SMS, voice and phone numbers for software teams.

Star72 gives SaaS companies and AI agencies one API for business messaging, voice, phone numbers and 10DLC registration, with clear pricing and help with compliance.

Create an account Read the API reference

U.S. numbers. Prepaid, no monthly minimum. See pricing

$ curl https://star72.com/v1/messages \
    -H "Authorization: Bearer s72_live_…" \
    -d '{ "from": "+18455550100",
          "to":   "+12125550199",
          "text": "Your table is ready." }'

{ "id": "0f6c…", "status": "sending", "segments": 1 }

One request sends a text. Every message has a status you can poll, and a webhook fires when it changes.

What the API covers

Messaging: SMS and MMS from U.S. numbers, inbound webhooks and delivery receipts. STOP, HELP and the other opt-out keywords are handled for you, and opted-out numbers are blocked before a message leaves.; POST /v1/messagesGET /v1/messages/{id}
10DLC registration: Register your brand and campaigns from the dashboard or the API. We track carrier review and link your numbers once you are approved.; POST /v1/brandsPOST /v1/campaigns
Phone numbers: Search by area code or state, buy from the dashboard or the API, and attach each number to a campaign. Numbers are yours to port out if you leave.; GET /v1/phone-numbers/availablePOST /v1/phone-numbers
Voice: Call forwarding, voicemail and outbound calls on the same numbers, billed per started minute. Enabled per account after review.; POST /v1/callsGET /v1/calls/{id}/voicemail

Compliance built in

Star72 follows the CTIA Messaging Principles and Best Practices and The Campaign Registry's 10DLC rules. See our Acceptable Use and Messaging Policy and Privacy Policy.

Opt-in required: Every recipient must agree to your messages first, for the kind of messages you send. Purchased or scraped lists are not allowed.
Opt-out handled for you: STOP, UNSUBSCRIBE and the other opt-out words are recorded automatically, and later messages to that number are blocked. HELP returns your registered help message.
Every business vetted: We check each business before it can send, and every number belongs to a registered 10DLC brand and campaign.
No spam or phishing: Prohibited content, public link shorteners and filter evasion are not allowed. We block abusive traffic and close accounts that send it.

How an account goes live

Every account is reviewed before it can send, so the network stays clean for everyone on it.

1.
Create an account
Confirm your email and tell us who you message and how they opt in.
2.
We review your business
A person checks every account before it can send. Keys and brand setup work while you wait.
3.
Register and send
Register your 10DLC brand and campaign, get a number, and start sending.

Pay for what you send

Carrier and registry fees are passed through at cost and shown line by line in your billing ledger.

Outbound SMS segmentper segment, plus carrier fees	$0.0050
Local phone numberper month, plus $1.00 setup	$1.25
Outbound voiceper started minute, once voice is enabled	$0.0080

Full price list

Questions about 10DLC or moving numbers over? Write to us, or open an account and start the review.

Create an account