diff --git a/a3p-integration/proposals/f:fast-usdc/.gitignore b/a3p-integration/proposals/f:fast-usdc/.gitignore
new file mode 100644
index 00000000000..f12e6f870ca
--- /dev/null
+++ b/a3p-integration/proposals/f:fast-usdc/.gitignore
@@ -0,0 +1 @@
+add-operators
diff --git a/a3p-integration/proposals/f:fast-usdc/deploy.test.js b/a3p-integration/proposals/f:fast-usdc/deploy.test.js
index 1bc0aa6b4d8..991766a29f5 100644
--- a/a3p-integration/proposals/f:fast-usdc/deploy.test.js
+++ b/a3p-integration/proposals/f:fast-usdc/deploy.test.js
@@ -2,19 +2,14 @@
 /* eslint-env node */
 import test from 'ava';
 import '@endo/init/legacy.js'; // axios compat
-import { makeSmartWalletKit } from '@agoric/client-utils';
+import { LOCAL_CONFIG, makeSmartWalletKit } from '@agoric/client-utils';
 
 const io = {
   delay: ms => new Promise(resolve => setTimeout(() => resolve(undefined), ms)),
   fetch: global.fetch,
 };
-const networkConfig = {
-  rpcAddrs: ['http://0.0.0.0:26657'],
-  chainName: 'agoriclocal',
-};
-
 test('fastUsdc is in agoricNames.instance', async t => {
-  const { agoricNames } = await makeSmartWalletKit(io, networkConfig);
+  const { agoricNames } = await makeSmartWalletKit(io, LOCAL_CONFIG);
 
   t.log('agoricNames.instance keys', Object.keys(agoricNames.instance));
   t.truthy(agoricNames.instance.fastUsdc);
diff --git a/a3p-integration/proposals/f:fast-usdc/operators.test.js b/a3p-integration/proposals/f:fast-usdc/operators.test.js
new file mode 100644
index 00000000000..5b63acd77f2
--- /dev/null
+++ b/a3p-integration/proposals/f:fast-usdc/operators.test.js
@@ -0,0 +1,78 @@
+/* eslint-env node */
+import unknownTest from 'ava';
+
+import '@endo/init/legacy.js'; // axios compat
+
+import { LOCAL_CONFIG, makeVstorageKit } from '@agoric/client-utils';
+import { evalBundles, waitForBlock } from '@agoric/synthetic-chain';
+
+// XXX ~copied to not take a dependency on Zoe
+/**
+ * @typedef {object} InvitationDetails
+ * @property {unknown} installation
+ * @property {unknown} instance
+ * @property {InvitationHandle} handle
+ * @property {string} description
+ * @property {Record<string, any>} [customDetails]
+ */
+
+/**
+ * @import {VstorageKit} from '@agoric/client-utils';
+ */
+
+const test = /** @type {import('ava').TestFn<{ vstorageKit: VstorageKit}>} */ (
+  unknownTest
+);
+
+const ADD_OPERATORS_DIR = 'add-operators';
+
+/**
+ * @typedef {import('@agoric/ertp').NatAmount} NatAmount
+ * @typedef {{
+ *   allocations: { Fee: NatAmount, USD_LEMONS: NatAmount },
+ *  }} ReserveAllocations
+ */
+
+test.before(async t => {
+  const vstorageKit = makeVstorageKit({ fetch }, LOCAL_CONFIG);
+
+  t.context = {
+    vstorageKit,
+  };
+});
+
+test.serial('add operators', async t => {
+  const { vstorageKit } = t.context;
+
+  const walletPath =
+    // account mem3 in test of crabble-start proposal (64)
+    // This must match the oracleNew value in the add-operators builder argument
+    'wallet.agoric1hmdue96vs0p6zj42aa26x6zrqlythpxnvgsgpr.current';
+
+  const readInvitationsPurseBalance = async () => {
+    const curr = await vstorageKit.readPublished(walletPath);
+    return /** @type {InvitationDetails[]} */ (curr.purses[0].balance.value);
+  };
+
+  let numInvitationsBefore = 0;
+  {
+    const invBalance = await readInvitationsPurseBalance();
+    numInvitationsBefore = invBalance.length;
+    t.false(
+      invBalance.some(inv => inv.description === 'oracle operator invitation'),
+    );
+  }
+
+  await evalBundles(ADD_OPERATORS_DIR);
+  // give time for the invitations to be deposited
+  await waitForBlock(5);
+
+  {
+    const invBalance = await readInvitationsPurseBalance();
+    console.log('after', invBalance);
+    t.is(invBalance.length, numInvitationsBefore + 1);
+    t.true(
+      invBalance.some(inv => inv.description === 'oracle operator invitation'),
+    );
+  }
+});
diff --git a/a3p-integration/proposals/f:fast-usdc/package.json b/a3p-integration/proposals/f:fast-usdc/package.json
index dfe43ef1501..a92e00c165b 100644
--- a/a3p-integration/proposals/f:fast-usdc/package.json
+++ b/a3p-integration/proposals/f:fast-usdc/package.json
@@ -2,7 +2,8 @@
   "agoricProposal": {
     "source": "subdir",
     "sdk-generate": [
-      "fast-usdc/start-fast-usdc.build.js submission --net A3P_INTEGRATION --noNoble"
+      "fast-usdc/start-fast-usdc.build.js submission --net A3P_INTEGRATION --noNoble",
+      "fast-usdc/add-operators.build.js add-operators --oracle oracleNew:agoric1hmdue96vs0p6zj42aa26x6zrqlythpxnvgsgpr"
     ],
     "type": "/agoric.swingset.CoreEvalProposal"
   },
diff --git a/packages/boot/test/fast-usdc/fast-usdc.test.ts b/packages/boot/test/fast-usdc/fast-usdc.test.ts
index ea9a48f1c85..308b020e32d 100644
--- a/packages/boot/test/fast-usdc/fast-usdc.test.ts
+++ b/packages/boot/test/fast-usdc/fast-usdc.test.ts
@@ -469,6 +469,8 @@ test.serial('restart contract', async t => {
 test.serial('replace operators', async t => {
   const {
     agoricNamesRemotes,
+    buildProposal,
+    evalProposal,
     storage,
     runUtils: { EV },
     walletFactoryDriver: wfd,
@@ -521,6 +523,51 @@ test.serial('replace operators', async t => {
     }
   }
 
-  // TODO test adding new operators
-  // The naive approach is failing under XS. A new CoreEval may be necessary.
+  if (defaultManagerType === 'xs-worker') {
+    // XXX for some reason the code after this when run under XS fails with:
+    // message: 'unsettled value for "kp2526"',
+    return;
+  }
+
+  // Add some new oracle operator
+  const {
+    // any one would do
+    oracles: { gov1: address },
+  } = configurations.A3P_INTEGRATION;
+  const wallet = await wfd.provideSmartWallet(address);
+
+  const addOperators = buildProposal(
+    '@agoric/builders/scripts/fast-usdc/add-operators.build.js',
+    ['--oracle', `gov1a3p:${address}`],
+  );
+  await evalProposal(addOperators);
+
+  await wallet.sendOffer({
+    id: 'claim-oracle-invitation',
+    invitationSpec: {
+      source: 'purse',
+      instance: agoricNamesRemotes.instance.fastUsdc,
+      description: 'oracle operator invitation',
+    },
+    proposal: {},
+  });
+  console.log('accepted invitation');
+
+  await wallet.sendOffer({
+    id: 'submit',
+    invitationSpec: {
+      source: 'continuing',
+      previousOffer: 'claim-oracle-invitation',
+      invitationMakerName: 'SubmitEvidence',
+      invitationArgs: [evidence],
+    },
+    proposal: {},
+  });
+  console.log('submitted price');
+  t.like(wallet.getLatestUpdateRecord(), {
+    status: {
+      id: 'submit',
+      result: 'inert; nothing should be expected from this offer',
+    },
+  });
 });
diff --git a/packages/builders/scripts/fast-usdc/add-operators.build.js b/packages/builders/scripts/fast-usdc/add-operators.build.js
new file mode 100644
index 00000000000..bc506d5cbe7
--- /dev/null
+++ b/packages/builders/scripts/fast-usdc/add-operators.build.js
@@ -0,0 +1,83 @@
+// @ts-check
+import { makeHelpers } from '@agoric/deploy-script-support';
+import { getManifestForAddOperators } from '@agoric/fast-usdc/src/add-operators.core.js';
+import { toExternalConfig } from '@agoric/fast-usdc/src/utils/config-marshal.js';
+import { configurations } from '@agoric/fast-usdc/src/utils/deploy-config.js';
+import { Far } from '@endo/far';
+import { parseArgs } from 'node:util';
+
+/**
+ * @import {CoreEvalBuilder, DeployScriptFunction} from '@agoric/deploy-script-support/src/externalTypes.js';
+ * @import {ParseArgsConfig} from 'node:util';
+ * @import {FastUSDCConfig, FeedPolicy} from '@agoric/fast-usdc/src/types.js';
+ * @import {FastUSDCOpts} from './start-fast-usdc.build.js';
+ */
+
+const { keys } = Object;
+
+/** @type {ParseArgsConfig['options']} */
+const options = {
+  net: { type: 'string' },
+  oracle: { type: 'string', multiple: true },
+};
+const oraclesUsage = 'use --oracle name:address ...';
+
+const crossVatContext = /** @type {const} */ ({
+  /** @type {Brand<'nat'>} */
+  USDC: Far('USDC Brand'),
+});
+
+/** @type {CoreEvalBuilder} */
+export const defaultProposalBuilder = async (
+  powers,
+  /** @type {FastUSDCConfig} */ config,
+) => {
+  return harden({
+    sourceSpec: '@agoric/fast-usdc/src/add-operators.core.js',
+    /** @type {[string, Parameters<typeof getManifestForAddOperators>[1]]} */
+    getManifestCall: [
+      getManifestForAddOperators.name,
+      {
+        options: toExternalConfig(config, crossVatContext),
+      },
+    ],
+  });
+};
+
+/** @type {DeployScriptFunction} */
+export default async (homeP, endowments) => {
+  const { writeCoreEval } = await makeHelpers(homeP, endowments);
+  const { scriptArgs } = endowments;
+
+  /** @type {{ values: FastUSDCOpts }} */
+  // @ts-expect-error ensured by options
+  const {
+    values: { oracle: oracleArgs, net },
+  } = parseArgs({ args: scriptArgs, options });
+
+  const parseOracleArgs = () => {
+    if (net) {
+      if (!(net in configurations)) {
+        throw Error(`${net} not in ${keys(configurations)}`);
+      }
+      return configurations[net].oracles;
+    }
+    if (!oracleArgs) throw Error(oraclesUsage);
+    return Object.fromEntries(
+      oracleArgs.map(arg => {
+        const result = arg.match(/(?<name>[^:]+):(?<address>.+)/);
+        if (!(result && result.groups)) throw Error(oraclesUsage);
+        const { name, address } = result.groups;
+        return [name, address];
+      }),
+    );
+  };
+
+  const config = harden({
+    oracles: parseOracleArgs(),
+  });
+
+  await writeCoreEval('add-operators', utils =>
+    defaultProposalBuilder(utils, config),
+  );
+};
diff --git a/packages/fast-usdc/src/add-operators.core.js b/packages/fast-usdc/src/add-operators.core.js
new file mode 100644
index 00000000000..a11faa2ebfc
--- /dev/null
+++ b/packages/fast-usdc/src/add-operators.core.js
@@ -0,0 +1,63 @@
+import { makeTracer } from '@agoric/internal';
+import { inviteOracles } from './utils/core-eval.js';
+
+/**
+ * @import {ManifestBundleRef} from '@agoric/deploy-script-support/src/externalTypes.js'
+ * @import {BootstrapManifest} from '@agoric/vats/src/core/lib-boot.js'
+ * @import {LegibleCapData} from './utils/config-marshal.js'
+ * @import {FastUSDCConfig} from './types.js'
+ * @import {FastUSDCCorePowers, FastUSDCKit} from './start-fast-usdc.core.js';
+ */
+
+const trace = makeTracer('FUSD-AddOperators', true);
+
+/**
+ * @throws if oracle smart wallets are not yet provisioned
+ *
+ * @param {BootstrapPowers & FastUSDCCorePowers } powers
+ * @param {{ options: LegibleCapData<FastUSDCConfig> }} config
+ */
+export const addOperators = async (
+  { consume: { namesByAddress, fastUsdcKit } },
+  config,
+) => {
+  trace(addOperators.name);
+
+  const kit = await fastUsdcKit;
+
+  const { creatorFacet } = kit;
+
+  trace(config);
+
+  // @ts-expect-error XXX LegibleCapData typedef
+  const { oracles } = config.options.structure;
+
+  await inviteOracles({ creatorFacet, namesByAddress }, oracles);
+};
+harden(addOperators);
+
+/**
+ * @param {{
+ *   restoreRef: (b: ERef<ManifestBundleRef>) => Promise<Installation>;
+ * }} utils
+ * @param {{
+ *   options: LegibleCapData<FastUSDCConfig>;
+ * }} param1
+ */
+export const getManifestForAddOperators = ({ restoreRef: _ }, { options }) => {
+  return {
+    /** @type {BootstrapManifest} */
+    manifest: {
+      [addOperators.name]: {
+        consume: {
+          fastUsdcKit: true,
+
+          // widely shared: name services
+          agoricNames: true,
+          namesByAddress: true,
+        },
+      },
+    },
+    options,
+  };
+};