canonical: https://jentic.com/apis/sendon.io/sendon

# Sendon API

Sendon SDK API for sending SMS, Kakao Alimtalk, RCS messages, and managing messaging channels and templates. The API exposes 18 endpoints secured with basic authentication.

## For AI agents

Programmatically send text message, list message groups. Covers 18 operations with basic authentication.

## Scope

Does not handle payments, crm, or developer tools - use for communications only.

## Capabilities

- Send text message
- List message groups
- Get message details
- Cancel reserved messages
- Monitor Sendon API operational status and events

## Use cases

### Communications Operations

Use the Sendon API to perform communications operations programmatically. The API provides 18 endpoints covering core functionality including send text message, list message groups, get message details.

Example prompt: Call POST `/msg/send` to send text message

### Automated SMS Management

Automate sms operations by combining multiple Sendon API endpoints. Agents can list message groups and then get message details in a single workflow.

Example prompt: Call GET `/msg/groups` to list message groups, then verify the result

### AI Agent Integration via Jentic

AI agents discover and call Sendon API endpoints through Jentic without managing credentials directly. An agent searches for the required operation by intent, receives the matching endpoint schema, and executes the call with Jentic-managed authentication. This eliminates the need to read API documentation or handle basic tokens manually.

Example prompt: Search Jentic for 'send text message', load the operation schema, and execute with Jentic-managed credentials

## Key endpoints

| Method | Path | Description |
| --- | --- | --- |
| POST | `/msg/send` | Send text message |
| GET | `/msg/groups` | List message groups |
| GET | `/msg/{id}` | Get message details |
| POST | `/msg/group/{id}/send` | Send reserved messages |
| POST | `/msg/group/{id}/cancel` | Cancel reserved messages |
| POST | `/alimtalk/send` | Send Alimtalk message |
| GET | `/alimtalk/group/{id}` | Get Alimtalk message details |
| POST | `/brandmessage/send` | Send brand message |

## Key resources

- **SMS** — SMS/Text message operations
- **Alimtalk** — Kakao Alimtalk notification messages
- **Brand Message** — Kakao brand messages
- **RCS** — Rich Communication Services messages
- **Channel** — Channel management

## AI readiness

This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.

- **Score:** 40 / 100
- **Maturity:** Foundational
- **Dimensions:**
  - Foundational Compliance: 93 / 100
  - Developer Experience & Jentic Compatibility: 63 / 100
  - AI-Readiness & Agent Experience: 47 / 100
  - Agent Usability: 94 / 100
  - Security: 10 / 100
  - AI Discoverability: 100 / 100
- **View full report:** https://jentic.com/apis/sendon.io/sendon/scorecard
- **How the score is calculated:** https://docs.jentic.com/reference/api-readiness-framework/overview/
- **More about the dimensions:** https://docs.jentic.com/reference/api-readiness-framework/specification/#dimensional-model-overview

### Score it yourself

Every API in the directory is allowlisted, so you can re-score it with no key required.

- **Score your own API:** https://jentic.com/scorecard.md
- **Scoring CLI agent skill:** https://github.com/jentic/jentic-api-scorecard/blob/main/skills/jentic-api-scorecard/SKILL.md

```sh
npx @jentic/api-scorecard-cli score <openapi-url>
```

## Why Jentic

- **Setup:** Wiring the Sendon API by hand means setting up its HTTP basic auth against sdk.sendon.io and handling status codes yourself. Through Jentic you install once, import the Sendon API from the API Directory, store the credential once, and your agent calls it.
- **Permission scoping:** The Sendon API puts the message group id in the URL path (`/msg/group/{id}/send` and `/msg/group/{id}/cancel`), so a rule can pin your agent to one message group. You choose the operations it may call, so ones like cancelling a group send are not included unless you add them.
- **Credential handling:** Your Sendon credential is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
- **Discovery method:** Agents search Jentic by intent such as 'send a text message', and Jentic returns the matching Sendon operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

## Related APIs

- **Twilio** — Alternative communications API
- **Sendgrid** — Alternative communications API
- **Pusher** — Complementary communications API

## FAQ

### What authentication does the Sendon API use?

The Sendon API uses HTTP Basic authentication with username and password. Through Jentic, these credentials are stored encrypted in your Jentic One instance and injected at execution time, so raw secrets never enter the agent context.

### Can I send text message with the Sendon API?

Yes. Use the POST `/msg/send` endpoint. The API returns structured JSON responses that agents can parse and act on directly.

### What are the rate limits for the Sendon API?

Rate limits are not specified in the OpenAPI spec. Check the vendor documentation for current limits. Through Jentic, rate limiting is handled automatically with retry logic built into the execution layer.

### How do I send text message through Jentic?

Install the Jentic SDK with pip install jentic, authenticate through Jentic One, the self-hosted execution layer, then search for 'send text message'. Jentic returns the matching Sendon API operation with its input schema. Load the schema and execute the call - credentials are injected automatically.

### How many endpoints does the Sendon API have?

The Sendon API exposes 18 endpoints covering sms, alimtalk, brand message operations.

### Can I limit what my agent is allowed to do with the Sendon API?

Yes. Because you run Jentic One yourself, your own rules decide which Sendon operations the agent may call and which stored credential it uses, so you can allow sending a text message with POST `/msg/send` while leaving out actions like cancelling a group send. Since the Sendon API carries the message group id in the URL path for `/msg/group/{id}/send` and `/msg/group/{id}/cancel`, a rule can pin the agent to a single message group. Operations you do not explicitly grant stay off limits.