DNS monitoring for SaaS applications
A growing SaaS product accumulates DNS surface area fast: customer custom domains, transactional email records, and a steady stream of new app and API subdomains. Any one of them can break without anyone noticing right away.
SaaS products have more moving DNS than most sites
Customer-facing custom domains are typically CNAMEs pointed at your platform — if the target changes, or a customer's own record drifts, their storefront or portal breaks and they may reach out to you before you know anything changed. And new app, API, and staging subdomains get created constantly as the product grows, each one a record that can silently change or disappear without anyone deliberately touching it.
CNAMEportal.customer-example.comapp.yoursaas.com→app.yoursaas-old.com
A stale target left over from a rename can break every customer relying on that CNAME pattern.
How OneDollarDNS fits a SaaS DNS footprint
Add a domain and OneDollarDNS automatically discovers common and mail-related hosts, plus anything reachable through your existing CNAME and MX targets, then checks all of them every hour by default. For the handful of hosts where a change is highest-risk — auth callbacks, payment endpoints, primary API gateways — the Frequent Monitoring add-on drops that to 5-minute checks. Bulk zone-file import and provider sync mean adding a domain with dozens of existing subdomains doesn't mean adding them one at a time. The SPF and DKIM records behind your transactional email are watched the same way — see SPF and TXT record monitoring for more on that specifically.
What this doesn't do
OneDollarDNS isn't a replacement for application performance monitoring, uptime checks, or incident management — it complements them by explaining why something broke when the cause is DNS. See how OneDollarDNS compares to broader monitoring platforms.