From the <a href="http://acnhapi.com/">website</a>: 

<ul>
<li>ACNH API is a free RESTful API for critters, fossils, art, music, furniture and villagers from Animal Crossing: New Horizons.</li>
<li>This started for me as a little side project for me but ended up getting much attraction than I ever thought it would get (~3 000 000 requests per day).</li>
<li>The API is free and without authentification to make it easy for anyone to start developing on a subject they like.

ACNH

Github

Twitter

ACNH projects on the QodexAI API Network: This public API documentation features ready-to-use APIs, Collections, and more from Carson Hunter.