X (Twitter) credits: what posting to X uses and what this account has left

X is a pay-per-use add-on of the paid plans (Starter, Pro, Agency, Scale; not Free, not during a trial). 1 X credit = 1 X post; a post with a link uses 10 (X charges about 13 times more for links); each image or video adds 1. Each paid plan includes X credits every month (Starter 30, Pro 150, Agency 600, Scale 2,000; they renew on the 1st and do not roll over) and a daily cap of X posts (5, 20, 60, 150); top-up credits (80 for $5, 340 for $20, one-time) are used after them and do not expire. An X post without enough credits is not sent to X: its result has code x_credits_required and the links to buy more. A thread or a reply under the post: each post is an X post (same credits, counts toward the daily cap), all reserved together before the first one is sent.