diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3565f11f1a..33106c95d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -45,6 +45,8 @@
   `isSearchBySentFromOrToQuery` and `isSearchByTagsQuery`.
 - @cosmjs/launchpad: Change type of `TxsResponse.logs` and
   `BroadcastTxsResponse.logs` to `unknown[]`.
+- @cosmjs/launchpad: Export `StdSignDoc` and create helpers to make and
+  serialize a `StdSignDoc`: `makeStdSignDoc` and `serializeSignDoc`.
 - @cosmjs/launchpad-ledger: Add package supporting Ledger device integration for
   Launchpad. Two new classes are provided: `LedgerSigner` (for most use cases)
   and `LaunchpadLedger` for more fine-grained access.
diff --git a/packages/launchpad/src/encoding.ts b/packages/launchpad/src/encoding.ts
index 3c09e77528..6f11b1682c 100644
--- a/packages/launchpad/src/encoding.ts
+++ b/packages/launchpad/src/encoding.ts
@@ -29,14 +29,38 @@ function sortJson(json: any): any {
  * @see https://docs.cosmos.network/master/modules/auth/03_types.html#stdsigndoc
  */
 export interface StdSignDoc {
-  readonly account_number: string;
   readonly chain_id: string;
-  readonly fee: StdFee;
-  readonly memo: string;
-  readonly msgs: readonly Msg[];
+  readonly account_number: string;
   readonly sequence: string;
+  readonly fee: StdFee;
+  readonly msgs: readonly Msg[];
+  readonly memo: string;
 }
 
+export function makeStdSignDoc(
+  msgs: readonly Msg[],
+  fee: StdFee,
+  chainId: string,
+  memo: string,
+  accountNumber: number | string,
+  sequence: number | string,
+): StdSignDoc {
+  return {
+    chain_id: chainId,
+    account_number: uint64ToString(accountNumber),
+    sequence: uint64ToString(sequence),
+    fee: fee,
+    msgs: msgs,
+    memo: memo,
+  };
+}
+
+export function serializeSignDoc(signDoc: StdSignDoc): Uint8Array {
+  const sortedSignDoc = sortJson(signDoc);
+  return toUtf8(JSON.stringify(sortedSignDoc));
+}
+
+/** A convenience helper to create the StdSignDoc and serialize it */
 export function makeSignBytes(
   msgs: readonly Msg[],
   fee: StdFee,
@@ -45,14 +69,5 @@ export function makeSignBytes(
   accountNumber: number | string,
   sequence: number | string,
 ): Uint8Array {
-  const signDoc: StdSignDoc = {
-    account_number: uint64ToString(accountNumber),
-    chain_id: chainId,
-    fee: fee,
-    memo: memo,
-    msgs: msgs,
-    sequence: uint64ToString(sequence),
-  };
-  const sortedSignDoc = sortJson(signDoc);
-  return toUtf8(JSON.stringify(sortedSignDoc));
+  return serializeSignDoc(makeStdSignDoc(msgs, fee, chainId, memo, accountNumber, sequence));
 }
diff --git a/packages/launchpad/src/index.ts b/packages/launchpad/src/index.ts
index 7cc9469504..7cf967f8f9 100644
--- a/packages/launchpad/src/index.ts
+++ b/packages/launchpad/src/index.ts
@@ -28,7 +28,7 @@ export {
   isSearchBySentFromOrToQuery,
   isSearchByTagsQuery,
 } from "./cosmosclient";
-export { makeSignBytes, StdSignDoc } from "./encoding";
+export { makeSignBytes, makeStdSignDoc, serializeSignDoc, StdSignDoc } from "./encoding";
 export { buildFeeTable, FeeTable, GasLimits, GasPrice } from "./gas";
 export {
   AuthAccountsResponse,
diff --git a/packages/launchpad/types/encoding.d.ts b/packages/launchpad/types/encoding.d.ts
index 51c2c0c4c7..bb0268626e 100644
--- a/packages/launchpad/types/encoding.d.ts
+++ b/packages/launchpad/types/encoding.d.ts
@@ -6,13 +6,23 @@ import { StdFee } from "./types";
  * @see https://docs.cosmos.network/master/modules/auth/03_types.html#stdsigndoc
  */
 export interface StdSignDoc {
-  readonly account_number: string;
   readonly chain_id: string;
-  readonly fee: StdFee;
-  readonly memo: string;
-  readonly msgs: readonly Msg[];
+  readonly account_number: string;
   readonly sequence: string;
+  readonly fee: StdFee;
+  readonly msgs: readonly Msg[];
+  readonly memo: string;
 }
+export declare function makeStdSignDoc(
+  msgs: readonly Msg[],
+  fee: StdFee,
+  chainId: string,
+  memo: string,
+  accountNumber: number | string,
+  sequence: number | string,
+): StdSignDoc;
+export declare function serializeSignDoc(signDoc: StdSignDoc): Uint8Array;
+/** A convenience helper to create the StdSignDoc and serialize it */
 export declare function makeSignBytes(
   msgs: readonly Msg[],
   fee: StdFee,
diff --git a/packages/launchpad/types/index.d.ts b/packages/launchpad/types/index.d.ts
index ed0097b2cf..6d9b9ee8c7 100644
--- a/packages/launchpad/types/index.d.ts
+++ b/packages/launchpad/types/index.d.ts
@@ -26,7 +26,7 @@ export {
   isSearchBySentFromOrToQuery,
   isSearchByTagsQuery,
 } from "./cosmosclient";
-export { makeSignBytes, StdSignDoc } from "./encoding";
+export { makeSignBytes, makeStdSignDoc, serializeSignDoc, StdSignDoc } from "./encoding";
 export { buildFeeTable, FeeTable, GasLimits, GasPrice } from "./gas";
 export {
   AuthAccountsResponse,