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POST
/
v1
/
api
/
sms
Send SMS (US)
curl --request POST \
  --url https://api.withallo.com/v1/api/sms \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "from": "+1234567890",
  "to": "+0987654321",
  "message": "Hello, this is a test message"
}
'
{
  "data": {
    "from_number": "+1234567890",
    "sender_id": null,
    "to_number": "+0987654321",
    "type": "OUTBOUND",
    "content": "Hello, this is a test message",
    "start_date": "2024-01-15T10:30:00"
  }
}

Documentation Index

Fetch the complete documentation index at: https://help.withallo.com/llms.txt

Use this file to discover all available pages before exploring further.

This endpoint is for sending SMS from US Allo phone numbers. For sending SMS in France, see Send SMS (France).

Authorizations

​
Authorization
string
header
required

Scope needed: SMS_SEND

Body

application/json

Request body for sending an SMS message (US)

​
from
string
required

Your Allo phone number (must be owned by your account)

Example:

"+1234567890"

​
to
string
required

Recipient phone number (E.164 format, same country as 'from')

Example:

"+0987654321"

​
message
string
required

Message content

Required string length: 1 - 1000
Example:

"Hello, this is a test message"

Response

SMS sent successfully

Standard response wrapper for sent SMS

​
data
object

Sent SMS message details