Brian Mangum

September 12, 2026 · ~/blog

I shipped a Grok Bot that autopsies my SaaS wallet

Receipt Reaper autopsy report, About tab

I keep paying for tools I forgot I bought.

Last week I canceled a couple. The cancel mail showed up. The receipts were still in Gmail. Nothing in my bank feed was going to narrate that story for me.

So I built Receipt Reaper — a Grok Bot that reads billing mail (archive included), buckets what it finds, and opens an HTML autopsy.

What it does

  1. Connect Gmail (read-only).
  2. Search receipts and cancel confirmations. Cancel mail beats an older receipt.
  3. Ship one self-contained HTML file: Dashboard / To cancel / Canceled / About.
  4. Optional cancel-hunt: it walks you to the door and stops before the irreversible click.

It never invents amounts or cancel URLs. If mail does not have a cancel link, the button says manage in account.

Live run — Sep 12, 2026

I pointed it at my own inbox around 10:04 AM ET.

Receipt Reaper wallet autopsy dashboard

Nine accounts still looking live. Two high urgency. Fifteen already quiet. Top annuals in the shot were about $443/yr if those stayed.

Receipt Reaper To cancel list with the high urgency subscriptions

The kill list that morning: X Premium Plus and SuperGrok Heavy. Both “Manage in account” — no cancel URL in those receipts.

Receipt Reaper Canceled list of subscriptions that went quiet

Cancel-confirmation search mattered. Synthesia had cancel mail that day. HeyGen and OpusClip did not — I confirmed those quiet myself and the Bot recorded that honestly.

Why a Bot, not a spreadsheet

I already live in Grok Bot. Skills stick. A monthly renew watch can sit on a clock. Publishing a template means someone else can install the same job without inheriting my mailbox.

I published it as a public template on Sep 12, 2026. The share link works today. The official marketplace shelf is still curated — so the link is the real distribution until xAI lists it.

Hard rules I baked in

  • Read-only. No cancel / send / trash from the Bot.
  • No invent. No secrets in the HTML.
  • Real local audit stamp. Never leave a demo 9:00 AM.
  • Archive is included. Never in:inbox-only.

Try it

Add the Bot from the public share link. Connect Gmail. Run first-run, then the autopsy skill. If something looks killable, use Hunt cancel — and say yes before anything dies.

I built this for me. If it saves you one forgotten annual, that is enough.

If you like it, let me know. If you can think of a feature to add, let me know