GLOBAL X TECHNOLOGYPostMaster
Android pilot · Private backend

Take the photos.
Keep selling.

Turn item photos into marketplace listing drafts. PostMaster captures on your phone while GXT Sell handles the work behind the scenes, connected through Tailscale.

Request pilot accessExplore the workflow
Android capturePrivate connectivityOne listing queue
POSTMASTER / WORKFLOWInteractive demo
01 / CAPTURE

A few photos. One item.

Capture the front, details and condition. The phone keeps you moving to the next item.

Ready to capture

Illustrative workflow. This demo does not upload photos or create listings.

Capture on AndroidConnect with TailscalePrepare in GXT SellTrack from your dashboard
How it works

Less switching.
A clearer path to a listing.

Your phone is the starting point. Your private backend carries the work forward.

01 / CAPTURE

Photograph the real item

Collect photos and condition details on Android. Queue the item, then keep capturing without moving through marketplace forms.

02 / PREPARE

Build the listing draft

GXT Sell receives your item through the private connection and prepares it for the marketplace workflow.

03 / MONITOR

Know what happened next

Use the private dashboard to follow the queue and marketplace status. A draft and a completed post are shown as different stages.

See PostMaster in use

Screenshots from the running Android app. Open either image for a closer look.

Start with your phone: Current Android pilot: camera screen with Gallery, capture and Done controls. The camera is idle in this capture.
Start with your phoneCurrent Android pilot: camera screen with Gallery, capture and Done controls. The camera is idle in this capture.
Review the queue and posting status: Current Android pilot: item cards show drafts and marketplace steps that still need attention. Example items and prices are shown as captured.
Review the queue and posting statusCurrent Android pilot: item cards show drafts and marketplace steps that still need attention. Example items and prices are shown as captured.
Private connectivity

PostMaster + Tailscale

Your phone reaches your backend over your own private network, at home or away.

For the current pilot, keep Tailscale connected on both your phone and the backend computer. Tailscale setup is separate from the Android app.

Explore the same approach in SessionVault
Marketplace paths

One capture flow.
Each marketplace’s own final step.

The pilot prepares drafts for four marketplaces. Posting follows each marketplace’s supported workflow.

eBay

Official OAuth and Sell API workflow for connected accounts. Confirm the result in your dashboard.

Official API path

OfferUp

Prepare the listing, then complete the final posting step yourself.

Manual final tap

Facebook Marketplace

Move from a prepared draft to your own marketplace posting flow.

Manual final tap

Craigslist

Use the prepared details and complete the final posting step.

Manual final tap
Pilot setup

Connect once.
Then follow the queue.

PostMaster is an Android pilot, not a public app-store release. GXT can walk you through access and setup.

Ask about setup
  1. 01Get the approved Android pilot app and your backend connection details from GXT.
  2. 02Set up Tailscale on the phone and backend, then confirm that both are connected.
  3. 03Capture a test item and confirm that it appears in your private dashboard.
  4. 04Connect the marketplace accounts you intend to use and follow the appropriate posting steps.
Explore with PlayPage

A little play.
A useful answer.

Jump into a product topic, ask the FAQ helper, or take a break with three mini arcade games. Use the PlayPage button at the bottom of the page.

The helper uses prepared product answers. Game scores stay in this browser.

Learn about PlayPage
Questions, answered

Before your first item.

Can I download PostMaster from the app store?

Not yet. PostMaster is an Android pilot. Contact GXT for access and setup information.

Do I need Tailscale when I am at home?

Yes, for the current pilot connection. Keep Tailscale connected on your phone and backend computer, even when both are on your home network.

Does Tailscale post my listings?

No. Tailscale supplies private connectivity. PostMaster captures the item and GXT Sell handles preparation and marketplace workflows.

Does every marketplace post automatically?

No. The eBay workflow uses its official API path. OfferUp, Facebook Marketplace and Craigslist require a manual final posting step.

How do I know that a listing was posted?

Check the marketplace status in your private GXT Sell dashboard and follow the listing link when one is available. A queued item or prepared draft is not confirmation of a completed post.

Is this the same as SessionVault?

No. PostMaster handles resale-item capture and listing workflows. SessionVault stores shared AI history and context. Both use private connectivity to reach services on your hardware.

GXT PostMaster

Put your next item
into motion.

Talk with GXT about the Android pilot and the setup that fits your workflow.

Request pilot accessContact GXT