Experience seamless dual-stack monitoring for both IPv4 and IPv6 without any configuration at the same cost. Users can adjust the check frequency to as low as every 15 seconds, and receive notifications through various channels including SMS, Webhook, Zapier, Telegram, Statuspage, and Slack or compatible platforms. The service offers multilingual reports on availability and performance metrics. Payment options include Bitcoin, altcoins, PayPal, and credit cards. Downtime incidents are verified from eight different locations to ensure accuracy. Additionally, developers can leverage the REST and Webhook APIs to integrate updown.io into their applications. Instead of just tracking standard HTTP status codes, users can also monitor the presence of specific strings. Alerts will be sent out for invalid or soon-to-expire certificates to help maintain website security. Furthermore, a read-only API key is available, allowing users to create public integrations, such as custom status pages or TV dashboards, directly using JavaScript without exposing write access. However, it is crucial to exercise caution when making this API key public, as all checks, including URL parameters and custom HTTP headers, can be visible, potentially compromising sensitive information. This added layer of security is vital for maintaining the integrity of your data and protecting user privacy.