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Messaging API

Your one-stop shop for easy, programmable SMS/MMS messaging

Easily send and receive messages at scale, verify users with 2FA, deliver alerts and marketing campaigns, and engage customers in two-way conversations with FreeClimb Messaging API, backed by proven code and a powerful, carrier-grade platform.

Send your first SMS/MMS message in minutes with expert documentation, SDK libraries, sample code, and tutorials.

Know exactly when your messages are delivered and easily debug your apps with detailed logs.

Deploy messaging campaigns faster with our 10DLC concierge support.

Panel of code using FreeClimb API configuration.

Businesses choose the FreeClimb API platform for its reliability, support, and cost-effectiveness

Integrate scalable messaging into your applications in minutes. From high deliverability to transparent reporting, our platform is designed to cover all the details, so that you can focus on offering rich and meaningful experiences.

Long message concatenation

When an SMS/MMS message exceeds the character limit for a single text, our API automatically segments long messages and pieces them together upon delivery, ensuring the recipient sees a single cohesive message.

Message queueing

The API queues incoming messages to ensure they are efficiently processed in order and prevent system overload. Each message is assigned a unique ID and timestamp for easy tracking throughout its lifecycle.

Message logs and reporting

Receive instant updates on message delivery, status changes, and errors via advanced webhook logging, giving you the visibility you need to troubleshoot, debug, and reduce costs.

Automatic message encoding

FreeClimb automatically detects and translates Unicode characters into GSM7 characters, minimizing cost per send and maintaining compatibility with a wide range of devices and networks.

Opt-in and opt-out support

FreeClimb applications can programmatically respond to opt-in, opt-out, or "help" keywords, updating subscription lists and ensuring compliance with regulations.

Use any sender type

Easily buy, manage, or port local (10DLC), toll-free, and short-code numbers, or use numbers you already own.

An API platform built for scale, speed, and performance

FreeClimb API platform diagram of calls flowing through call queue or REC and into contact center. The platform connects to the FreeClimb Dashboard and customer application.

Best-in-class platform reliability

For decades, FreeClimb has maintained a 99.999% uptime through direct Tier 1 interconnects and a fault-tolerant software architecture, ensuring optimal call quality, message deliverability, and service availability.

Ironclad security and compliance

FreeClimb is certified to the most rigorous compliance standards, including HIPAA and Level 1 PCI DSS, enabling businesses to scale into new markets with ease.

Safeguard data with encryption

All API communications are secured using HTTPS, encrypting data in transit. Add an extra layer of security to your applications using webhook-based request signatures to verify authenticity.

One-Way and Two-Way Messaging

Send one-way texts, or allow customers to reply to you and get real-time assistance, enabling a more personal, conversational interaction that builds trust.

Two-Factor Authentication (2FA)

Fortify your security measures by implementing two-factor authentication and sending one-time passwords (OTPs) or verification codes, preventing unauthorized access and reducing the load off your support team.

Multimedia Messaging Service (MMS)

Enrich your communications with visually compelling content, including links, images, gifs, and videos.

Unicode and GSM support

Use and process any characters across different languages, such as accents, symbols, and emojis.

Sender ID

Drive higher engagement using a recognizable phone number or branded sender ID, improving the customer experience.

Feedback and Surveys

Collect valuable customer feedback with customizable surveys, deepening your understanding of their needs and making them feel heard.

All the use cases you need to scale your communications and drive engagement

Quickly build impactful experiences, deliver time-sensitive information, validate users, and more with just a few lines of code.

Man is using the touch screen on a phone.
Blue concierge bell icon with text reading "Simplify 10DLC registration with concierge service"

Send text messages hassle-free with white-glove support

Evolving requirements for A2P 10DLC messaging can be overwhelming to navigate alone. With deep expertise in SMS/MMS verification, we offer white-glove support to streamline the registration process and ensure your messaging campaigns are compliant and deployed faster.

FreeClimb handles all the complexity of 10DLC for you, including:

Configuring your brand with The Campaign Registry

Submitting your brand for brand vetting

Securing your Brand ID and Identity Status

Monitoring your approval status

Linking your Brand ID to your FreeClimb account

DEVELOPER RESOURCES

Accelerate build time with dev-friendly resources

Programmatically send your first SMS/MMS message in minutes with our detailed documentation, low-code integrations, sample code, and quickstarts. Sign up for free, get a virtual number, and begin testing right away with your free credit balance.

Support for Multiple Languages: Code in your preferred language, including Java, Python, C#, Node.js, PHP, and Ruby.

Real-Time Monitoring: Use webhook logging to monitor and manage call statuses, history, and logs.

Dedicated Integration Support: Get direct-to-engineer support when you need it most.

Computer screen displaying Messaging API page with text “Send and receive SMS and MMS messages in your applications with FreeClimb API.” Displays list of programming languages Node.Js. Java, C#, and Python. Below is text reading “200+ in-house engineers, data scientists, and UX designers.”
Pricing

Save on every message

Customers typically save 30-40% per message segment by switching to FreeClimb. Pay for only what you use with transparent, pay-as-you-go pricing. Get additional discounts as you scale.

$0.006
Outbound
Free
Inbound

Domestic Long-code (10DLC) SMS

$0.013
Outbound
Free
Inbound

Domestic Long-code (10DLC) MMS

$0.0065
Outbound
$0.0065
Inbound

Registered Toll-Free

Enrich your customer communications with programmable messaging

Take advantage of a robust platform and build more impactful interactions with all the tools and support you need. Whether you’re a developer, business owner, or marketer, we’ll have you sending your first message in no time.

Resources

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10DLC Concierge Service

While 10DLC enables businesses to send a high volume of messages at scale, a multi-step sign-up process is required, from Brand and Campaign registration to throughput vetting.

White text overlaying blue background reads "A2P 10DLC Text Messaging Made Easy" with a cog wheel and person icon connected by a green dotted line.
A2P 10DLC Text Messaging Made Easy

A2P 10DLC messaging helps you reach an audience with meaningful and timely messages on the device they use the most. However, 10DLC also requires a special registration process that affects your message deliverability and brand credibility. We made it easier to get set up.

Blue background with white headline reading "SMS: A FreeClimb Guide" beside a graphic of a cell phone with chat box icon.
A2P SMS: A FreeClimb Guide

From marketing campaigns to order confirmations, A2P SMS messaging equips businesses with the power of direct and personalized customer outreach. Find which number best supports your use case, their associated costs, and how FreeClimb can help you scale your campaigns.