diff --git a/packages/captp/lib/captp.js b/packages/captp/lib/captp.js
index 4fb711299a7..817aa5bab73 100644
--- a/packages/captp/lib/captp.js
+++ b/packages/captp/lib/captp.js
@@ -9,8 +9,14 @@ import { isPromise } from '@agoric/produce-promise';
 
 export { E, HandledPromise, Nat };
 
-export function makeCapTP(ourId, send, bootstrapObj = undefined) {
+export function makeCapTP(ourId, rawSend, bootstrapObj = undefined) {
   let unplug = false;
+  function send(...args) {
+    if (unplug) {
+      throw unplug;
+    }
+    return rawSend(...args);
+  }
 
   // convertValToSlot and convertSlotToVal both perform side effects,
   // populating the c-lists (imports/exports/questions/answers) upon
@@ -253,7 +259,6 @@ export function makeCapTP(ourId, send, bootstrapObj = undefined) {
     // Pull the plug!
     CTP_ABORT(obj) {
       const { exception } = obj;
-      unplug = true;
       for (const pr of questions.values()) {
         pr.rej(exception);
       }
@@ -261,6 +266,7 @@ export function makeCapTP(ourId, send, bootstrapObj = undefined) {
         pr.rej(exception);
       }
       send(obj);
+      unplug = exception;
     },
   };
 
diff --git a/packages/captp/lib/index.js b/packages/captp/lib/index.js
new file mode 100644
index 00000000000..dc204a3e951
--- /dev/null
+++ b/packages/captp/lib/index.js
@@ -0,0 +1,8 @@
+import harden from '@agoric/harden';
+import Nat from '@agoric/nat';
+
+export * from '@agoric/eventual-send';
+export * from '@agoric/marshal';
+
+export * from './captp';
+export { harden, Nat };
diff --git a/packages/cosmic-swingset/lib/ag-solo/vats/captp.js b/packages/cosmic-swingset/lib/ag-solo/vats/captp.js
index f906f0881f9..dcce6f3a7b4 100644
--- a/packages/cosmic-swingset/lib/ag-solo/vats/captp.js
+++ b/packages/cosmic-swingset/lib/ag-solo/vats/captp.js
@@ -4,7 +4,7 @@
 // in its own makeHardener, etc.
 import { makeCapTP } from '@agoric/captp/lib/captp';
 
-export const getCapTPHandler = (E, send, getBootstrapObject) => {
+export const getCapTPHandler = (send, getBootstrapObject, powers) => {
   const chans = new Map();
   const handler = harden({
     onOpen(_obj, meta) {
@@ -17,6 +17,7 @@ export const getCapTPHandler = (E, send, getBootstrapObject) => {
         origin,
         sendObj,
         getBootstrapObject,
+        { harden, ...powers },
       );
       chans.set(channelHandle, [dispatch, abort]);
     },
diff --git a/packages/cosmic-swingset/lib/ag-solo/vats/vat-http.js b/packages/cosmic-swingset/lib/ag-solo/vats/vat-http.js
index 8237d81a736..c3f7d7f93b1 100644
--- a/packages/cosmic-swingset/lib/ag-solo/vats/vat-http.js
+++ b/packages/cosmic-swingset/lib/ag-solo/vats/vat-http.js
@@ -74,9 +74,11 @@ export function buildRootObject(vatPowers) {
 
         // Assign the captp handler.
         // TODO: Break this out into a separate vat.
-        const captpHandler = getCapTPHandler(E, send, () =>
+        const captpHandler = getCapTPHandler(
+          send,
           // Harden only our exported objects.
-          harden(exportedToCapTP),
+          () => harden(exportedToCapTP),
+          { E, harden, ...vatPowers },
         );
         registerURLHandler(captpHandler, '/private/captp');
       }