Website Monitoring for Agencies: Uptime Monitoring That Watches Every Client Website
Add all your client sites to one account, set the check interval to 60 seconds, and let TrackDowntime call your phone the moment one of them stops responding. You find out first. The client hears it from you, not from their customers.
25 endpoints on Professional at $99 a month. Email, SMS and phone call alerts included, with no per-alert fees.
Paste the URL, create your account, and the first check runs right away.
How agencies monitor client websites
Agencies monitor client websites by putting every client URL into one external monitoring account, checking each one every 60 seconds from outside the client's own hosting, and routing the alert to whoever is on call rather than to the client. The point is order of discovery: the agency that finds the outage first controls the conversation. TrackDowntime does that job for 5, 25 or an unlimited number of endpoints depending on plan, and it escalates by phone call when nobody acknowledges.
Last updated September 2026
What agency website monitoring has to do that single-site monitoring does not
A freelancer with one site needs an email. An agency with thirty client sites needs a system that survives being asleep, on a plane, or in a client meeting.
Every client site in one list
One dashboard, one login, one place to look on a Monday morning. Each endpoint carries its own status, last response time and uptime percentage, so you can scan a portfolio in a few seconds instead of opening thirty tabs.
Phone call alerts, not just email
Email fails at 3am. TrackDowntime places an automated voice call when an endpoint goes down. The calls come from a fixed number, so you can whitelist it for emergency bypass and still get the call through Do Not Disturb.
Escalation until somebody acts
Alerts repeat on a backing off schedule for as long as the site stays down, then send a separate recovery notification when it comes back. An outage that starts while you are driving is still waiting for you when you park.
Response time trends per client
Every check stores the response time and the HTTP status code. A client site drifting from 400ms to 2.5s over a fortnight is visible before it turns into a 502, which is the difference between a scheduled fix and an emergency.
Uptime history you can hand to a client
Each endpoint keeps its own uptime record with the incidents that produced it. When a client asks what they pay you for, the answer is a number with dates attached rather than a feeling.
APIs and endpoints, not only homepages
Monitor the checkout URL, the login page, the booking form handler and the API a client's mobile app depends on. A homepage that returns 200 while the payment endpoint is dead is the outage nobody catches.
Setting up monitoring for a client portfolio
List the URLs that matter
For each client, pick the homepage plus the one page that makes them money: checkout, booking, login or the quote form. Two to four endpoints per client is usually the right density.
Add them to one account
Paste each URL into the dashboard. Starter covers 5 endpoints, Professional 25, Enterprise unlimited, so you size the plan to the portfolio rather than buying a seat per client.
Route alerts to the on call person
Set email for low noise, SMS for the shift lead, and phone call for the endpoints where an hour of downtime costs the client real revenue.
Review the report before the client asks
Check the uptime numbers before the monthly call. Walking in with the figure is a different meeting from being asked for it.
Why the client should never be the one who tells you
The retention math on agency retainers is brutally simple. A client who emails you "is the site down?" has already lost trust, because in that moment they know something about their own business that you did not. Two or three of those and the retainer conversation gets harder every quarter.
External monitoring inverts that. When a check fails, the alert reaches you within about a minute, and the message the client gets is yours: what broke, what you are doing, when it will be back. Same outage, completely different relationship. This is the whole reason agencies pay for monitoring they could technically get for free on a personal plan, and it is why escalating phone call alerts matter more than another dashboard widget.
It also has to run outside the client's own infrastructure. Monitoring installed on the same server it is watching goes down with the server, which means the one moment you needed it is the one moment it stayed quiet.
What a portfolio actually costs to monitor
Per site pricing is the number to run before you pick a tool, because agency portfolios grow and most monitoring pricing is built around a single company watching its own stack.
At 25 client endpoints on the Professional plan, TrackDowntime works out at roughly $4 per endpoint per month, with phone calls, SMS and email included rather than metered. At 60 endpoints on Enterprise it is closer to $5 each, and at 150 it is under $2. If you bill a maintenance retainer, monitoring is usually a rounding error inside it, and several agencies simply list it as a line item on the retainer. Full numbers are on the pricing page.
Two costs are easier to miss. The first is per alert SMS charges, which some vendors bill by the message and which spike exactly when you are having a bad week. The second is seats: tools that price by team member get expensive the moment a second developer needs to see the dashboard.
How many endpoints per client is right
Most agencies over monitor a few clients and under monitor the rest. A workable default is the homepage plus the revenue path, then one more if the client depends on an API or a scheduled job.
- Brochure site: homepage only, sometimes the contact form handler.
- Ecommerce: homepage, category page, cart or checkout URL. Checkout is the one that matters.
- Booking or lead generation: homepage plus the form submission endpoint, because a broken form is a silent outage that keeps returning 200.
- SaaS or app clients: the marketing site, the login page, and the API base URL the app calls.
That density puts a typical thirty client agency somewhere between 45 and 70 endpoints, which is an Enterprise conversation rather than a Professional one. Sizing it honestly up front avoids the awkward month where you quietly stop monitoring the smaller clients.
What TrackDowntime does not do
Worth saying plainly, because agency buyers get burned by feature lists. TrackDowntime does not currently offer white label status pages on a client subdomain, and it does not have per client sub accounts with separate client logins. If a branded status page at status.clientsite.com is the reason you are shopping, other tools do that specifically and you should buy one of those.
What it does do is catch the outage and get a human on the phone about it, across a whole portfolio, without per alert billing. For most agencies that is the part that actually protects the retainer.
Who this is built for
Web design and WordPress agencies
You built the site, you host or manage it, and you carry the blame when it breaks. Monitoring turns a support surprise into a maintenance retainer you can justify at renewal.
Freelancers with a maintenance book
Ten or fifteen client sites on a care plan is exactly the range where Starter or Professional pays for itself the first time you catch an expired plugin conflict before the client opens their laptop.
MSPs and IT consultancies
Client web properties sit alongside the infrastructure you already watch. Adding external HTTP checks and an escalating voice call closes the gap between a server being up and a site actually serving.
Agency monitoring plans compared
Prices below are the published US list prices as of September 2026. Check each vendor before you buy, because monitoring pricing moves.
| Plan or tool | Monthly price | Endpoints | Check interval | Phone call alerts |
|---|---|---|---|---|
| TrackDowntime Starter | $29 ($14 annual) | 5 | 5 minutes | No |
| TrackDowntime Professional | $99 ($49 annual) | 25 | 60 seconds | Yes |
| TrackDowntime Enterprise | $299 ($149 annual) | Unlimited | 60 seconds | Yes |
| UptimeRobot Solo | $10 ($9 annual) | 10 to 50 | 60 seconds | No |
| UptimeRobot Team | $45 ($38 annual) | 100 | 60 seconds | No |
| StatusCake Superior | $24.99 | Tiered | Sub minute on higher tiers | No |
| Pingdom (synthetic entry) | From $16.50 annual | 10 uptime checks | 60 seconds | No |
TrackDowntime is not the cheapest option on this table and is not trying to be. It is priced for portfolios where an hour of unnoticed downtime costs more than the subscription.
Questions agencies ask before they sign up
How do agencies monitor client websites?
Agencies add every client URL to a single external monitoring account, run a check every 60 seconds from outside the client's hosting, and send the alert to their own on call person rather than to the client. The monitoring has to live off the client's server, because monitoring hosted on the machine it watches goes silent in exactly the outage it was bought for.
How many client sites can I monitor on one account?
On TrackDowntime, 5 endpoints on Starter, 25 on Professional and unlimited on Enterprise. Endpoints, not sites, is the unit that matters: a client with a homepage and a checkout URL uses two. Most agencies run two to four endpoints per client, so a 25 endpoint plan comfortably covers about 8 to 12 clients.
How much does website monitoring cost per client site?
Between roughly $2 and $6 per endpoint per month across the main tools at agency volume. TrackDowntime Professional is about $4 per endpoint at 25 endpoints, and Enterprise drops below $2 once you pass 150. The number that moves the total is usually SMS and voice billing, which some vendors meter per alert.
What should an agency monitor on a client site?
The homepage plus the page that makes the client money. For ecommerce that is checkout, for a service business it is the booking or quote form handler, and for app clients it is the API base URL. A homepage returning 200 while the payment endpoint is dead is the outage that gets missed, so monitor the revenue path directly.
How do I prove uptime to a client?
Pull the uptime percentage for the client's endpoints over the billing period along with the individual incidents that produced it, then put it in the monthly report before the client asks. A figure with dates and durations attached ends the argument. Every endpoint in TrackDowntime keeps its own uptime record and response time history for this.
Can I get alerted before the client notices?
Usually yes, at a 60 second check interval. Real visitors tend to notice an outage in the first few minutes on a busy site and much later on a quiet one, so a one minute check normally puts you ahead. Phone call alerts are what close the remaining gap overnight, when email and Slack do not wake anybody.
Do you offer white label status pages for clients?
No. TrackDowntime does not currently provide branded status pages on a client subdomain or separate client logins. If a status page at status.clientsite.com is your main requirement, buy a tool built around that. TrackDowntime is built around catching the outage and reaching a human quickly across a whole portfolio.
Does monitoring work for APIs and not just web pages?
Yes. Any HTTP or HTTPS endpoint that returns a status code can be monitored, so API routes, webhook receivers and health check URLs all work the same way as a homepage. Response time and status code are recorded on every check, which is how you catch an API that is technically up but degrading.
Put every client site on one dashboard tonight
Add your first client URLs, set the check interval, and pick who gets the phone call. Starter covers 5 endpoints at $29 a month, Professional covers 25 at $99 with 60 second checks and voice alerts.
Keep reading
Automated call, SMS and email when a client endpoint fails, with escalation that repeats until it recovers.
Uptime monitoring pricingWhat uptime monitoring costs per site across the main US tools, and which line items catch buyers out.
Plans and pricingStarter, Professional and Enterprise, with endpoint counts, check intervals and alert channels.
Monitoring featuresPhone call alerts, escalation, response time tracking and downtime history.