For that, I reached for a favorite tool, #httpie
I grabbed coords for the center of #Minneapolis from Google Maps and put together a test query to generate 1, 2, 3, and 4 minute bike isochrones from the center of town, passing the result straight to the clipboard.
http ':8002/isochrone?json={"polygons":true,"locations":[{"lat":44.975209274420436, "lon":-93.26816979997314}],"costing":"bicycle","contours":[{"time":1},{"time":2},{"time":3},{"time":4}]}&id=center_of_minneapolis_mn' | wl-copy