Question: Is there an API that can retrieve DNS records, such as A, CNAME, and MX records, quickly and efficiently?

For pulling DNS records like A, CNAME and MX records, URL Meta is a powerful option. Its DNS API supports all standard record types and offers fast response times, so it's great for developers and apps that need to monitor domains or aggregate content. The service also comes with a free plan with 500 requests per month, and you can upgrade to a premium plan if you need more.

Another tool worth mentioning is SingleAPI, which converts any website into an API in seconds using GPT-4 technology. It's geared more toward general web scraping and data retrieval, but it can also be used to pull DNS records and can be a good option if you need a broader data retrieval system. It offers several pricing tiers, including a free plan with limited requests.