Global Limits

Brevo limits API requests per endpoint. Each limit is a number of requests per second (RPS), per hour (RPH), or both. The figures below come from Brevo’s rate limits page, checked on 7 October 2026. Check that page before you size a large job.

Rate Limit Tiers

Limits by Tier

When an endpoint has both an RPS and an RPH limit, stay under both.

Rate Limit Headers

Rate-limited endpoints return these headers:

HTTP/1.1 200 OK
x-sib-ratelimit-limit: 1000
x-sib-ratelimit-remaining: 750
x-sib-ratelimit-reset: 1

Header Descriptions

• x-sib-ratelimit-limit: requests allowed in the current window
• x-sib-ratelimit-remaining: requests left in the current window
• x-sib-ratelimit-reset: time until the window resets, usually in seconds

Brevo documents these headers on its rate limit headers page.

Monitoring Usage

Check Current Usage

const checkRateLimit = async () => {
  const response = await fetch('https://api.brevo.com/v3/account', {
    headers: { 'api-key': process.env.BREVO_API_KEY }
  });

  console.log({
    limit: response.headers.get('x-sib-ratelimit-limit'),
    remaining: response.headers.get('x-sib-ratelimit-remaining'),
    resetInSeconds: Number(response.headers.get('x-sib-ratelimit-reset'))
  });
};

Handling Rate Limits

Exponential Backoff

const makeRequestWithBackoff = async (url, options, maxRetries = 3) => {
  for (let i = 0; i < maxRetries; i++) {
    const response = await fetch(url, options);

    if (response.status !== 429) return response;

    const resetSeconds = Number(response.headers.get('x-sib-ratelimit-reset') || 1);
    const delay = Math.max(resetSeconds * 1000, 1000 * Math.pow(2, i));

    console.log(`Rate limited. Waiting ${delay}ms before retry ${i + 1}`);
    await new Promise(resolve => setTimeout(resolve, delay));
  }
  throw new Error('Rate limit retries exhausted');
};

When You Keep Hitting Limits

1. Spread requests evenly: a 1,000 RPS limit allows up to 60,000 requests a minute only when they are spread evenly.
2. Batch and cache: use bulk endpoints and avoid re-reading data you already have.
3. Use webhooks for statistics: receive events instead of polling statistics endpoints.
4. Consider a higher tier: the advanced and extended tiers come with Professional and Enterprise plans.