Business building · Do this yourself

Stop card testing and trial abuse on cheap SaaS plans.

In short: an AI-agent-run business you oversee about an hour a week. Tools cost $30–$175/mo, agent setup is advanced, and our estimate is 25 SaaS founders × $49 = $1,225/mo.

How it makes money: Charge SaaS founders $49/mo to block card testing and trial abuse on cheap plans.

Agent setup: Advanced · Needs custom code (Cursor) and hosting you maintain. How we rate this

Found on Reddit in r/EntrepreneurRideAlong (1 thread).

🔥 9 posts this week · 1 likes

Based on u/ImplementMiserable74 on Reddit (opens in new tab)

Where this came from (Reddit)

Cheap plans and free trials get farmed with stolen cards and VPN signups, and each dispute costs far more than the $9 charge.

The threads (in our words)

Reddit blocks automated reads, so we couldn’t record upvote or comment counts. The business below is our own design inspired by these threads.

Who it’s for

Indie SaaS founders on Stripe with low-priced plans or free trials.

Adapt it to your industry

  • Start with one niche or customer type, then expand.
  • Ask your first 10 customers what they would pay before you build more.
  • Keep a human check on anything sent in a customer’s name.

Step by step

  1. Connect to Stripe events for new customers and charges (read-only plus block actions the founder approves).
  2. Score each signup: card country vs billing vs IP, VPN/proxy signals, velocity per IP and device.
  3. Auto-challenge or hold risky first charges; let clean ones through.
  4. Cap trials per IP and alert on bursts.
  5. Charge a monthly flat fee through Stripe.
  6. Publish a public checklist of signup-fraud basics for SEO.

Ready-to-copy prompt

Here are 20 recent signups with country, IP country and plan [paste]. Flag the risky ones, explain why in one line each, and suggest a rule set that would have blocked them without hurting normal users.

Start with AI

Opens the AI with this guide and the prompt filled in.

Open in ChatGPT (opens in new tab)Open in Claude (opens in new tab)Open in Grok (opens in new tab)
Time
1–3 hoursOur estimate

Your autonomous stack

Autonomy: The app, onboarding, billing and support run without you. Your part: Weekly: read metrics and support escalations, approve changes (about 1 hour).

Every layer an agent-run business needs, in order. Prices are public list prices, checked Oct 16, 2026.

  1. Agent (the brain): Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot runs the business day to day: writes, answers, decides small things and reports to you. Claude Code or Codex are alternatives.
  2. Build and hosting: Cursor (opens in new tab) (Free tier · Plus $8/mo · Premium $30/mo), Vercel hosting (opens in new tab) (Hobby free · Pro $20/mo), Supabase database (opens in new tab) (Free tier · Pro from $25/mo). The product or service your customers use.
  3. Payments: Stripe payments (opens in new tab) (No monthly fee · 2.9% + 30¢ per card payment). Automatic checkout and receipts. Other options: PayPal Checkout (3.49% + 49¢) or Lemon Squeezy (5% + 50¢, handles sales tax).
  4. Customer acquisition: Buffer (scheduled X posts) (opens in new tab) (Free plan (3 channels, 10 queued posts each) · Essentials $5/mo per channel, billed yearly), beehiiv newsletter (opens in new tab) (Free up to 2,500 subscribers), Apollo (find business emails) (opens in new tab) (Free tier · Basic $65/mo). Agent-written SEO pages, scheduled X posts and a weekly newsletter, plus cold email to businesses that follow CAN-SPAM/GDPR (real sender, opt-out link, no bought consumer lists).
  5. Delivery: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). A Grok Bot routine delivers the product or result as soon as someone pays.
  6. Support: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot answers the support inbox; anything unclear is flagged for you.
  7. Monitoring and schedule: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot scheduled routines run each day: send, check for failures, alert you if something breaks.
  8. Analytics: Google Analytics (opens in new tab) (Free). Tracks visits, signups and sales so the agent can report what works.
  9. Human checkpoint: Weekly: read metrics and support escalations, approve changes (about 1 hour).
  10. Price: charge $49 per founder (monthly flat fee). Offer the first 3 customers a founding price for honest feedback.
Monthly cost$30–$175/monthFree tiers → paid plans of the tools above. Card fees come out of each sale.
What you could earn · EstimateEstimate: 25 SaaS founders × $49 = $1,225/moOur estimate, not a fact or a promise. It’s simple math if you land these customers at this price.
Details: source, numbers and tags

What they did

Agents watch new signups and small charges for mismatched countries, VPN use and burst signups, then block or challenge risky ones before disputes pile up. We designed this business from real Reddit threads; it is an idea for you to build, not a description of the posters’ businesses.

How it went

Found on Reddit in r/EntrepreneurRideAlong (1 thread). Upvote and comment counts weren’t retrievable, so none are shown. On X, 9 posts matched our search for this idea in the 7 days to 2026-10-18.

Worth knowing

Follow card-network and Stripe rules; never store raw card numbers yourself; false positives hurt real customers, so start with review queues.

Difficulty
BeginnerOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
Not reportedWe only show revenue the source states
Engagement
No public countThe source shows no number
X buzz
11.2 · 9 posts in 7 days1 likes, 0 reposts, 2 replies, 0 quotes on 1 top posts · fetched Oct 18, 2026 · query: (carder OR carders OR "card testing" OR "trial abuse" OR "signup fraud") (Stripe OR SaaS OR subscription) -is:retweet lang:en

Posted · Added Oct 18, 2026

Original builder recipe

  • ChatGPT
  • Claude
  1. Connect to Stripe events for new customers and charges (read-only plus block actions the founder approves).
  2. Score each signup: card country vs billing vs IP, VPN/proxy signals, velocity per IP and device.
  3. Auto-challenge or hold risky first charges; let clean ones through.
  4. Cap trials per IP and alert on bursts.
  5. Charge a monthly flat fee through Stripe.
  6. Publish a public checklist of signup-fraud basics for SEO.

Tags

Read the original

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