Blacksmith

Blacksmith runs your GitHub Actions up to 2x faster at half the cost on a fleet of modern gaming-CPU bare metal, booting ephemeral Firecracker microVMs in under three seconds. It is a drop-in replacement integrated as a GitHub App and selected via runs-on runner tags, with a co-located CI cache, 40x faster Docker layer caching, sticky disks, an observability dashboard, and a Testbox CLI. Blacksmith does not publish a general-purpose public REST API - integration is GitHub-App, YAML runner-tag, and GitHub Actions based.

Blacksmith publishes 5 APIs on the APIs.io network, including GitHub Actions Runners, Docker Builds, Cache, and 2 more. Tagged areas include CI/CD, GitHub Actions, Runners, Caching, and Docker.

Blacksmith’s developer surface includes authentication, documentation, developer console, status page, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.6/100 thin ▬ flat Agent 23/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

CI/CD GitHub Actions Runners Caching Docker Developer Tools

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 33.6/100 · thin

Contract Quality 5.3 / 21

Developer Ergonomics 5.3 / 17

Access Clarity 7.5 / 17

Operational Transparency 3.4 / 11

Contract Governance 0.0 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.0 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 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 6 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/.

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/blacksmith-sh: 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 →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

Blacksmith GitHub Actions Runners

Drop-in faster GitHub-hosted runner replacement selected by changing the runs-on tag (e.g. blacksmith-2vcpu-ubuntu-2404). Linux/Windows jobs run in ephemeral Firecracker microVM...

Blacksmith Docker Builds

Accelerated Docker image builds via Blacksmith's BuildKit and the useblacksmith/build-push-action and useblacksmith/setup-docker-builder GitHub Actions, reusing cached layers on...

Blacksmith Cache

Co-located CI cache that transparently backs official GitHub and popular third-party cache actions (e.g. actions/cache, useblacksmith/cache) at roughly 400MB/s, plus Sticky Disk...

Blacksmith Testbox CLI

Command-line interface (beta) that lets coding agents run CI against local changes instantly - blacksmith testbox warmup/run/status dispatch a workflow to a warm microVM, rsync ...

Blacksmith Dashboard and Observability

Web dashboard at app.blacksmith.sh for organization setup, runner and cache management, and observability - CI analytics, run history, logs, machine metrics, monitors, SSH acces...

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Blacksmith

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Blacksmith Sh Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Blacksmith Sh Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Blacksmith Sh Finops

FINOPS

Security Posture 3

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

Blacksmith Sh Authentication

oauth2 · 1 scheme

SECURITY

Blacksmith Sh Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Blacksmith Sh Trust Center

SOC 2, ISO 27001, HIPAA, GDPR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Blacksmith Sh Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 1

Portal, sign-up, and the first successful call

Console

Console

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 4

Authentication, authorization, and security posture

TrustCenter

DomainSecurity

Authentication

OAuthScopes

Operate 2

Status, limits, changes, and where to get help

Status

Status

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: blacksmith-sh
url: https://raw.githubusercontent.com/api-evangelist/blacksmith-sh/refs/heads/main/apis.yml
name: Blacksmith
kind: company
description: Blacksmith runs your GitHub Actions up to 2x faster at half the cost on a fleet of modern gaming-CPU bare metal,
  booting ephemeral Firecracker microVMs in under three seconds. It is a drop-in replacement integrated as a GitHub App and
  selected via runs-on runner tags, with a co-located CI cache, 40x faster Docker layer caching, sticky disks, an observability
  dashboard, and a Testbox CLI. Blacksmith does not publish a general-purpose public REST API - integration is GitHub-App,
  YAML runner-tag, and GitHub Actions based.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/blacksmith-sh.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-09-20
tags:
- CI/CD
- GitHub Actions
- Runners
- Caching
- Docker
- Developer Tools
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.23'
apis:
- aid: blacksmith-sh:github-actions-runners
  name: Blacksmith GitHub Actions Runners
  tags:
  - GitHub Actions
  - Runners
  - CI/CD
  - Firecracker
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.blacksmith.sh/blacksmith-runners/overview
  baseURL: https://app.blacksmith.sh
  properties:
  - url: https://docs.blacksmith.sh/blacksmith-runners/overview
    type: Documentation
  - url: https://docs.blacksmith.sh/introduction/quickstart
    type: APIReference
  - url: openapi/_original/blacksmith-sh-openapi.yml
    type: OpenAPI
  description: Drop-in faster GitHub-hosted runner replacement selected by changing the runs-on tag (e.g. blacksmith-2vcpu-ubuntu-2404).
    Linux/Windows jobs run in ephemeral Firecracker microVMs; x64, ARM64, and macOS (Apple Silicon M4) families are offered
    in 2-32 vCPU sizes. Configured via the GitHub App and YAML workflow, not a programmatic REST API.
- aid: blacksmith-sh:docker-builds
  name: Blacksmith Docker Builds
  tags:
  - Docker
  - BuildKit
  - Layer Caching
  - Builds
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.blacksmith.sh/blacksmith-caching/docker-builds
  baseURL: https://app.blacksmith.sh
  properties:
  - url: https://docs.blacksmith.sh/blacksmith-caching/docker-builds
    type: Documentation
  - url: openapi/_original/blacksmith-sh-openapi.yml
    type: OpenAPI
  description: Accelerated Docker image builds via Blacksmith's BuildKit and the useblacksmith/build-push-action and useblacksmith/setup-docker-builder
    GitHub Actions, reusing cached layers on sticky disks to rebuild only what changed - up to 40x faster. Used as GitHub
    Actions in a workflow, not via a public REST API.
- aid: blacksmith-sh:cache
  name: Blacksmith Cache
  tags:
  - Cache
  - Sticky Disks
  - Dependencies
  - Artifacts
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.blacksmith.sh/blacksmith-caching/dependencies-actions
  baseURL: https://app.blacksmith.sh
  properties:
  - url: https://docs.blacksmith.sh/blacksmith-caching/dependencies-actions
    type: Documentation
  - url: openapi/_original/blacksmith-sh-openapi.yml
    type: OpenAPI
  description: Co-located CI cache that transparently backs official GitHub and popular third-party cache actions (e.g. actions/cache,
    useblacksmith/cache) at roughly 400MB/s, plus Sticky Disks, container init pre-hydration, and Git checkout caching. Activated
    by running cache GitHub Actions on Blacksmith runners, not via a public REST API.
- aid: blacksmith-sh:testbox-cli
  name: Blacksmith Testbox CLI
  tags:
  - CLI
  - Testbox
  - Coding Agents
  - Beta
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.blacksmith.sh/blacksmith-testbox/cli
  baseURL: https://app.blacksmith.sh
  properties:
  - url: https://docs.blacksmith.sh/blacksmith-testbox/cli
    type: Documentation
  - url: https://docs.blacksmith.sh/blacksmith-testbox/overview
    type: APIReference
  description: Command-line interface (beta) that lets coding agents run CI against local changes instantly - blacksmith testbox
    warmup/run/status dispatch a workflow to a warm microVM, rsync local changes, and execute commands over SSH. The CLI is
    the programmatic surface; there is no documented public REST API.
- aid: blacksmith-sh:dashboard
  name: Blacksmith Dashboard and Observability
  tags:
  - Dashboards
  - Observability
  - Analytics
  - Management
  tags_raw:
  - Dashboard
  - Observability
  - Analytics
  - Management
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.blacksmith.sh/blacksmith-observability/dashboard
  baseURL: https://app.blacksmith.sh
  properties:
  - url: https://docs.blacksmith.sh/blacksmith-observability/dashboard
    type: Documentation
  - url: https://app.blacksmith.sh
    type: Console
  description: Web dashboard at app.blacksmith.sh for organization setup, runner and cache management, and observability -
    CI analytics, run history, logs, machine metrics, monitors, SSH access, and test analytics. A management console, not
    a documented public REST API.
common:
- type: TrustCenter
  url: security/blacksmith-sh-trust-center.yml
- type: DomainSecurity
  url: security/blacksmith-sh-domain-security.yml
- type: Authentication
  url: authentication/blacksmith-sh-authentication.yml
- type: OAuthScopes
  url: scopes/blacksmith-sh-scopes.yml
- type: GitHubOrganization
  url: https://github.com/useblacksmith
- type: LinkedIn
  url: https://www.linkedin.com/company/useblacksmith
- type: Website
  url: https://www.blacksmith.sh/
- type: Documentation
  url: https://docs.blacksmith.sh
- type: Console
  url: https://app.blacksmith.sh
- type: Status
  url: https://status.blacksmith.sh
- type: Plans
  url: plans/blacksmith-sh-plans-pricing.yml
- type: RateLimits
  url: rate-limits/blacksmith-sh-rate-limits.yml
- type: FinOps
  url: finops/blacksmith-sh-finops.yml
- type: Blog
  url: https://www.blacksmith.sh/blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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