Modern IoT API capabilities for fleet management

IoT APIs have evolved well beyond basic data retrieval. In 2026, the APIs that matter most for connected device teams handle the full lifecycle of a fleet, from first activation to ongoing monitoring and firmware updates.

Device management and provisioning

Modern IoT APIs let you activate, pause, suspend, and deactivate SIMs programmatically. Instead of logging into a portal to provision each device by hand, your systems can activate hundreds of SIMs in a single API call. Zero-touch provisioning, where a device connects and self-configures the moment it powers on, is now a baseline expectation for large deployments.

Over-the-air firmware updates

Pushing firmware updates to thousands of devices scattered across the globe requires a reliable, staged rollout process. Device management APIs support targeted updates by device group, region, or firmware version. They also let you monitor update progress and roll back if something goes wrong.

Real-time usage monitoring and alerts

Knowing how much data each device consumes, and catching anomalies before they become problems, is critical for cost control and security. Usage monitoring APIs deliver real-time and historical data consumption metrics, and alert APIs let you set thresholds that trigger notifications or automated actions when usage spikes.

Automated carrier switching

For global deployments, the ability to switch carriers over the air is a game changer. APIs that support eUICC profile management let your systems select the best available carrier based on signal strength, cost, or regional availability, without manual intervention.

Network diagnostics

When a device goes offline, you need to know why. Diagnostic APIs surface connection status, signal quality, last-seen timestamps, and error codes so your team can troubleshoot remotely instead of dispatching a technician.

What is an API

The term API (application programming interface) is the tool software developers use to gather and transfer data from one application or computer to another. Or in other words, APIs enable developers to programmatically interact with software components both inside and outside of their own code.

In IoT specifically, APIs are used to gather and transfer data from the connected device to an application or computer. They are also used to instruct a connected device to take a particular action. Because connected devices can be anywhere in the world, having an API makes it possible to remotely access a device and make the data useful.

For Hologram specifically, we gather and transfer usage data via cellular connectivity and share it in the dashboard. Within the dashboard, users can remotely pause, activate, or deactivate devices; pull reports; and more. The Hologram API enables users to expand on what’s done in the dashboard as well as bring connectivity data directly into their own applications or reports.

How do APIs and IoT work together?

An API is a way to enable users to programmatically access information about their devices and make decisions or take actions based on it. There are an endless number of ways they can work together in IoT. A few examples include:

• Managing a fleet: Everything from activating devices to billing and reporting are all done via the API.
• Preventing fraud: Leveraging the API enables users to create alerts if a device is moved or if a SIM card was stolen. We’ve also seen users configure SMS limits to prevent high data charges if a device is stolen.

While the Hologram Dashboard surfaces all of this information and capabilities, users will leverage the Hologram API to either bring data into their own tools or leverage it as part of their application for their customers. APIs are powerful tools that take the data created at the device level and make it usable.

What is an API endpoint and why is it important?

An API endpoint is the source which you want to get the data from. In more technical terms, it’s an API call. The most obvious API endpoint in IoT is at the device level, gathering data from the connected device. This collects data usage, connectivity status, and any other additional data an IoT application is intending to collect.

Beyond the device endpoint, there are many other useful endpoints within an IoT deployment. For example, a team may use the API to collect data as it relates to billing, making finance reporting programmatic.

Types of IoT APIs

The IoT API landscape has matured significantly. Beyond the foundational REST and MQTT protocols, several newer categories are shaping how teams build connected systems.

Connectivity management APIs

These handle SIM provisioning, carrier switching, data plan assignment, and usage monitoring. They are the backbone of any fleet management workflow. Hologram's REST API falls into this category, covering the full SIM lifecycle from activation to deactivation.

Device lifecycle management APIs

These go beyond connectivity to manage the device itself: firmware versions, configuration profiles, health status, and end-of-life decommissioning. Platforms like AWS IoT and Azure IoT Hub offer device twin capabilities that keep a cloud-side mirror of each device's state.

Edge computing APIs

As processing moves closer to the device, edge APIs handle local data filtering, inference at the edge, and selective data forwarding to the cloud. These reduce bandwidth costs and latency for time-sensitive applications.

Security and identity APIs

IoT SAFE (SIM Applet for Secure End-to-End Communication) and similar standards let devices use the SIM as a hardware root of trust for authentication and encryption. Security APIs manage certificate provisioning, key rotation, and access policies.

Analytics and observability APIs

These aggregate data from across your fleet to surface trends, detect anomalies, and forecast usage. They feed into business intelligence tools and help teams make data-driven decisions about coverage, capacity, and cost.

How Hologram's API powers IoT at scale

Hologram's REST API gives engineering teams direct control over their entire SIM fleet. Here is what you can do with it.

Programmatic SIM activation and management

Activate, pause, or deactivate SIMs through simple API calls. Bulk operations let you manage thousands of devices at once. When a new device powers on, you can auto-activate its SIM and assign it to the right data plan without anyone touching a dashboard.

Real-time usage alerts and automated rules

Set data usage thresholds per device or per fleet. When a device exceeds its threshold, Hologram can send a webhook to your system, trigger an automated pause, or notify your team through your preferred channel. This keeps costs predictable and catches compromised devices fast.

Automated carrier switching

Hologram's API works with eUICC-enabled SIMs to switch carrier profiles programmatically. If a device loses signal on one network, your system can trigger a switch to an alternative carrier, keeping uptime high without manual intervention.

Bulk device management

Managing a fleet of 10 devices is easy. Managing 10,000 requires automation. Hologram's API supports bulk SIM updates, group-level policy changes, and fleet-wide data plan assignments. You can integrate these calls into your existing CI/CD pipelines, monitoring dashboards, or custom fleet management tools.

Webhook support for event-driven workflows

Hologram sends webhooks for key device events: SIM activation, data usage milestones, connection state changes, and more. Pipe these events into your own systems to build automated workflows, feed analytics dashboards, or trigger incident response playbooks.

Recommended webinar: Building on IoT APIs: Real lessons from real production architecture

Frequently Asked Questions

What is an API in the context of IoT?

An API (Application Programming Interface) is a tool that allows software developers to programmatically gather and transfer data between applications or computers. In IoT, APIs are specifically used to remotely access connected devices to collect data (like usage and status) and instruct them to take actions.

What are the main categories of IoT APIs for fleet management in 2026?

The API landscape in 2026 includes several key categories: Connectivity Management (SIM provisioning, usage monitoring), Device Lifecycle Management (firmware updates, health status), Edge Computing (local data filtering), Security and Identity (certificate management), and Analytics/Observability APIs (trend detection).

How does Hologram's API enable fleet automation?

Hologram's REST API allows engineering teams to manage their entire SIM fleet programmatically through simple API calls. This includes bulk activation, pausing, and deactivation of SIMs, setting real-time usage alerts to trigger automated actions, and using webhooks for event-driven workflows like automated troubleshooting and incident response.