You need to use Mapbox Geocoding API, concretely reverse geocoding. You have to compose your url and refine the results with address as data type Always consider you could get more than one result in the featureCollection response depending your params.
Here you have an example url for the given coords [-73.989, 40.733] which corresponds to 120 East 13th Street, New York, New York 10003, United States:
https://api.mapbox.com/geocoding/v5/mapbox.places/-73.989,40.733.json?types=address&access_token=pk.eyJ1IjoianNjYXN0cm8iLCJhIjoiY2s2YzB6Z25kMDVhejNrbXNpcmtjNGtpbiJ9.28ynPf1Y5Q8EyB_moOHylw
This will return the following
{"type":"FeatureCollection","query":[-73.989,40.733],"features":[{"id":"address.694032850198644","type":"Feature","place_type":["address"],"relevance":1,"properties":{"accuracy":"rooftop"},"text":"East 13th Street","place_name":"120 East 13th Street, New York, New York 10003, United States","center":[-73.9888929,40.7330031],"geometry":{"type":"Point","coordinates":[-73.9888929,40.7330031]},"address":"120","context":[{"id":"neighborhood.2103290","text":"Greenwich Village"},{"id":"postcode.13482670360296810","text":"10003"},{"id":"locality.12696928000137850","wikidata":"Q11299","text":"Manhattan"},{"id":"place.15278078705964500","wikidata":"Q60","text":"New York"},{"id":"region.17349986251855570","wikidata":"Q1384","short_code":"US-NY","text":"New York"},{"id":"country.19678805456372290","wikidata":"Q30","short_code":"us","text":"United States"}]}],"attribution":"NOTICE: ? 2021 Mapbox and its suppliers. All rights reserved. Use of this data is subject to the Mapbox Terms of Service (https://www.mapbox.com/about/maps/). This response and the information it contains may not be retained. POI(s) provided by Foursquare."}