diff --git a/networks/cosmos/src/base/builder-context.ts b/networks/cosmos/src/base/builder-context.ts
index ce739acc..a1cb5325 100644
--- a/networks/cosmos/src/base/builder-context.ts
+++ b/networks/cosmos/src/base/builder-context.ts
@@ -1,11 +1,13 @@
-import { AuthInfo } from '@interchainjs/cosmos-types/cosmos/tx/v1beta1/tx';
-import { ITxBuilderContext } from '@interchainjs/types';
+import { BaseTxBuilderContext, ITxBuilderContext } from '@interchainjs/types';
 
 /**
  * Context for the transaction builder.
  */
 export class BaseCosmosTxBuilderContext<Signer>
+extends BaseTxBuilderContext<Signer>
 implements ITxBuilderContext<Signer>
 {
-  constructor(public signer: Signer, public authInfo?: AuthInfo) {}
+  constructor(public signer: Signer) {
+    super(signer);
+  }
 }
diff --git a/networks/cosmos/src/base/tx-builder.ts b/networks/cosmos/src/base/tx-builder.ts
index 3f758352..a305e49d 100644
--- a/networks/cosmos/src/base/tx-builder.ts
+++ b/networks/cosmos/src/base/tx-builder.ts
@@ -25,6 +25,8 @@ import { calculateFee, toFee } from '../utils';
 import { CosmosBaseSigner } from './base-signer';
 import { BaseCosmosTxBuilderContext } from './builder-context';
 
+export const STAGING_AUTH_INFO = 'staging_auth_info';
+
 /**
  * BaseCosmosSigBuilder is a helper class to build the signature from the document
  */
@@ -113,7 +115,7 @@ export abstract class BaseCosmosTxBuilder<SignDoc>
 
     const { authInfo, encode: authEncode} = await this.buildAuthInfo([signerInfo], toFee(stdFee));
 
-    this.ctx.authInfo = authInfo;
+    this.ctx.setStagingData(STAGING_AUTH_INFO, authInfo);
 
     return {
       bodyBytes: txBodyEncode(),
diff --git a/networks/cosmos/src/builder/amino-tx-builder.ts b/networks/cosmos/src/builder/amino-tx-builder.ts
index b3776a46..2e53aed5 100644
--- a/networks/cosmos/src/builder/amino-tx-builder.ts
+++ b/networks/cosmos/src/builder/amino-tx-builder.ts
@@ -1,9 +1,10 @@
 import { SignMode } from '@interchainjs/cosmos-types/cosmos/tx/signing/v1beta1/signing';
+import { AuthInfo } from '@interchainjs/cosmos-types/cosmos/tx/v1beta1/tx';
 import { TxRaw } from '@interchainjs/cosmos-types/cosmos/tx/v1beta1/tx';
 import { SignDocResponse } from '@interchainjs/types';
 
 import { type AminoSignerBase } from '../signers/amino';
-import { BaseCosmosSigBuilder, BaseCosmosTxBuilder } from '../base';
+import { BaseCosmosSigBuilder, BaseCosmosTxBuilder, STAGING_AUTH_INFO } from '../base';
 import { BaseCosmosTxBuilderContext } from '../base/builder-context';
 import { CosmosAminoDoc, CosmosSignArgs } from '../types';
 import { encodeStdSignDoc, toAminoMsgs, toFee } from '../utils';
@@ -61,8 +62,9 @@ export class AminoTxBuilder extends BaseCosmosTxBuilder<CosmosAminoDoc> {
 
   async syncSignedDoc(txRaw: TxRaw, signResp: SignDocResponse<CosmosAminoDoc>): Promise<TxRaw> {
     const authFee = toFee(signResp.signDoc.fee);
+    const authInfo = this.ctx.getStagingData<AuthInfo>(STAGING_AUTH_INFO);
 
-    const { encode: authEncode } = await this.buildAuthInfo(this.ctx.authInfo.signerInfos, authFee);
+    const { encode: authEncode } = await this.buildAuthInfo(authInfo.signerInfos, authFee);
     const authInfoBytes = authEncode();
 
     return {
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index 7d4501b4..f31cee32 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -5,3 +5,4 @@ export * from './hdpath';
 export * from './signer';
 export * from './telescope';
 export * from './wallet';
+export * from './tx-builder';
diff --git a/packages/types/src/signer.ts b/packages/types/src/signer.ts
index b7ccc0ed..2b0f495d 100644
--- a/packages/types/src/signer.ts
+++ b/packages/types/src/signer.ts
@@ -107,30 +107,6 @@ export interface SignResponse<Tx, Doc, BroadcastResponse = { hash: string }>
   broadcast: (options?: BroadcastOptions) => Promise<BroadcastResponse>;
 }
 
-/**
- * ISigBuilder is an interface for building signature from document.
- */
-export interface ISigBuilder<Doc = unknown, Sig = unknown> {
-  /**
-   * build signature from document.
-   */
-  buildSignature(doc: Doc): Sig | Promise<Sig>;
-}
-
-/**
- * ITxBuilder is an interface for building signed transaction document.
- */
-export interface ITxBuilder<SignArgs = unknown, SignResp = unknown> {
-  buildSignedTxDoc(args: SignArgs): Promise<SignResp>;
-}
-
-/**
- * ITxBuilderContext is a context object for building transaction document.
- */
-export interface ITxBuilderContext<Signer = unknown> {
-  signer?: Signer;
-}
-
 /**
  * IDocSigner is an interface for signing document.
  * @template TDoc - document type
diff --git a/packages/types/src/tx-builder.ts b/packages/types/src/tx-builder.ts
new file mode 100644
index 00000000..0b3b0c53
--- /dev/null
+++ b/packages/types/src/tx-builder.ts
@@ -0,0 +1,51 @@
+/**
+ * ISigBuilder is an interface for building signature from document.
+ */
+export interface ISigBuilder<Doc = unknown, Sig = unknown> {
+  /**
+   * build signature from document.
+   */
+  buildSignature(doc: Doc): Sig | Promise<Sig>;
+}
+
+/**
+ * ITxBuilder is an interface for building signed transaction document.
+ */
+export interface ITxBuilder<SignArgs = unknown, SignResp = unknown> {
+  buildSignedTxDoc(args: SignArgs): Promise<SignResp>;
+}
+
+/**
+ * ITxBuilderContext is a context object for building transaction document.
+ */
+export interface ITxBuilderContext<Signer = unknown> {
+  signer?: Signer;
+
+  /**
+   * set staging data.
+   * @param data - staging data
+   */
+  setStagingData(key: string, data: unknown): void;
+
+  /**
+   * get staging data.
+   */
+  getStagingData<TStaging>(key: string): TStaging;
+}
+
+/**
+ * BaseTxBuilderContext is a base class for ITxBuilderContext.
+ */
+export class BaseTxBuilderContext<Signer> implements ITxBuilderContext<Signer> {
+  private stagingData: Record<string, unknown> = {};
+
+  constructor(public signer?: Signer) {}
+
+  setStagingData(key: string, data: unknown): void {
+    this.stagingData[key] = data;
+  }
+
+  getStagingData<TStaging>(key: string): TStaging {
+    return this.stagingData[key] as TStaging;
+  }
+}
\ No newline at end of file