SMS API

Global SMS API for Every Business

Send and receive SMS to 200+ countries with a simple RESTful API. From OTP verification codes to marketing campaigns — one integration, worldwide reach.

Start Sending → Read API Docs

Send SMS — One API Call

curl -X POST https://api.celerd.com/v1/messages \
  -H "X-API-Key: sk_liv…_key" \
  -H "Content-Type: application/json" \
  -d '{"to":"+1234567890","from":"CelerCloud","content":"Your verification code is: 847291"}'

Response

{"id":"msg_abc123","status":"queued","cost":0.015,"currency":"USD"}

Capabilities

Everything You Need to Send SMS Worldwide

From transactional to promotional, single to bulk — our API handles every use case.

🔐

Transactional SMS

Verification codes, OTPs, alerts, and notifications. High-priority routing ensures fastest delivery for time-sensitive messages.

📢

Promotional SMS

Marketing campaigns, flash sales, and promotional offers. Bulk sending with scheduling, A/B testing, and opt-out management.

💬

Two-Way SMS

Receive replies from customers in real time. Set up auto-replies, keyword triggers, and conversation flows via webhooks.

📄

Long SMS

Messages over 160 characters are automatically concatenated (up to 7 parts / 1,120 chars). Pay per segment — transparent pricing.

🖼️

MMS Support

Send multimedia messages with images, audio, and video in supported countries. Same simple API, richer content.

📛

Smart Sender ID

Use alphanumeric sender IDs (where supported) or dedicated short codes. Build brand recognition with a consistent sender name.

Technical

Technical Specifications

      Base URL: https://api.celerd.com/v1/messages
    

API Details

Supported MethodsSend, Status Check, Cancel, Receive

AuthenticationBearer token (API key)

Request FormatJSON

Response FormatJSON

Rate Limits

Free tier10 req/s

Pay-as-you-go100 req/s

EnterpriseCustom limits

Webhook Events

Event	Description
`message.sent`	Message accepted for delivery by carrier network
`message.delivered`	Message delivered to recipient's device
`message.failed`	Delivery failed with detailed reason code
`message.received`	Incoming reply received from a two-way SMS number

Coverage

Direct Carrier Connections Worldwide

We maintain direct connections with 500+ mobile operators worldwide — no aggregators in between.

🇺🇸 North America

Verizon, AT&T, T-Mobile, Bell, Rogers, Telus

🇪🇺 Europe

Vodafone, Deutsche Telekom, Orange, Telefónica, TIM

🌏 Asia Pacific

China Mobile/Unicom/Telecom, NTT Docomo, SK Telecom, Airtel, Jio

🇸🇦 Middle East

STC, Etisalat, Ooredoo, Turkcell, Zain

🇧🇷 Latin America

Claro, Movistar, TIM Brasil, Vivo, Tigo

🇿🇦 Africa

MTN, Vodacom, Airtel Africa, Orange Africa, Safaricom

Developers

SDKs in Every Major Language

Copy-paste examples to get started in minutes. We've got you covered in Python, Node.js, PHP, Java, and Go.

      # Send SMS with cURL

      curl -X POST https://api.celerd.com/v1/messages \

        -H "X-API-Key: YOUR_API_KEY" \

        -H "Content-Type: application/json" \

        -d '{"to":"+1234567890","from":"CelerCloud","content":"Your verification code is: 847291"}'

      # pip install celercloud

      import celercloud

      client = celercloud.Client(api_key="YOUR_API_KEY")

      response = client.messages.create(

          to="+1234567890", from_="CelerCloud",

          content="Your verification code is: 847291"

      )

      print(response.id)      # msg_abc123

      print(response.status)  # queued

      // npm install celercloud

      const celercloud = require('celercloud');

      const client = new celercloud('YOUR_API_KEY');

      const response = await client.messages.create({

        to: '+1234567890', from: 'CelerCloud',

        content: 'Your verification code is: 847291'

      });

      console.log(response.id);      // msg_abc123

      console.log(response.status);  // queued

      // composer require celercloud/sdk

      <?php

      require 'vendor/autoload.php';

      $client = new CelerCloud\Client('YOUR_API_KEY');

      $response = $client->messages->create(['to'=>'+1234567890','from'=>'CelerCloud','content'=>'Your code is: 847291']);

      echo $response->id; echo $response->status;

      // Add dependency: com.celercloud:sdk:1.0

      import com.celercloud.*;

      CelerCloudClient client = new CelerCloudClient.Builder("YOUR_API_KEY").build();

      Message response = client.messages.create(

        MessageCreateRequest.builder().to("+1234567890")

          .from("CelerCloud").content("Your code is: 847291").build());

      System.out.println(response.getId());

      System.out.println(response.getStatus());

      // go get github.com/celercloud/sdk

      import ("fmt" celercloud "github.com/celercloud/sdk")

      client := celercloud.NewClient("YOUR_API_KEY")

      response, err := client.Messages.Create(&celercloud.MessageCreateRequest{

        To:"+1234567890", From:"CelerCloud", Content:"Your code is: 847291"})

      if err != nil { panic(err) }

      fmt.Println(response.ID)

      fmt.Println(response.Status)

Full API Documentation →

Pricing

Transparent Pricing Per Destination

Pay only for what you send. No setup fees, no minimum commitments. Volume discounts automatically applied.

Destination Region	Starting Price (per SMS)
🇺🇸 North America	$0.0075
🇪🇺 Western Europe	$0.012
🌏 Asia Pacific (excl. China)	$0.015
🇨🇳 China Mainland	$0.025
🇸🇦 Middle East	$0.018
🇧🇷 Latin America	$0.020
🇿🇦 Africa	$0.025

Prices vary by specific country and carrier. Volume discounts available. View complete pricing →

FAQ

API Questions

How fast is delivery? ▾

Average delivery time is under 10 seconds for most destinations. North America and Western Europe typically see sub-5-second delivery times.

Can I send to landline numbers? ▾

No, our SMS API supports mobile numbers only. For voice calls to landlines, see our Voice API (coming Q4 2026).

What happens if a message fails? ▾

Our smart routing engine automatically retries via alternative carriers. You'll receive detailed failure reasons through our dashboard and webhooks.

Do you support Unicode (emoji, non-Latin characters)? ▾

Yes. We support UTF-8 encoding for all languages including emoji, Chinese, Arabic, Hindi, and more. Unicode messages are encoded as UCS-2 (1 SMS = 70 characters).