diff --git a/multichain-testing/test/account-balance-queries.test.ts b/multichain-testing/test/account-balance-queries.test.ts
index c067ced9446..606d98f471e 100644
--- a/multichain-testing/test/account-balance-queries.test.ts
+++ b/multichain-testing/test/account-balance-queries.test.ts
@@ -40,7 +40,7 @@ const queryAccountBalances = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
     } = t.context;
 
@@ -67,7 +67,8 @@ const queryAccountBalances = test.macro({
     });
 
     const offerResult = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+      // @ts-expect-error UpdateRecord may not have 'status'
       ({ status }) => status.id === offerId && (status.result || status.error),
       `${offerId} offer result is in vstorage`,
       MAKE_ACCOUNT_AND_QUERY_BALANCE_TIMEOUT,
@@ -83,6 +84,7 @@ const queryAccountBalances = test.macro({
     );
 
     const {
+      // @ts-expect-error UpdateRecord may not have 'status'
       status: { result, error },
     } = offerResult;
     if (expectValidResult) {
@@ -110,7 +112,7 @@ const queryAccountBalance = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -146,7 +148,8 @@ const queryAccountBalance = test.macro({
     });
 
     const offerResult = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+      // @ts-expect-error UpdateRecord may not have 'status'
       ({ status }) => status.id === offerId && (status.result || status.error),
       `${offerId} offer result is in vstorage`,
       MAKE_ACCOUNT_AND_QUERY_BALANCE_TIMEOUT,
@@ -162,6 +165,7 @@ const queryAccountBalance = test.macro({
     );
 
     const {
+      // @ts-expect-error UpdateRecord may not have 'status'
       status: { result, error },
     } = offerResult;
     if (expectValidResult) {
diff --git a/multichain-testing/test/auto-stake-it.test.ts b/multichain-testing/test/auto-stake-it.test.ts
index 10e3bac8db8..e13a9cca186 100644
--- a/multichain-testing/test/auto-stake-it.test.ts
+++ b/multichain-testing/test/auto-stake-it.test.ts
@@ -36,7 +36,7 @@ const autoStakeItScenario = test.macro({
     // 1. setup
     const {
       wallets,
-      vstorageClient,
+      smartWalletKit,
       provisionSmartWallet,
       retryUntilCondition,
       useChain,
@@ -98,9 +98,9 @@ const autoStakeItScenario = test.macro({
 
     // FIXME https://github.com/Agoric/agoric-sdk/issues/9643
     const currentWalletRecord = await retryUntilCondition(
-      () =>
-        vstorageClient.queryData(`published.wallet.${agoricUserAddr}.current`),
+      () => smartWalletKit.readPublished(`wallet.${agoricUserAddr}.current`),
       ({ offerToPublicSubscriberPaths }) =>
+        // @ts-expect-error retryUntilCondition expects a boolean return
         Object.fromEntries(offerToPublicSubscriberPaths)[offerId],
       `${offerId} continuing invitation is in vstorage`,
     );
@@ -118,6 +118,7 @@ const autoStakeItScenario = test.macro({
       .split('.')
       .pop();
     console.log({ lcaAddress, icaAddress });
+    assert(lcaAddress && icaAddress);
     t.regex(lcaAddress, /^agoric1/, 'LOA address is valid');
     t.regex(
       icaAddress,
diff --git a/multichain-testing/test/basic-flows.test.ts b/multichain-testing/test/basic-flows.test.ts
index 1d53b4aae8d..e8a16e48181 100644
--- a/multichain-testing/test/basic-flows.test.ts
+++ b/multichain-testing/test/basic-flows.test.ts
@@ -38,7 +38,7 @@ const makeAccountScenario = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
     } = t.context;
 
@@ -66,8 +66,9 @@ const makeAccountScenario = test.macro({
     // TODO fix above so we don't have to poll for the offer result to be published
     // https://github.com/Agoric/agoric-sdk/issues/9643
     const currentWalletRecord = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
       ({ offerToPublicSubscriberPaths }) =>
+        // @ts-expect-error retryUntilCondition expects a boolean return
         Object.fromEntries(offerToPublicSubscriberPaths)[offerId],
       `${offerId} continuing invitation is in vstorage`,
     );
@@ -80,17 +81,19 @@ const makeAccountScenario = test.macro({
       .split('.')
       .pop();
     t.log('Got address:', address);
+    assert(address);
     t.regex(
       address,
       new RegExp(`^${config.expectedAddressPrefix}1`),
       `address for ${chainName} is valid`,
     );
 
-    const latestWalletUpdate = await vstorageClient.queryData(
-      `published.wallet.${agoricAddr}`,
+    const latestWalletUpdate = await smartWalletKit.readPublished(
+      `wallet.${agoricAddr}`,
     );
     t.log('latest wallet update', latestWalletUpdate);
     t.like(
+      // @ts-expect-error UpdateRecord may not have 'status'
       latestWalletUpdate.status,
       {
         id: offerId,
diff --git a/multichain-testing/test/chain-queries.test.ts b/multichain-testing/test/chain-queries.test.ts
index 56673742582..b1c0fae4e54 100644
--- a/multichain-testing/test/chain-queries.test.ts
+++ b/multichain-testing/test/chain-queries.test.ts
@@ -48,7 +48,7 @@ const queryICQChain = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -108,7 +108,8 @@ const queryICQChain = test.macro({
     });
 
     const offerResult = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+      // @ts-expect-error UpdateRecord may not have 'status'
       ({ status }) => status.id === offerId && (status.result || status.error),
       `${offerId} offer result is in vstorage`,
       {
@@ -117,6 +118,7 @@ const queryICQChain = test.macro({
     );
     t.log('ICQ Query Offer Result', offerResult);
     const {
+      // @ts-expect-error UpdateRecord may not have 'status'
       status: { result, error },
     } = offerResult;
     t.is(error, undefined, 'No error observed');
@@ -160,7 +162,7 @@ const queryChainWithoutICQ = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -200,7 +202,8 @@ const queryChainWithoutICQ = test.macro({
     });
 
     const offerResult = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+      // @ts-expect-error UpdateRecord may not have 'status'
       ({ status }) => status.id === offerId && (status.result || status.error),
       `${offerId} continuing invitation is in vstorage`,
       {
@@ -208,6 +211,7 @@ const queryChainWithoutICQ = test.macro({
       },
     );
     t.is(
+      // @ts-expect-error UpdateRecord may not have 'status'
       offerResult.status.error,
       `Error: Queries not available for chain "${chain_id}"`,
       'Queries not available error returned',
@@ -216,7 +220,7 @@ const queryChainWithoutICQ = test.macro({
 });
 
 test.serial('Send Local Query from chain object', async t => {
-  const { wallets, provisionSmartWallet, vstorageClient, retryUntilCondition } =
+  const { wallets, provisionSmartWallet, smartWalletKit, retryUntilCondition } =
     t.context;
 
   const agoricAddr = wallets['agoric'];
@@ -268,7 +272,8 @@ test.serial('Send Local Query from chain object', async t => {
   });
 
   const offerResult = await retryUntilCondition(
-    () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+    () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+    // @ts-expect-error UpdateRecord may not have 'status'
     ({ status }) => status.id === offerId && (status.result || status.error),
     `${offerId} continuing invitation is in vstorage`,
     {
@@ -276,6 +281,7 @@ test.serial('Send Local Query from chain object', async t => {
     },
   );
 
+  // @ts-expect-error UpdateRecord may not have 'status'
   const parsedResults = JSON.parse(offerResult.status.result);
   t.truthy(parsedResults[0].height, 'query height is returned');
   t.is(parsedResults[0].error, '', 'error is empty');
diff --git a/multichain-testing/test/deposit-withdraw-lca.test.ts b/multichain-testing/test/deposit-withdraw-lca.test.ts
index 7d1cbafa97c..1bcb54746ab 100644
--- a/multichain-testing/test/deposit-withdraw-lca.test.ts
+++ b/multichain-testing/test/deposit-withdraw-lca.test.ts
@@ -31,7 +31,7 @@ test('Deposit IST to orchAccount and then withdraw', async t => {
   const {
     wallets,
     provisionSmartWallet,
-    vstorageClient,
+    smartWalletKit,
     retryUntilCondition,
     useChain,
   } = t.context;
@@ -61,8 +61,9 @@ test('Deposit IST to orchAccount and then withdraw', async t => {
 
   // Wait for the orchAccount to be created
   const { offerToPublicSubscriberPaths } = await retryUntilCondition(
-    () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+    () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
     ({ offerToPublicSubscriberPaths }) =>
+      // @ts-expect-error retryUntilCondition expects a boolean return
       Object.fromEntries(offerToPublicSubscriberPaths)[makeAccountOfferId],
     'makeAccount offer result is in vstorage',
   );
@@ -72,10 +73,10 @@ test('Deposit IST to orchAccount and then withdraw', async t => {
     makeAccountOfferId
   ]!.account;
   const lcaAddress = accountStoragePath.split('.').at(-1);
-  t.truthy(lcaAddress, 'Account address is in storage path');
+  assert(lcaAddress, 'Account address is in storage path');
 
   // Get IST brand
-  const brands = await vstorageClient.queryData('published.agoricNames.brand');
+  const brands = await smartWalletKit.readPublished('agoricNames.brand');
   const istBrand = Object.fromEntries(brands).IST;
 
   // Deposit IST to orchAccount
@@ -150,7 +151,7 @@ test('Deposit IST to orchAccount and then withdraw', async t => {
 test.todo('Deposit and Withdraw ATOM/OSMO to localOrchAccount via offer #9966');
 
 test('Attempt to withdraw more than available balance', async t => {
-  const { wallets, provisionSmartWallet, vstorageClient, retryUntilCondition } =
+  const { wallets, provisionSmartWallet, smartWalletKit, retryUntilCondition } =
     t.context;
 
   // Provision the Agoric smart wallet
@@ -178,8 +179,9 @@ test('Attempt to withdraw more than available balance', async t => {
 
   // Wait for the orchAccount to be created
   const { offerToPublicSubscriberPaths } = await retryUntilCondition(
-    () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+    () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
     ({ offerToPublicSubscriberPaths }) =>
+      // @ts-expect-error retryUntilCondition expects a boolean return
       Object.fromEntries(offerToPublicSubscriberPaths)[makeAccountOfferId],
     `${makeAccountOfferId} offer result is in vstorage`,
   );
@@ -191,7 +193,7 @@ test('Attempt to withdraw more than available balance', async t => {
   t.truthy(lcaAddress, 'Account address is in storage path');
 
   // Get IST brand
-  const brands = await vstorageClient.queryData('published.agoricNames.brand');
+  const brands = await smartWalletKit.readPublished('agoricNames.brand');
   const istBrand = Object.fromEntries(brands).IST;
 
   // Attempt to withdraw more than available balance
@@ -212,11 +214,13 @@ test('Attempt to withdraw more than available balance', async t => {
 
   // Verify that the withdrawal failed
   const offerResult = await retryUntilCondition(
-    () => vstorageClient.queryData(`published.wallet.${agoricAddr}`),
+    () => smartWalletKit.readPublished(`wallet.${agoricAddr}`),
+    // @ts-expect-error UpdateRecord may not have 'status'
     ({ status }) => status.id === withdrawOfferId && status.error !== undefined,
     'Withdrawal offer error is in vstorage',
   );
   t.is(
+    // @ts-expect-error UpdateRecord may not have 'status'
     offerResult.status.error,
     'Error: One or more withdrawals failed ["[Error: cannot grab 200uist coins: 0uist is smaller than 200uist: insufficient funds]"]',
   );
diff --git a/multichain-testing/test/deposit-withdraw-portfolio.test.ts b/multichain-testing/test/deposit-withdraw-portfolio.test.ts
index 49b7f3d8ad7..3e9416b2098 100644
--- a/multichain-testing/test/deposit-withdraw-portfolio.test.ts
+++ b/multichain-testing/test/deposit-withdraw-portfolio.test.ts
@@ -34,7 +34,7 @@ const portfolioAccountScenario = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -64,8 +64,9 @@ const portfolioAccountScenario = test.macro({
     });
 
     const { offerToPublicSubscriberPaths } = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
       ({ offerToPublicSubscriberPaths }) =>
+        // @ts-expect-error retryUntilCondition expects a boolean return
         Object.fromEntries(offerToPublicSubscriberPaths)[
           makePortfolioAcctOfferId
         ],
@@ -81,13 +82,11 @@ const portfolioAccountScenario = test.macro({
 
     const agoricLcaAddress = accountPaths.agoric.split('.').at(-1);
     const remoteIcaAddress = accountPaths[chainName].split('.').at(-1);
-    t.truthy(agoricLcaAddress, 'Agoric LCA address is in storage path');
-    t.truthy(remoteIcaAddress, `${chainName} ICA address is in storage path`);
+    assert(agoricLcaAddress, 'Agoric LCA address is in storage path');
+    assert(remoteIcaAddress, `${chainName} ICA address is in storage path`);
 
     // Get IST brand
-    const brands = await vstorageClient.queryData(
-      'published.agoricNames.brand',
-    );
+    const brands = await smartWalletKit.readPublished('agoricNames.brand');
     const istBrand = Object.fromEntries(brands).IST;
 
     // Setup query clients
diff --git a/multichain-testing/test/fast-usdc/fast-usdc.test.ts b/multichain-testing/test/fast-usdc/fast-usdc.test.ts
index a7fbf413e32..753e4344f5d 100644
--- a/multichain-testing/test/fast-usdc/fast-usdc.test.ts
+++ b/multichain-testing/test/fast-usdc/fast-usdc.test.ts
@@ -15,10 +15,7 @@ import { makeFeedPolicy, oracleMnemonics } from './config.js';
 import { makeRandomDigits } from '../../tools/random.js';
 import { balancesFromPurses } from '../../tools/purse.js';
 import { makeTracer } from '@agoric/internal';
-import type {
-  CctpTxEvidence,
-  EvmAddress,
-} from '@agoric/fast-usdc/src/types.js';
+import type { CctpTxEvidence, EvmAddress } from '@agoric/fast-usdc';
 
 const log = makeTracer('MCFU');
 
@@ -110,8 +107,8 @@ test.after(async t => {
 const toOracleOfferId = (idx: number) => `oracle${idx + 1}-accept`;
 
 test.serial('oracles accept', async t => {
-  const { oracleWds, retryUntilCondition, vstorageClient, wallets } = t.context;
-  const brands = await vstorageClient.queryData('published.agoricNames.brand');
+  const { oracleWds, retryUntilCondition, smartWalletKit, wallets } = t.context;
+  const brands = await smartWalletKit.readPublished('agoricNames.brand');
   const { Invitation } = Object.fromEntries(brands);
 
   const description = 'oracle operator invitation';
@@ -119,9 +116,9 @@ test.serial('oracles accept', async t => {
   // ensure we have an unused (or used) oracle invitation in each purse
   let hasAccepted = false;
   for (const name of keys(oracleMnemonics)) {
-    const { offerToUsedInvitation, purses } = await vstorageClient.queryData(
-      `published.wallet.${wallets[name]}.current`,
-    );
+    const { offerToUsedInvitation, purses } =
+      await smartWalletKit.readPublished(`wallet.${wallets[name]}.current`);
+    // @ts-expect-error Brand cannot be used as an index type
     const { value: invitations } = balancesFromPurses(purses)[Invitation];
     const hasInvitation = invitations.some(x => x.description === description);
     const usedInvitation = offerToUsedInvitation?.[0]?.[0] === `${name}-accept`;
@@ -136,7 +133,7 @@ test.serial('oracles accept', async t => {
 
   // accept oracle operator invitations
   const instance = fromEntries(
-    await vstorageClient.queryData('published.agoricNames.instance'),
+    await smartWalletKit.readPublished('agoricNames.instance'),
   )[contractName];
   await Promise.all(
     oracleWds.map(makeDoOffer).map((doOffer, i) =>
@@ -156,7 +153,7 @@ test.serial('oracles accept', async t => {
     const addr = wallets[name];
     await t.notThrowsAsync(() =>
       retryUntilCondition(
-        () => vstorageClient.queryData(`published.wallet.${addr}.current`),
+        () => smartWalletKit.readPublished(`wallet.${addr}.current`),
         ({ offerToUsedInvitation }) => {
           return offerToUsedInvitation[0][0] === `${name}-accept`;
         },
@@ -168,16 +165,16 @@ test.serial('oracles accept', async t => {
 });
 
 test.serial('lp deposits', async t => {
-  const { lpUser, retryUntilCondition, vstorageClient, wallets } = t.context;
+  const { lpUser, retryUntilCondition, smartWalletKit, wallets } = t.context;
 
   const lpDoOffer = makeDoOffer(lpUser);
-  const brands = await vstorageClient.queryData('published.agoricNames.brand');
+  const brands = await smartWalletKit.readPublished('agoricNames.brand');
   const { USDC, FastLP } = Object.fromEntries(brands);
 
   const usdcToGive = make(USDC, LP_DEPOSIT_AMOUNT);
 
-  const { shareWorth: currShareWorth } = await vstorageClient.queryData(
-    `published.${contractName}.poolMetrics`,
+  const { shareWorth: currShareWorth } = await smartWalletKit.readPublished(
+    `${contractName}.poolMetrics`,
   );
   const poolSharesWanted = divideBy(usdcToGive, currShareWorth);
 
@@ -196,7 +193,7 @@ test.serial('lp deposits', async t => {
 
   await t.notThrowsAsync(() =>
     retryUntilCondition(
-      () => vstorageClient.queryData(`published.${contractName}.poolMetrics`),
+      () => smartWalletKit.readPublished(`${contractName}.poolMetrics`),
       ({ shareWorth }) =>
         !isGTE(currShareWorth.numerator, shareWorth.numerator),
       'share worth numerator increases from deposit',
@@ -206,9 +203,9 @@ test.serial('lp deposits', async t => {
 
   await t.notThrowsAsync(() =>
     retryUntilCondition(
-      () =>
-        vstorageClient.queryData(`published.wallet.${wallets['lp']}.current`),
+      () => smartWalletKit.readPublished(`wallet.${wallets['lp']}.current`),
       ({ purses }) => {
+        // @ts-expect-error Brand cannot be used as an index type
         const currentPoolShares = balancesFromPurses(purses)[FastLP];
         return currentPoolShares && isGTE(currentPoolShares, poolSharesWanted);
       },
@@ -230,7 +227,6 @@ const advanceAndSettleScenario = test.macro({
       smartWalletKit,
       useChain,
       usdcOnOsmosis,
-      vstorageClient,
     } = t.context;
 
     // EUD wallet on the specified chain
@@ -241,8 +237,8 @@ const advanceAndSettleScenario = test.macro({
     t.log(`EUD wallet created: ${EUD}`);
 
     // parameterize agoric address
-    const { settlementAccount } = await vstorageClient.queryData(
-      `published.${contractName}`,
+    const { settlementAccount } = await smartWalletKit.readPublished(
+      `${contractName}`,
     );
     t.log('settlementAccount address', settlementAccount);
 
@@ -344,7 +340,7 @@ const advanceAndSettleScenario = test.macro({
     nobleTools.mockCctpMint(mintAmt, userForwardingAddr);
     await t.notThrowsAsync(() =>
       retryUntilCondition(
-        () => vstorageClient.queryData(`published.${contractName}.poolMetrics`),
+        () => smartWalletKit.readPublished(`${contractName}.poolMetrics`),
         ({ encumberedBalance }) =>
           encumberedBalance && isEmpty(encumberedBalance),
         'encumberedBalance returns to 0',
@@ -365,23 +361,24 @@ test.serial('lp withdraws', async t => {
     retryUntilCondition,
     useChain,
     usdcDenom,
-    vstorageClient,
+    smartWalletKit,
     wallets,
   } = t.context;
   const queryClient = makeQueryClient(
     await useChain('agoric').getRestEndpoint(),
   );
   const lpDoOffer = makeDoOffer(lpUser);
-  const brands = await vstorageClient.queryData('published.agoricNames.brand');
+  const brands = await smartWalletKit.readPublished('agoricNames.brand');
   const { FastLP } = Object.fromEntries(brands);
   t.log('FastLP brand', FastLP);
 
-  const { shareWorth: currShareWorth } = await vstorageClient.queryData(
-    `published.${contractName}.poolMetrics`,
+  const { shareWorth: currShareWorth } = await smartWalletKit.readPublished(
+    `${contractName}.poolMetrics`,
   );
-  const { purses } = await vstorageClient.queryData(
-    `published.wallet.${wallets['lp']}.current`,
+  const { purses } = await smartWalletKit.readPublished(
+    `wallet.${wallets['lp']}.current`,
   );
+  // @ts-expect-error Brand cannot be used as an index type
   const currentPoolShares = balancesFromPurses(purses)[FastLP];
   t.log('currentPoolShares', currentPoolShares);
   const usdcWanted = multiplyBy(currentPoolShares, currShareWorth);
@@ -408,9 +405,9 @@ test.serial('lp withdraws', async t => {
 
   await t.notThrowsAsync(() =>
     retryUntilCondition(
-      () =>
-        vstorageClient.queryData(`published.wallet.${wallets['lp']}.current`),
+      () => smartWalletKit.readPublished(`wallet.${wallets['lp']}.current`),
       ({ purses }) => {
+        // @ts-expect-error Brand cannot be used as an index type
         const currentPoolShares = balancesFromPurses(purses)[FastLP];
         return !currentPoolShares || isEmpty(currentPoolShares);
       },
diff --git a/multichain-testing/test/fast-usdc/noble-forwarding.test.ts b/multichain-testing/test/fast-usdc/noble-forwarding.test.ts
index 84ce4f3ae95..3c3b252fdf3 100644
--- a/multichain-testing/test/fast-usdc/noble-forwarding.test.ts
+++ b/multichain-testing/test/fast-usdc/noble-forwarding.test.ts
@@ -8,7 +8,7 @@ import { makeQueryClient } from '../../tools/query.js';
 const test = anyTest as TestFn<SetupContext>;
 
 test('noble forwarding', async t => {
-  const { nobleTools, retryUntilCondition, useChain, vstorageClient } =
+  const { nobleTools, retryUntilCondition, useChain, smartWalletKit } =
     await commonSetup(t);
 
   const agoricWallet = await createWallet('agoric');
@@ -21,7 +21,7 @@ test('noble forwarding', async t => {
   const connInfoPath = `published.agoricNames.chainConnection.${agoricChainId}_${nobleChainId}`;
   const {
     transferChannel: { counterPartyChannelId, channelId },
-  }: IBCConnectionInfo = await vstorageClient.queryData(connInfoPath);
+  } = (await smartWalletKit.readLatestHead(connInfoPath)) as IBCConnectionInfo;
 
   t.regex(
     counterPartyChannelId,
diff --git a/multichain-testing/test/ica-channel-close.test.ts b/multichain-testing/test/ica-channel-close.test.ts
index 6ee59dc825f..4577be95421 100644
--- a/multichain-testing/test/ica-channel-close.test.ts
+++ b/multichain-testing/test/ica-channel-close.test.ts
@@ -61,7 +61,7 @@ const intentionalCloseAccountScenario = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -88,8 +88,9 @@ const intentionalCloseAccountScenario = test.macro({
       proposal: {},
     });
     const currentWalletRecord = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
       ({ offerToPublicSubscriberPaths }) =>
+        // @ts-expect-error retryUntilCondition expects a boolean return
         Object.fromEntries(offerToPublicSubscriberPaths)[offerId],
       `${offerId} continuing invitation is in vstorage`,
     );
@@ -102,11 +103,10 @@ const intentionalCloseAccountScenario = test.macro({
     const address = accountStoragePath.split('.').pop();
     t.log('Got address:', address);
 
-    const {
-      remoteAddress,
-      localAddress,
-    }: CosmosOrchestrationAccountStorageState =
-      await vstorageClient.queryData(accountStoragePath);
+    const { remoteAddress, localAddress } =
+      (await smartWalletKit.readLatestHead(
+        accountStoragePath,
+      )) as CosmosOrchestrationAccountStorageState;
     const { rPortID, rChannelID } = parseRemoteAddress(remoteAddress);
 
     const remoteQueryClient = makeQueryClient(
@@ -214,7 +214,7 @@ const channelCloseInitScenario = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
       hermes,
@@ -241,8 +241,9 @@ const channelCloseInitScenario = test.macro({
       proposal: {},
     });
     const currentWalletRecord = await retryUntilCondition(
-      () => vstorageClient.queryData(`published.wallet.${agoricAddr}.current`),
+      () => smartWalletKit.readPublished(`wallet.${agoricAddr}.current`),
       ({ offerToPublicSubscriberPaths }) =>
+        // @ts-expect-error retryUntilCondition expects boolean return
         Object.fromEntries(offerToPublicSubscriberPaths)[offerId],
       `${offerId} continuing invitation is in vstorage`,
     );
@@ -255,11 +256,10 @@ const channelCloseInitScenario = test.macro({
     const address = accountStoragePath.split('.').pop();
     t.log('Got address:', address);
 
-    const {
-      remoteAddress,
-      localAddress,
-    }: CosmosOrchestrationAccountStorageState =
-      await vstorageClient.queryData(accountStoragePath);
+    const { remoteAddress, localAddress } =
+      (await smartWalletKit.readLatestHead(
+        accountStoragePath,
+      )) as CosmosOrchestrationAccountStorageState;
     const { rPortID, rChannelID, rConnectionID } =
       parseRemoteAddress(remoteAddress);
     const { lPortID, lChannelID, lConnectionID } =
diff --git a/multichain-testing/test/send-anywhere.test.ts b/multichain-testing/test/send-anywhere.test.ts
index df4bbdca8d6..83071908311 100644
--- a/multichain-testing/test/send-anywhere.test.ts
+++ b/multichain-testing/test/send-anywhere.test.ts
@@ -51,7 +51,7 @@ const sendAnywhereScenario = test.macro({
     const {
       wallets,
       provisionSmartWallet,
-      vstorageClient,
+      smartWalletKit,
       retryUntilCondition,
       useChain,
     } = t.context;
@@ -69,9 +69,7 @@ const sendAnywhereScenario = test.macro({
 
     const doOffer = makeDoOffer(wdUser1);
 
-    const brands = await vstorageClient.queryData(
-      'published.agoricNames.brand',
-    );
+    const brands = await smartWalletKit.readPublished('agoricNames.brand');
     const brand = Object.fromEntries(brands)[brandKw];
 
     const apiUrl = await useChain(destChainName).getRestEndpoint();
diff --git a/multichain-testing/test/smart-wallet.test.ts b/multichain-testing/test/smart-wallet.test.ts
index 22faec70baa..016d8c61cba 100644
--- a/multichain-testing/test/smart-wallet.test.ts
+++ b/multichain-testing/test/smart-wallet.test.ts
@@ -17,13 +17,13 @@ test.after(async t => {
 });
 
 test('provision smart wallet', async t => {
-  const { wallets, provisionSmartWallet, vstorageClient, useChain } = t.context;
+  const { wallets, provisionSmartWallet, smartWalletKit, useChain } = t.context;
 
   const wallet = await provisionSmartWallet(wallets.user1, { BLD: 100n });
   t.log('wallet', wallet);
 
-  const walletCurrent = await vstorageClient.queryData(
-    `published.wallet.${wallets.user1}.current`,
+  const walletCurrent = await smartWalletKit.readPublished(
+    `wallet.${wallets.user1}.current`,
   );
   t.like(walletCurrent, { liveOffers: [], offerToPublicSubscriberPaths: [] });
 
diff --git a/multichain-testing/test/stake-ica.test.ts b/multichain-testing/test/stake-ica.test.ts
index 7ef65ad33eb..b5b2dd473c0 100644
--- a/multichain-testing/test/stake-ica.test.ts
+++ b/multichain-testing/test/stake-ica.test.ts
@@ -43,7 +43,7 @@ const stakeScenario = test.macro(async (t, scenario: StakeIcaScenario) => {
   const {
     wallets,
     provisionSmartWallet,
-    vstorageClient,
+    smartWalletKit,
     retryUntilCondition,
     useChain,
     startContract,
@@ -77,8 +77,8 @@ const stakeScenario = test.macro(async (t, scenario: StakeIcaScenario) => {
   const { offerToPublicSubscriberPaths: makeAccountPublicSubscriberPaths } =
     await retryUntilCondition(
       () =>
-        vstorageClient.queryData(
-          `published.wallet.${wallets[scenario.wallet]}.current`,
+        smartWalletKit.readPublished(
+          `wallet.${wallets[scenario.wallet]}.current`,
         ),
       ({ offerToPublicSubscriberPaths }) =>
         !!offerToPublicSubscriberPaths.length,
@@ -92,6 +92,7 @@ const stakeScenario = test.macro(async (t, scenario: StakeIcaScenario) => {
     .split('.')
     .pop();
   t.log('Got address:', address);
+  assert(address);
   t.regex(
     address,
     new RegExp(`^${scenario.expectedAddressPrefix}1`),
@@ -142,11 +143,12 @@ const stakeScenario = test.macro(async (t, scenario: StakeIcaScenario) => {
     proposal: {},
   });
 
-  const latestWalletUpdate = await vstorageClient.queryData(
-    `published.wallet.${wallets[scenario.wallet]}`,
+  const latestWalletUpdate = await smartWalletKit.readPublished(
+    `wallet.${wallets[scenario.wallet]}`,
   );
   t.log('latest wallet update', latestWalletUpdate);
   t.like(
+    // @ts-expect-error UpdateRecord may not have 'status'
     latestWalletUpdate.status,
     {
       id: delegateOfferId,
diff --git a/multichain-testing/test/support.ts b/multichain-testing/test/support.ts
index f71e2c112cc..6961a6a82b1 100644
--- a/multichain-testing/test/support.ts
+++ b/multichain-testing/test/support.ts
@@ -113,9 +113,9 @@ export const commonSetup = async (t: ExecutionContext) => {
     contractBuilder: string,
     builderOpts?: Record<string, string | string[]>,
   ) => {
-    const { vstorageClient } = tools;
+    const { smartWalletKit } = tools;
     const instances = Object.fromEntries(
-      await vstorageClient.queryData(`published.agoricNames.instance`),
+      await smartWalletKit.readPublished(`agoricNames.instance`),
     );
     if (contractName in instances) {
       return t.log('Contract found. Skipping installation...');
@@ -123,7 +123,7 @@ export const commonSetup = async (t: ExecutionContext) => {
     t.log('bundle and install contract', contractName);
     await deployBuilder(contractBuilder, builderOpts);
     await retryUntilCondition(
-      () => vstorageClient.queryData(`published.agoricNames.instance`),
+      () => smartWalletKit.readPublished(`agoricNames.instance`),
       res => contractName in Object.fromEntries(res),
       `${contractName} instance is available`,
     );
diff --git a/multichain-testing/tools/e2e-tools.js b/multichain-testing/tools/e2e-tools.js
index 448f8b81895..d2aaed9cbac 100644
--- a/multichain-testing/tools/e2e-tools.js
+++ b/multichain-testing/tools/e2e-tools.js
@@ -553,7 +553,6 @@ export const makeE2ETools = async (
   );
 
   return {
-    vstorageClient,
     smartWalletKit,
     installBundles,
     runCoreEval: buildAndRunCoreEval,
diff --git a/multichain-testing/tools/noble-tools.ts b/multichain-testing/tools/noble-tools.ts
index cd72a332857..c6aab6c5e0d 100644
--- a/multichain-testing/tools/noble-tools.ts
+++ b/multichain-testing/tools/noble-tools.ts
@@ -1,7 +1,7 @@
 import type { IBCChannelID } from '@agoric/vats';
 import type { ExecSync } from './agd-lib.js';
 import type { ChainAddress } from '@agoric/orchestration';
-import type { NobleAddress } from '@agoric/fast-usdc/src/types.js';
+import type { NobleAddress } from '@agoric/fast-usdc';
 
 const kubectlBinary = 'kubectl';
 const noblePod = 'noblelocal-genesis-0';
diff --git a/packages/builders/scripts/fast-usdc/fast-usdc-update.build.js b/packages/builders/scripts/fast-usdc/fast-usdc-update.build.js
index 21a1e6a0573..4f8ab6993ac 100644
--- a/packages/builders/scripts/fast-usdc/fast-usdc-update.build.js
+++ b/packages/builders/scripts/fast-usdc/fast-usdc-update.build.js
@@ -7,7 +7,7 @@ import { makeHelpers } from '@agoric/deploy-script-support';
 /**
  * @import {CoreEvalBuilder, DeployScriptFunction} from '@agoric/deploy-script-support/src/externalTypes.js'
  * @import {ParseArgsConfig} from 'node:util'
- * @import {FastUSDCConfig} from '@agoric/fast-usdc/src/types.js'
+ * @import {FastUSDCConfig} from '@agoric/fast-usdc';
  */
 
 /** @type {ParseArgsConfig['options']} */
diff --git a/packages/builders/scripts/fast-usdc/init-fast-usdc.js b/packages/builders/scripts/fast-usdc/init-fast-usdc.js
index fade01cea83..a25e044e853 100644
--- a/packages/builders/scripts/fast-usdc/init-fast-usdc.js
+++ b/packages/builders/scripts/fast-usdc/init-fast-usdc.js
@@ -17,7 +17,7 @@ import { parseArgs } from 'node:util';
 /**
  * @import {CoreEvalBuilder, DeployScriptFunction} from '@agoric/deploy-script-support/src/externalTypes.js'
  * @import {ParseArgsConfig} from 'node:util'
- * @import {FastUSDCConfig} from '@agoric/fast-usdc/src/types.js'
+ * @import {FastUSDCConfig} from '@agoric/fast-usdc';
  */
 
 const { keys } = Object;
diff --git a/packages/client-utils/src/types.d.ts b/packages/client-utils/src/types.d.ts
index fc11550bbf5..66b25c755e7 100644
--- a/packages/client-utils/src/types.d.ts
+++ b/packages/client-utils/src/types.d.ts
@@ -10,6 +10,7 @@ import type {
   CurrentWalletRecord,
   UpdateRecord,
 } from '@agoric/smart-wallet/src/smartWallet.js';
+import type { ContractRecord, PoolMetrics } from '@agoric/fast-usdc';
 
 // For static string key types. String template matching has to be in the ternary below.
 type PublishedTypeMap = {
@@ -34,4 +35,12 @@ export type TypedPublished<T extends string> = T extends keyof PublishedTypeMap
           ? OutcomeRecord
           : T extends `vaultFactory.managers.manager${number}.metrics`
             ? VaultManagerMetrics
-            : unknown;
+            : T extends 'agoricNames.instance'
+              ? Array<[string, Instance]>
+              : T extends 'agoricNames.brand'
+                ? Array<[string, Brand]>
+                : T extends 'fastUsdc'
+                  ? ContractRecord
+                  : T extends 'fastUsdc.poolMetrics'
+                    ? PoolMetrics
+                    : unknown;
diff --git a/packages/fast-usdc/package.json b/packages/fast-usdc/package.json
index 30e20a49253..9816516b698 100644
--- a/packages/fast-usdc/package.json
+++ b/packages/fast-usdc/package.json
@@ -8,6 +8,7 @@
     "src",
     "tools"
   ],
+  "main": "src/main.js",
   "bin": {
     "fast-usdc": "./src/cli/bin.js"
   },
diff --git a/packages/fast-usdc/src/cli/lp-commands.js b/packages/fast-usdc/src/cli/lp-commands.js
index afcbd063650..246d13bb19b 100644
--- a/packages/fast-usdc/src/cli/lp-commands.js
+++ b/packages/fast-usdc/src/cli/lp-commands.js
@@ -142,7 +142,6 @@ export const addLPCommands = (
       const usdcAmount = parseUSDCAmount(opts.amount, usdc);
 
       /** @type {import('../types.js').PoolMetrics} */
-      // @ts-expect-error it treats this as "unknown"
       const metrics = await swk.readPublished('fastUsdc.poolMetrics');
       const fastLPAmount = ceilDivideBy(usdcAmount, metrics.shareWorth);
 
diff --git a/packages/fast-usdc/src/fast-usdc.contract.js b/packages/fast-usdc/src/fast-usdc.contract.js
index 80f8c4a6df1..4b5bae9bd23 100644
--- a/packages/fast-usdc/src/fast-usdc.contract.js
+++ b/packages/fast-usdc/src/fast-usdc.contract.js
@@ -38,7 +38,7 @@ const ADDRESSES_BAGGAGE_KEY = 'addresses';
  * @import {Marshaller, StorageNode} from '@agoric/internal/src/lib-chainStorage.js'
  * @import {Zone} from '@agoric/zone';
  * @import {OperatorKit} from './exos/operator-kit.js';
- * @import {CctpTxEvidence, FeeConfig} from './types.js';
+ * @import {CctpTxEvidence, ContractRecord, FeeConfig} from './types.js';
  */
 
 /**
@@ -76,10 +76,7 @@ const publishFeeConfig = async (node, marshaller, feeConfig) => {
 
 /**
  * @param {Remote<StorageNode>} contractNode
- * @param {{
- *  poolAccount: ChainAddress['value'];
- *  settlementAccount: ChainAddress['value'];
- * }} addresses
+ * @param {ContractRecord} addresses
  */
 const publishAddresses = (contractNode, addresses) => {
   return E(contractNode).setValue(JSON.stringify(addresses));
diff --git a/packages/fast-usdc/src/main.js b/packages/fast-usdc/src/main.js
new file mode 100644
index 00000000000..d4702960d54
--- /dev/null
+++ b/packages/fast-usdc/src/main.js
@@ -0,0 +1 @@
+export * from './types.js';
diff --git a/packages/fast-usdc/src/types.ts b/packages/fast-usdc/src/types.ts
index 0d3701e9d82..2e4aea441ec 100644
--- a/packages/fast-usdc/src/types.ts
+++ b/packages/fast-usdc/src/types.ts
@@ -43,6 +43,11 @@ export interface TransactionRecord extends CopyRecord {
   status: TxStatus;
 }
 
+export interface ContractRecord extends CopyRecord {
+  poolAccount: ChainAddress['value'];
+  settlementAccount: ChainAddress['value'];
+}
+
 export type LogFn = (...args: unknown[]) => void;
 
 export interface PendingTx extends CctpTxEvidence {
diff --git a/packages/fast-usdc/src/utils/deploy-config.js b/packages/fast-usdc/src/utils/deploy-config.js
index 7b160a7996c..b1688d441a7 100644
--- a/packages/fast-usdc/src/utils/deploy-config.js
+++ b/packages/fast-usdc/src/utils/deploy-config.js
@@ -2,7 +2,7 @@ import { denomHash, withChainCapabilities } from '@agoric/orchestration';
 import fetchedChainInfo from '@agoric/orchestration/src/fetched-chain-info.js';
 
 /**
- * @import {FastUSDCConfig} from '@agoric/fast-usdc/src/types.js'
+ * @import {FastUSDCConfig} from '@agoric/fast-usdc';
  * @import {Passable} from '@endo/marshal';
  * @import {CosmosChainInfo, Denom, DenomDetail} from '@agoric/orchestration';
  */