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Unfortunately, it's just a post for testing because there is no testnet API available.

And have you discussed this with any of the witnesses or developers? Maybe @bountyking5 can help.

I was going to ask, but I found someone else asking in Discord, and someone answered them. There's no testnet available for now. I know this post is annoying, but if I have to pay for a server just for the testnet, it's too much

Who have you contacted?

I found the response in a channel on the Discord server. I also tried the API I found on https://developers.steem.io/, but it doesn’t work

Okay, fine, I imagine everyone who handles this information is on that channel. Let's hope there's a solution soon.

it's the rules clear
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The paid challenge costs 1 STEEM to enter. Each participant's entry fee contributes to the prize pool. The player with the highest score at the end of the daily challenge is declared the winner. The winner receives their original entry fee back plus 70% of all other participants' entry fees. The remaining 30% goes toward platform maintenance and future development. The more players who join, the bigger the potential prize! For example, with 10 players, the winner could receive up to 7.3 STEEM. Winners are automatically determined when the challenge period ends, and prizes are distributed directly to the Steem wallet associated with your account