API
One API. Every telecom product. Full white-label. Two weeks to launch.
FULL PLATFORM, ONE API
Every product in the Firsty suite through a single API, fully white-labeled with your brand, your pricing, and your experience. Most partners are live in two weeks. Building telecom infrastructure takes years. Firsty's API gives you the full platform in a fraction of the time.
For your users
BRANDED EXPERIENCE
A fully branded telecom experience inside your product.
FULL SUITE ACCESS
Access to the full Firsty suite under your brand.
GLOBAL CONNECTIVITY
High-performance connectivity globally.
For you as a partner
White-label
Full white-label customisation of every Firsty product, from interface to checkout.
Fast & Documented
Sub 1 second API response time, with full developer documentation at developers.firsty.app.
Sandbox ready
Full sandbox and testing environment to validate your integration before going live.
99% Uptime
99% uptime SLA backed by enterprise-grade telecom infrastructure.
Two-week launch
Two week integration timeline from kickoff to live in production.
BUILT FOR EVERY USER MOMENT
A new global telecom infrastructure, accessible through one API. Built from the ground up by ex Adyen lead engineers to handle data, eSIM, and calling at scale, with the reliability and performance of a modern platform.
How it works
Build telecom into your product. Live in two weeks.
Explore the documentation
Understand the API
Visit developers.firsty.app to understand the full API capability.
Recieve SANDBOX
Request access
Test your integration in a full sandbox environment before going live.
BUILD YOUR INTEGRATION
Connect everything
Connect eSIM, local plans, calling, network switching, and any other Firsty products you need.
Go live
Launch in weeks
Most partners complete integration within two weeks.
Proof points
Integrate the full Firsty suite through one API and ship telecom in your product within two weeks. Sub 1 second response time, a full sandbox environment, and 99% uptime, all on infrastructure built for scale.
4.8
Out of 5 on Trustpilot
1.2 M +
Users on the Firsty platform
Build once, scale globally. Trusted by Uber, Grab, Mastercard, Belfius, and Siemens.
“Amsterdam-based telecom startup Firsty raises €5.1M Seed funding”
"Potential telcomarketdisruptor Firsty immediately brings in €1.1 Million"
"Belfius partners with Dutch eSIM disruptor Firsty for free global app access"
"Five million in growth capital for a Dutch eSIM provider"
“Why We Invested in Firsty: Democratizing Global Mobile Data with eSims”
"Nifty eSIM provider offers free mobile data for life wherever you are"
“Amsterdam-based telecom startup Firsty raises €5.1M Seed funding”
"Potential telcomarketdisruptor Firsty immediately brings in €1.1 Million"
"Belfius partners with Dutch eSIM disruptor Firsty for free global app access"
"Five million in growth capital for a Dutch eSIM provider"
“Why We Invested in Firsty: Democratizing Global Mobile Data with eSims”
"Nifty eSIM provider offers free mobile data for life wherever you are"
join the revolution
Ready to build your own telecom product? Drop us a line at partners@firsty.app
Questions about the api?
We know, it sounds too good to be true. But it’s real. Here’s how.