Apple publishes the iOS App Store top charts as a public feed, per country, with no key and no account. One GET returns the chart as JSON:

curl -s "https://itunes.apple.com/us/rss/topfreeapplications/limit=100/json" \ | jq '.feed.entry | length, .[0]["im:name"].label'

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The URL is https://itunes.apple.com/{country}/rss/{feed}/limit={n}/genre={id}/json , with genre left out for the overall chart.

Feed What it ranks

topfreeapplications , toppaidapplications , topgrossingapplications iPhone Top Free, Top Paid, Top Grossing

topfreeipadapplications , toppaidipadapplications , topgrossingipadapplications the same three for iPad

newapplications , newfreeapplications , newpaidapplications what just launched, not what is winning

Category ids: Games 6014, Business 6000, Education 6017, Entertainment 6016, Finance 6015, Food & Drink 6023, Health & Fitness 6013, Lifestyle 6012, Medical 6020, Music 6011, Navigation 6010, News 6009, Photo & Video 6008, Productivity 6007,…