Linden Lab

Linden Lab is the San Francisco company that created and has continuously operated Second Life since 2003 — the largest and longest-running user-built 3D virtual world, with its own economy, land market and L$ currency. Its public API surface is small and old, documented in prose on the Second Life wiki rather than in any machine-readable contract: anonymous Live Data Feeds publishing grid statistics and LindeX currency-market data, an api-key-authenticated username to agent-UUID lookup, a capability-based Registration API for creating accounts from a third-party site, an embeddable Leaflet-based Map API, and an outbound Marketplace webhook. Linden Lab also publishes the Second Life viewer, the LSL and SLua scripting documentation, and the LLSD serialization libraries on GitHub. It no longer owns Tilia, its former payments subsidiary, which was sold to Thunes in 2024.

Linden Lab publishes 5 APIs on the APIs.io network. Tagged areas include Virtual Worlds, Metaverse, Gaming, 3D, and Social.

The Linden Lab catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Linden Lab’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 25 more developer resources.

🌐 Visit website 📡 Source on GitHub

59.4/100 strong ▬ flat Agent 26/100 agent aware saas Full breakdown ↓
scored 2026-09-01 · rubric v0.17.2

5 APIs

Virtual Worlds Metaverse Gaming 3D Social Virtual Economy Digital Currency Marketplace Scripting User Generated Content

Kin Score

Kin Score How this is scored →
scored 2026-09-01 · rubric v0.17.2

Composite quality — 59.4/100 · strong

Contract Quality 12.3 / 25

Developer Ergonomics 14.3 / 20

Access Clarity 15.3 / 20

Operational Transparency 9.6 / 13

Contract Governance 0.5 / 12

Discoverability 7.4 / 10

Agent readiness — 26/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/linden-lab: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Examples 1

Example request and response payloads for these APIs.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

ErrorCatalog

Lifecycle

Conventions

Conformance

Components

DataModel

Webhooks

Scroll for all 7

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

Examples

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: linden-lab
name: Linden Lab
description: 'Linden Lab is the San Francisco company that created and has continuously operated Second Life since 2003 —
  the largest and longest-running user-built 3D virtual world, with its own economy, land market and L$ currency. Its public
  API surface is small and old, documented in prose on the Second Life wiki rather than in any machine-readable contract:
  anonymous Live Data Feeds publishing grid statistics and LindeX currency-market data, an api-key-authenticated username
  to agent-UUID lookup, a capability-based Registration API for creating accounts from a third-party site, an embeddable Leaflet-based
  Map API, and an outbound Marketplace webhook. Linden Lab also publishes the Second Life viewer, the LSL and SLua scripting
  documentation, and the LLSD serialization libraries on GitHub. It no longer owns Tilia, its former payments subsidiary,
  which was sold to Thunes in 2024.'
url: https://raw.githubusercontent.com/api-evangelist/linden-lab/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
image: https://cdn.prod.website-files.com/6285718b944b3be2fa795ac1/62d0ba8168ea16a1021fd9e9_ll-webclip.png
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-25'
modified: '2026-08-25'
tags:
- Virtual Worlds
- Metaverse
- Gaming
- 3D
- Social
- Virtual Economy
- Digital Currency
- Marketplace
- Scripting
- User Generated Content
apis:
- name: Second Life Live Data Feeds
  description: Anonymous, unauthenticated feeds publishing live Second Life grid statistics (grid status, total registered
    accounts, avatars currently inworld) and LindeX currency-market data (limit and market buy/sell rate ranges and volumes
    over the last hour, last day and today, plus the best-10-percent offer book). Served in three formats — a bespoke two-line
    key/value text format, plain XML, and LLSD XML. Signups update daily, the inworld count every 3 minutes, LindeX every
    15 minutes. The only Second Life API reachable with no credential of any kind.
  humanURL: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Live_Data_Feeds
  baseURL: https://api.secondlife.com/datafeeds
  tags:
  - Statistics
  - Virtual Economy
  - Currency
  - Open Data
  properties:
  - type: Documentation
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Live_Data_Feeds
  - type: Examples
    url: examples/linden-lab-examples.yml
  - type: TermsOfService
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:API_Terms_of_Use
- name: Second Life Name to Agent ID API
  description: Resolves a Second Life username, with an optional last name defaulting to "Resident", to the avatar's agent
    UUID. A JSON POST authenticated with an api-key header issued from the account console. Rate limited to 2 requests per
    second, returning 403 on exhaustion. The most modern endpoint on Linden Lab's surface and the only one with a JSON error
    envelope.
  humanURL: https://wiki.secondlife.com/wiki/Name_to_agent_ID_API
  baseURL: https://api.secondlife.com
  tags:
  - Identity
  - Lookup
  properties:
  - type: Documentation
    url: https://wiki.secondlife.com/wiki/Name_to_agent_ID_API
  - type: SignUp
    url: https://accounts.secondlife.com/manage_api_key
  - type: RateLimits
    url: rate-limits/linden-lab-rate-limits.yml
  - type: ErrorCatalog
    url: errors/linden-lab-error-codes.yml
- name: Second Life Registration API
  description: 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.
  humanURL: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API
  baseURL: https://cap.secondlife.com
  tags:
  - Registration
  - Identity
  - Onboarding
  properties:
  - type: Documentation
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API
  - type: APIReference
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API_Reference
  - type: ErrorCatalog
    url: errors/linden-lab-error-codes.yml
  - type: SourceCode
    url: https://github.com/secondlife/registration-api-examples
  - type: SignUp
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Registration_API_Request_Form
- name: Second Life Map API
  description: Embeds an interactive map of the Second Life world into a web page. A Leaflet-based JavaScript component (SLMap,
    gotoSLURL, setView) backed by two JSONP capability endpoints on cap.secondlife.com that translate between region names
    and grid coordinates. Paired with the SLurl deep-link scheme that opens a specific inworld location in the viewer.
  humanURL: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Map_API
  baseURL: https://map.secondlife.com
  tags:
  - Maps
  - Geospatial
  - Embeddable
  properties:
  - type: Documentation
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Map_API_Introduction
  - type: APIReference
    url: https://wiki.secondlife.com/wiki/Linden_Lab_Official:Map_API_Reference
  - type: Components
    url: components/linden-lab-components.yml
- name: Second Life Marketplace Automatic Notification System
  description: An outbound webhook that forwards information about every sale made on the Second Life Marketplace to a merchant-configured
    external URL. Delivers Purchase and Redelivery transaction records carrying currency, gross and fee amounts, payer, receiver
    and merchant UUIDs, transaction and item identifiers, validated by an X-ANS-Verify-Hash SHA1 header checked against a
    merchant-specific salt.
  humanURL: https://wiki.secondlife.com/wiki/Direct_Delivery_and_Automatic_Notification_System
  baseURL: https://marketplace.secondlife.com
  tags:
  - Webhook
  - Marketplace
  - Commerce
  - Notification
  tags_raw:
  - Webhooks
  - Marketplace
  - Commerce
  - Notifications
  properties:
  - type: Webhooks
    url: asyncapi/linden-lab-ans-webhooks.yml
  - type: Documentation
    url: https://wiki.secondlife.com/wiki/Direct_Delivery_and_Automatic_Notification_System
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/linden-lab-domain-security.yml
- type: Website
  url: https://lindenlab.com/
- type: DeveloperPortal
  url: https://wiki.secondlife.com/wiki/APIs_and_Web_Services_Portal
- type: Documentation
  url: https://create.secondlife.com/script/lsl-reference/
- type: APIReference
  url: https://wiki.secondlife.com/wiki/Category:APIs
- type: GettingStarted
  url: https://create.secondlife.com/script/
- type: Support
  url: https://lindenlab.freshdesk.com/support/home
- type: Blog
  url: https://community.secondlife.com/blogs/
- type: GitHubOrganization
  url: https://github.com/secondlife
- type: Pricing
  url: https://secondlife.com/premium
- type: SignUp
  url: https://join.secondlife.com/
- type: TermsOfService
  url: https://lindenlab.com/tos
- type: PrivacyPolicy
  url: https://lindenlab.com/privacy
- type: StatusPage
  url: https://status.secondlifegrid.net/
- type: ChangeLog
  url: changelog/linden-lab-changelog.yml
- type: Packages
  url: packages/linden-lab-packages.yml
- type: SDKs
  url: packages/linden-lab-packages.yml
- type: Authentication
  url: authentication/linden-lab-authentication.yml
- type: RateLimits
  url: rate-limits/linden-lab-rate-limits.yml
- type: Plans
  url: plans/linden-lab-plans-pricing.yml
- type: ErrorCatalog
  url: errors/linden-lab-error-codes.yml
- type: Lifecycle
  url: lifecycle/linden-lab-lifecycle.yml
- type: Conventions
  url: conventions/linden-lab-conventions.yml
- type: Conformance
  url: conformance/linden-lab-conformance.yml
- type: Sandbox
  url: sandbox/linden-lab-sandbox.yml
- type: Components
  url: components/linden-lab-components.yml
- type: DataModel
  url: data-model/linden-lab-data-model.yml
- type: Examples
  url: examples/linden-lab-examples.yml
- type: Webhooks
  url: asyncapi/linden-lab-ans-webhooks.yml
- type: LLMsTxt
  url: llms/linden-lab-llms.txt
- type: Security
  url: security/linden-lab-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/linden-lab-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-08-25'
  status: enriched
  artifacts_added: 25
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/linden-lab"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/linden-lab/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/linden-lab/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

Linden Lab

Kin Score

APIs 5

Second Life Live Data Feeds

Second Life Name to Agent ID API

Second Life Registration API

Second Life Map API

Second Life Marketplace Automatic Notification System

Pricing Plans 1

Linden Lab Plans Pricing

Rate Limits 1

Linden Lab Rate Limits

Event Specifications 1

Linden Lab Ans Webhooks

Examples 1

Linden Lab Status

Security Posture 4

Linden Lab Authentication

Linden Lab Domain Security

Linden Lab Vulnerability Disclosure

Linden Lab Trust Center

Resources