Rate Limits & Error Handling

To ensure consistent performance and protect our multi-tenant infrastructure against abuse, the XeCubes API enforces rate limits on all incoming requests.

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Tier Quotas

Limits are evaluated based on your organization tier:

Plan Tier	Read Requests	Resume Parser Ingest	Concurrency Cap
Starter	60 req / min	10 resumes / min	5 parallel connections
Professional	300 req / min	60 resumes / min	25 parallel connections
Enterprise / Custom	2,500+ req / min	500+ resumes / min	100+ parallel connections

Need elevated rate limits for high-volume migration? Contact our enterprise team at +44 7471 530754 or email [email protected].

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Rate Limit Headers

Every HTTP response includes standard rate limit headers indicating your remaining quota:

HTTP/1.1 200 OK
X-RateLimit-Limit: 300
X-RateLimit-Remaining: 284
X-RateLimit-Reset: 1717588800

• X-RateLimit-Limit: Maximum requests permitted within the current time window.
• X-RateLimit-Remaining: Number of requests remaining in the active window.
• X-RateLimit-Reset: Unix epoch timestamp (in seconds) when the current window resets.

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Inspecting Limits via Code

cURL

curl -I -X GET "https://api.xecubes.com/recruiter/bootstrap" \
  -H "X-API-Key: xh_live_your_secret_key"

Node.js

const res = await fetch('https://api.xecubes.com/recruiter/bootstrap', {
  method: 'HEAD',
  headers: {
    'X-API-Key': 'xh_live_your_secret_key'
  }
});

console.log('Limit:', res.headers.get('X-RateLimit-Limit'));
console.log('Remaining:', res.headers.get('X-RateLimit-Remaining'));
console.log('Reset Time:', res.headers.get('X-RateLimit-Reset'));

Python

import requests

response = requests.head(
    "https://api.xecubes.com/recruiter/bootstrap",
    headers={"X-API-Key": "xh_live_your_secret_key"}
)
print("Limit:", response.headers.get('X-RateLimit-Limit'))
print("Remaining:", response.headers.get('X-RateLimit-Remaining'))

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Handling HTTP 429 Too Many Requests

If you exceed your quota, the API will reject requests with 429 Too Many Requests and provide a Retry-After header specifying how many seconds to wait:

{
  "status": "error",
  "code": "RATE_LIMIT_EXCEEDED",
  "message": "Too many requests. Quota exceeded for your organization tier.",
  "retry_after_seconds": 12
}

Exponential Backoff & Jitter Implementation

async function fetchWithRetry(url: string, options: RequestInit, maxRetries = 4) {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    const response = await fetch(url, options);
    
    if (response.status !== 429) {
      return response;
    }

    const retryAfter = parseInt(response.headers.get('Retry-After') || '1', 10);
    const jitter = Math.random() * 500;
    const waitTime = (retryAfter * 1000) + (Math.pow(2, attempt) * 200) + jitter;

    console.warn(`Rate limited. Waiting ${Math.round(waitTime)}ms before retry ${attempt + 1}...`);
    await new Promise(resolve => setTimeout(resolve, waitTime));
  }

  throw new Error('Max retries exceeded due to rate limiting.');
}