2. Migrating from V2 to V3
The FastConnect V2 EOL timeline, key differences from V3, and migration support.
How long will FastConnect V2 remain supported? Do I have to migrate to V3?
Yes — FastConnect V3 is SSI's official API platform and long-term direction, replacing V2. The published timeline:
| Phase | Timing | Details |
|---|---|---|
| 1 | Until 31/12/2026 | SSI continues bug-fix support for FastConnect V2 |
| 2 | From 01/01/2027 | No new features will be developed for V2 |
| 3 | Until 30/06/2027 | The V2 system remains operational |
| — | Before 30/06/2027 | All customers must complete migration to V3 |
We recommend starting your migration planning early to allow enough time for integration and testing.
What's different in V3 compared to V2? Is it worth migrating?
Some key differences:
- One API system + one API Key set + a single WebSocket connection for both equity and derivative trading — V2 required integrating multiple separate systems/URLs per data type.
- A dedicated Developer Portal — self-service API Key management, fully online registration/activation, no more looking things up on iBoard like in V2.
- 4 official SDKs (Python, Go, Node.js, C#) with tutorials and samples close to real-world use cases.
- Transparent rate limiting via
X-RATELIMIT-*response headers — track your quota directly instead of guessing. - Interactive API documentation (API Explorer) — inspect schemas and try requests directly on the docs site.
Can I reuse my FastConnect V2 API Key in V3?
Yes — you can keep using your existing V2 FCTrading key set in V3.
I'm currently using V2 FCTrading/FCData — do I need to reactivate for FastConnect V3?
If you already have the V2 service activated, you don't need to register again for FastConnect V3.
Will I get technical support during migration?
Yes. SSI's technical team is available throughout your integration and testing process. For specific migration planning, contact your account's RM/Sales team, or the technical support channels in "3. Technical Integration Issues".