Limits

Tiers, request units, history windows and the rate-limit headers.

• TiersThe API tiers - Sandbox, Elite included, Starter, Developer, Business - with their units, streams, webhooks and prices.
• Units and weightsWhat each operation costs in request units, the rule behind heavy calls, and how to read X-Request-Weight.
• History windowsHow far back each tier may read on each route; what happens past it.
• Rate-limit headers and 429The RateLimit and X-Quota headers on every answer, handling 429 with Retry-After, and the 503 overloaded rule.