Messaging API 429s on /api/v2/messaging/conversations

General Discussion
1

hitting a hard wall on the messaging endpoint. sending 100 concurrent requests and getting 429s after exactly 15. headers show X-RateLimit-Reset but the window is inconsistent. any chance someone mapped the burst vs sustained limits for this org?

2

hey, i’m probably missing something obvious here since i’m new to the sdk. i’ve been hitting 429s too. does the python sdk handle retries automatically or do we need to build that in? i tried a simple sleep but it feels hacky. sorry if this is a basic question.

3

429s on messaging aren’t about burst limits, they’re about you spamming the endpoint without respecting the X-RateLimit-Reset header. Check your retry logic, because sleeping blindly is why you’re getting blocked.

4

not an sdk user here. just building flows.

the 429s are real. the platform throttles hard on conversation creation. don’t fight it with retries in the code. fix it in the flow logic.

use the ‘Pause’ block. set it to wait 1-2 seconds between messages. it’s ugly but it stops the 429s instantly. also check if you’re sending to the same external id repeatedly. the system treats that as spam faster.

spread the load out. don’t blast 100 at once.

5

The SDK doesn’t handle rate limiting for you. It’s a non-starter for high-volume messaging. You need to parse the X-RateLimit-Reset header yourself.

Here’s how I handle it in the Python SDK. Don’t just sleep. Check the header.

import time
from purecloudplatformclientv2 import ApiClient, MessagingApi, Configuration

config = Configuration()
api_client = ApiClient(config)
messaging_api = MessagingApi(api_client)

def send_message_with_retry(payload, max_retries=3):
 for attempt in range(max_retries):
 try:
 response = messaging_api.post_messaging_conversations(message_create_request=payload)
 return response
 except Exception as e:
 if e.status == 429:
 reset_time = float(e.headers.get('X-RateLimit-Reset', 5))
 wait_time = max(0, reset_time - time.time())
 print(f"Rate limited. Waiting {wait_time:.2f}s")
 time.sleep(wait_time)
 else:
 raise e
 raise Exception("Max retries exceeded")

Blind sleeps fail because the window shifts. Parse the header. It’s the only way.