> For the complete documentation index, see [llms.txt](https://developers.esms.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.esms.vn/en/esms-api/send-sms-api.md).

# Send SMS API

- [Send OTP/Customer care message](https://developers.esms.vn/en/esms-api/send-sms-api/send-otp-customer-care-message.md)
- [Send adveritising message](https://developers.esms.vn/en/esms-api/send-sms-api/advertising-message.md): API dùng để gửi tin Quảng cáo đến khách hàng. Mỗi request tối thiểu 30 số để được duyệt tin và tối đa 5000 số.
- [Send message via Zalo](https://developers.esms.vn/en/esms-api/send-sms-api/send-message-via-zalo.md)
- [Send message via Zalo by UID](https://developers.esms.vn/en/esms-api/send-sms-api/send-message-via-zalo-by-uid.md)
- [Send message via Viber](https://developers.esms.vn/en/esms-api/send-sms-api/send-message-via-viber.md)
- [Send fixed number with cheap price](https://developers.esms.vn/en/esms-api/send-sms-api/send-fixed-number-with-cheap-price.md)
- [Send multi-channel message via Zalo and SMS](https://developers.esms.vn/en/esms-api/send-sms-api/send-multi-channel-message-via-zalo-and-sms.md)
- [Send Zalo message Consulting in text form](https://developers.esms.vn/en/esms-api/send-sms-api/send-zalo-message-consulting-in-text-form.md)
- [Send Zalo message with attached photo](https://developers.esms.vn/en/esms-api/send-sms-api/send-zalo-message-with-attached-photo.md)
- [Send Zalo message Consulting button](https://developers.esms.vn/en/esms-api/send-sms-api/send-zalo-message-consulting-button.md)
- [Send Zalo Trading message](https://developers.esms.vn/en/esms-api/send-sms-api/send-zalo-trading-message.md)
- [Send Zalo messages to request user's information](https://developers.esms.vn/en/esms-api/send-sms-api/send-zalo-messages-to-request-users-information.md)
- [Send Journey ZNS message](https://developers.esms.vn/en/esms-api/send-sms-api/tin-zalo-hanh-trinh.md)
- [Send auto-generated SMS](https://developers.esms.vn/en/esms-api/send-sms-api/send-auto-generated-sms.md)
- [The multichannel auto-generated OTP](https://developers.esms.vn/en/esms-api/send-sms-api/the-multichannel-auto-generated-otp.md)