What's some of your best opening messages on online dating apps to almost guarantee a response?

[Kurαȷ]

You get responses from messages that prompt further conversation, even if they are little nonsensical or outlandish.

Such as-
Do you like onions?

Of course, you ideally want the question to be in some way interesting for the other party, and to have a good follow up to it.
If they reply "why do you ask?" you shouldn't reply "I don't know, lol", you should reply with something that's going to continue building the other person's interest.

You can't say "hello" not because it's boring, but because it isn't a conversation starter.
The best they can reply to that is "hi", and then you still have to come up with a conversation starter.

[Gooblegobble]

I’ll let you know when I get a response.

[rachel776]

i like when guys just say hi