X-Credits-Used and what’s left in X-Credits-Remaining.
Free credits
New accounts get 1,000 free credits once they verify their email, topped back up each month until the first purchase. The free rate is 1 request a second (60 a minute).Credit packs
Packs are prepaid, with no subscription. Credits from packs last 12 months from purchase. Credits bought at a faster rate are spent first, then the oldest.
Prices in US dollars. See pricing for faster rates and the credit calculator.
Buy packs in billing. When the balance runs out, calls return
402 insufficient_credits, free, until you add more. You can get an email when the balance runs low, in notifications.