Send SMS with the EffiLink API

The EffiLink SMS API lets you deliver time-sensitive text messages directly to your users’ phones. Common use cases include one-time passcodes (OTPs) for two-factor authentication, order and shipping notifications, appointment reminders, and service alerts. A single API call can target one recipient or a list of numbers simultaneously.

Regulatory requirement: Due to carrier compliance rules, all SMS content and sender signatures (e.g. [EffiLink]) must be pre-registered on the EffiLink platform and submitted to the carrier for review before any messages can be delivered. Attempts to send unregistered content will be rejected. Register your templates and signatures in the EffiLink dashboard before making API calls.

Send an SMS

Endpoint: POST /v5/sms/sends

cURL example

curl --request POST \
  --url https://api.effilink.co/v5/sms/sends \
  --header 'ApiKey: YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "content": "[EffiLink] Your verification code is 123456.",
    "toList": [
      {"mobile": "18800006666"},
      {"mobile": "18800008888"}
    ]
  }'

Request parameters

Parameter	Type	Required	Description
`content`	string	✅ Yes	The full SMS message body, including the registered sender signature (e.g. `[EffiLink]`). Must match a pre-approved template format.
`toList`	array[object]	✅ Yes	List of recipient objects. Each object must contain a `mobile` field with the destination phone number. Maximum 100 recipients per request for personalized sends; see Batch SMS for per-recipient content overrides.
`toList[].mobile`	string	✅ Yes	The recipient’s phone number (e.g. `"18800006666"`).
`sandboxMode`	boolean	❌ No	Set to `true` to run a test send. The API processes the request normally but does not deliver the message. Useful for validating payloads in development.

Response

A successful request returns HTTP 200 with the following body:

{
  "code": 200,
  "message": ""
}

Field	Type	Description
`code`	integer	`200` indicates the request was accepted for delivery.
`message`	string	Additional status information. Empty on success.

Sandbox mode

Pass "sandboxMode": true in your request body to test your integration without sending live messages. The API validates your payload and returns a normal 200 response, but no SMS is dispatched to the carrier. Remove or set this field to false when you are ready to send in production.

curl --request POST \
  --url https://api.effilink.co/v5/sms/sends \
  --header 'ApiKey: YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
    "content": "[EffiLink] Your verification code is 123456.",
    "toList": [
      {"mobile": "18800006666"}
    ],
    "sandboxMode": true
  }'

Next steps

Need to send different message content to each recipient in a single request? See Batch Personalized SMS to learn how to combine a global template with per-recipient overrides.

Get Started

Authentication

Email

SMS

Contacts & Lists

Webhooks

Limits & Quotas

Send SMS with the EffiLink API

Send an SMS

cURL example

Request parameters

Response

Sandbox mode

Next steps

​Send an SMS

​cURL example

​Request parameters

​Response

​Sandbox mode

​Next steps

Send an SMS

cURL example

Request parameters

Response

Sandbox mode

Next steps