Sendinblue

Overview

Sendinblue (now Brevo) provides transactional email, marketing campaigns, SMS, and contact management. The API lives at api.brevo.com/v3 (verified live — the host responds; an invalid key returns 401).

Quick Start

Account info (replace YOUR_KEY):

curl "https://api.brevo.com/v3/account" \
  -H "api-key: YOUR_KEY"

{ "email": "you@example.com", "plan": [{ "type": "free", "credits": 300 }] }

Send transactional email:

curl -X POST "https://api.brevo.com/v3/smtp/email" \
  -H "api-key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sender": { "email": "no-reply@example.com" },
    "to": [{ "email": "user@example.com" }],
    "subject": "Hello",
    "htmlContent": "<h1>Hi!</h1>"
  }'

Authentication

• Register at brevo.com (formerly sendinblue.com) → API key (Settings → API Keys).
• Send it as the api-key header (invalid key → 401, verified).

Rate Limits & Notes

• Free tier: 300 emails/day; paid plans scale.
• The API rebranded with the company: api.brevo.com/v3 (the old sendinblue host redirects).
• Endpoints: /v3/smtp/email (transactional), /v3/contacts, /v3/emailCampaigns, /v3/account.
• Batch sending and webhooks are supported.

FAQ

Is Sendinblue free? Free tier: 300 emails/day; more is paid.

Why api.brevo.com? Sendinblue rebranded to Brevo — the API is now at api.brevo.com/v3.

How do I get a key? brevo.com → Settings → API Keys.