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 is listed with 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 📡 Profile data on GitHub

60.4/100 strong ▬ flat Agent 26/100 agent aware Front door AI 2/6 trace Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

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 2026-11-02 · rubric v0.26.0

Composite quality — 60.4/100 · strong

Contract Quality 9.6 / 21

Developer Ergonomics 12.1 / 17

Access Clarity 13.0 / 17

Operational Transparency 8.1 / 11

Contract Governance 0.5 / 10

Discoverability 6.1 / 9

Regulatory Posture 4.6 / 15

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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 45.3 — up to +13.7 composite points
Contract Governance scores 4.5 — up to +11.5 composite points
Developer Ergonomics scores 71.4 — up to +5.7 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/linden-lab/apis.yml: open an issue on github.com/api-evangelist/linden-lab to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Gaming, Entertainment and Sports	undeclared	-	-	-
XR & Graphics (XR, 3D, GPU graphics)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

APIs 5

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

Second Life Live Data Feeds

Anonymous, unauthenticated feeds publishing live Second Life grid statistics (grid status, total registered accounts, avatars currently inworld) and LindeX currency-market data ...

Second Life Name to Agent ID API

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 th...

Second Life Registration API

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 unguessab...

Second Life Map API

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 ...

Second Life Marketplace Automatic Notification System

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 transa...

Pricing Plans 2

Published pricing tiers and plan structures.

Linden Lab Plans Pricing

4 plans

PLANS

Linden Lab Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Linden Lab Rate Limits

1 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Linden Lab Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Linden Lab Ans Webhooks

ASYNCAPI

Examples 1

Example request and response payloads for these APIs.

Linden Lab Status

2 fields

EXAMPLE

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Linden Lab Authentication

4 schemes

SECURITY

Linden Lab Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Linden Lab Vulnerability Disclosure

Hackerone

SECURITY

Linden Lab Trust Center

trust center published

SECURITY

Resources

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
  license_evidence:
    not_product:
    - secondlife/registration-api-examples
  open_source: unknown
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-02'
  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

Linden Lab API — frequently asked questions

Does Linden Lab have an API?

Yes. APIs.io lists 5 APIs from Linden Lab, including Second Life Live Data Feeds, Second Life Name to Agent ID API and Second Life Registration API, and 2 more.

How do I authenticate with the Linden Lab API?

Linden Lab uses bearer-token authentication (4 schemes). The details are profiled on APIs.io as Linden Lab Authentication.

How much does the Linden Lab API cost?

APIs.io lists 4 pricing plans for Linden Lab, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the Linden Lab API ready for AI agents?

Linden Lab has a Kin Score of 60.4 out of 100 (strong) and an Agent Readiness score of 26.4 (agent-aware), scored by API Evangelist on 2026-11-02.

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