ink
Ask for a secret.
You get a link to hand out, a link to read what arrives, and a key file.
What to ask for
Leave this empty for a single free-text box.
Advanced
Use it from a terminal
One POSIX shell script over the same API. It needs curl, age, tar and jq.
curl -fsSL https://uses.ink/ink -o ink chmod +x ink ./ink new acme 'Client credentials'
Then ink --help for the rest: send, list, read, export, rotate, destroy.