded u32 value",
+        "type": "object",
+        "required": [
+          "get_int"
+        ],
+        "properties": {
+          "get_int": {
+            "type": "object",
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      }
+    ]
+  },
+  "migrate": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "MigrateMsg",
+    "description": "MigrateMsg allows a privileged contract administrator to run a migration on the contract. In this (demo) case it is just migrating from one hackatom code to the same code, but taking advantage of the migration step to set a new validator.\n\nNote that the contract doesn't enforce permissions here, this is done by blockchain logic (in the future by blockchain governance)",
+    "type": "object",
+    "required": [
+      "verifier"
+    ],
+    "properties": {
+      "verifier": {
+        "type": "string"
+      }
+    },
+    "additionalProperties": false
+  },
+  "sudo": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "SudoMsg",
+    "description": "SudoMsg is only exposed for internal Cosmos SDK modules to call. This is showing how we can expose \"admin\" functionality than can not be called by external users or contracts, but only trusted (native/Go) code in the blockchain",
+    "oneOf": [
+      {
+        "type": "object",
+        "required": [
+          "steal_funds"
+        ],
+        "properties": {
+          "steal_funds": {
+            "type": "object",
+            "required": [
+              "amount",
+              "recipient"
+            ],
+            "properties": {
+              "amount": {
+                "type": "array",
+                "items": {
+                  "$ref": "#/definitions/Coin"
+                }
+              },
+              "recipient": {
+                "type": "string"
+              }
+            },
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      }
+    ],
+    "definitions": {
+      "Coin": {
+        "type": "object",
+        "required": [
+          "amount",
+          "denom"
+        ],
+        "properties": {
+          "amount": {
+            "$ref": "#/definitions/Uint128"
+          },
+          "denom": {
+            "type": "string"
+          }
+        },
+        "additionalProperties": false
+      },
+      "Uint128": {
+        "description": "A thin wrapper around u128 that is using strings for JSON encoding/decoding, such that the full u128 range can be used for clients that convert JSON numbers to floats, like JavaScript and jq.\n\n# Examples\n\nUse `from` to create instances of this and `u128` to get the value out:\n\n``` # use cosmwasm_std::Uint128; let a = Uint128::from(123u128); assert_eq!(a.u128(), 123);\n\nlet b = Uint128::from(42u64); assert_eq!(b.u128(), 42);\n\nlet c = Uint128::from(70u32); assert_eq!(c.u128(), 70); ```",
+        "type": "string"
+      }
+    }
+  },
+  "responses": {
+    "get_int": {
+      "$schema": "http://json-schema.org/draft-07/schema#",
+      "title": "IntResponse",
+      "type": "object",
+      "required": [
+        "int"
+      ],
+      "properties": {
+        "int": {
+          "type": "integer",
+          "format": "uint32",
+          "minimum": 0.0
+        }
+      },
+      "additionalProperties": false
+    },
+    "other_balance": {
+      "$schema": "http://json-schema.org/draft-07/schema#",
+      "title": "AllBalanceResponse",
+      "type": "object",
+      "required": [
+        "amount"
+      ],
+      "properties": {
+        "amount": {
+          "description": "Returns all non-zero coins held by this account.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Coin"
+          }
+        }
+      },
+      "additionalProperties": false,
+      "definitions": {
+        "Coin": {
+          "type": "object",
+          "required": [
+            "amount",
+            "denom"
+          ],
+          "properties": {
+            "amount": {
+              "$ref": "#/definitions/Uint128"
+            },
+            "denom": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        },
+        "Uint128": {
+          "description": "A thin wrapper around u128 that is using strings for JSON encoding/decoding, such that the full u128 range can be used for clients that convert JSON numbers to floats, like JavaScript and jq.\n\n# Examples\n\nUse `from` to create instances of this and `u128` to get the value out:\n\n``` # use cosmwasm_std::Uint128; let a = Uint128::from(123u128); assert_eq!(a.u128(), 123);\n\nlet b = Uint128::from(42u64); assert_eq!(b.u128(), 42);\n\nlet c = Uint128::from(70u32); assert_eq!(c.u128(), 70); ```",
+          "type": "string"
+        }
+      }
+    },
+    "recurse": {
+      "$schema": "http://json-schema.org/draft-07/schema#",
+      "title": "RecurseResponse",
+      "type": "object",
+      "required": [
+        "hashed"
+      ],
+      "properties": {
+        "hashed": {
+          "description": "hashed is the result of running sha256 \"work+1\" times on the contract's human address",
+          "allOf": [
+            {
+              "$ref": "#/definitions/Binary"
+            }
+          ]
+        }
+      },
+      "additionalProperties": false,
+      "definitions": {
+        "Binary": {
+          "description": "Binary is a wrapper around Vec<u8> to add base64 de/serialization with serde. It also adds some helper methods to help encode inline.\n\nThis is only needed as serde-json-{core,wasm} has a horrible encoding for Vec<u8>. See also <https://github.com/CosmWasm/cosmwasm/blob/main/docs/MESSAGE_TYPES.md>.",
+          "type": "string"
+        }
+      }
+    },
+    "verifier": {
+      "$schema": "http://json-schema.org/draft-07/schema#",
+      "title": "VerifierResponse",
+      "type": "object",
+      "required": [
+        "verifier"
+      ],
+      "properties": {
+        "verifier": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": false
+    }
+  }
+}
diff --git a/contracts/replier/schema/raw/execute.json b/contracts/replier/schema/raw/execute.json
new file mode 100644
index 0000000000..a82fdeef2d
--- /dev/null
+++ b/contracts/replier/schema/raw/execute.json
@@ -0,0 +1,128 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "ExecuteMsg",
+  "oneOf": [
+    {
+      "description": "Releasing all funds in the contract to the beneficiary. This is the only \"proper\" action of this demo contract.",
+      "type": "object",
+      "required": [
+        "release"
+      ],
+      "properties": {
+        "release": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Infinite loop to burn cpu cycles (only run when metering is enabled)",
+      "type": "object",
+      "required": [
+        "cpu_loop"
+      ],
+      "properties": {
+        "cpu_loop": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Infinite loop making storage calls (to test when their limit hits)",
+      "type": "object",
+      "required": [
+        "storage_loop"
+      ],
+      "properties": {
+        "storage_loop": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Infinite loop reading and writing memory",
+      "type": "object",
+      "required": [
+        "memory_loop"
+      ],
+      "properties": {
+        "memory_loop": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Infinite loop sending message to itself",
+      "type": "object",
+      "required": [
+        "message_loop"
+      ],
+      "properties": {
+        "message_loop": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Allocate large amounts of memory without consuming much gas",
+      "type": "object",
+      "required": [
+        "allocate_large_memory"
+      ],
+      "properties": {
+        "allocate_large_memory": {
+          "type": "object",
+          "required": [
+            "pages"
+          ],
+          "properties": {
+            "pages": {
+              "type": "integer",
+              "format": "uint32",
+              "minimum": 0.0
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Trigger a panic to ensure framework handles gracefully",
+      "type": "object",
+      "required": [
+        "panic"
+      ],
+      "properties": {
+        "panic": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Starting with CosmWasm 0.10, some API calls return user errors back to the contract. This triggers such user errors, ensuring the transaction does not fail in the backend.",
+      "type": "object",
+      "required": [
+        "user_errors_in_api_calls"
+      ],
+      "properties": {
+        "user_errors_in_api_calls": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  ]
+}
diff --git a/contracts/replier/schema/raw/instantiate.json b/contracts/replier/schema/raw/instantiate.json
new file mode 100644
index 0000000000..8639103d34
--- /dev/null
+++ b/contracts/replier/schema/raw/instantiate.json
@@ -0,0 +1,18 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "InstantiateMsg",
+  "type": "object",
+  "required": [
+    "beneficiary",
+    "verifier"
+  ],
+  "properties": {
+    "beneficiary": {
+      "type": "string"
+    },
+    "verifier": {
+      "type": "string"
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/contracts/replier/schema/raw/migrate.json b/contracts/replier/schema/raw/migrate.json
new file mode 100644
index 0000000000..2696e3ac26
--- /dev/null
+++ b/contracts/replier/schema/raw/migrate.json
@@ -0,0 +1,15 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "MigrateMsg",
+  "description": "MigrateMsg allows a privileged contract administrator to run a migration on the contract. In this (demo) case it is just migrating from one hackatom code to the same code, but taking advantage of the migration step to set a new validator.\n\nNote that the contract doesn't enforce permissions here, this is done by blockchain logic (in the future by blockchain governance)",
+  "type": "object",
+  "required": [
+    "verifier"
+  ],
+  "properties": {
+    "verifier": {
+      "type": "string"
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/contracts/replier/schema/raw/query.json b/contracts/replier/schema/raw/query.json
new file mode 100644
index 0000000000..dfd58202b2
--- /dev/null
+++ b/contracts/replier/schema/raw/query.json
@@ -0,0 +1,86 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "QueryMsg",
+  "oneOf": [
+    {
+      "description": "returns a human-readable representation of the verifier use to ensure query path works in integration tests",
+      "type": "object",
+      "required": [
+        "verifier"
+      ],
+      "properties": {
+        "verifier": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "This returns cosmwasm_std::AllBalanceResponse to demo use of the querier",
+      "type": "object",
+      "required": [
+        "other_balance"
+      ],
+      "properties": {
+        "other_balance": {
+          "type": "object",
+          "required": [
+            "address"
+          ],
+          "properties": {
+            "address": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "Recurse will execute a query into itself up to depth-times and return Each step of the recursion may perform some extra work to test gas metering (`work` rounds of sha256 on contract). Now that we have Env, we can auto-calculate the address to recurse into",
+      "type": "object",
+      "required": [
+        "recurse"
+      ],
+      "properties": {
+        "recurse": {
+          "type": "object",
+          "required": [
+            "depth",
+            "work"
+          ],
+          "properties": {
+            "depth": {
+              "type": "integer",
+              "format": "uint32",
+              "minimum": 0.0
+            },
+            "work": {
+              "type": "integer",
+              "format": "uint32",
+              "minimum": 0.0
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    },
+    {
+      "description": "GetInt returns a hardcoded u32 value",
+      "type": "object",
+      "required": [
+        "get_int"
+      ],
+      "properties": {
+        "get_int": {
+          "type": "object",
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  ]
+}
diff --git a/contracts/replier/schema/raw/response_to_get_int.json b/contracts/replier/schema/raw/response_to_get_int.json
new file mode 100644
index 0000000000..018fd695e1
--- /dev/null
+++ b/contracts/replier/schema/raw/response_to_get_int.json
@@ -0,0 +1,16 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "IntResponse",
+  "type": "object",
+  "required": [
+    "int"
+  ],
+  "properties": {
+    "int": {
+      "type": "integer",
+      "format": "uint32",
+      "minimum": 0.0
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/contracts/replier/schema/raw/response_to_other_balance.json b/contracts/replier/schema/raw/response_to_other_balance.json
new file mode 100644
index 0000000000..46aa76ef1b
--- /dev/null
+++ b/contracts/replier/schema/raw/response_to_other_balance.json
@@ -0,0 +1,40 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "AllBalanceResponse",
+  "type": "object",
+  "required": [
+    "amount"
+  ],
+  "properties": {
+    "amount": {
+      "description": "Returns all non-zero coins held by this account.",
+      "type": "array",
+      "items": {
+        "$ref": "#/definitions/Coin"
+      }
+    }
+  },
+  "additionalProperties": false,
+  "definitions": {
+    "Coin": {
+      "type": "object",
+      "required": [
+        "amount",
+        "denom"
+      ],
+      "properties": {
+        "amount": {
+          "$ref": "#/definitions/Uint128"
+        },
+        "denom": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": false
+    },
+    "Uint128": {
+      "description": "A thin wrapper around u128 that is using strings for JSON encoding/decoding, such that the full u128 range can be used for clients that convert JSON numbers to floats, like JavaScript and jq.\n\n# Examples\n\nUse `from` to create instances of this and `u128` to get the value out:\n\n``` # use cosmwasm_std::Uint128; let a = Uint128::from(123u128); assert_eq!(a.u128(), 123);\n\nlet b = Uint128::from(42u64); assert_eq!(b.u128(), 42);\n\nlet c = Uint128::from(70u32); assert_eq!(c.u128(), 70); ```",
+      "type": "string"
+    }
+  }
+}
diff --git a/contracts/replier/schema/raw/response_to_recurse.json b/contracts/replier/schema/raw/response_to_recurse.json
new file mode 100644
index 0000000000..3d50847ef9
--- /dev/null
+++ b/contracts/replier/schema/raw/response_to_recurse.json
@@ -0,0 +1,25 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "RecurseResponse",
+  "type": "object",
+  "required": [
+    "hashed"
+  ],
+  "properties": {
+    "hashed": {
+      "description": "hashed is the result of running sha256 \"work+1\" times on the contract's human address",
+      "allOf": [
+        {
+          "$ref": "#/definitions/Binary"
+        }
+      ]
+    }
+  },
+  "additionalProperties": false,
+  "definitions": {
+    "Binary": {
+      "description": "Binary is a wrapper around Vec<u8> to add base64 de/serialization with serde. It also adds some helper methods to help encode inline.\n\nThis is only needed as serde-json-{core,wasm} has a horrible encoding for Vec<u8>. See also <https://github.com/CosmWasm/cosmwasm/blob/main/docs/MESSAGE_TYPES.md>.",
+      "type": "string"
+    }
+  }
+}
diff --git a/contracts/replier/schema/raw/response_to_verifier.json b/contracts/replier/schema/raw/response_to_verifier.json
new file mode 100644
index 0000000000..fb04c86d67
--- /dev/null
+++ b/contracts/replier/schema/raw/response_to_verifier.json
@@ -0,0 +1,14 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "VerifierResponse",
+  "type": "object",
+  "required": [
+    "verifier"
+  ],
+  "properties": {
+    "verifier": {
+      "type": "string"
+    }
+  },
+  "additionalProperties": false
+}
diff --git a/contracts/replier/schema/raw/sudo.json b/contracts/replier/schema/raw/sudo.json
new file mode 100644
index 0000000000..5391911bd6
--- /dev/null
+++ b/contracts/replier/schema/raw/sudo.json
@@ -0,0 +1,57 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "SudoMsg",
+  "description": "SudoMsg is only exposed for internal Cosmos SDK modules to call. This is showing how we can expose \"admin\" functionality than can not be called by external users or contracts, but only trusted (native/Go) code in the blockchain",
+  "oneOf": [
+    {
+      "type": "object",
+      "required": [
+        "steal_funds"
+      ],
+      "properties": {
+        "steal_funds": {
+          "type": "object",
+          "required": [
+            "amount",
+            "recipient"
+          ],
+          "properties": {
+            "amount": {
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/Coin"
+              }
+            },
+            "recipient": {
+              "type": "string"
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  ],
+  "definitions": {
+    "Coin": {
+      "type": "object",
+      "required": [
+        "amount",
+        "denom"
+      ],
+      "properties": {
+        "amount": {
+          "$ref": "#/definitions/Uint128"
+        },
+        "denom": {
+          "type": "string"
+        }
+      },
+      "additionalProperties": false
+    },
+    "Uint128": {
+      "description": "A thin wrapper around u128 that is using strings for JSON encoding/decoding, such that the full u128 range can be used for clients that convert JSON numbers to floats, like JavaScript and jq.\n\n# Examples\n\nUse `from` to create instances of this and `u128` to get the value out:\n\n``` # use cosmwasm_std::Uint128; let a = Uint128::from(123u128); assert_eq!(a.u128(), 123);\n\nlet b = Uint128::from(42u64); assert_eq!(b.u128(), 42);\n\nlet c = Uint128::from(70u32); assert_eq!(c.u128(), 70); ```",
+      "type": "string"
+    }
+  }
+}
diff --git a/contracts/replier/src/bin/schema.rs b/contracts/replier/src/bin/schema.rs
new file mode 100644
index 0000000000..f370eb6b4e
--- /dev/null
+++ b/contracts/replier/src/bin/schema.rs
@@ -0,0 +1,11 @@
+use cosmwasm_schema::write_api;
+
+use replier::{ExecuteMsg, InstantiateMsg, QueryMsg};
+
+fn main() {
+    write_api! {
+        instantiate: InstantiateMsg,
+        query: QueryMsg,
+        execute: ExecuteMsg,
+    }
+}
diff --git a/contracts/replier/src/lib.rs b/contracts/replier/src/lib.rs
new file mode 100644
index 0000000000..2282b674b8
--- /dev/null
+++ b/contracts/replier/src/lib.rs
@@ -0,0 +1,151 @@
+use cosmwasm_schema::{cw_serde, QueryResponses};
+use cosmwasm_std::{
+    entry_point, from_json, to_json_binary, to_json_vec, Binary, Deps, DepsMut, Env, MessageInfo,
+    QueryResponse, Reply, ReplyOn, Response, StdError, StdResult, SubMsg, WasmMsg,
+};
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+#[cw_serde]
+pub struct InstantiateMsg {}
+
+#[cw_serde]
+pub struct ExecuteMsg {
+    msg_id: u8,
+    set_data_in_exec_and_reply: bool,
+    return_order_in_reply: bool,
+    exec_error: bool,
+    reply_error: bool,
+    reply_on_never: bool,
+    messages: Vec<ExecuteMsg>,
+}
+
+#[cw_serde]
+#[derive(QueryResponses)]
+pub enum QueryMsg {}
+
+pub const CONFIG_KEY: &[u8] = b"config";
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
+pub struct State {
+    pub order: Vec<u8>,
+}
+
+#[entry_point]
+pub fn instantiate(
+    deps: DepsMut,
+    _env: Env,
+    _info: MessageInfo,
+    _msg: InstantiateMsg,
+) -> StdResult<Response> {
+    deps.storage
+        .set(CONFIG_KEY, &to_json_vec(&State { order: vec![] })?);
+    Ok(Response::new())
+}
+
+#[entry_point]
+pub fn execute(
+    deps: DepsMut,
+    env: Env,
+    _info: MessageInfo,
+    msg: ExecuteMsg,
+) -> StdResult<Response> {
+    let data = deps.storage.get(CONFIG_KEY).unwrap();
+    let mut config: State = from_json(data)?;
+    if msg.msg_id <= 1 {
+        config.order.clear();
+    }
+    config.order.extend([0xEE, msg.msg_id]);
+    deps.storage.set(CONFIG_KEY, &to_json_vec(&config)?);
+
+    let mut resp = Response::new();
+
+    if msg.set_data_in_exec_and_reply {
+        resp = resp.set_data(Binary::new(vec![0xEE, msg.msg_id]));
+    }
+
+    if msg.exec_error {
+        return Err(StdError::generic_err(format!(
+            "Err in exec msg_id: {}",
+            msg.msg_id
+        )));
+    }
+
+    for next_msg in msg.messages {
+        let wasm_msg = WasmMsg::Execute {
+            contract_addr: env.contract.address.to_string(),
+            msg: to_json_binary(&next_msg).unwrap(),
+            funds: vec![],
+        };
+        let mut msg_id: u64 = msg.msg_id.into();
+        if msg.set_data_in_exec_and_reply {
+            msg_id = msg_id | 0x100;
+        }
+        if msg.return_order_in_reply {
+            msg_id = msg_id | 0x200;
+        }
+        if msg.reply_error {
+            msg_id = msg_id | 0x400;
+        }
+
+        let submsg = SubMsg {
+            id: msg_id,
+            payload: Binary::default(),
+            msg: wasm_msg.into(),
+            gas_limit: None,
+            reply_on: if next_msg.reply_on_never {
+                ReplyOn::Never
+            } else {
+                ReplyOn::Always
+            },
+        };
+        resp = resp.add_submessage(submsg);
+    }
+    Ok(resp)
+}
+
+#[entry_point]
+pub fn query(_deps: Deps, _env: Env, _msg: QueryMsg) -> StdResult<QueryResponse> {
+    Ok(QueryResponse::new(vec![]))
+}
+
+#[entry_point]
+pub fn reply(deps: DepsMut, _env: Env, msg: Reply) -> StdResult<Response> {
+    let msg_id = msg.id & 0xFF;
+    let should_set_data = msg.id & 0x100 != 0;
+    let should_set_order = msg.id & 0x200 != 0;
+    let should_return_error = msg.id & 0x400 != 0;
+
+    let data = deps.storage.get(CONFIG_KEY).unwrap();
+    let mut config: State = from_json(data)?;
+    config.order.extend([0xBB, msg_id as u8]);
+    deps.storage.set(CONFIG_KEY, &to_json_vec(&config)?);
+
+    if should_return_error {
+        return Err(StdError::generic_err(format!(
+            "Err in reply msg_id: {}",
+            msg_id
+        )));
+    }
+
+    let result = if msg.result.is_ok() {
+        msg.result.unwrap()
+    } else {
+        return Ok(Response::new());
+    };
+
+    if should_set_order {
+        Ok(Response::new().set_data(Binary::new(config.order)))
+    } else if should_set_data {
+        Ok(Response::new().set_data(Binary::new(
+            result
+                .msg_responses
+                .into_iter()
+                .map(|resp| resp.value.as_slice().to_vec())
+                .flatten()
+                .chain([0xBB, msg_id as u8].into_iter())
+                .collect(),
+        )))
+    } else {
+        Ok(Response::new())
+    }
+}
diff --git a/contracts/replier/src/schema/raw/execute.json b/contracts/replier/src/schema/raw/execute.json
new file mode 100644
index 0000000000..7268770ffa
--- /dev/null
+++ b/contracts/replier/src/schema/raw/execute.json
@@ -0,0 +1,29 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "ExecuteMsg",
+  "oneOf": [
+    {
+      "type": "object",
+      "required": [
+        "call"
+      ],
+      "properties": {
+        "call": {
+          "type": "object",
+          "required": [
+            "counter"
+          ],
+          "properties": {
+            "counter": {
+              "type": "integer",
+              "format": "uint8",
+              "minimum": 0.0
+            }
+          },
+          "additionalProperties": false
+        }
+      },
+      "additionalProperties": false
+    }
+  ]
+}
diff --git a/contracts/replier/src/schema/raw/instantiate.json b/contracts/replier/src/schema/raw/instantiate.json
new file mode 100644
index 0000000000..1352613d57
--- /dev/null
+++ b/contracts/replier/src/schema/raw/instantiate.json
@@ -0,0 +1,6 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "InstantiateMsg",
+  "type": "object",
+  "additionalProperties": false
+}
diff --git a/contracts/replier/src/schema/raw/query.json b/contracts/replier/src/schema/raw/query.json
new file mode 100644
index 0000000000..0f592a1af0
--- /dev/null
+++ b/contracts/replier/src/schema/raw/query.json
@@ -0,0 +1,6 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "QueryMsg",
+  "type": "string",
+  "enum": []
+}
diff --git a/contracts/replier/src/schema/replier.json b/contracts/replier/src/schema/replier.json
new file mode 100644
index 0000000000..0682cc09e2
--- /dev/null
+++ b/contracts/replier/src/schema/replier.json
@@ -0,0 +1,49 @@
+{
+  "contract_name": "replier",
+  "contract_version": "0.0.0",
+  "idl_version": "1.0.0",
+  "instantiate": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "InstantiateMsg",
+    "type": "object",
+    "additionalProperties": false
+  },
+  "execute": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "ExecuteMsg",
+    "oneOf": [
+      {
+        "type": "object",
+        "required": [
+          "call"
+        ],
+        "properties": {
+          "call": {
+            "type": "object",
+            "required": [
+              "counter"
+            ],
+            "properties": {
+              "counter": {
+                "type": "integer",
+                "format": "uint8",
+                "minimum": 0.0
+              }
+            },
+            "additionalProperties": false
+          }
+        },
+        "additionalProperties": false
+      }
+    ]
+  },
+  "query": {
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "QueryMsg",
+    "type": "string",
+    "enum": []
+  },
+  "migrate": null,
+  "sudo": null,
+  "responses": {}
+}