The Yourdiai API keeps your contacts and lists in sync with your other systems, such as SendGrid, Brevo, your CRM or your website's sign-up form.

1. 01Open API keys in your workspace. Owners and admins can create keys.
2. 02Select Create API key, name it and choose its access: read only, or read and write.
3. 03Copy the key straight away. It is shown only once.
4. 04Send it with every request in the Authorization header: Bearer followed by your key.

Syncing contacts

• Send up to 1,000 contacts per request to the batch endpoint. Contacts are matched by email, so you can repeat a sync safely.
• Mark people who unsubscribed at your previous provider as unsubscribed, so they never receive your campaigns.
• An unsubscribed or suppressed contact is never subscribed again by a sync.
• Contacts over your plan’s contact limit are reported back and not created.