Tonk

Tonk, built by Tonk Labs, is an open-source containerized format, host environment, and protocol for multiplayer, local-first software you keep and share like files. A .tonk bundle packages an application together with its data into a single self-contained file that runs anywhere, works offline, and stays under user control. It is built on a document-based virtual file system using Automerge CRDTs, a browser/WebAssembly runtime compiled from Rust, and peer-to-peer synchronization through WebSocket relays. Tonk ships first-party npm client libraries, a CLI, a sync relay, an authentication library, and an MCP worker rather than a hosted REST API. Backed by Electric Capital.

Tonk is profiled on the APIs.io network. Tagged areas include Company, Developer Tools, Local-First, CRDT, and Collaboration.

Tonk’s developer surface includes documentation, getting-started guide, support, CLI, and 8 more developer resources.

🌐 Visit website 📡 Source on GitHub
18.3/100 emerging ▬ flat Agent 12/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs 1 MCP Servers
CompanyDeveloper ToolsLocal-FirstCRDTCollaborationOpen SourceData SyncWebAssembly

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 18.3/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 10.9 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 0.7 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 12/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 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/tonk: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

tonk-mcp.yml

MCP SERVER

Security Posture 1

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

Tonk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 CLI
CLI

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support
Support

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: tonk
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/tonk.png
name: Tonk
description: Tonk, built by Tonk Labs, is an open-source containerized format, host environment, and protocol for multiplayer,
  local-first software you keep and share like files. A .tonk bundle packages an application together with its data into a
  single self-contained file that runs anywhere, works offline, and stays under user control. It is built on a document-based
  virtual file system using Automerge CRDTs, a browser/WebAssembly runtime compiled from Rust, and peer-to-peer synchronization
  through WebSocket relays. Tonk ships first-party npm client libraries, a CLI, a sync relay, an authentication library, and
  an MCP worker rather than a hosted REST API. Backed by Electric Capital.
url: https://raw.githubusercontent.com/api-evangelist/tonk/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- electric-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Developer Tools
- Local-First
- CRDT
- Collaboration
- Open Source
- Data Sync
- WebAssembly
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://tonk.xyz/
- type: DeveloperPortal
  url: https://tonk.xyz/
- type: Documentation
  url: https://tonk-labs.github.io/tonk
- type: GettingStarted
  url: https://tonk-labs.github.io/tonk/quickstart.html
- type: GitHubOrganization
  url: https://github.com/tonk-labs
- type: Support
  url: https://discord.gg/cHqkYpRE
- type: Packages
  url: packages/tonk-packages.yml
- type: SDKs
  url: packages/tonk-packages.yml
- type: CLI
  url: cli/tonk-cli.yml
- type: MCPServer
  url: mcp/tonk-mcp.yml
- type: LLMsTxt
  url: llms/tonk-llms.txt
- type: DomainSecurity
  url: security/tonk-domain-security.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 6
  pass: local-v1