diff --git a/packages/cosmic-swingset/lib/ag-solo/vats/captp.js b/packages/cosmic-swingset/lib/ag-solo/vats/captp.js
new file mode 100644
index 00000000000..ad8fa1eccf2
--- /dev/null
+++ b/packages/cosmic-swingset/lib/ag-solo/vats/captp.js
@@ -0,0 +1,49 @@
+// Avoid importing the full captp bundle, which would carry
+// in its own makeHardener, etc.
+import { makeCapTP } from '@agoric/captp/lib/captp';
+import harden from '@agoric/harden';
+
+export const getCapTPHandler = (E, sendMulticast, getBootstrapObject) => {
+  const conns = new Map();
+  const handler = harden({
+    onConnect(_obj, meta) {
+      const { connectionHandle, origin = 'unknown' } = meta || {};
+      console.info(`Starting CapTP`, meta);
+      const sendObj = o => {
+        sendMulticast(o, [connectionHandle]);
+      };
+      const { dispatch, abort } = makeCapTP(
+        origin,
+        sendObj,
+        getBootstrapObject,
+      );
+      conns.set(connectionHandle, [dispatch, abort]);
+    },
+    onDisconnect(_obj, meta) {
+      console.log(`Finishing CapTP`, meta);
+      const dispatchAbort = conns.get(meta.connectionHandle);
+      if (dispatchAbort) {
+        (1, dispatchAbort[1])();
+      }
+      conns.delete(meta.connectionHandle);
+    },
+    onError(obj, meta) {
+      console.log(`Error in CapTP`, meta, obj.error);
+    },
+    onMessage(obj, meta) {
+      console.error('processing inbound', obj);
+      const dispatchAbort = conns.get(meta.connectionHandle);
+      if (!dispatchAbort || !(1, dispatchAbort[0])(obj)) {
+        console.error(`Could not find CapTP handler ${obj.type}`, meta);
+        return false;
+      }
+      return true;
+    },
+  });
+
+  return harden({
+    getCommandHandler() {
+      return handler;
+    },
+  });
+};
diff --git a/packages/cosmic-swingset/package.json b/packages/cosmic-swingset/package.json
index fb35ae41ac3..a1ea14928f4 100644
--- a/packages/cosmic-swingset/package.json
+++ b/packages/cosmic-swingset/package.json
@@ -30,6 +30,7 @@
     "@agoric/registrar": "^0.0.1",
     "@agoric/same-structure": "^0.0.1",
     "@agoric/sharing-service": "^0.0.1",
+    "@agoric/spawner": "^0.0.3",
     "@agoric/store": "^0.0.1",
     "@agoric/swing-store-simple": "^0.1.0",
     "@agoric/swingset-vat": "^0.3.0",