send16.com

Verify the API key and return the authenticated workspace: name, plan, email quota (used/limit), and owner.

Send a transactional email through Send16.

Send a test email for an existing campaign to preview how it will look in recipients' inboxes.

Create a new email campaign in Send16.

Use AI to generate a complete email HTML template based on a description.

List email campaigns with optional status filtering and pagination.

Add a new contact to your Send16 audience.

Search contacts by email address or name.

List all contacts with optional filtering by subscription status and tag.

Bulk import contacts from CSV data.

List all sending domains configured in your Send16 workspace, including their verification status and DNS records.

Check the DNS health of a specific domain, including DKIM, SPF, DMARC, and MX record verification status.

Get detailed performance statistics for a specific campaign including open rate, click rate, bounce rate, and delivery metrics.

Get your workspace's deliverability summary — sending reputation, domain authentication status, and recent bounce/complaint health.

List all automations in the workspace, including draft/active/paused status and trigger types.

Get a single automation by ID, including its trigger, steps, and current status.

Manually enroll a contact in an active automation.

Fire a custom event for a contact.

List starter-gallery email templates available to every workspace.

Get a single starter template by ID, including its EmailContent JSON.

Compile an EmailContent JSON object (the shape used by the Send16 builder + templates) into HTML using the platform's authoritative renderer.

Register a new sending domain.

Run an AI pre-send review on an email's HTML before sending.

Scrape a URL (e.

List messages from the unified send log (transactional + campaign).

Fetch a single message with its full event timeline (created → sent → delivered → opened → clicked → .

Get just the delivery event timeline for a message — no body or recipient details.

List inbox conversations.

Get a single conversation with its full thread of posts (incoming + outgoing).

Reply to an inbox conversation.

Mark a conversation as read for the current viewer.

Update conversation state (open/closed/snoozed/spam/trash), star, or assignee.

Add a private internal note on a conversation.

Decide a pending screener conversation (first-time sender).

Get unread/total counts per category and label for the inbox sidebar (newsletter, transactional, marketing, calendar, social, cold).

List subscription topics.

Create a new subscription topic.

Update a subscription topic (name, description, default).

Delete a subscription topic.

List Actions.

Get a single Action with its trigger config and template binding.

Create an Action that maps an event name to a transactional template.

Update an Action (toggle enabled, change template, change event name).

Delete an Action.

List audiences (lists).

Create a new audience.

Add contacts (by ID) to an audience.

Remove a contact from an audience.

Delete an audience (list).

List dynamic segments.

Preview the contacts that match a segment without sending.

Update a contact's profile fields, custom fields, or subscription state.

Delete a contact and all associated events.

Get a contact's full activity timeline: emails received, events fired, opens, clicks, automation enrollments, topic changes.

Get a contact's 0-100 health score based on recent engagement (opens, clicks, replies).

One-shot broadcast: create a campaign and immediately schedule it to send, in a single call.

Schedule (or send immediately) an existing draft campaign to an audience/segment/topic.

Update a draft campaign's content, subject, preview text, or sender info.

Pause a sending campaign.

Resume a paused campaign.

Duplicate a campaign as a new draft.

Delete a draft campaign.

Preview the recipient set for a campaign before sending.

Activate an automation.

Pause an automation.

Get aggregate analytics for an automation: total enrollments, completed, exited, open/click rates per step.

List active and historical enrollments for an automation.

List workspaces the authenticated user has access to (owner or member).

Get the current workspace (the one the API key belongs to).

Get the workspace's brand settings: colors, logo, fonts, and the DESIGN.

Update workspace brand settings.

Get the current month's send count, contact count, and plan limits.

List suppressed email addresses (bounces, complaints, unsubscribes, manual).

Add an email to the suppression list.

Remove an email from the suppression list.

List configured outgoing webhooks (your endpoints that Send16 POSTs delivery events to).

Register an outgoing webhook endpoint.

Delete an outgoing webhook endpoint.

Rotate the HMAC signing secret for an outgoing webhook endpoint.