---
ref: tool:sendgrid/schedule-single-send
name: Schedule a Single Send
company: company:sendgrid
workflows: []
access: [api]
tags: [capability:send-email, category:email, has:api]
docs: https://www.twilio.com/docs/sendgrid/api-reference/single-sends/schedule-single-send
updated: 2026-09-27
---

# Schedule a Single Send

Sends a Single Send right away when send_at is now, or schedules it for a future ISO 8601 time.

Note: Sends real email to every recipient: confirm the Single Send, its recipients and its content with the user first.

## Set up

Use the first option your agent supports.

### API (official)

- Base URL: https://api.sendgrid.com
- Endpoint: `PUT /v3/marketing/singlesends/{id}/schedule`
- Auth: send the header `Authorization: Bearer $SENDGRID_API_KEY`
- Get a key: https://app.sendgrid.com/settings/api_keys
- Docs: https://www.twilio.com/docs/sendgrid/api-reference

Before anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

## Rules

- Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
- Never print API keys.