https://github.com/LayerXcom/research-hunt-contract/blob/d9d070f3b92bb535a856523e636d2a552f24b413/contracts/research_hunt.vy#L275 https://github.com/LayerXcom/research-hunt-contract/blob/d9d070f3b92bb535a856523e636d2a552f24b413/contracts/research_hunt.vy#L297 https://github.com/LayerXcom/research-hunt-contract/blob/d9d070f3b92bb535a856523e636d2a552f24b413/contracts/research_hunt.vy#L364 msg.value使ってないのでこの辺のpayableは不要な気がする
