# Blacksmith

**Canonical:** https://apis.io/providers/blacksmith-sh/  
**Website:** https://www.blacksmith.sh/  
**APIs profiled:** 5

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.

## Kin Score — 33.3 / 100 (thin)

Scored 2026-08-21 under rubric 0.12.0. Trend: flat (+0.0 from 33.3).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 28.7 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 34.2 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 47.4 |
| Access Clarity | 47.4 |

## Agent readiness — 26.9 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (5)

- **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...

## Security (3)

- **Blacksmith Sh Authentication** — oauth2 · 1 scheme
- **Blacksmith Sh Domain Security** — TLSv1.3 · HSTS · DMARC
- **Blacksmith Sh Trust Center** — SOC 2, ISO 27001, HIPAA, GDPR

## Plans (1)

- **Blacksmith Sh Plans Pricing**

## Tags

CI/CD, GitHub Actions, Runners, Caching, Docker

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/blacksmith-sh/). Scores are computed from the provider's own public artifacts under a published rubric.