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Rate Limit

APC enforces two complementary rate limits on the Rate (/v2/getRate, /v2/getRateLandIT, /v2/getRateDetailed) and Track (/api/tracking/*) endpoints:

  • Per second: 10 reqs/sec
  • Per hour: 36000 reqs/hr

These are two independent fixed-window limits. A request that exceeds either window receives an HTTP 429 Too Many Requests response with Retry-After and X-RateLimit-* headers — back off and retry after the delay indicated by Retry-After.

Other endpoints (Label, LandIT™, Services, Update, Void) are not subject to these published limits.