The eSIM API built for shipping, not waiting
Most eSIM APIs are a single carrier wrapped in a REST endpoint. One integration with Firsty gives you every network we run, with ML-based routing that picks the best carrier per session.
Built to ship in a weekend
Self-serve sandbox, no card
Sign up, get a key, provision your first test eSIM in minutes.
One global rate
One rate, every market. No 200-country pricing tables.
Multi-MNO routing per session
We route through many operators automatically. If one network degrades, traffic moves.
Real-time CDRs and usage
Pull live usage through the API. Build dashboards, set caps, trigger top-ups.
Tier-1 carriers, direct
Direct IMSI sponsorship, not resold capacity.
From key to live eSIM in four calls
- 01
Authenticate
JWT, scoped per environment.
- 02
Provision
One call returns a QR or activation code.
- 03
Activate
User installs, live in seconds.
- 04
Manage
Top up, suspend, swap IMSI over the air, cancel, all via API.
What teams build on the eSIM API
- Travel eSIMs
- IoT fleets
- Fintech backup data
- Voice and data for AI agents
Self-serve sandbox is free
No card, no contract.