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It is determined by the current Helios price. The higher the price, the fewer tokens to burn; the lower the price, the more tokens to burn.

Nowadays, the price is higher, and it takes approximately 55 Helios to burn and receive a 100% upvote.

Cool.

How do you get Helios to know which post you’re “boosting”?

You will earn Helios tokens based on price and a 20% APR by delegating to @helios.voter.

You can also buy Helios on the market.

Okay.

Let’s say I’ve bought token and sent it to the burn account.

Do I send a link to the post to them ?

Yes you need.