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HTTP Return Codes

  • HTTP 4XX return codes are used for malformed requests; the issue is on the sender's side.
  • HTTP 403 return code is used when a WAF (Web Application Firewall) rule has been violated. This can indicate a rate limit violation or a security block. See https://www.binance.com/en/support/faq/detail/360004492232 for more details.
  • HTTP 409 return code is used when a cancelReplace order partially succeeds. (i.e. if the cancellation of the order fails but the new order placement succeeds.)
  • HTTP 429 return code is used when breaking a request rate limit.
  • HTTP 418 return code is used when an IP has been auto-banned for continuing to send requests after receiving 429 codes.
  • HTTP 5XX return codes are used for internal errors; the issue is on Binance's side. It is important to NOT treat this as a failure operation; the execution status is UNKNOWN and could have been a success.