Improbable

Improbable (Improbable Worlds Ltd) is a London-based technology company and venture builder. Founded in 2012, it originally built SpatialOS, a distributed simulation and networking platform for large-scale real-time multiplayer games, and later Morpheus / M² (MSquared), a network of interoperable metaverse worlds. Today Improbable operates primarily as a venture builder and capital allocator, partnering with founders to launch and scale companies across AI, Web3 and the metaverse. It is backed by Andreessen Horowitz (a16z) and the SoftBank Vision Fund. Its historical developer surface centered on the SpatialOS Platform SDK, Worker SDK and the `spatial` CLI (distributed via NuGet), plus the improbable-eng and spatialos GitHub organizations; the standalone documentation, status and IMS subdomains have since been retired as the company pivoted away from a standalone developer platform.

Improbable is profiled on the APIs.io network. Tagged areas include Company, Venture Builder, Metaverse, Gaming, and Simulation.

Improbable’s developer surface includes product news, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

13.8/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyVenture BuilderMetaverseGamingSimulationMultiplayerWeb3InfrastructureSDKLondon

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 13.8/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 2.2 / 20

Commercial Clarity 4.2 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

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

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/improbable: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

News

News

Source (apis.yml)

aid: improbable
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/improbable.png
name: Improbable
description: 'Improbable (Improbable Worlds Ltd) is a London-based technology company and venture builder. Founded

  in 2012, it originally built SpatialOS, a distributed simulation and networking platform for large-scale

  real-time multiplayer games, and later Morpheus / M² (MSquared), a network of interoperable metaverse

  worlds. Today Improbable operates primarily as a venture builder and capital allocator, partnering with

  founders to launch and scale companies across AI, Web3 and the metaverse. It is backed by Andreessen

  Horowitz (a16z) and the SoftBank Vision Fund. Its historical developer surface centered on the SpatialOS

  Platform SDK, Worker SDK and the `spatial` CLI (distributed via NuGet), plus the improbable-eng and

  spatialos GitHub organizations; the standalone documentation, status and IMS subdomains have since been

  retired as the company pivoted away from a standalone developer platform.'
url: https://raw.githubusercontent.com/api-evangelist/improbable/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
- softbank-vision-fund
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Venture Builder
- Metaverse
- Gaming
- Simulation
- Multiplayer
- Web3
- Infrastructure
- SDK
- London
apis: []
common:
- type: Website
  url: https://www.improbable.io/
- type: News
  url: https://www.improbable.io/news
- type: Support
  url: https://www.improbable.io/contact
- type: TermsOfService
  url: https://www.improbable.io/terms-of-service
- type: PrivacyPolicy
  url: https://www.improbable.io/privacy-policy
- type: GitHubOrganization
  url: https://github.com/improbable-eng
- type: Packages
  url: packages/improbable-packages.yml
- type: SDKs
  url: packages/improbable-packages.yml
- type: DomainSecurity
  url: security/improbable-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence