# Second Life Registration API

**Canonical:** https://apis.io/apis/linden-lab/second-life-registration-api/  
**Provider:** Linden Lab — https://apis.io/providers/linden-lab/  
**Base URL:** https://cap.secondlife.com  
**Documentation:** https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API

Second Life Registration API is one of 5 APIs that [Linden Lab](https://apis.io/providers/linden-lab/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Registration, Identity, and Onboarding. The published artifact set on APIs.io includes API documentation and an API reference.

Registers new Second Life residents from a third-party web page. Capability based — credentials are POSTed to a capability-minting endpoint which returns per-operation unguessable capability URLs for create_user, check_name, add_to_group, get_last_names and get_error_codes. LLSD XML request and response bodies, with a published catalog of 59 numeric error codes the API will also enumerate for you at runtime. Access is granted by application, reviewed by Linden Lab.

## Machine-readable artifacts (5)

- **Documentation** — https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API
- **APIReference** — https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API_Reference
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/linden-lab/refs/heads/main/errors/linden-lab-error-codes.yml
- **SourceCode** — https://github.com/secondlife/registration-api-examples
- **SignUp** — https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API_Request_Form

## Other Linden Lab APIs (4)

- [Second Life Live Data Feeds](https://apis.io/apis/linden-lab/second-life-live-data-feeds/)
- [Second Life Name to Agent ID API](https://apis.io/apis/linden-lab/second-life-name-to-agent-id-api/)
- [Second Life Map API](https://apis.io/apis/linden-lab/second-life-map-api/)
- [Second Life Marketplace Automatic Notification System](https://apis.io/apis/linden-lab/second-life-marketplace-automatic-notification-system/)

## Tags

Registration, Identity, Onboarding

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/linden-lab/second-life-registration-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/linden-lab/.