Animal Crossing: New Horizons
API for critters, fossils, art, music, furniture and villagers
Free Minecraft data: mobs, biomes, items, enchantments, structures, commands, versions, achievements, trades.
Astroworld API is a free Games & Comics API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free public Minecraft data API: mobs, biomes, items, enchantments, structures, commands, versions, advancements and villager trades as JSON. CORS open, no key, no sign-up.
Details from api.astroworldmc.com.

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API for critters, fossils, art, music, furniture and villagers
Nintendo Amiibo Information
Diablo III, Hearthstone, StarCraft II and World of Warcraft game data APIs
The Astroworld API is provided by Astroworld MC (api.astroworldmc.com). Free public Minecraft data API: mobs, biomes, items, enchantments, structures, commands, versions, advancements and villager trades as JSON. CORS open, no key, no sign-up.
Yes. The Astroworld API is listed in the Games & Comics category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Astroworld API requires no authentication, so you can start making requests without signing up.
Yes. The Astroworld API supports CORS, so front-end JavaScript can call it directly.
Yes. The Astroworld API is served over HTTPS, so it's safe to use in production.