Developer API · REST · sandbox · webhooks

Global eSIMs,
one API call away.

Add eSIM connectivity in 200+ countries to your own app or platform. Sandbox keys with a full test-mode lifecycle, webhooks, and an MCP server so your AI assistant can build with you.

Free sandbox 0 real charges in test mode MCP + llms.txt built in
01 The API

Everything the platform does,
as endpoints.

Catalog, orders, daily plans, usage, top-ups, cancellations, webhooks and key management — the same backend that powers every YFi store.

Swipe to explore
Sandbox first

Test keys that can't hurt you.

yf_test_ keys run the full lifecycle — real catalog, real pricing math, identical responses — with zero charges, zero real eSIMs and a hard server-side wall from production.

Build with AI

Your AI already knows this API.

Point any assistant at /llms.txt, or connect our MCP server and Claude can browse plans and place sandbox orders for you while you build.

Set up in your dashboard →
Webhooks

Real-time events, signed.

Order and delivery events pushed to your endpoint with HMAC signatures, a delivery log, and one-click test deliveries.

Idempotent by design

Retry without fear.

Pass a dealer_reference and retries return the original order — no double-charges, no duplicate eSIMs.

02 Ship it

Sandbox today.
Production when you're ready.

STEP / 001

Get keys

Sign up, open your dashboard, generate live and test keys. The sandbox tester runs the whole cycle in one click.

STEP / 002

Build in test mode

Integrate against yf_test_ — orders, usage, top-ups, webhooks — with no risk of real charges.

STEP / 003

Go live

Swap to your live key. Same endpoints, same shapes — now provisioning real eSIMs at wholesale rates.

03 Start

First sandbox order
in the next ten minutes.

Free sandbox, full documentation, and an AI-ready API surface.