Dylibso

Dylibso, Inc. is the company behind Extism, the open-source, cross-language framework for building with WebAssembly (Wasm). Its focus is AI-driven application extensibility: giving developers an off-the-shelf, secure-by-default, fully sandboxed plug-in system that is "just a library import away" and runs almost anywhere, with idiomatic Host SDKs for JavaScript, Python, Rust, Ruby, Go, .NET, PHP, Java, C/C++, OCaml, Haskell, Perl, and Zig. Beyond Extism, Dylibso builds Chicory (a native pure-JVM WebAssembly runtime) and Turbo MCP (formerly mcp.run / XTP), a standards-compliant, self-hosted Model Context Protocol gateway and management platform with OIDC identity integration and audit controls. Dylibso is backed by Felicis.

Dylibso is profiled on the APIs.io network. Tagged areas include Company, WebAssembly, Wasm, Extensibility, and Plugins.

Dylibso’s developer surface includes documentation, getting-started guide, engineering blog, support, sandbox, changelog, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

18.0/100 emerging ▬ flat Agent 0/100 human only self hosted · BSD-3-Clause Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

0 APIs

Company WebAssembly Wasm Extensibility Plugins Developer Tools SDK MCP Open-Source Artificial Intelligence

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 18.0/100 · emerging

Contract Quality 0.0 / 23

Developer Ergonomics 8.1 / 18

Access Clarity 0.0 / 18

Operational Transparency 2.2 / 12

Contract Governance 0.0 / 11

Discoverability 5.2 / 9

Open Source Surface 2.5 / 10

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

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against 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 90 points between them, because the conditional facet above carries the other 10. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 90% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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 github.com/api-evangelist/dylibso: open an issue to ask a question, or submit a pull request to add artifacts. 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.

Dylibso Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Sandbox

Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SourceCode

Packages

SDKs

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

IssueTracker

Releases

Support

Community

ChangeLog

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 3

The organization behind the API

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Source (apis.yml)

aid: dylibso
name: Dylibso
description: 'Dylibso, Inc. is the company behind Extism, the open-source, cross-language framework for building with WebAssembly
  (Wasm). Its focus is AI-driven application extensibility: giving developers an off-the-shelf, secure-by-default, fully sandboxed
  plug-in system that is "just a library import away" and runs almost anywhere, with idiomatic Host SDKs for JavaScript, Python,
  Rust, Ruby, Go, .NET, PHP, Java, C/C++, OCaml, Haskell, Perl, and Zig. Beyond Extism, Dylibso builds Chicory (a native pure-JVM
  WebAssembly runtime) and Turbo MCP (formerly mcp.run / XTP), a standards-compliant, self-hosted Model Context Protocol gateway
  and management platform with OIDC identity integration and audit controls. Dylibso is backed by Felicis.'
url: https://raw.githubusercontent.com/api-evangelist/dylibso/refs/heads/main/apis.yml
deliveryModel:
  model: self-hosted
  license: BSD-3-Clause
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
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://avatars.githubusercontent.com/u/109687654?v=4
x-type: company
x-source: vc-portfolio
x-backed-by:
- felicis
x-tier: enriched
x-tier-reason: portfolio-lead
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-18'
tags:
- Company
- WebAssembly
- Wasm
- Extensibility
- Plugins
- Developer Tools
- SDK
- MCP
- Open-Source
- Artificial Intelligence
tags_raw:
- Company
- WebAssembly
- Wasm
- Extensibility
- Plug-ins
- Developer Tools
- SDKs
- Model Context Protocol
- Open Source
- AI
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: IssueTracker
  url: https://github.com/extism/extism/issues
- type: Releases
  url: https://github.com/extism/extism/releases
- type: License
  name: BSD-3-Clause
  url: https://github.com/extism/extism/blob/main/LICENSE
- type: Website
  url: https://dylibso.ai
- type: DeveloperPortal
  url: https://extism.org
- type: Documentation
  url: https://extism.org/docs/overview
- type: GettingStarted
  url: https://extism.org/docs/category/quickstart
- type: Blog
  url: https://extism.org/blog
- type: BlogRSS
  url: https://extism.org/blog/rss.xml
- type: GitHubOrganization
  url: https://github.com/dylibso
- type: SourceCode
  url: https://github.com/extism/extism
- type: Support
  url: https://github.com/extism/extism/discussions
- type: Community
  url: https://discord.gg/cx3usBCWnc
- type: Sandbox
  url: https://playground.extism.org
- type: Packages
  url: packages/dylibso-packages.yml
- type: SDKs
  url: packages/dylibso-packages.yml
- type: ChangeLog
  url: changelog/dylibso-changelog.yml
- type: LLMsTxt
  url: llms/dylibso-llms.txt
- type: DomainSecurity
  url: security/dylibso-domain-security.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/dylibso"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/dylibso/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/dylibso/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.