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The Reply API limits the number of requests each user can make. When a limit is exceeded, the API returns 429 Too Many Requests.

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Limits

  • 100 requests per minute
  • 3,000 requests per hour
Limits are applied per user. Requests made by multiple applications, scripts, or services on behalf of the same user count toward the same quota.

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Stricter endpoints

Some endpoints have lower hourly limits than the default quotas, including:
  • Reporting: /v3/reporting/*
  • Sequence statistics:
    • /v3/sequences/{id}/stats
    • /v3/sequences/stats
Analytics and reporting endpoints may return 429 Too Many Requests before the general limits are reached.

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The 429 response

When a rate limit is exceeded, the API returns:
  • Status: 429 Too Many Requests
  • Headers:
    • Retry-After: <seconds> — seconds to wait before the quota window resets
    • Content-Type: application/problem+json

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Handling 429

1

Respect Retry-After

Wait for the number of seconds specified in the Retry-After header before retrying the request.
2

Limit concurrency

For bulk operations, process requests sequentially or use a small concurrency limit instead of sending many requests in parallel.