Clockwork Labs

Clockwork Labs is a San Francisco software company (founded 2019) that builds SpacetimeDB, a relational database that is also an application server: developers upload their schema and server-side business logic as a WebAssembly "module" (written in Rust, C#, TypeScript, or C++) directly into the database, and clients connect over WebSocket to invoke reducers and subscribe to real-time state updates with no separate application server in between. SpacetimeDB exposes a versioned HTTP API (/v1/database and /v1/identity) for publishing modules, invoking reducers, running SQL, streaming subscriptions, and managing identities and JWT tokens, plus a first-party `spacetime` CLI and client SDKs for TypeScript, C#/Unity, Rust, Python, and C++. It is the production backend of BitCraft, the company's MMO. Clockwork Labs is backed by a16z, Supercell, Firstminute Capital, Skycatcher, 1Up Ventures, and Supernode.

Clockwork Labs publishes 1 API on the APIs.io network. Tagged areas include Company, Database, Real-Time, WebSocket, and Game Backend.

Clockwork Labs’ developer surface includes documentation, API reference, getting-started guide, engineering blog, support, pricing, signup flow, and 21 more developer resources.

🌐 Visit website 📡 Source on GitHub
39.1/100 thin Agent 38/100 agent aware Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyDatabaseReal-TimeWebSocketGame BackendMultiplayerServerlessWebAssemblyDeveloper ToolsInfrastructure

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 39.1/100 · thin
Contract Quality 0.0 / 25
Developer Ergonomics 16.1 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 4.8 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 38/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 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/clockwork-labs: 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

SpacetimeDB HTTP API

The SpacetimeDB HTTP API lets clients and tools interact with SpacetimeDB databases: publish and delete database modules, manage database names, retrieve schema and logs, invoke...

MCP Servers

clockwork-labs-mcp.yml

MCP SERVER

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 Conformance
Conformance
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 ChangeLog
ChangeLog

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Other 1

Properties that don't map to a standard resource type

OpenIDConnect
OpenIDConnect

Source (apis.yml)

apis.yml Raw ↑ 
aid: clockwork-labs
name: Clockwork Labs
description: 'Clockwork Labs is a San Francisco software company (founded 2019) that builds SpacetimeDB, a relational database
  that is also an application server: developers upload their schema and server-side business logic as a WebAssembly "module"
  (written in Rust, C#, TypeScript, or C++) directly into the database, and clients connect over WebSocket to invoke reducers
  and subscribe to real-time state updates with no separate application server in between. SpacetimeDB exposes a versioned
  HTTP API (/v1/database and /v1/identity) for publishing modules, invoking reducers, running SQL, streaming subscriptions,
  and managing identities and JWT tokens, plus a first-party `spacetime` CLI and client SDKs for TypeScript, C#/Unity, Rust,
  Python, and C++. It is the production backend of BitCraft, the company''s MMO. Clockwork Labs is backed by a16z, Supercell,
  Firstminute Capital, Skycatcher, 1Up Ventures, and Supernode.'
image: https://spacetimedb.com/og-home.png
url: https://raw.githubusercontent.com/api-evangelist/clockwork-labs/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- Database
- Real-Time
- WebSocket
- Game Backend
- Multiplayer
- Serverless
- WebAssembly
- Developer Tools
- Infrastructure
apis:
- name: SpacetimeDB HTTP API
  description: 'The SpacetimeDB HTTP API lets clients and tools interact with SpacetimeDB databases: publish and delete database
    modules, manage database names, retrieve schema and logs, invoke reducers, run SQL queries, open real-time subscription
    WebSockets, and create/verify Spacetime identities and JWT tokens. Authentication is a Bearer JWT (SpacetimeAuth/OIDC,
    or an anonymously generated identity token). Base host is the hosted SpacetimeDB Cloud (Maincloud); the same API is served
    by any self-hosted `spacetime start` instance.'
  humanURL: https://spacetimedb.com/docs/http/database/
  baseURL: https://maincloud.spacetimedb.com
  tags:
  - Database
  - Real-Time
  - WebSocket
  - Identity
  properties:
  - type: Documentation
    url: https://spacetimedb.com/docs/http/database/
  - type: APIReference
    url: https://spacetimedb.com/docs/http/database/
  - type: Authentication
    url: authentication/clockwork-labs-authentication.yml
  - type: ErrorCatalog
    url: errors/clockwork-labs-problem-types.yml
  - type: Conventions
    url: conventions/clockwork-labs-conventions.yml
  - type: Conformance
    url: conformance/clockwork-labs-conformance.yml
  - type: MCPServer
    url: mcp/clockwork-labs-mcp.yml
common:
- type: DeveloperPortal
  url: https://spacetimedb.com/docs
- type: Documentation
  url: https://spacetimedb.com/docs
- type: APIReference
  url: https://spacetimedb.com/docs/http/database/
- type: GettingStarted
  url: https://spacetimedb.com/docs/
- type: GitHubOrganization
  url: https://github.com/clockworklabs
- type: Blog
  url: https://spacetimedb.com/blog
- type: Support
  url: https://discord.gg/spacetimedb
- type: StatusPage
  url: https://status.spacetimedb.com
- type: Pricing
  url: https://spacetimedb.com/pricing
- type: SignUp
  url: https://spacetimedb.com/login
- type: Login
  url: https://spacetimedb.com/login
- type: TermsOfService
  url: https://spacetimedb.com/terms-of-service
- type: PrivacyPolicy
  url: https://spacetimedb.com/privacy
- type: LLMsTxt
  url: llms/clockwork-labs-llms.txt
- type: Packages
  url: packages/clockwork-labs-packages.yml
- type: SDKs
  url: packages/clockwork-labs-packages.yml
- type: CLI
  url: cli/clockwork-labs-cli.yml
- type: WellKnown
  url: well-known/clockwork-labs-well-known.yml
- type: Authentication
  url: authentication/clockwork-labs-authentication.yml
- type: OpenIDConnect
  url: well-known/clockwork-labs-openid-configuration.json
- type: ErrorCatalog
  url: errors/clockwork-labs-problem-types.yml
- type: Conventions
  url: conventions/clockwork-labs-conventions.yml
- type: Conformance
  url: conformance/clockwork-labs-conformance.yml
- type: Lifecycle
  url: lifecycle/clockwork-labs-lifecycle.yml
- type: ChangeLog
  url: changelog/clockwork-labs-changelog.yml
- type: MCPServer
  url: mcp/clockwork-labs-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DomainSecurity
  url: security/clockwork-labs-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