Send iMessages, SMS, and RCS via REST API
Sendblue API enables sending iMessage, SMS, and RCS messages from a provisioned phone number using plain JSON over HTTPS with support for group messaging
17.2.0Add to Favorites
Why it matters
Enable applications to send iMessages (blue bubbles), SMS, and RCS messages programmatically through a simple REST API without requiring an SDK or complex setup.
Outcomes
What it gets done
Send outbound 1:1 and group messages via iMessage, SMS, or RCS
Add iMessage effects, reactions, and typing indicators to messages
Receive inbound message webhooks and delivery status callbacks
Manage messaging from a provisioned phone number using plain JSON over HTTPS
Install
Add it to your toolbox
Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.
Run in your project directory:
curl -fsSL https://spark.entire.vc/get/ag-sendblue-api | bash After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.
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Overview
Sendblue API
Sendblue API is a REST API that sends iMessage (blue bubbles), SMS, and RCS messages from a provisioned phone number using plain JSON over HTTPS. It supports outbound 1:1 and group sends, iMessage effects, reactions, typing indicators, status callbacks, and inbound webhooks without requiring an SDK. Use this skill when you need to send native iMessage, SMS, or RCS messages with features like group messaging, reactions, effects, and typing indicators. It is particularly useful when you need status callbacks and inbound webhooks to track and respond to messages.
What it does
Sendblue API is a REST API skill that sends iMessage (blue bubbles), SMS, and RCS messages from a provisioned phone number. The API uses plain JSON over HTTPS without requiring an SDK, providing access to outbound 1:1 and group sends, iMessage effects, reactions, typing indicators, status callbacks, and inbound webhooks.
When to use - and when NOT to
Use this skill when you need to send native iMessage, SMS, or RCS messages from a dedicated phone number, particularly when you require group messaging capabilities, iMessage features like reactions and effects, or need to receive inbound message webhooks. It is ideal for scenarios requiring typing indicators or status callbacks to track message delivery.
Do NOT use this skill if you need to send messages from users' personal phone numbers rather than a provisioned number.
Inputs and outputs
Users provide message content as plain JSON over HTTPS, along with recipient information for 1:1 or group sends. For iMessage features, users can specify effects, reactions, and typing indicators. The API accepts webhook configurations for inbound messages and status updates.
The skill outputs message delivery through iMessage (blue bubbles), SMS, or RCS protocols. Users receive status callbacks confirming message state and can process inbound webhooks containing received messages and their metadata.
Who it's for
This skill serves developers who need to send messages via iMessage, SMS, and RCS protocols. It is designed for teams that want to integrate messaging capabilities without managing SDK dependencies, instead relying on straightforward REST API calls with JSON payloads.
Source README
Sendblue is a REST API that sends iMessage (blue bubbles), SMS, and RCS from a provisioned phone number. Everything is plain JSON over HTTPS - no SDK is required. The API covers outbound 1:1 and group sends, iMessage effects, reactions, typing indicators, status callbacks, and inbound webhooks.
Discussion
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