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📈 Overview

Rate limits exist across FNLB’s APIs to prevent spam, abuse, and service overload. The FNLB API uses global rate limiting as well as per-endpoint rate limits to ensure fair usage and protect system stability.

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🔒 Global Rate Limit

  • Limit: 100 requests per 10 seconds
  • Scope: Per IP Address (globally across all endpoints)
  • Reset: Every 10 seconds
This means you can make up to 100 requests total across all endpoints within any rolling 10-second window. Exceeding this limit will result in a 429 Too Many Requests error.

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📍 Per-Endpoint Rate Limits

In addition to the global rate limit, some API endpoints may have individual rate limits based on their sensitivity or resource intensity. These limits help prevent misuse of specific endpoints and ensure availability for all users.
  • Rate limits vary by endpoint.
  • Limits are enforced in addition to the global rate limit.
  • If a per-endpoint limit is exceeded, a 429 error will be returned.
You should design your client to handle rate limiting dynamically, regardless of whether it’s global or endpoint-specific.

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🛑 Exceeding the Limit

When you exceed either a global or per-endpoint rate limit, the server responds with: 
HTTP/1.1 429 Too Many Requests
Retry-After: 10
Content-Type: application/json

{
    "type": "error",
    "errors": [
      {
        "type": "general",
        "errorCode": "net.fnlb.errors.common.rate_limit_exceeded",
        "message": "You are being rate limited."
      }
    ]
  }
  • Retry-After header indicates how many seconds to wait before retrying.

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🔄 Best Practices

  • Implement retry logic: Automatically back off and retry after the time specified in the Retry-After header.
  • Avoid bursts: Spread your requests evenly over time.
  • Queue your requests: Use a task queue or request scheduler in your app to prevent accidental spikes.
  • Monitor usage: Keep track of your request volume and avoid unnecessary calls.

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🧪 Example in JavaScript (with Retry)

async function fetchWithRetry(url, options, retries = 3) {
  for (let i = 0; i < retries; i++) {
    const res = await fetch(url, options);
    if (res.status !== 429) return res;

    const retryAfter = res.headers.get("Retry-After");
    const waitTime = (retryAfter ? parseInt(retryAfter) : 10) * 1000;
    await new Promise(resolve => setTimeout(resolve, waitTime));
  }
  throw new Error("Rate limit exceeded after multiple retries.");
}

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💡 Need More Capacity?

If your application needs higher throughput, contact FNLB Support to request increased rate limits.

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