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Certificate and domain expiry alerts for web agencies
Watch every client website's security certificate and domain for web agencies, and warn before anything expires.
01The idea
What you'd build
Website security certificates must now be renewed far more often: new ones last at most 200 days since March 2026, and 47 days by 2029. Build a simple tool for web agencies: add 30–300 client sites, and it warns before a certificate or domain expires, checks that auto-renewal worked, and sends a monthly report for clients. About $9–29 a month (estimate).
Why now: Certificates now last at most 200 days (since 15 Mar 2026), dropping to 100 days in Mar 2027, so renewals happen more often.
02Demand
Is anyone asking for this?
An idea is only worth your time if real people want it. Here's what we found.
- The industry body for website certificates set new limits: at most 200 days from 15 Mar 2026, 100 days from 15 Mar 2027, and 47 days from 15 Mar 2029.
- One one-person monitoring service reports about $22,600 a month from 1,034 paying accounts (Aug 2026), after 11 years.
- A blog tracking outages reported an expired certificate took down a large software project for 13 hours in 2026.
03The gap
Why isn't this solved already?
Big monitoring tools do everything and charge per check. Agencies with many client sites want one simple list: what expires when, did renewal work, and a report they can forward to clients.
04The pain point
What hurts, and when
When a client's certificate or domain expires, the site shows a scary warning or goes offline, and the agency gets the angry call. Shorter certificates mean more renewals that can quietly fail.
😣 When it hurts: After a client's site shows a security warning on a Monday morning.
05Who needs this
The person you'd build for
- 👤Who they are
- Small web agencies and freelancers who look after 20–300 client sites.
- 🧰What they use today
- Calendar reminders, spreadsheets, or big monitoring tools priced per check.
- 📍Where to find them
- Web agency communities, hosting and server forums, and searches like "ssl certificate expiry monitoring".
- 💳Why they'd pay
- One angry client costs more than a year of the tool. One one-person monitor earns ~$22,600 a month from small accounts.
06AI score
How much AI can do
🤖 AI does
- Builds the tool, the pages and the listing
- Runs checks and fixes problems
- Writes posts, emails and replies for you to check
- Turns your numbers into a weekly note
🙋 You do
- Make the accounts and pass ID checks
- Approve what AI makes
- Post, send and talk to buyers
- Handle the money, tax and decisions
AI can also prepare the selling and marketing work: posts, emails and replies. But a person has to do it: post, send and talk to buyers.
How hard is it? Medium.
07Your AI
What to have your AI do
Use any AI assistant you like. One paid plan (~$20 a month) is usually enough. Here's what to have it do:
Search the web for people asking for this, and list who already sells it and their weak spots.
Write the tool step by step, test it, and explain anything you need to do by hand.
Write your website, store listing and help pages in plain words, with no income claims.
Draft posts, emails and replies. You edit them, then post and send them yourself.
Keep your FAQ and refund rules in one saved chat or project, so every reply follows them.
Re-run the tests, check for changes, and turn your weekly numbers into a short note.
08Tools
The other tools you'll need
Your AI plus a few everyday tools. Costs are estimates.
The main AI engine to run your business
~$0–20 a month (estimate)Your own web address, like yourname.com
~$10–15 a year (estimate)Runs the daily checks and your sales page
~$5–10 a month (estimate)Public registration dates for each domain
Free (with limits)Sends alerts and monthly reports
~$0–15 a month (estimate)Monthly subscriptions
~3–5% of each payment (estimate)Warns you if your checker stops
Free planThe playbook
How to do it, step by step: proof, where to find buyers, the money math, and a prompt for each step.
09Proof
Has anyone made money from this?
🔒 Sections 09–17 are locked
Read the full playbook
10Marketing
Where to find buyers, and a 7-day launch
11Risks
What could go wrong, and what to do
12Your time
How much of your week it takes
13Setup
Step by step, with your AI
14Budget
What it costs
15Money math
Low, middle and high (estimates)
16Stop rule
When to stop
17Prompt pack
Copy the prompt. Paste it into your AI.
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This report is based on outside sources and our own research. All numbers are estimates. It is not financial advice. Results depend on you, and no income is promised.