Kudosity Mms

Send MMS Messages

MMS messages are sent via the Kudosity V2 API and support images, GIFs, videos, and audio attachments.

Authentication

• Header: x-api-key: {KUDOSITY_API_KEY}
• Credentials come from the Kudosity dashboard under Developers → API Settings

API Details

• Endpoint: POST https://api.transmitmessage.com/v2/mms
• Content-Type: application/json
• All requests use curl commands

Parameters

Required:

• sender (string): The sender number (must be assigned to the account)
• recipient (string): Destination number (local or E.164 international format)
• content_urls (array of strings): URLs to the media files to attach

Optional:

• subject (string): Message subject — max 20 characters, ASCII only
• message (string): Body text — max 1,000 characters. Use [opt-out-link] for opt-out if required
• message_ref (string, max 500 chars): Your reference ID, returned in webhooks
• track_links (boolean): Enable link tracking with shortened URLs

Example curl Command

curl -s -X POST "https://api.transmitmessage.com/v2/mms" \
  -H "x-api-key: ${KUDOSITY_API_KEY}" \
  -H "User-Agent: kudosity-skills/0.2.1" \
  -H "Content-Type: application/json" \
  -d '{
    "subject": "New Arrival",
    "message": "Check out our latest product!",
    "sender": "61481074185",
    "recipient": "61435795809",
    "content_urls": ["https://example.com/product.jpg"]
  }'

Response

Flat object — not wrapped in a data envelope, the same as SMS and unlike WhatsApp and RCS:

{
  "id": "6fdae71c-dad7-4c36-9734-a69693ec2318",
  "recipient": "61435795809",
  "sender": "61481074185",
  "country": "AU",
  "subject": "USS Enterprise",
  "message": "Check out this amazing specimen.",
  "message_ref": "ncc1701d",
  "content_urls": ["https://example.com/product.jpg"],
  "status": "pending",
  "track_links": true,
  "created_at": "2022-03-29T04:42:01.631708761Z",
  "updated_at": "2022-03-29T04:42:01.631708761Z"
}

status on the immediate response is the submission status — pending here does not mean anything went wrong. Real delivery outcomes arrive via the MMS_STATUS webhook.

Supported Media

Recommended Image Dimensions

For best visibility on mobile devices, use one of these recommended sizes:

• 480px × 480px
• 640px × 640px

Note: Some older handset models have limited support for certain image formats, so results may vary.

Important Notes

• Only one media file can be attached at a time, up to 400 KB
• Media URLs must be absolute paths (e.g., https://example.com/image.jpg), not relative paths
• Currently MMS can only be sent to Australia
• The subject field is limited to 20 characters and ASCII characters only
• Always ask the user which sender number to use if not specified
• The sender must be a number assigned to their account