Free APICommsAPI keyOfficial
Brevo (formerly Sendinblue)
300 transactional emails a day on a no-card free plan with full API, SMTP and webhooks
Brevo is an email and marketing platform whose transactional email API sends templated or raw HTML mail over REST or SMTP relay. The free plan keeps full API access, webhooks, and templates. It is one of the few mature providers whose forever-free tier never expires and needs no credit card.
Free tier
Free forever: 300 emails/day, no credit card; full transactional API + SMTP + webhooksRate limits
API allows high throughput (~1,000 req/s documented on send), but the free account is hard-capped at 300 emails/dayAuth
API keyBase URL
https://api.brevo.com/v3What you'd build with it
- Send transactional and notification email from automations without paying or adding a card
- Use stored templates with variable substitution driven by an AI agent
- Sync enriched contacts into lists and trigger event-based emails
- Use the SMTP relay when a tool only supports SMTP, not REST
Key endpoints
- POST
/smtp/emailSend a transactional email (raw HTML or stored template) - POST
/contactsCreate or upsert a contact in a list - GET
/smtp/statistics/eventsFetch delivery/open/click events for sent mail - POST
/smtp/templatesCreate a reusable transactional email template
Members
Members get the runnable recipe
Sign in free to copy the example request, see a sample response, and read the gotchas.
Tags
emailtransactionalsmtpcontactswebhooks