diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6db38764..dc5e761d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to
 ## [Unreleased]
 
 ### Added
+- [\#71](https://github.com/line/lbmjs/pull/71) @lbmjs/finschia: Add custom GetBlockWithTxs for lbm
 
 ### Changed
 
diff --git a/packages/finschia/src/finschiaclient.ts b/packages/finschia/src/finschiaclient.ts
index 32c58ac9..cec74492 100644
--- a/packages/finschia/src/finschiaclient.ts
+++ b/packages/finschia/src/finschiaclient.ts
@@ -37,11 +37,9 @@ import {
   setupMintExtension,
   setupSlashingExtension,
   setupStakingExtension,
-  setupTxExtension,
   StakingExtension,
   StargateClientOptions,
   TimeoutError,
-  TxExtension,
 } from "@cosmjs/stargate";
 import { SlashingExtension } from "@cosmjs/stargate/build/modules";
 import { AuthzExtension } from "@cosmjs/stargate/build/modules/authz/queries";
@@ -71,8 +69,10 @@ import {
   setupIbcExtension,
   setupNodeExtension,
   setupTokenExtension,
+  setupTx2Extension,
   setupWasmplusExtension,
   TokenExtension,
+  Tx2Extension,
   WasmplusExtension,
 } from "./modules";
 
@@ -91,7 +91,7 @@ export type QueryClientWithExtensions = QueryClient &
   MintExtension &
   StakingExtension &
   TokenExtension &
-  TxExtension &
+  Tx2Extension &
   WasmExtension &
   WasmplusExtension &
   NodeExtension;
@@ -113,7 +113,7 @@ function createQueryClientWithExtensions(tmClient: Tendermint34Client): QueryCli
     setupMintExtension,
     setupStakingExtension,
     setupTokenExtension,
-    setupTxExtension,
+    setupTx2Extension,
     setupWasmExtension,
     setupWasmplusExtension,
     setupNodeExtension,
diff --git a/packages/finschia/src/index.ts b/packages/finschia/src/index.ts
index ecaedfae..306e4e72 100644
--- a/packages/finschia/src/index.ts
+++ b/packages/finschia/src/index.ts
@@ -130,6 +130,7 @@ export {
   WasmplusExtension,
   wasmTypes,
 } from "./modules";
+export { setupTx2Extension, Tx2Extension } from "./modules";
 export { makeLinkPath } from "./paths";
 export { SigningFinschiaClient, UploadAndInstantiateResult } from "./signingfinschiaclient";
 export { finschiaRegistryTypes } from "./types";
diff --git a/packages/finschia/src/modules/index.ts b/packages/finschia/src/modules/index.ts
index 037cea80..cec91b09 100644
--- a/packages/finschia/src/modules/index.ts
+++ b/packages/finschia/src/modules/index.ts
@@ -120,6 +120,7 @@ export {
   tokenTypes,
 } from "./token/messages";
 export { setupTokenExtension, TokenExtension } from "./token/queries";
+export { setupTx2Extension, Tx2Extension } from "./tx2/queries";
 export { wasmTypes } from "./wasm/messages";
 export { createWasmplusAminoConverters } from "./wasmplus/aminomessages";
 export {
diff --git a/packages/finschia/src/modules/tx2/queries.spec.ts b/packages/finschia/src/modules/tx2/queries.spec.ts
new file mode 100644
index 00000000..016c8140
--- /dev/null
+++ b/packages/finschia/src/modules/tx2/queries.spec.ts
@@ -0,0 +1,73 @@
+import { DirectSecp256k1HdWallet } from "@cosmjs/proto-signing";
+import { coins, MsgSendEncodeObject, QueryClient } from "@cosmjs/stargate";
+import { Tendermint34Client } from "@cosmjs/tendermint-rpc";
+import { MsgSend } from "cosmjs-types/cosmos/bank/v1beta1/tx";
+import { TxRaw } from "cosmjs-types/cosmos/tx/v1beta1/tx";
+
+import { makeLinkPath } from "../../paths";
+import { SigningFinschiaClient } from "../../signingfinschiaclient";
+import {
+  defaultSigningClientOptions,
+  faucet,
+  makeRandomAddress,
+  pendingWithoutSimapp,
+  simapp,
+} from "../../testutils.spec";
+import { longify } from "../../utils";
+import { setupTx2Extension, Tx2Extension } from "./queries";
+
+async function makeClientWithTx2(rpcUrl: string): Promise<[QueryClient & Tx2Extension, Tendermint34Client]> {
+  const tmClient = await Tendermint34Client.connect(rpcUrl);
+  return [QueryClient.withExtensions(tmClient, setupTx2Extension), tmClient];
+}
+
+async function sendDummyTx() {
+  const wallet = await DirectSecp256k1HdWallet.fromMnemonic(faucet.mnemonic, {
+    hdPaths: [makeLinkPath(0)],
+    prefix: simapp.prefix,
+  });
+  const client = await SigningFinschiaClient.connectWithSigner(
+    simapp.tendermintUrl,
+    wallet,
+    defaultSigningClientOptions,
+  );
+  const defaultFee = {
+    amount: coins(250000, simapp.denomFee),
+    gas: "1500000",
+  };
+  const msg: MsgSend = {
+    fromAddress: faucet.address0,
+    toAddress: makeRandomAddress(),
+    amount: coins(1234, simapp.denomFee),
+  };
+  const dummyMsg: MsgSendEncodeObject = {
+    typeUrl: "/cosmos.bank.v1beta1.MsgSend",
+    value: msg,
+  };
+  const signed = await client.sign(faucet.address0, [dummyMsg], defaultFee, "");
+  return await client.broadcastTx(Uint8Array.from(TxRaw.encode(signed).finish()));
+}
+
+describe("Tx2Extension", () => {
+  let client: QueryClient & Tx2Extension;
+  let tmClient: Tendermint34Client;
+  beforeAll(async () => {
+    const res = await makeClientWithTx2(simapp.tendermintUrl);
+    client = res[0];
+    tmClient = res[1];
+  });
+  afterAll(() => {
+    tmClient.disconnect();
+  });
+
+  it("getBlockWithTxs", async () => {
+    pendingWithoutSimapp();
+
+    const txRes = await sendDummyTx();
+    const response = await client.tx2.getBlockWithTxs(longify(txRes.height));
+
+    expect(response.txs).toBeDefined();
+    expect(response.blockId).toBeDefined();
+    expect(response.block).toBeDefined();
+  });
+});
diff --git a/packages/finschia/src/modules/tx2/queries.ts b/packages/finschia/src/modules/tx2/queries.ts
new file mode 100644
index 00000000..2cc71711
--- /dev/null
+++ b/packages/finschia/src/modules/tx2/queries.ts
@@ -0,0 +1,34 @@
+import {
+  createPagination,
+  createProtobufRpcClient,
+  QueryClient,
+  setupTxExtension,
+  TxExtension,
+} from "@cosmjs/stargate";
+import { GetBlockWithTxsResponse, ServiceClientImpl } from "lbmjs-types/lbm/tx/v1beta1/service";
+import Long from "long";
+
+export interface Tx2Extension extends TxExtension {
+  readonly tx2: {
+    readonly getBlockWithTxs: (height: Long, paginationKey?: Uint8Array) => Promise<GetBlockWithTxsResponse>;
+  };
+}
+
+export function setupTx2Extension(base: QueryClient): Tx2Extension {
+  const txExtension = setupTxExtension(base);
+  const rpc = createProtobufRpcClient(base);
+
+  // GetBlockWithTxs(request: GetBlockWithTxsRequest): Promise<GetBlockWithTxsResponse>;
+  const queryService = new ServiceClientImpl(rpc);
+  return {
+    tx: txExtension.tx,
+    tx2: {
+      getBlockWithTxs: async (height: Long, paginationKey?: Uint8Array) => {
+        return await queryService.GetBlockWithTxs({
+          height: height,
+          pagination: createPagination(paginationKey),
+        });
+      },
+    },
+  };
+}