Limbo Labs (limbolabs.com)

Limbo Labs was, in its own words, "a small technical team in san francisco" whose products were to "begin launching in july 2010". The company surfaced in the 500 Global portfolio listing and was added to the API Evangelist network as a lead. Enrichment found no company to enrich: limbolabs.com carried a single-page placeholder from 2010 through roughly 2015 and never grew past it — an Internet Archive enumeration of the domain returns only eleven distinct captured URLs, all of them the one landing page plus its stylesheets, jQuery and four images. No product, developer portal, API reference, OpenAPI or Swagger document, SDK or machine-readable specification was ever published or archived. By 2018 the domain served a JavaScript-wall parking page, and it now redirects to an Afternic "for sale" lander, so the brand is retired. The website URL carried on the inbound 500 Global portfolio record, readyforzero.com, is a mis-joined row: it belongs to ReadyForZero, a separate 500 Global personal-finance company, and it no longer resolves. This profile is retained as a historical, defunct-provider record with no active API surface.

Limbo Labs (limbolabs.com) is profiled on the APIs.io network. Tagged areas include Company, Defunct, San Francisco, and Software.

🌐 Visit website 📡 Profile data on GitHub

0.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs

Company Defunct San Francisco Software

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 0.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 0.0 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 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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<a href="https://apis.io/providers/limbo-labs/"><img src="https://apis.io/badge/limbo-labs/card.svg" alt="Limbo Labs (limbolabs.com) on APIs.io — Kin Score by API Evangelist"></a>

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 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/limbo-labs/apis.yml: open an issue on github.com/api-evangelist/limbo-labs 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 →

Security Posture 1

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

Limbo Labs Domain Security

TLSv1.3

SECURITY

Resources

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Lifecycle

Lifecycle

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Company 1

The organization behind the API

Website

Website

Source (apis.yml)

aid: limbo-labs
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/limbo-labs.png
name: Limbo Labs (limbolabs.com)
description: 'Limbo Labs was, in its own words, "a small technical team in san francisco" whose products were to "begin launching
  in july 2010". The company surfaced in the 500 Global portfolio listing and was added to the API Evangelist network as a
  lead. Enrichment found no company to enrich: limbolabs.com carried a single-page placeholder from 2010 through roughly 2015
  and never grew past it — an Internet Archive enumeration of the domain returns only eleven distinct captured URLs, all of
  them the one landing page plus its stylesheets, jQuery and four images. No product, developer portal, API reference, OpenAPI
  or Swagger document, SDK or machine-readable specification was ever published or archived. By 2018 the domain served a JavaScript-wall
  parking page, and it now redirects to an Afternic "for sale" lander, so the brand is retired. The website URL carried on
  the inbound 500 Global portfolio record, readyforzero.com, is a mis-joined row: it belongs to ReadyForZero, a separate 500
  Global personal-finance company, and it no longer resolves. This profile is retained as a historical, defunct-provider record
  with no active API surface.'
url: https://raw.githubusercontent.com/api-evangelist/limbo-labs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
x-tier: historical
x-tier-reason: defunct-no-api-surface
x-status: defunct
x-status-note: limbolabs.com redirects to an Afternic domain-sale lander; no successor company or acquirer was identified.
x-headquarters: San Francisco, California, United States
x-api-surface: none
x-enrichment-note: Inbound portfolio record listed https://readyforzero.com as the website; that domain is NXDOMAIN and belongs
  to a different 500 Global company (ReadyForZero). Corrected to the company's own historical domain, limbolabs.com.
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Defunct
- San Francisco
- Software
tags_raw:
- Company
- Defunct
- San Francisco
- Venture Backed
- Software
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://limbolabs.com
- type: Lifecycle
  url: lifecycle/limbo-labs-lifecycle.yml
- type: DomainSecurity
  url: security/limbo-labs-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence
x-tags-removed:
- Startups
x-company-stage: venture-backed
x-company-stage-evidence: 'own tags: Startup, Venture Backed'

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