Enterprise API: https://developer.twitter.com/en/docs/accounts-and-users/subscribe-account-activity/api-reference/aaa-enterprise#get-account-activity-webhooks-webhook-id-subscriptions-all-list
The docs say: Requests / 15-min window (application auth): 50
However, the subscriptions/all/list.json endpoint has a 15 min window of 15 calls it seems; this is what I got with the 429 response headers:
subscriptions/all/list.json
"x-rate-limit-limit": [ "15" ], "x-rate-limit-reset": [ "1530610561" ], "x-rate-limit-remaining": [ "0" ],
Thanks for reporting this, we will look into this and update the documentation as necessary. Appreciate you making us aware of the issue.