Listrak Rate Limits

Listrak publishes a numeric rate limit for exactly one of its eight REST APIs. The Privacy REST API states 20 requests per 10 seconds and 60 requests per minute in its own spec description. The Mobile App Push and Two-Way SMS APIs declare 429 Too Many Requests as a real response on nine operations and list it in their status-code tables, but publish no number. The Email, SMS, Data Import, Cross Channel and Media APIs publish neither a number nor a 429. NO Listrak API documents a rate-limit response header of any kind - no RateLimit-*, no X-RateLimit-*, no Retry-After - so a client that hits a limit gets a status code and no runtime signal to pace against.