Rate Limits

API4Business enforces rate limits to ensure fair usage and platform stability.

Default limits

Rate limits are applied per API key. When you exceed the limit, the API returns a 429 Too Many Requests response.

Rate limit response

{
  "errorCode": 429,
  "errorType": "proxy",
  "errorMessage": "Quota Violation"
}

Retry strategy

When you receive a 429 response, implement exponential backoff:

Python

import time
import requests

def call_with_retry(url, headers, json_data, max_retries=3):
    for attempt in range(max_retries):
        response = requests.post(url, headers=headers, json=json_data)
        if response.status_code == 429:
            wait = 2 ** attempt  # 1s, 2s, 4s
            time.sleep(wait)
            continue
        return response
    raise Exception("Max retries exceeded")

Node.js

async function callWithRetry(url, options, maxRetries = 3) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    const response = await fetch(url, options);
    if (response.status === 429) {
      const wait = Math.pow(2, attempt) * 1000;
      await new Promise(r => setTimeout(r, wait));
      continue;
    }
    return response;
  }
  throw new Error("Max retries exceeded");
}

Contact for higher limits

If you need higher rate limits for your use case, contact support@api4business.com.

What's next

• Error Handling — Handle all error scenarios
• Authentication — Manage tokens efficiently