Etch

Etch provides a signed audit chain for AI agent decisions, enabling offline verification of events against pinned public keys. It uses a hybrid Ed25519 + FIPS 205 SLH-DSA-SHA2-128f envelope, Merkle chaining, and anchors epochs on Sigstore Rekor and Bitcoin OpenTimestamps, offering independent evidence without trusting the vendor.

Etch publishes 4 API contracts indexed on the APIs.io network, including Auditor API, Discovery API, Onboarding API, and 1 more. Tagged areas include Artificial Intelligence, Security, Auditing, Blockchain, and Open Source.

The Etch catalog on APIs.io includes 1 Spectral governance ruleset.

Etch’s developer surface includes documentation, getting-started guide, pricing, signup flow, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

38.7/100 thin Agent 21/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 published contract

Artificial Intelligence Security Auditing Blockchain Open Source Company

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 38.7/100 · thin

Contract Quality 9.1 / 21

Developer Ergonomics 3.6 / 17

Access Clarity 9.8 / 17

Operational Transparency 1.0 / 11

Contract Governance 2.2 / 10

Discoverability 6.5 / 9

Regulatory Posture 3.0 / 15

Agent readiness — 21/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 7 / 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 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

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 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 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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 21.4 — up to +15.7 composite points Ask about this →
Contract Quality scores 42.6 — up to +14.4 composite points Ask about this →
Operational Transparency scores 9.5 — up to +11.8 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/etch-systems/apis.yml: open an issue on github.com/api-evangelist/etch-systems to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 4

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

Etch Auditor API

Public verification surface: pinnable public keys, OSS-format manifest, browser chain-integrity endpoint.

Etch Discovery API

Well-known metadata endpoints for aggregators and MCP clients.

Etch Onboarding API

Zero-signup path to a signed audit chain.

Etch Portable identity API

Track B v1.0+v1.1 portable per-agent identity: mint, session, rotate, grant/revoke, delegated write.

Etch API pricing

Prices published by Etch, read 2026-11-07 from etch.systems/pricing.

Plan	Price
Free	$0 hosted, evaluation
Pilot	$499 per project/ month
Enterprise	Contact quarterly billing

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Etch Plans Pricing

3 plans

PLANS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Etch API Rules

47 rules · 45 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 3

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

Etch Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Etch Vulnerability Disclosure

security.txt · contact published

SECURITY

Etch Trust Center

SOC 2, HIPAA

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Etch Agentic Access

12 operations · 6 acting · 1 human-in-the-loop

12 operations · 6 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Vocabulary

Vocabulary

Conformance

Conformance

Access & Security 6

Authentication, authorization, and security posture

Compliance

SecurityTxt

Security

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

Pricing

Pricing

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: etch-systems
name: Etch
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://etch.systems/static/site/og/home.png
description: Etch provides a signed audit chain for AI agent decisions, enabling offline verification of events against pinned
  public keys. It uses a hybrid Ed25519 + FIPS 205 SLH-DSA-SHA2-128f envelope, Merkle chaining, and anchors epochs on Sigstore
  Rekor and Bitcoin OpenTimestamps, offering independent evidence without trusting the vendor.
url: https://artifacts.apis.io/etch-systems/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-07 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-07'
modified: '2026-11-07'
tags:
- Artificial Intelligence
- Security
- Auditing
- Blockchain
- Open Source
- Company
tags_raw:
- AI
- Security
- Auditing
- Blockchain
- OpenSource
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/etch-systems-agentic-access.yml
- type: Plans
  url: plans/etch-systems-plans-pricing.yml
- type: Spectral
  url: rules/etch-systems-rules.yml
- type: Vocabulary
  url: vocabulary/etch-systems-vocabulary.yml
- type: Compliance
  url: https://etch.systems/compliance
- type: Conformance
  url: conformance/etch-systems-conformance.yml
- type: LLMsTxt
  url: llms/etch-systems-llms.txt
- type: SecurityTxt
  url: well-known/etch-systems-security.txt
- type: WellKnown
  url: well-known/etch-systems-well-known.yml
- type: Hosts
  url: hosts/etch-systems-hosts.yml
- type: Security
  url: https://etch.systems/security
- type: TrustCenter
  url: security/etch-systems-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/etch-systems-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/etch-systems-domain-security.yml
- type: Website
  url: https://etch.systems/
- type: Documentation
  url: https://etch.systems/docs
- type: GettingStarted
  url: https://etch.systems/docs/quickstart
- type: Pricing
  url: https://etch.systems/pricing
- type: SignUp
  url: https://etch.systems/signup
apis:
- aid: etch-systems:etch-systems-auditor-api
  name: Etch Auditor API
  description: 'Public verification surface: pinnable public keys, OSS-format manifest, browser chain-integrity endpoint.'
  humanURL: https://etch.systems/docs
  baseURL: https://etch.systems
  tags:
  - Auditor
  properties:
  - type: OpenAPI
    url: openapi/etch-systems-auditor-api-openapi.yml
- aid: etch-systems:etch-systems-discovery-api
  name: Etch Discovery API
  description: Well-known metadata endpoints for aggregators and MCP clients.
  humanURL: https://etch.systems/docs
  baseURL: https://etch.systems
  tags:
  - Discovery
  properties:
  - type: OpenAPI
    url: openapi/etch-systems-discovery-api-openapi.yml
- aid: etch-systems:etch-systems-onboarding-api
  name: Etch Onboarding API
  description: Zero-signup path to a signed audit chain.
  humanURL: https://etch.systems/docs
  baseURL: https://etch.systems
  tags:
  - Onboarding
  properties:
  - type: OpenAPI
    url: openapi/etch-systems-onboarding-api-openapi.yml
- aid: etch-systems:etch-systems-portable-identity-api
  name: Etch Portable identity API
  description: 'Track B v1.0+v1.1 portable per-agent identity: mint, session, rotate, grant/revoke, delegated write.'
  humanURL: https://etch.systems/docs
  baseURL: https://etch.systems
  tags:
  - Portable identity
  properties:
  - type: OpenAPI
    url: openapi/etch-systems-portable-identity-api-openapi.yml
x-enrichment:
  date: '2026-11-07'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Etch API — frequently asked questions

Does Etch have an API?

Yes. APIs.io lists 4 APIs from Etch, including Etch Auditor API, Etch Discovery API and Etch Onboarding API, and 1 more.

Is there an OpenAPI specification for the Etch API?

Yes. APIs.io indexes 4 OpenAPI specifications for Etch, each linked for download from this page.

How much does the Etch API cost?

Etch publishes its prices; its Free plan is $0 hosted, evaluation as of 2026-11-07. APIs.io lists 3 pricing plans for Etch, with each plan's price, limits and inclusions under Pricing on this page.

Is the Etch API ready for AI agents?

Etch has a Kin Score of 38.7 out of 100 (thin) and an Agent Readiness score of 20.8 (agent-aware), scored by API Evangelist on 2026-11-13.

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