If you're using Aqua from nostr:npub1jan3xfrvxmd35smylytmnp3ne0sgqh2x47yq766s55zaf6eja4rselx52y I would recommend not using the built in third party service to buy bitcoin. It's very expensive. Here's a comparison of buying $100 USD from Aqua version Strike. 
https://i.nostr.build/E4Xk.jpg#m=image%2Fjpeg&dim=1080x2340&blurhash=%5BVEy%23%3FbaNGof%3Fuazspj%5B%5EkaykBj%5B%7EqfjWBay%3Ftjuo2ay%3D%7Dj%5BoyaypGj%5Bs%3AWC%5E%2BofR%25WBkUj%5Bn%2BWC&x=53481ccf5e1a60d8473af73450ffdcf903036603ee204a6e0b9c02a087aaf559
https://i.nostr.build/J9P7.jpg#m=image%2Fjpeg&dim=1080x2340&blurhash=%5B45%23hSRj00ayIUWB%3Fbj%5B%7Eqof00j%5B9FWB%3Fbj%5B%25MRjWBof9FWB-%3BofD%25ay%25Mof%25MWBM%7BofD%25WB-%3Bj%5B&x=197cb6fb422e0dfd42e0be8bf568ad2bc2991f69961f872577f375d36e333e29