Are you on the hunt for the ideal SMS API provider for your business? Your search ends here!

We’ve meticulously evaluated numerous providers, focusing on their pricing, features, reliability, and overall efficacy. Leading our list as the premier SMS API provider is TrueDialog, known for its comprehensive functionality and outstanding reliability, all at a competitive price.

Additional options for SMS API providers include Twilio, Clicksend, Vonage, MessageBird, Clickatell, Trumpia, and BulkSMS. Each provider boasts unique strengths and capabilities that can cater to different business needs and messaging requirements. Ultimately, the best SMS API provider for your needs will depend on your specific requirements and budget.

What is the best SMS API?

  1. TrueDialog: Advanced features and affordable scalability
  2. Twilio: User-friendly platform with a variety of features
  3. ClickSend: Reliable service with competitive pricing
  4. Vonage: Global coverage and a suite of APIs
  5. MessageBird: High deliverability rates and powerful reporting tools
  6. Clickatell: Secure and scalable SMS platform
  7. Trumpia: Mobile engagement with automated messaging
  8. BulkSMS: SMS messaging at scale with an API



SMS Provider Reviewed

Overall rating
Price (out of 5) 5 3 4.5 4 2
Tools (out of 5) 5 5 4.5 3.5 4
Trust (out of 5) 4.5 5 4 4 4
Customer service (out of 5) 4.5 3 3 5 3.5
Years founded 2008 2008 2010 2006 2006
Listed or Private company Private Private Private Private Private
Head Office Austin, Texas San Fransisco, USA New Jersey, USA California, USA Perth, Australia


Price per smsTrueDialogTwilioVonageTrumpiaClickSend
  • Custom
  • 250K
  • 125K
  • 15K
  • 1K
  • $0.0093 per SMS



Payment mode Pay-as-you-go, Pre-Pay Pay-as-you-go, Pre-Pay Prepaid & Invoice Monthly Plan, Pre-Pay Prepaid & Invoice
Price match
Set up fees
Monthly fees
Payment methods Pay-as-you-go, Pre-Pay Pay-as-you-go, Pre-Pay N/A Monthly Plan, Pre-Pay Credit Card or Direct Debit
Payment mode Prepaid & Invoice Credit card or direct debit Prepaid & Invoice Credit card or direct debit Prepaid & Invoice
Price match
Set up fees
Monthly fees

SMS Functions

API for Developers
The Vonage API Platform
Software needed
SMS Gateway
2-Way SMS
Email to SMS
Carriers American & Overseas Global Global Global American & Overseas
Dedicated number
Inbound SMS
Money back guarantee


Global coverage
Gateway uptime 99.99% 99.99% 99.99% N/A 100%
SLA guarantee
Spam compliant
Security and Privacy policy

Customer care service

Free trial
50 Free SMS
Phone support
Email support
Support hours 9am - 5pm 24/7 24/7 24/7 24/7
Reviews 4.8 - 15 Reviews 4.6/5 - ‎205 Reviews Trustpilot = 2.3/5 - ‎7 reviews 4.3/5 - ‎51 Reviews Trustpilot = 4.4/5 - 876 reviews


Overall rating 9.6 6.5 8 8 6.6
Visit Site Visit Site Visit Site Visit Site Visit Site

Skip ahead


TrueDialog Is America’s Best SMS API Provider 2024

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Having compared the leading SMS Gateway API Providers in the USA for 2024, we came to the conclusion that TrueDialog is the best, based on:

  • Low SMS API prices ($0.007 per SMS for 5 Million messages and cheaper as you scale up)
  • Enterprise-grade SMS API solution for businesses of all sizes
  • 99.99% Reliability
  • Invested in reliable direct carrier connections
    (AT&T, T-Mobile, Verizon)
  • Pay as you go and subscriber plans available
  • Ability to send SMS at scale with a single API call.

TrueDialog Review >>Visit TrueDialog >>

Our Rating

The overall rating is based on review by our experts

Value For Money
10 / 10
9 / 10
9 / 10
8 / 10
7.6 / 10
Customer Service
7 / 10

What Is An SMS API?

An SMS Gateway API (or API service)is a platform used by businesses who wish to integrate mass SMS functionality into existing CRM or e-commerce platforms to gain mobile text messaging capability. An API (Application Programming Interface) from a reliable SMS Gateway API provider gives businesses mass text messaging capacity without needing to re-structure their CRM or e-commerce platform set-ups.

An SMS Gateway API acts like an intermediary platform to allow different platforms (such as CRM and e-commerce platforms and an SMS Gateway platform) to speak to each other with a dedicated sender id. With an SMS API businesses can level up their SMS Marketing and SMS Campaigns with the push of a button, easily reaching any number of customers in a segment securely and reliably (e.g with two-factor authentication).

The best SMS API providers are the ones who offer unique features and go above and beyond. TrueDialog is one such provider whose unique mass SMS API with two-way communication capacity sets them apart from the rest, ensuring enterprise-grade SMS API features at the lowest prices.

In computer technology terms, messaging API formats provide a set of processes and tools that help build application software to make the process seamless – transferring from your email to a text message to the recipient’s mobile phone number.

From your perspective, no software is required to be downloaded or installed. The SMS Gateway provider is totally web-based which means there is no software needed that will crash your computer – all you need is a web browser, internet access, and a mobile number lookup list.

Some of the valuable features of SMS Gateway APIs cover:

  • Fast delivery
  • Easy integration
  • Security
  • Business continuity
  • Automation
  • Scalability
  • Rich media support

When comparing the top SMS API providers, there are a number of things to consider to ensure the best outcome for your business based on your needs.

Comparing SMS API providers is critical to ensure that your business gets the best value for money and the correct features. The following factors should be looked into while comparing best SMS API providers:

  • Cost – Lowest costs for mass SMS text messaging with API integration
  • Speed and Reliability – If API is capable of delivering SMS reliably, quickly, and at scale.
  • Ease of Integration – How easy registration, connection, and making API calls is.
  • Integration range – If the API can connect to your CRM platform or E-commerce service

Full SMS Providers List


What are TrueDialog’s SMS API Prices?

With their enterprise volume pricing model, TrueDialog is one of the most competitively priced SMS API Providers in the USA, claiming to offer up to 50% savings compared to competitors.

TrueDialog’s SMS API Prices differ slightly across a range of price points.

Long Code Pricing (SMS Messages Per Month Inbound and Outbound)

  • The first 5 million messages; $.00700/message or $7.00 per thousand messages
  • Next 20 million; $.00500/message or $5.00 per thousand messages
  • Next 75 million;$.00300/message or $3.00 per thousand messages
  • Next 150 million; $.00200/message or $2.00 per thousand messages

Long Code Pricing Overview

Long code SMS API pricing is based on A2P 10DLC System registration fees, as well as per-message carrier fees. These costs are charged in addition to TrueDialog’s standard fees.

A US A2P Standard Brand registration fee is around a $44 one-time registration fee, the cost is based on the campaign use cases.

Carrier Fees differ from carrier to carrier, read about SMS API Direct Carrier Fees on TrueDialog’s site.

Short Code Pricing (SMS Messages Per Month Inbound)

  • The first 500K messages; $.0700/message or $7.00 per thousand messages
  • Next 4.5 million; $.0500/message or $5.00 per thousand messages
  • Next 20 million; $.00400/message or $3.00 per thousand messages
  • Next 75 million; $.00200/message or $2.00 per thousand messages

Again, direct carrier fees for short codes (short message service) will depend on the carrier, but some examples are below:


Overall, TrueDialog’s volume pricing system for businesses of all sizes sets them apart from competitors, as any business, enterprise, large or small – can find the correct plan for their needs and get the best SMS API prices in the market.

After analyzing the prices offered by leading SMS Gateway API providers in the United States, only TrueDialog offers a truly unique perspective at a competitive messenger rate.

SMS API Pricing
1.98 1.47 1.19 0.99
2.47 1.77 1.20 0.89
3.65 3.35 3.21 3.21
0.79 0.79 0.79 0.79
6.90 6.90 6.90 6.90
6.00 3.50 1.90 1.90
5.90 2.99 2.70 2.40
3.20 3.20 3.20 3.20
1.90 1.50 1.00 1.00
2.93 2.93 2.93 2.93
4.75 2.20 2.10 1.70
4.00 2.90 2.10 2.00
6.00 3.95 3.86 3.86
7.40 1.99 1.99 1.99
4.90 3.50 2.50 2.50

Current is in $$$

While all SMS API providers offer their own pricing models, our comparison finds TrueDialog to offer the most value for money outside of toll-free numbers.

Our TrueDialog Review Cheapest SMS API



Is TrueDialog Reliable?

TrueDialog offers the lowest SMS API prices, so where is the catch? Fortunately, there is none, as they also offer one of the best service level agreements in the market at 99.99% up-time guaranteed.

TrueDialog also has a unique efficient API network, where unique campaign endpoints allow for SMS at scale with a single API call. Instead of one API call per message, TrueDialog saves bandwidth and time with cheaper and more reliable SMS delivery.

The 99.99% up-time guarantee is why both enterprise size, and smaller businesses trust TrueDialog.

Business Support

TrueDialog’s features, low prices, and reputation in the United States make them one of the USA’s most reliable and trustworthy SMS API Providers. But it doesn’t stop there.

TrueDialog also excels at customer support, with most customers hearing back within an hour of making an inquiry (within business hours).

You can reach out to TrueDialog via email or phone:

Email: info [@]

Phone: (512) 501-5940

Overall, while still on the smaller side of providers, TrueDialog is geared to take the SMS API market by storm, due to its low costs, helpful staff and reliable service and features.


What Features does TrueDialog Offer?

TrueDialog is a leading SMS API provider that enables mass distribution of SMS communication for businesses large and small. With iOS and Android app connectivity it makes it easy for anyone to use, and is cheaper than many other global sms competitors.

But where TrueDialog truly shines is its features:

  • Businesses can send automated appointment reminders and mass alerts e.g for emergency situations
  • Using their scheduling engine, businesses can share marketing campaigns at custom time intervals allowing for flexibility and high customer engagement and open rates.
  • Businesses can communicate with customer via both iOS and Android mobile apps

Businesses can also integrate with a wide range of CRM systems:

  • Microsoft Dynamics
  • Eloqua
  • Social Messaging Apps
  • Marketo
  • Salesforce
  • Five9
  • Hubspot
  • WhatsApp

Overall, TrueDialog offers a wide range of unique and useful features at a truly competitive price point.
They also offer a 15-day free SMS API trial.

TrueDialog offers a wide range of unique solutions, further standing out from the SMS API crowd:

  • Software & Deliverability

TrueDialog’s API comes with full documentation and is highly secure and reliable. With direct carrier connection, they guarantee fast, secure, and 99.9% uptime SMS API.

  • Efficient SMS API

With their unique campaign endpoints, TrueDialog allows businesses to send millions of messages with a single API call, saving time and resources.

  • Dual Opt-Out Database

TrueDialog has a custom double Opt-Out database in their ISO 9001 Cloud Database which provides extra protection against texting a customer who has opted out.

  • The ‘TrueDialog’ Feature

TrueDialog has a unique out of the box two-way communication capacity which allows businesses to have seamless conversations with customers at scale.

  • Drill-Down Reporting

TrueDialog has built-in reporting with the ability to build custom “drill-down” reports.

Visit Website >>

Benefits of SMS Gateway API

  • SMS Gateway API is a faster and more reliable way to mass text message target customers at scale when compared to traditional marketing communication methods.
  • SMS API helps a business link its important systems and platforms together into a more centralized functioning hub. This makes it easier to send communications in bulk across a wider range of networks.
  • SMS API solutions can be personalized to suit your business needs, correctly integrated into a CRM or E-commerce platform, businesses can reach out to customers with detailed information such as name as well as one-time-pins (OTP).
  • SMS API can guarantee data security and speed as they are customized to protect businesses while harnessing the data power of direct carrier relationships.
  • SMS Gateway API is reliable in both speed and usage, with a single API lookup and call, a business can reach millions of customers across various platforms and technological networks with real-time feedback responses.

How Should American Businesses integrate an SMS API?

Using an API is common practice amongst many US businesses with large-scale communication needs. Using SMS API, developers can connect across SMS Gateways to send and recieve SMS through preferred API code systems, like PHP, Java, SMPP, SOAP, or REST API. Often, a API SMS service provider, like TrueDialog, will provide full instructions and documentation docs, as well as trials, SDKs, sample costs, routing support, and reusable customer libraries.

The best SMS API providers will offer support, such as TrueDialog which offers a dedicated account representative with a majority of their SMS Business plans.

When a business is getting ready to utilize an API, the mass text message provider (sms gateway) will supply a sample code that the business can then use to connect to the API using SOAP. This connection can occur regardless of API programming language preference (Java, Github (C3),  Bash, Ruby, Python, PHP, Powershell, C++ or JSON).

Why should a business integrate with TrueDialog’s SMS API?

SMS API integration with TrueDialog is easy and popular:

  • Direct Carrier Relationships: TrueDialog has invested extra funds to cut out the middleman and supply a direct carrier API.
  • Mass Text Message Communication: Connecting the API to a CRM or E-commerce platform is easy, so businesses for high-volume communication with end users.
  • Two-Way SMS: Customers have the ability to send an SMS back after receiving a text message to and from American mobile networks.
  • Delivery Reporting: Businesses can track the text message or notifications exact delivery time, i.e. delivery receipts, when it was received, giving businesses delivery insight.

SMS API Frequently Asked Questions

An SMS gateway API allows simple query parameters via URLs that provide SMS gateway instructions to send and receive sms. This can be enabled through scripting language such as PHP that can be integrated to web forms and other applications.

A SMS API is a software interface system which uses code to send SMS to customer libraries via an SMS Gateway. The technical infrastructure behind mass text messaging is divided across various delivery systems and interface softwares (such as an SMS Gateway). API are often considered the bridge between these softwares, allowing for futher functionality thorugh intergration.

The best SMS API are cheap, easy to use and scalable, allowing web applications and businesses to easily send and recieve sms through pre-written logic.

Here is our list of the best SMS API providers:

  • TrueDialog
  • Twilio
  • Vonage
  • MessageBird
  • ClickSend
  • ClickaTell
  • Trumpia
  • BulkSMS


About Our SMS Gateway API Comparison Page

Our Best SMS API page compares the top 8 best SMS API Gateway providers in the USA. If you found this comparison interesting, also read our Bulk SMS API Comparison for USA businesses in 2024. The information analyzed on the page was sourced from the SMS provider’s websites, however as data is subject to change, we recommended you verify the information with the provider. If you find any incorrect information, please contact us using our contact form, and we will amend it immediately. Our mission at SMS comparison is to assist American businesses in choosing the right SMS Gateway API provider to meet their mass text messaging requirements.

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