diff --git a/packages/stargate/src/queryclient.ts b/packages/stargate/src/queryclient.ts
new file mode 100644
index 00000000..fedc9a0f
--- /dev/null
+++ b/packages/stargate/src/queryclient.ts
@@ -0,0 +1,183 @@
+/* eslint-disable no-dupe-class-members, @typescript-eslint/ban-types, @typescript-eslint/naming-convention */
+import { toHex } from "@cosmjs/encoding";
+import { Client as TendermintClient } from "@cosmjs/tendermint-rpc";
+import { arrayContentEquals, assert, isNonNullObject } from "@cosmjs/utils";
+
+type QueryExtensionSetup<P> = (base: QueryClient) => P;
+
+export class QueryClient {
+  /** Constructs a QueryClient with 0 extensions */
+  public static withExtensions(tmClient: TendermintClient): QueryClient;
+
+  /** Constructs a QueryClient with 1 extension */
+  public static withExtensions<A extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+  ): QueryClient & A;
+
+  /** Constructs a QueryClient with 2 extensions */
+  public static withExtensions<A extends object, B extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+  ): QueryClient & A & B;
+
+  /** Constructs a QueryClient with 3 extensions */
+  public static withExtensions<A extends object, B extends object, C extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+  ): QueryClient & A & B & C;
+
+  /** Constructs a QueryClient with 4 extensions */
+  public static withExtensions<A extends object, B extends object, C extends object, D extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+  ): QueryClient & A & B & C & D;
+
+  /** Constructs a QueryClient with 5 extensions */
+  public static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+  ): QueryClient & A & B & C & D & E;
+
+  /** Constructs a QueryClient with 6 extensions */
+  public static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+  ): QueryClient & A & B & C & D & E & F;
+
+  /** Constructs a QueryClient with 7 extensions */
+  public static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object,
+    G extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+    setupExtensionG: QueryExtensionSetup<G>,
+  ): QueryClient & A & B & C & D & E & F & G;
+
+  /** Constructs a QueryClient with 8 extensions */
+  public static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object,
+    G extends object,
+    H extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+    setupExtensionG: QueryExtensionSetup<G>,
+    setupExtensionH: QueryExtensionSetup<H>,
+  ): QueryClient & A & B & C & D & E & F & G & H;
+
+  public static withExtensions(
+    tmClient: TendermintClient,
+    ...extensionSetups: Array<QueryExtensionSetup<object>>
+  ): any {
+    const client = new QueryClient(tmClient);
+    const extensions = extensionSetups.map((setupExtension) => setupExtension(client));
+    for (const extension of extensions) {
+      assert(isNonNullObject(extension), `Extension must be a non-null object`);
+      for (const [moduleKey, moduleValue] of Object.entries(extension)) {
+        assert(
+          isNonNullObject(moduleValue),
+          `Module must be a non-null object. Found type ${typeof moduleValue} for module "${moduleKey}".`,
+        );
+        const current = (client as any)[moduleKey] || {};
+        (client as any)[moduleKey] = {
+          ...current,
+          ...moduleValue,
+        };
+      }
+    }
+    return client;
+  }
+
+  private readonly tmClient: TendermintClient;
+
+  public constructor(tmClient: TendermintClient) {
+    this.tmClient = tmClient;
+  }
+
+  public async queryVerified(store: string, key: Uint8Array): Promise<Uint8Array> {
+    const response = await this.tmClient.abciQuery({
+      // we need the StoreKey for the module, not the module name
+      // https://github.com/cosmos/cosmos-sdk/blob/8cab43c8120fec5200c3459cbf4a92017bb6f287/x/auth/types/keys.go#L12
+      path: `/store/${store}/key`,
+      data: key,
+      prove: true,
+    });
+
+    if (response.code) {
+      throw new Error(`Query failed with (${response.code}): ${response.log}`);
+    }
+
+    if (!arrayContentEquals(response.key, key)) {
+      throw new Error(`Response key ${toHex(response.key)} doesn't match query key ${toHex(key)}`);
+    }
+
+    // TODO: implement proof verification
+    // https://github.com/CosmWasm/cosmjs/issues/347
+
+    return response.value;
+  }
+
+  public async queryUnverified(path: string, request: Uint8Array): Promise<Uint8Array> {
+    const response = await this.tmClient.abciQuery({
+      path: path,
+      data: request,
+      prove: false,
+    });
+
+    if (response.code) {
+      throw new Error(`Query failed with (${response.code}): ${response.log}`);
+    }
+
+    return response.value;
+  }
+}
diff --git a/packages/stargate/src/stargateclient.ts b/packages/stargate/src/stargateclient.ts
index 75b18ec9..566c0602 100644
--- a/packages/stargate/src/stargateclient.ts
+++ b/packages/stargate/src/stargateclient.ts
@@ -13,10 +13,11 @@ import {
 import { Uint53, Uint64 } from "@cosmjs/math";
 import { decodeAny } from "@cosmjs/proto-signing";
 import { broadcastTxCommitSuccess, Client as TendermintClient, QueryString } from "@cosmjs/tendermint-rpc";
-import { arrayContentEquals, assert, assertDefined } from "@cosmjs/utils";
+import { assert, assertDefined } from "@cosmjs/utils";
 import Long from "long";
 
 import { cosmos } from "./generated/codecimpl";
+import { QueryClient } from "./queryclient";
 
 /** A transaction that is indexed as part of the transaction history */
 export interface IndexedTx {
@@ -114,6 +115,7 @@ export interface PrivateStargateClient {
 
 export class StargateClient {
   private readonly tmClient: TendermintClient;
+  private readonly queryClient: QueryClient;
   private chainId: string | undefined;
 
   public static async connect(endpoint: string): Promise<StargateClient> {
@@ -123,6 +125,7 @@ export class StargateClient {
 
   private constructor(tmClient: TendermintClient) {
     this.tmClient = tmClient;
+    this.queryClient = QueryClient.withExtensions(tmClient);
   }
 
   public async getChainId(): Promise<string> {
@@ -145,7 +148,7 @@ export class StargateClient {
     const { prefix, data: binAddress } = Bech32.decode(searchAddress);
     // https://github.com/cosmos/cosmos-sdk/blob/8cab43c8120fec5200c3459cbf4a92017bb6f287/x/auth/types/keys.go#L29-L32
     const accountKey = Uint8Array.from([0x01, ...binAddress]);
-    const responseData = await this.queryVerified("acc", accountKey);
+    const responseData = await this.queryClient.queryVerified("acc", accountKey);
 
     if (responseData.length === 0) return null;
 
@@ -198,7 +201,7 @@ export class StargateClient {
     const binAddress = Bech32.decode(address).data;
     const bankKey = Uint8Array.from([...toAscii("balances"), ...binAddress, ...toAscii(searchDenom)]);
 
-    const responseData = await this.queryVerified("bank", bankKey);
+    const responseData = await this.queryClient.queryVerified("bank", bankKey);
     const { amount, denom } = cosmos.Coin.decode(responseData);
     if (denom === "") {
       return null;
@@ -221,7 +224,7 @@ export class StargateClient {
     const request = cosmos.bank.QueryAllBalancesRequest.encode({
       address: Bech32.decode(address).data,
     }).finish();
-    const responseData = await this.queryUnverified(path, request);
+    const responseData = await this.queryClient.queryUnverified(path, request);
     const response = cosmos.bank.QueryAllBalancesResponse.decode(responseData);
     return response.balances.map(coinFromProto);
   }
@@ -280,43 +283,6 @@ export class StargateClient {
         };
   }
 
-  private async queryVerified(store: string, key: Uint8Array): Promise<Uint8Array> {
-    const response = await this.tmClient.abciQuery({
-      // we need the StoreKey for the module, not the module name
-      // https://github.com/cosmos/cosmos-sdk/blob/8cab43c8120fec5200c3459cbf4a92017bb6f287/x/auth/types/keys.go#L12
-      path: `/store/${store}/key`,
-      data: key,
-      prove: true,
-    });
-
-    if (response.code) {
-      throw new Error(`Query failed with (${response.code}): ${response.log}`);
-    }
-
-    if (!arrayContentEquals(response.key, key)) {
-      throw new Error(`Response key ${toHex(response.key)} doesn't match query key ${toHex(key)}`);
-    }
-
-    // TODO: implement proof verification
-    // https://github.com/CosmWasm/cosmjs/issues/347
-
-    return response.value;
-  }
-
-  private async queryUnverified(path: string, request: Uint8Array): Promise<Uint8Array> {
-    const response = await this.tmClient.abciQuery({
-      path: path,
-      data: request,
-      prove: false,
-    });
-
-    if (response.code) {
-      throw new Error(`Query failed with (${response.code}): ${response.log}`);
-    }
-
-    return response.value;
-  }
-
   private async txsQuery(query: string): Promise<readonly IndexedTx[]> {
     const params = {
       query: query as QueryString,
diff --git a/packages/stargate/types/queryclient.d.ts b/packages/stargate/types/queryclient.d.ts
new file mode 100644
index 00000000..c00db57b
--- /dev/null
+++ b/packages/stargate/types/queryclient.d.ts
@@ -0,0 +1,109 @@
+import { Client as TendermintClient } from "@cosmjs/tendermint-rpc";
+declare type QueryExtensionSetup<P> = (base: QueryClient) => P;
+export declare class QueryClient {
+  /** Constructs a QueryClient with 0 extensions */
+  static withExtensions(tmClient: TendermintClient): QueryClient;
+  /** Constructs a QueryClient with 1 extension */
+  static withExtensions<A extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+  ): QueryClient & A;
+  /** Constructs a QueryClient with 2 extensions */
+  static withExtensions<A extends object, B extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+  ): QueryClient & A & B;
+  /** Constructs a QueryClient with 3 extensions */
+  static withExtensions<A extends object, B extends object, C extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+  ): QueryClient & A & B & C;
+  /** Constructs a QueryClient with 4 extensions */
+  static withExtensions<A extends object, B extends object, C extends object, D extends object>(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+  ): QueryClient & A & B & C & D;
+  /** Constructs a QueryClient with 5 extensions */
+  static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+  ): QueryClient & A & B & C & D & E;
+  /** Constructs a QueryClient with 6 extensions */
+  static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+  ): QueryClient & A & B & C & D & E & F;
+  /** Constructs a QueryClient with 7 extensions */
+  static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object,
+    G extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+    setupExtensionG: QueryExtensionSetup<G>,
+  ): QueryClient & A & B & C & D & E & F & G;
+  /** Constructs a QueryClient with 8 extensions */
+  static withExtensions<
+    A extends object,
+    B extends object,
+    C extends object,
+    D extends object,
+    E extends object,
+    F extends object,
+    G extends object,
+    H extends object
+  >(
+    tmClient: TendermintClient,
+    setupExtensionA: QueryExtensionSetup<A>,
+    setupExtensionB: QueryExtensionSetup<B>,
+    setupExtensionC: QueryExtensionSetup<C>,
+    setupExtensionD: QueryExtensionSetup<D>,
+    setupExtensionE: QueryExtensionSetup<E>,
+    setupExtensionF: QueryExtensionSetup<F>,
+    setupExtensionG: QueryExtensionSetup<G>,
+    setupExtensionH: QueryExtensionSetup<H>,
+  ): QueryClient & A & B & C & D & E & F & G & H;
+  private readonly tmClient;
+  constructor(tmClient: TendermintClient);
+  queryVerified(store: string, key: Uint8Array): Promise<Uint8Array>;
+  queryUnverified(path: string, request: Uint8Array): Promise<Uint8Array>;
+}
+export {};
diff --git a/packages/stargate/types/stargateclient.d.ts b/packages/stargate/types/stargateclient.d.ts
index d641352f..b8c8e460 100644
--- a/packages/stargate/types/stargateclient.d.ts
+++ b/packages/stargate/types/stargateclient.d.ts
@@ -49,6 +49,7 @@ export interface PrivateStargateClient {
 }
 export declare class StargateClient {
   private readonly tmClient;
+  private readonly queryClient;
   private chainId;
   static connect(endpoint: string): Promise<StargateClient>;
   private constructor();
@@ -68,7 +69,5 @@ export declare class StargateClient {
   searchTx(query: SearchTxQuery, filter?: SearchTxFilter): Promise<readonly IndexedTx[]>;
   disconnect(): void;
   broadcastTx(tx: Uint8Array): Promise<BroadcastTxResponse>;
-  private queryVerified;
-  private queryUnverified;
   private txsQuery;
 }