DNS providers who easily integrate with Let's Encrypt DNS validation - Issuance Tech - Let's Encrypt Community Support
https://community.letsencrypt.org/t/dns-providers-who-easily-integrate-with-lets-encrypt-dns-validation/86438
> NameCheap is intentionally not included because they do not open API access unless some opaque requirements are met (spend at least $x), failing the first criteria.
泣いてます
まあ実際のところ、サービスを乗り替えただけで使えなくなるような手法はできれば避けたいところなので、 dns-01 は使えたとしても使わなかったと思う