SMS APIOne request. Every phone.

POST /transactional/v1/sms

curl -X POST https://api.instasent.com/transactional/v1/sms \
  -H "Authorization: Bearer $INSTASENT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "HiStrips",
    "to": "+34600000000",
    "text": "Your HiStrips order is on its way."
  }'

201Created"id": "sms-7f3c2a91"

Your webhook

Delivery reports, as they happen

accepted10:15:01
{ "id": "sms-7f3c2a91", "status": "accepted", "code": 0 }
delivered10:15:03
{ "id": "sms-7f3c2a91", "status": "delivered", "code": 0 }

The messages your code
sends, on the phone.

24°

Messages

Today

HiStrips: 482913 is your verification code. It expires in 10 minutes. Don't share it with anyone.

Text message

Details

HiStrips

Notifications

Block & report spam

Delete conversation

Reply STOP to unsubscribe from HiStrips.

Your first SMS
in three steps.

Copy your token. It's under API tokens, in the dashboard.

Top up. Each SMS draws from your balance.

Send. One POST, and the id comes back.

API keys

API key

Destination country

Channels

SMSRCSWhatsApp

Send a message

Copy for AI

curl -X POST https://api.instasent.com/transactional/v1/sms \
  -H "Authorization: Bearer $INSTASENT_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "HiStrips",
    "to": "+34600000000",
    "text": "Your HiStrips order is on its way."
  }'

Everything around
the SMS, in one API.

Send one. Codes, alerts and receipts, one call each.

Send a hundred. Up to 100 messages in a single call.

Know when it lands. Every status, on your webhook.

Hear back. Replies and opt-outs, on the same webhook.

Check the number. An HLR lookup before you send.

Reach 200+ countries. With each country's price, from the API.

Your sender, cleared
in every country.

Most countries

Alphanumeric. Your brand as the sender, where the country allows it.

United States

10DLC. Local US numbers, with your brand and campaign registered.

United States · Canada

Toll-free. A verified number for the US and Canada.

REST for your app.
SMPP for your platform.

HTTP · JSON

REST. JSON over HTTPS, for your app.

Read the docs SMPP

SMPP. Persistent sessions for platforms and wholesale traffic.

Read the docs

Official SDKs,
in your language.

Node.jsnpm install instasentPythonpip install instasentPHPcomposer require instasent/instasent-php-libRubygem install instasentJavainstasent-java-lib.jar

Full API reference

Your AI agent,on your SMS over MCP.

Agents MCP server

ClaudeConnectors ChatGPTDeveloper mode Codexcodex mcp add CursorSettings → MCP Geminigemini mcp add GrokConnectors

Nothing is sent without your OK.
Drafts stay off until you turn them on.
Read-only by default.

Frequently
asked questions

How do I get an API token?

Create an account and a token is issued for your first project. You will find it under API tokens in the dashboard.

How many messages can I send per request?

Up to 100 per call to /sms/bulk. For more, split them into batches and send them in parallel: each bulk call counts as a single request against your rate limit.

How do I know a message was delivered?

Point a webhook at your token and every status change, from accepted to delivered or failed, arrives there as it happens.

Does accepted mean delivered?

No. The API accepts the message and returns its id; delivery comes later, when the carrier confirms it and your webhook receives the delivered status.

What does each SMS cost?

It depends on the destination country and on the number of parts: a standard SMS holds 160 characters, or 70 with accents or emoji, and each extra part is billed as one more SMS. Per-country prices are readable from the API.

Can I send to the United States and Canada?

Yes, from a registered sender: a 10DLC brand and campaign or a verified toll-free number, requested from the dashboard like any other country registration.

Should I use REST or SMPP?

REST for most applications. SMPP when you run your own messaging platform or need persistent sessions at carrier-grade volume.

Can I receive replies?

Yes, with two-way enabled on your account: inbound messages and opt-outs arrive on the same webhook as your delivery reports.

Your first SMS,
one request away.

Start