diff --git a/packages/sdk38/src/lcdclient.spec.ts b/packages/sdk38/src/lcdclient.spec.ts
new file mode 100644
index 00000000..c0eee65e
--- /dev/null
+++ b/packages/sdk38/src/lcdclient.spec.ts
@@ -0,0 +1,869 @@
+/* eslint-disable @typescript-eslint/camelcase */
+import { assert, sleep } from "@cosmjs/utils";
+
+import { rawSecp256k1PubkeyToAddress } from "./address";
+import { Coin } from "./coins";
+import { isPostTxFailure } from "./cosmosclient";
+import { makeSignBytes } from "./encoding";
+import { CosmosSdkArray, LcdClient, normalizeArray } from "./lcdclient";
+import { parseLogs } from "./logs";
+import { Msg, MsgSend } from "./msgs";
+import { makeCosmoshubPath, Secp256k1Pen } from "./pen";
+import { BroadcastMode, TxsResponse } from "./restclient";
+import { SigningCosmosClient } from "./signingcosmosclient";
+import cosmoshub from "./testdata/cosmoshub.json";
+import {
+  faucet,
+  makeRandomAddress,
+  nonNegativeIntegerMatcher,
+  pendingWithoutWasmd,
+  tendermintIdMatcher,
+  wasmd,
+  wasmdEnabled,
+} from "./testutils.spec";
+import { StdFee, StdSignature, StdTx } from "./types";
+
+const emptyAddress = "cosmos1ltkhnmdcqemmd2tkhnx7qx66tq7e0wykw2j85k";
+
+/** Deployed as part of scripts/wasmd/init.sh */
+export const deployedErc20 = {
+  codeId: 1,
+  source: "https://crates.io/api/v1/crates/cw-erc20/0.5.1/download",
+  builder: "cosmwasm/rust-optimizer:0.8.0",
+  checksum: "3e97bf88bd960fee5e5959c77b972eb2927690bc10160792741b174f105ec0c5",
+  instances: [
+    "cosmos18vd8fpwxzck93qlwghaj6arh4p7c5n89uzcee5", // HASH
+    "cosmos1hqrdl6wstt8qzshwc6mrumpjk9338k0lr4dqxd", // ISA
+    "cosmos18r5szma8hm93pvx6lwpjwyxruw27e0k5uw835c", // JADE
+  ],
+};
+
+function makeSignedTx(firstMsg: Msg, fee: StdFee, memo: string, firstSignature: StdSignature): StdTx {
+  return {
+    msg: [firstMsg],
+    fee: fee,
+    memo: memo,
+    signatures: [firstSignature],
+  };
+}
+
+describe("LcdClient", () => {
+  it("can be constructed", () => {
+    const client = new LcdClient(wasmd.endpoint);
+    expect(client).toBeTruthy();
+  });
+
+  describe("withModules", () => {
+    interface CodeInfo {
+      readonly id: number;
+      /** Bech32 account address */
+      readonly creator: string;
+      /** Hex-encoded sha256 hash of the code stored here */
+      readonly data_hash: string;
+      readonly source?: string;
+      readonly builder?: string;
+    }
+
+    // Currently all wasm query responses return json-encoded strings...
+    // later deprecate this and use the specific types for result
+    // (assuming it is inlined, no second parse needed)
+    type WasmResponse<T = string> = WasmSuccess<T> | WasmError;
+
+    interface WasmSuccess<T = string> {
+      readonly height: string;
+      readonly result: T;
+    }
+
+    interface WasmError {
+      readonly error: string;
+    }
+
+    function isWasmError<T>(resp: WasmResponse<T>): resp is WasmError {
+      return (resp as WasmError).error !== undefined;
+    }
+
+    function unwrapWasmResponse<T>(response: WasmResponse<T>): T {
+      if (isWasmError(response)) {
+        throw new Error(response.error);
+      }
+      return response.result;
+    }
+
+    interface WasmModule extends Record<string, () => any> {
+      listCodeInfo: () => Promise<readonly CodeInfo[]>;
+    }
+
+    it("works for no modules", async () => {
+      const client = LcdClient.withModules(wasmd.endpoint, BroadcastMode.Sync);
+      expect(client).toBeTruthy();
+    });
+
+    it("works for one module", async () => {
+      pendingWithoutWasmd();
+      function wasmClientRegisterer(base: LcdClient): WasmModule {
+        return {
+          listCodeInfo: async (): Promise<readonly CodeInfo[]> => {
+            const path = `/wasm/code`;
+            const responseData = (await base.get(path)) as WasmResponse<CosmosSdkArray<CodeInfo>>;
+            return normalizeArray(unwrapWasmResponse(responseData));
+          },
+        };
+      }
+
+      const client = LcdClient.withModules(wasmd.endpoint, BroadcastMode.Sync, wasmClientRegisterer);
+      const codes = await client.listCodeInfo();
+      expect(codes.length).toBeGreaterThanOrEqual(3);
+      expect(codes[0].id).toEqual(deployedErc20.codeId);
+      expect(codes[0].data_hash).toEqual(deployedErc20.checksum.toUpperCase());
+      expect(codes[0].builder).toEqual(deployedErc20.builder);
+      expect(codes[0].source).toEqual(deployedErc20.source);
+    });
+
+    it("works for two modules", async () => {
+      pendingWithoutWasmd();
+      function registerWasmModule(base: LcdClient): WasmModule {
+        return {
+          listCodeInfo: async (): Promise<readonly CodeInfo[]> => {
+            const path = `/wasm/code`;
+            const responseData = (await base.get(path)) as WasmResponse<CosmosSdkArray<CodeInfo>>;
+            return normalizeArray(unwrapWasmResponse(responseData));
+          },
+        };
+      }
+
+      interface TotalSupplyReponse {
+        readonly height: string;
+        readonly result: CosmosSdkArray<Coin>;
+      }
+
+      // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
+      function registerSupplyModule(base: LcdClient) {
+        return {
+          totalSupply: async (): Promise<TotalSupplyReponse> => {
+            const path = `/supply/total`;
+            return (await base.get(path)) as TotalSupplyReponse;
+          },
+        };
+      }
+
+      const client = LcdClient.withModules(
+        wasmd.endpoint,
+        BroadcastMode.Sync,
+        registerWasmModule,
+        registerSupplyModule,
+      );
+      const codes = await client.listCodeInfo();
+      expect(codes.length).toBeGreaterThanOrEqual(3);
+      expect(codes[0].id).toEqual(deployedErc20.codeId);
+      expect(codes[0].data_hash).toEqual(deployedErc20.checksum.toUpperCase());
+      expect(codes[0].builder).toEqual(deployedErc20.builder);
+      expect(codes[0].source).toEqual(deployedErc20.source);
+      const supply = await client.totalSupply();
+      expect(supply).toEqual({
+        height: jasmine.stringMatching(/^[0-9]+$/),
+        result: [
+          {
+            amount: jasmine.stringMatching(/^[0-9]+$/),
+            denom: "ucosm",
+          },
+          {
+            amount: jasmine.stringMatching(/^[0-9]+$/),
+            denom: "ustake",
+          },
+        ],
+      });
+    });
+  });
+
+  // The /txs endpoints
+
+  describe("txById", () => {
+    let successful:
+      | {
+          readonly sender: string;
+          readonly recipient: string;
+          readonly hash: string;
+        }
+      | undefined;
+    let unsuccessful:
+      | {
+          readonly sender: string;
+          readonly recipient: string;
+          readonly hash: string;
+        }
+      | undefined;
+
+    beforeAll(async () => {
+      if (wasmdEnabled()) {
+        const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
+        const client = new SigningCosmosClient(wasmd.endpoint, faucet.address, (signBytes) =>
+          pen.sign(signBytes),
+        );
+
+        {
+          const recipient = makeRandomAddress();
+          const transferAmount = {
+            denom: "ucosm",
+            amount: "1234567",
+          };
+          const result = await client.sendTokens(recipient, [transferAmount]);
+          successful = {
+            sender: faucet.address,
+            recipient: recipient,
+            hash: result.transactionHash,
+          };
+        }
+
+        {
+          const memo = "Sending more than I can afford";
+          const recipient = makeRandomAddress();
+          const transferAmount = [
+            {
+              denom: "ucosm",
+              amount: "123456700000000",
+            },
+          ];
+          const sendMsg: MsgSend = {
+            type: "cosmos-sdk/MsgSend",
+            value: {
+              // eslint-disable-next-line @typescript-eslint/camelcase
+              from_address: faucet.address,
+              // eslint-disable-next-line @typescript-eslint/camelcase
+              to_address: recipient,
+              amount: transferAmount,
+            },
+          };
+          const fee = {
+            amount: [
+              {
+                denom: "ucosm",
+                amount: "2000",
+              },
+            ],
+            gas: "80000", // 80k
+          };
+          const { accountNumber, sequence } = await client.getNonce();
+          const chainId = await client.getChainId();
+          const signBytes = makeSignBytes([sendMsg], fee, chainId, memo, accountNumber, sequence);
+          const signature = await pen.sign(signBytes);
+          const signedTx = {
+            msg: [sendMsg],
+            fee: fee,
+            memo: memo,
+            signatures: [signature],
+          };
+          const transactionId = await client.getIdentifier({ type: "cosmos-sdk/StdTx", value: signedTx });
+          const result = await client.postTx(signedTx);
+          assert(isPostTxFailure(result));
+          unsuccessful = {
+            sender: faucet.address,
+            recipient: recipient,
+            hash: transactionId,
+          };
+        }
+
+        await sleep(75); // wait until transactions are indexed
+      }
+    });
+
+    it("works for successful transaction", async () => {
+      pendingWithoutWasmd();
+      assert(successful);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txById(successful.hash);
+      expect(result.height).toBeGreaterThanOrEqual(1);
+      expect(result.txhash).toEqual(successful.hash);
+      expect(result.codespace).toBeUndefined();
+      expect(result.code).toBeUndefined();
+      const logs = parseLogs(result.logs);
+      expect(logs).toEqual([
+        {
+          msg_index: 0,
+          log: "",
+          events: [
+            {
+              type: "message",
+              attributes: [
+                { key: "action", value: "send" },
+                { key: "sender", value: successful.sender },
+                { key: "module", value: "bank" },
+              ],
+            },
+            {
+              type: "transfer",
+              attributes: [
+                { key: "recipient", value: successful.recipient },
+                { key: "sender", value: successful.sender },
+                { key: "amount", value: "1234567ucosm" },
+              ],
+            },
+          ],
+        },
+      ]);
+    });
+
+    it("works for unsuccessful transaction", async () => {
+      pendingWithoutWasmd();
+      assert(unsuccessful);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txById(unsuccessful.hash);
+      expect(result.height).toBeGreaterThanOrEqual(1);
+      expect(result.txhash).toEqual(unsuccessful.hash);
+      expect(result.codespace).toEqual("sdk");
+      expect(result.code).toEqual(5);
+      expect(result.logs).toBeUndefined();
+      expect(result.raw_log).toContain("insufficient funds");
+    });
+  });
+
+  describe("txsQuery", () => {
+    let posted:
+      | {
+          readonly sender: string;
+          readonly recipient: string;
+          readonly hash: string;
+          readonly height: number;
+          readonly tx: TxsResponse;
+        }
+      | undefined;
+
+    beforeAll(async () => {
+      if (wasmdEnabled()) {
+        const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
+        const client = new SigningCosmosClient(wasmd.endpoint, faucet.address, (signBytes) =>
+          pen.sign(signBytes),
+        );
+
+        const recipient = makeRandomAddress();
+        const transferAmount = [
+          {
+            denom: "ucosm",
+            amount: "1234567",
+          },
+        ];
+        const result = await client.sendTokens(recipient, transferAmount);
+
+        await sleep(75); // wait until tx is indexed
+        const txDetails = await new LcdClient(wasmd.endpoint).txById(result.transactionHash);
+        posted = {
+          sender: faucet.address,
+          recipient: recipient,
+          hash: result.transactionHash,
+          height: Number.parseInt(txDetails.height, 10),
+          tx: txDetails,
+        };
+      }
+    });
+
+    it("can query transactions by height", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txsQuery(`tx.height=${posted.height}&limit=26`);
+      expect(result).toEqual({
+        count: jasmine.stringMatching(/^(1|2|3|4|5)$/), // 1-5 transactions as string
+        limit: "26",
+        page_number: "1",
+        page_total: "1",
+        total_count: jasmine.stringMatching(/^(1|2|3|4|5)$/), // 1-5 transactions as string
+        txs: jasmine.arrayContaining([posted.tx]),
+      });
+    });
+
+    it("can query transactions by ID", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txsQuery(`tx.hash=${posted.hash}&limit=26`);
+      expect(result).toEqual({
+        count: "1",
+        limit: "26",
+        page_number: "1",
+        page_total: "1",
+        total_count: "1",
+        txs: [posted.tx],
+      });
+    });
+
+    it("can query transactions by sender", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txsQuery(`message.sender=${posted.sender}&limit=200`);
+      expect(parseInt(result.count, 10)).toBeGreaterThanOrEqual(1);
+      expect(parseInt(result.limit, 10)).toEqual(200);
+      expect(parseInt(result.page_number, 10)).toEqual(1);
+      expect(parseInt(result.page_total, 10)).toEqual(1);
+      expect(parseInt(result.total_count, 10)).toBeGreaterThanOrEqual(1);
+      expect(result.txs.length).toBeGreaterThanOrEqual(1);
+      expect(result.txs[result.txs.length - 1]).toEqual(posted.tx);
+    });
+
+    it("can query transactions by recipient", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const result = await client.txsQuery(`transfer.recipient=${posted.recipient}&limit=200`);
+      expect(parseInt(result.count, 10)).toEqual(1);
+      expect(parseInt(result.limit, 10)).toEqual(200);
+      expect(parseInt(result.page_number, 10)).toEqual(1);
+      expect(parseInt(result.page_total, 10)).toEqual(1);
+      expect(parseInt(result.total_count, 10)).toEqual(1);
+      expect(result.txs.length).toBeGreaterThanOrEqual(1);
+      expect(result.txs[result.txs.length - 1]).toEqual(posted.tx);
+    });
+
+    it("can filter by tx.hash and tx.minheight", async () => {
+      pending("This combination is broken 🤷‍♂️. Handle client-side at higher level.");
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const hashQuery = `tx.hash=${posted.hash}`;
+
+      {
+        const { count } = await client.txsQuery(`${hashQuery}&tx.minheight=0`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${hashQuery}&tx.minheight=${posted.height - 1}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${hashQuery}&tx.minheight=${posted.height}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${hashQuery}&tx.minheight=${posted.height + 1}`);
+        expect(count).toEqual("0");
+      }
+    });
+
+    it("can filter by recipient and tx.minheight", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const recipientQuery = `transfer.recipient=${posted.recipient}`;
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.minheight=0`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.minheight=${posted.height - 1}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.minheight=${posted.height}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.minheight=${posted.height + 1}`);
+        expect(count).toEqual("0");
+      }
+    });
+
+    it("can filter by recipient and tx.maxheight", async () => {
+      pendingWithoutWasmd();
+      assert(posted);
+      const client = new LcdClient(wasmd.endpoint);
+      const recipientQuery = `transfer.recipient=${posted.recipient}`;
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.maxheight=9999999999999`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.maxheight=${posted.height + 1}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.maxheight=${posted.height}`);
+        expect(count).toEqual("1");
+      }
+
+      {
+        const { count } = await client.txsQuery(`${recipientQuery}&tx.maxheight=${posted.height - 1}`);
+        expect(count).toEqual("0");
+      }
+    });
+  });
+
+  describe("encodeTx", () => {
+    it("works for cosmoshub example", async () => {
+      pendingWithoutWasmd();
+      const client = new LcdClient(wasmd.endpoint);
+      const response = await client.encodeTx(cosmoshub.tx);
+      expect(response).toEqual(
+        jasmine.objectContaining({
+          tx: cosmoshub.tx_data,
+        }),
+      );
+    });
+  });
+
+  describe("postTx", () => {
+    it("can send tokens", async () => {
+      pendingWithoutWasmd();
+      const pen = await Secp256k1Pen.fromMnemonic(faucet.mnemonic);
+
+      const memo = "My first contract on chain";
+      const theMsg: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: faucet.address,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number, sequence } = (await client.authAccounts(faucet.address)).result.value;
+
+      const signBytes = makeSignBytes([theMsg], fee, wasmd.chainId, memo, account_number, sequence);
+      const signature = await pen.sign(signBytes);
+      const signedTx = makeSignedTx(theMsg, fee, memo, signature);
+      const result = await client.postTx(signedTx);
+      expect(result.code).toBeUndefined();
+      expect(result).toEqual({
+        height: jasmine.stringMatching(nonNegativeIntegerMatcher),
+        txhash: jasmine.stringMatching(tendermintIdMatcher),
+        // code is not set
+        raw_log: jasmine.stringMatching(/^\[.+\]$/i),
+        logs: jasmine.any(Array),
+        gas_wanted: jasmine.stringMatching(nonNegativeIntegerMatcher),
+        gas_used: jasmine.stringMatching(nonNegativeIntegerMatcher),
+      });
+    });
+
+    it("can't send transaction with additional signatures", async () => {
+      pendingWithoutWasmd();
+      const account1 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(0));
+      const account2 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(1));
+      const account3 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(2));
+      const address1 = rawSecp256k1PubkeyToAddress(account1.pubkey, "cosmos");
+      const address2 = rawSecp256k1PubkeyToAddress(account2.pubkey, "cosmos");
+      const address3 = rawSecp256k1PubkeyToAddress(account3.pubkey, "cosmos");
+
+      const memo = "My first contract on chain";
+      const theMsg: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number: an1, sequence: sequence1 } = (await client.authAccounts(address1)).result.value;
+      const { account_number: an2, sequence: sequence2 } = (await client.authAccounts(address2)).result.value;
+      const { account_number: an3, sequence: sequence3 } = (await client.authAccounts(address3)).result.value;
+
+      const signBytes1 = makeSignBytes([theMsg], fee, wasmd.chainId, memo, an1, sequence1);
+      const signBytes2 = makeSignBytes([theMsg], fee, wasmd.chainId, memo, an2, sequence2);
+      const signBytes3 = makeSignBytes([theMsg], fee, wasmd.chainId, memo, an3, sequence3);
+      const signature1 = await account1.sign(signBytes1);
+      const signature2 = await account2.sign(signBytes2);
+      const signature3 = await account3.sign(signBytes3);
+      const signedTx = {
+        msg: [theMsg],
+        fee: fee,
+        memo: memo,
+        signatures: [signature1, signature2, signature3],
+      };
+      const postResult = await client.postTx(signedTx);
+      expect(postResult.code).toEqual(4);
+      expect(postResult.raw_log).toContain("wrong number of signers");
+    });
+
+    it("can send multiple messages with one signature", async () => {
+      pendingWithoutWasmd();
+      const account1 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(0));
+      const address1 = rawSecp256k1PubkeyToAddress(account1.pubkey, "cosmos");
+
+      const memo = "My first contract on chain";
+      const msg1: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+      const msg2: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "7654321",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number, sequence } = (await client.authAccounts(address1)).result.value;
+
+      const signBytes = makeSignBytes([msg1, msg2], fee, wasmd.chainId, memo, account_number, sequence);
+      const signature1 = await account1.sign(signBytes);
+      const signedTx = {
+        msg: [msg1, msg2],
+        fee: fee,
+        memo: memo,
+        signatures: [signature1],
+      };
+      const postResult = await client.postTx(signedTx);
+      expect(postResult.code).toBeUndefined();
+    });
+
+    it("can send multiple messages with multiple signatures", async () => {
+      pendingWithoutWasmd();
+      const account1 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(0));
+      const account2 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(1));
+      const address1 = rawSecp256k1PubkeyToAddress(account1.pubkey, "cosmos");
+      const address2 = rawSecp256k1PubkeyToAddress(account2.pubkey, "cosmos");
+
+      const memo = "My first contract on chain";
+      const msg1: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+      const msg2: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address2,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "7654321",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number: an1, sequence: sequence1 } = (await client.authAccounts(address1)).result.value;
+      const { account_number: an2, sequence: sequence2 } = (await client.authAccounts(address2)).result.value;
+
+      const signBytes1 = makeSignBytes([msg2, msg1], fee, wasmd.chainId, memo, an1, sequence1);
+      const signBytes2 = makeSignBytes([msg2, msg1], fee, wasmd.chainId, memo, an2, sequence2);
+      const signature1 = await account1.sign(signBytes1);
+      const signature2 = await account2.sign(signBytes2);
+      const signedTx = {
+        msg: [msg2, msg1],
+        fee: fee,
+        memo: memo,
+        signatures: [signature2, signature1],
+      };
+      const postResult = await client.postTx(signedTx);
+      expect(postResult.code).toBeUndefined();
+
+      await sleep(500);
+      const searched = await client.txsQuery(`tx.hash=${postResult.txhash}`);
+      expect(searched.txs.length).toEqual(1);
+      expect(searched.txs[0].tx.value.signatures).toEqual([signature2, signature1]);
+    });
+
+    it("can't send transaction with wrong signature order (1)", async () => {
+      pendingWithoutWasmd();
+      const account1 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(0));
+      const account2 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(1));
+      const address1 = rawSecp256k1PubkeyToAddress(account1.pubkey, "cosmos");
+      const address2 = rawSecp256k1PubkeyToAddress(account2.pubkey, "cosmos");
+
+      const memo = "My first contract on chain";
+      const msg1: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+      const msg2: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address2,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "7654321",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number: an1, sequence: sequence1 } = (await client.authAccounts(address1)).result.value;
+      const { account_number: an2, sequence: sequence2 } = (await client.authAccounts(address2)).result.value;
+
+      const signBytes1 = makeSignBytes([msg1, msg2], fee, wasmd.chainId, memo, an1, sequence1);
+      const signBytes2 = makeSignBytes([msg1, msg2], fee, wasmd.chainId, memo, an2, sequence2);
+      const signature1 = await account1.sign(signBytes1);
+      const signature2 = await account2.sign(signBytes2);
+      const signedTx = {
+        msg: [msg1, msg2],
+        fee: fee,
+        memo: memo,
+        signatures: [signature2, signature1],
+      };
+      const postResult = await client.postTx(signedTx);
+      expect(postResult.code).toEqual(8);
+    });
+
+    it("can't send transaction with wrong signature order (2)", async () => {
+      pendingWithoutWasmd();
+      const account1 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(0));
+      const account2 = await Secp256k1Pen.fromMnemonic(faucet.mnemonic, makeCosmoshubPath(1));
+      const address1 = rawSecp256k1PubkeyToAddress(account1.pubkey, "cosmos");
+      const address2 = rawSecp256k1PubkeyToAddress(account2.pubkey, "cosmos");
+
+      const memo = "My first contract on chain";
+      const msg1: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address1,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "1234567",
+            },
+          ],
+        },
+      };
+      const msg2: MsgSend = {
+        type: "cosmos-sdk/MsgSend",
+        value: {
+          from_address: address2,
+          to_address: emptyAddress,
+          amount: [
+            {
+              denom: "ucosm",
+              amount: "7654321",
+            },
+          ],
+        },
+      };
+
+      const fee: StdFee = {
+        amount: [
+          {
+            amount: "5000",
+            denom: "ucosm",
+          },
+        ],
+        gas: "890000",
+      };
+
+      const client = new LcdClient(wasmd.endpoint);
+      const { account_number: an1, sequence: sequence1 } = (await client.authAccounts(address1)).result.value;
+      const { account_number: an2, sequence: sequence2 } = (await client.authAccounts(address2)).result.value;
+
+      const signBytes1 = makeSignBytes([msg2, msg1], fee, wasmd.chainId, memo, an1, sequence1);
+      const signBytes2 = makeSignBytes([msg2, msg1], fee, wasmd.chainId, memo, an2, sequence2);
+      const signature1 = await account1.sign(signBytes1);
+      const signature2 = await account2.sign(signBytes2);
+      const signedTx = {
+        msg: [msg2, msg1],
+        fee: fee,
+        memo: memo,
+        signatures: [signature1, signature2],
+      };
+      const postResult = await client.postTx(signedTx);
+      expect(postResult.code).toEqual(8);
+    });
+  });
+});
diff --git a/packages/sdk38/src/lcdclient.ts b/packages/sdk38/src/lcdclient.ts
new file mode 100644
index 00000000..6fb8a86f
--- /dev/null
+++ b/packages/sdk38/src/lcdclient.ts
@@ -0,0 +1,217 @@
+/* eslint-disable no-dupe-class-members */
+import { assert, isNonNullObject } from "@cosmjs/utils";
+import axios, { AxiosError, AxiosInstance } from "axios";
+
+import {
+  AuthAccountsResponse,
+  BlockResponse,
+  BroadcastMode,
+  EncodeTxResponse,
+  NodeInfoResponse,
+  PostTxsResponse,
+  SearchTxsResponse,
+  TxsResponse,
+} from "./restclient";
+import { CosmosSdkTx, StdTx } from "./types";
+
+/** Unfortunately, Cosmos SDK encodes empty arrays as null */
+export type CosmosSdkArray<T> = ReadonlyArray<T> | null;
+
+export function normalizeArray<T>(backend: CosmosSdkArray<T>): ReadonlyArray<T> {
+  return backend || [];
+}
+
+type LcdClientModule = Record<string, () => any>;
+
+type LcdClientModuleRegisterer<M> = (base: LcdClient) => M;
+
+// We want to get message data from 500 errors
+// https://stackoverflow.com/questions/56577124/how-to-handle-500-error-message-with-axios
+// this should be chained to catch one error and throw a more informative one
+function parseAxiosError(err: AxiosError): never {
+  // use the error message sent from server, not default 500 msg
+  if (err.response?.data) {
+    let errorText: string;
+    const data = err.response.data;
+    // expect { error: string }, but otherwise dump
+    if (data.error && typeof data.error === "string") {
+      errorText = data.error;
+    } else if (typeof data === "string") {
+      errorText = data;
+    } else {
+      errorText = JSON.stringify(data);
+    }
+    throw new Error(`${errorText} (HTTP ${err.response.status})`);
+  } else {
+    throw err;
+  }
+}
+
+export class LcdClient {
+  /** Constructs an LCD client with 0 modules */
+  public static withModules(apiUrl: string, broadcastMode: BroadcastMode): LcdClient;
+
+  /** Constructs an LCD client with 1 modules */
+  public static withModules<A extends LcdClientModule>(
+    apiUrl: string,
+    broadcastMode: BroadcastMode,
+    moduleA: LcdClientModuleRegisterer<A>,
+  ): LcdClient & A;
+
+  /** Constructs an LCD client with 2 modules */
+  public static withModules<A extends LcdClientModule, B extends LcdClientModule>(
+    apiUrl: string,
+    broadcastMode: BroadcastMode,
+    moduleA: LcdClientModuleRegisterer<A>,
+    moduleB: LcdClientModuleRegisterer<B>,
+  ): LcdClient & A & B;
+
+  public static withModules<A extends LcdClientModule, B extends LcdClientModule>(
+    apiUrl: string,
+    broadcastMode: BroadcastMode,
+    moduleA?: LcdClientModuleRegisterer<A>,
+    moduleB?: LcdClientModuleRegisterer<B>,
+  ): any {
+    const client = new LcdClient(apiUrl, broadcastMode);
+
+    const modules = new Array<LcdClientModule>();
+    if (moduleA) modules.push(moduleA(client));
+    if (moduleB) modules.push(moduleB(client));
+    for (const module of modules) {
+      assert(isNonNullObject(module), `Module must be a non-null object`);
+      for (const key in module) {
+        assert(typeof key == "string", `Found non-string module key: ${key}`);
+        (client as any)[key] = module[key];
+      }
+    }
+
+    return client;
+  }
+
+  private readonly client: AxiosInstance;
+  private readonly broadcastMode: BroadcastMode;
+
+  /**
+   * Creates a new client to interact with a Cosmos SDK light client daemon.
+   * This class tries to be a direct mapping onto the API. Some basic decoding and normalizatin is done
+   * but things like caching are done at a higher level.
+   *
+   * When building apps, you should not need to use this class directly. If you do, this indicates a missing feature
+   * in higher level components. Feel free to raise an issue in this case.
+   *
+   * @param apiUrl The URL of a Cosmos SDK light client daemon API (sometimes called REST server or REST API)
+   * @param broadcastMode Defines at which point of the transaction processing the postTx method (i.e. transaction broadcasting) returns
+   */
+  public constructor(apiUrl: string, broadcastMode = BroadcastMode.Block) {
+    const headers = {
+      post: { "Content-Type": "application/json" },
+    };
+    this.client = axios.create({
+      baseURL: apiUrl,
+      headers: headers,
+    });
+    this.broadcastMode = broadcastMode;
+  }
+
+  public async get(path: string): Promise<any> {
+    const { data } = await this.client.get(path).catch(parseAxiosError);
+    if (data === null) {
+      throw new Error("Received null response from server");
+    }
+    return data;
+  }
+
+  public async post(path: string, params: any): Promise<any> {
+    if (!isNonNullObject(params)) throw new Error("Got unexpected type of params. Expected object.");
+    const { data } = await this.client.post(path, params).catch(parseAxiosError);
+    if (data === null) {
+      throw new Error("Received null response from server");
+    }
+    return data;
+  }
+
+  // The /auth endpoints
+
+  public async authAccounts(address: string): Promise<AuthAccountsResponse> {
+    const path = `/auth/accounts/${address}`;
+    const responseData = await this.get(path);
+    if (responseData.result.type !== "cosmos-sdk/Account") {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as AuthAccountsResponse;
+  }
+
+  // The /blocks endpoints
+
+  public async blocksLatest(): Promise<BlockResponse> {
+    const responseData = await this.get("/blocks/latest");
+    if (!responseData.block) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as BlockResponse;
+  }
+
+  public async blocks(height: number): Promise<BlockResponse> {
+    const responseData = await this.get(`/blocks/${height}`);
+    if (!responseData.block) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as BlockResponse;
+  }
+
+  // The /node_info endpoint
+
+  public async nodeInfo(): Promise<NodeInfoResponse> {
+    const responseData = await this.get("/node_info");
+    if (!responseData.node_info) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as NodeInfoResponse;
+  }
+
+  // The /txs endpoints
+
+  public async txById(id: string): Promise<TxsResponse> {
+    const responseData = await this.get(`/txs/${id}`);
+    if (!responseData.tx) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as TxsResponse;
+  }
+
+  public async txsQuery(query: string): Promise<SearchTxsResponse> {
+    const responseData = await this.get(`/txs?${query}`);
+    if (!responseData.txs) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as SearchTxsResponse;
+  }
+
+  /** returns the amino-encoding of the transaction performed by the server */
+  public async encodeTx(tx: CosmosSdkTx): Promise<EncodeTxResponse> {
+    const responseData = await this.post("/txs/encode", tx);
+    if (!responseData.tx) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as EncodeTxResponse;
+  }
+
+  /**
+   * Broadcasts a signed transaction to into the transaction pool.
+   * Depending on the RestClient's broadcast mode, this might or might
+   * wait for checkTx or deliverTx to be executed before returning.
+   *
+   * @param tx a signed transaction as StdTx (i.e. not wrapped in type/value container)
+   */
+  public async postTx(tx: StdTx): Promise<PostTxsResponse> {
+    const params = {
+      tx: tx,
+      mode: this.broadcastMode,
+    };
+    const responseData = await this.post("/txs", params);
+    if (!responseData.txhash) {
+      throw new Error("Unexpected response data format");
+    }
+    return responseData as PostTxsResponse;
+  }
+}
diff --git a/packages/sdk38/types/lcdclient.d.ts b/packages/sdk38/types/lcdclient.d.ts
new file mode 100644
index 00000000..5003d833
--- /dev/null
+++ b/packages/sdk38/types/lcdclient.d.ts
@@ -0,0 +1,66 @@
+import {
+  AuthAccountsResponse,
+  BlockResponse,
+  BroadcastMode,
+  EncodeTxResponse,
+  NodeInfoResponse,
+  PostTxsResponse,
+  SearchTxsResponse,
+  TxsResponse,
+} from "./restclient";
+import { CosmosSdkTx, StdTx } from "./types";
+/** Unfortunately, Cosmos SDK encodes empty arrays as null */
+export declare type CosmosSdkArray<T> = ReadonlyArray<T> | null;
+export declare function normalizeArray<T>(backend: CosmosSdkArray<T>): ReadonlyArray<T>;
+declare type LcdClientModule = Record<string, () => any>;
+declare type LcdClientModuleRegisterer<M> = (base: LcdClient) => M;
+export declare class LcdClient {
+  /** Constructs an LCD client with 0 modules */
+  static withModules(apiUrl: string, broadcastMode: BroadcastMode): LcdClient;
+  /** Constructs an LCD client with 1 modules */
+  static withModules<A extends LcdClientModule>(
+    apiUrl: string,
+    broadcastMode: BroadcastMode,
+    moduleA: LcdClientModuleRegisterer<A>,
+  ): LcdClient & A;
+  /** Constructs an LCD client with 2 modules */
+  static withModules<A extends LcdClientModule, B extends LcdClientModule>(
+    apiUrl: string,
+    broadcastMode: BroadcastMode,
+    moduleA: LcdClientModuleRegisterer<A>,
+    moduleB: LcdClientModuleRegisterer<B>,
+  ): LcdClient & A & B;
+  private readonly client;
+  private readonly broadcastMode;
+  /**
+   * Creates a new client to interact with a Cosmos SDK light client daemon.
+   * This class tries to be a direct mapping onto the API. Some basic decoding and normalizatin is done
+   * but things like caching are done at a higher level.
+   *
+   * When building apps, you should not need to use this class directly. If you do, this indicates a missing feature
+   * in higher level components. Feel free to raise an issue in this case.
+   *
+   * @param apiUrl The URL of a Cosmos SDK light client daemon API (sometimes called REST server or REST API)
+   * @param broadcastMode Defines at which point of the transaction processing the postTx method (i.e. transaction broadcasting) returns
+   */
+  constructor(apiUrl: string, broadcastMode?: BroadcastMode);
+  get(path: string): Promise<any>;
+  post(path: string, params: any): Promise<any>;
+  authAccounts(address: string): Promise<AuthAccountsResponse>;
+  blocksLatest(): Promise<BlockResponse>;
+  blocks(height: number): Promise<BlockResponse>;
+  nodeInfo(): Promise<NodeInfoResponse>;
+  txById(id: string): Promise<TxsResponse>;
+  txsQuery(query: string): Promise<SearchTxsResponse>;
+  /** returns the amino-encoding of the transaction performed by the server */
+  encodeTx(tx: CosmosSdkTx): Promise<EncodeTxResponse>;
+  /**
+   * Broadcasts a signed transaction to into the transaction pool.
+   * Depending on the RestClient's broadcast mode, this might or might
+   * wait for checkTx or deliverTx to be executed before returning.
+   *
+   * @param tx a signed transaction as StdTx (i.e. not wrapped in type/value container)
+   */
+  postTx(tx: StdTx): Promise<PostTxsResponse>;
+}
+export {};