diff --git a/packages/inter-protocol/src/auction/auctionBook.js b/packages/inter-protocol/src/auction/auctionBook.js
index e961e6ab0c83..4ba8ae4d1e77 100644
--- a/packages/inter-protocol/src/auction/auctionBook.js
+++ b/packages/inter-protocol/src/auction/auctionBook.js
@@ -2,7 +2,7 @@ import '@agoric/governance/exported.js';
 import '@agoric/zoe/exported.js';
 import '@agoric/zoe/src/contracts/exported.js';
 
-import { AmountMath } from '@agoric/ertp';
+import { AmountMath, AmountShape, RatioShape } from '@agoric/ertp';
 import { mustMatch } from '@agoric/store';
 import {
   M,
@@ -104,6 +104,18 @@ export const makeOfferSpecShape = (bidBrand, collateralBrand) => {
  *    added in.)
  * @property {Amount<'nat'> | null}      collateralAvailable The amount of collateral remaining
  */
+export const BookDataNotificationShape = M.splitRecord(
+  {
+    startPrice: M.or(RatioShape, null),
+    currentPriceLevel: M.or(RatioShape, null),
+    startCollateral: AmountShape,
+    collateralAvailable: M.or(AmountShape, null),
+  },
+  {
+    proceedsRaised: AmountShape,
+  },
+);
+harden(BookDataNotificationShape);
 
 /**
  * @typedef {object} ScaledBidData
@@ -127,6 +139,11 @@ export const makeOfferSpecShape = (bidBrand, collateralBrand) => {
  * @property {Array<ScaledBidData>} scaledBids
  * @property {Array<PricedBidData>} pricedBids
  */
+export const BidDataNotificationShape = {
+  scaledBids: M.arrayOf(M.any()),
+  pricedBids: M.arrayOf(M.any()),
+};
+harden(BidDataNotificationShape);
 
 /**
  * @param {Baggage} baggage
@@ -203,13 +220,13 @@ export const prepareAuctionBook = (baggage, zcf, makeRecorderKit) => {
       const bookDataKit = makeRecorderKit(
         bookNode,
         /** @type {import('@agoric/zoe/src/contractSupport/recorder.js').TypedMatcher<BookDataNotification>} */ (
-          M.any()
+          BookDataNotificationShape
         ),
       );
       const bidsDataKit = makeRecorderKit(
         bidsNode,
         /** @type {import('@agoric/zoe/src/contractSupport/recorder.js').TypedMatcher<BidDataNotification>} */ (
-          M.any()
+          BidDataNotificationShape
         ),
       );
 
diff --git a/packages/inter-protocol/src/auction/auctioneer.js b/packages/inter-protocol/src/auction/auctioneer.js
index bc1ff1bcb954..602bd1917287 100644
--- a/packages/inter-protocol/src/auction/auctioneer.js
+++ b/packages/inter-protocol/src/auction/auctioneer.js
@@ -21,9 +21,9 @@ import {
   makeRatioFromAmounts,
   makeRecorderTopic,
   natSafeMath,
+  offerTo,
   prepareRecorder,
   provideEmptySeat,
-  offerTo,
 } from '@agoric/zoe/src/contractSupport/index.js';
 import { FullProposalShape } from '@agoric/zoe/src/typeGuards.js';
 import { E } from '@endo/eventual-send';
@@ -32,7 +32,7 @@ import { Far } from '@endo/marshal';
 import { makeNatAmountShape } from '../contractSupport.js';
 import { makeOfferSpecShape, prepareAuctionBook } from './auctionBook.js';
 import { auctioneerParamTypes } from './params.js';
-import { makeScheduler } from './scheduler.js';
+import { makeScheduler, ScheduleNotificationShape } from './scheduler.js';
 import { AuctionState } from './util.js';
 
 /** @typedef {import('@agoric/vat-data').Baggage} Baggage */
@@ -428,7 +428,7 @@ export const start = async (zcf, privateArgs, baggage) => {
   const scheduleKit = makeERecorderKit(
     E(privateArgs.storageNode).makeChildNode('schedule'),
     /** @type {import('@agoric/zoe/src/contractSupport/recorder.js').TypedMatcher<import('./scheduler.js').ScheduleNotification>} */ (
-      M.any()
+      ScheduleNotificationShape
     ),
   );
 
diff --git a/packages/inter-protocol/src/auction/scheduler.js b/packages/inter-protocol/src/auction/scheduler.js
index 2d3737b53847..51a8306c1122 100644
--- a/packages/inter-protocol/src/auction/scheduler.js
+++ b/packages/inter-protocol/src/auction/scheduler.js
@@ -1,9 +1,10 @@
 import { E } from '@endo/eventual-send';
-import { TimeMath } from '@agoric/time';
+import { TimeMath, TimestampShape } from '@agoric/time';
 import { Far } from '@endo/marshal';
 import { makeTracer } from '@agoric/internal';
 import { observeIteration, subscribeEach } from '@agoric/notifier';
 
+import { M } from '@agoric/store';
 import { AuctionState, makeCancelTokenMaker } from './util.js';
 import {
   computeRoundTiming,
@@ -56,6 +57,12 @@ const makeCancelToken = makeCancelTokenMaker('scheduler');
  * @property {Timestamp | null} nextDescendingStepTime when the next descending step
  *    will take place
  */
+export const ScheduleNotificationShape = {
+  activeStartTime: M.or(null, TimestampShape),
+  nextStartTime: M.or(null, TimestampShape),
+  nextDescendingStepTime: M.or(null, TimestampShape),
+};
+harden(ScheduleNotificationShape);
 
 const safelyComputeRoundTiming = (params, baseTime) => {
   try {