Name one that doesn’t have an AWS-style per-query cost.

(There might well be a nice one, but I haven’t found it yet.)

If it's for a business, I would contact them to see if they have a commercial offering, but I think the Hurricane Electric Free DNS might actually fit.

https://dns.he.net/

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nfredericks 2 hours ago | parent | prev | next [-]

Might be obvious, but Cloudflare

	▲	amluto an hour ago \| parent [-]
		No. Cloudflare will give a key scoped to an entire administrative domain in the Cloudflare sense like “a.com”. They will not give you a key scoped to a single entry within that domain. (That entry would be a domain in the RFC 9499 sense, but do you really expect anyone to agree on the terminology?) In particular, there is no support for getting a key scoped to _acme-challenge.a.b.c or, even better, to a particular RR. Maybe if you have an enterprise plan you can very awkwardly fudge it using lots of CNAMEs and subdomains. Some DNS hosts that support old-school dynamic dns can do this. dns.he.net is an example, but they have a login system that very much stuck in the nineties.

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radiator an hour ago | parent | prev [-]

Hetzner DNS