5arz

5arz provides a proof‑of‑human service that verifies a real person behind online interactions. Their platform offers APIs to confirm human presence, Know‑Your‑Agent verification, and human‑labeled data for AI agents. Built as a free, privacy‑first solution, 5arz signs cryptographic seals proving personhood without storing personal data. The company targets developers, businesses, and AI platforms needing trustworthy human verification, offering documentation, pricing, and support openly.

5arz publishes 2 API contracts indexed on the APIs.io network, including Proof-of-Human API API, and 1 more. Tagged areas include Human Verification, Artificial Intelligence, Privacy, Developer Tools, and Authentication.

The 5arz catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

5arz’s developer surface includes support, pricing, API reference, and 21 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

36.8/100 thin ▼ -8.0 Agent 14/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

Human VerificationArtificial Intelligence Privacy Developer Tools Authentication

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 36.8/100 · thin

Contract Quality 9.9 / 21

Developer Ergonomics 2.2 / 17

Access Clarity 9.8 / 17

Operational Transparency 0.6 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.2 / 15

Agent readiness — 14/100 · agent aware

Machine-Readable Contract 18 / 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 8 / 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

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/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/5arz-com/"><img src="https://apis.io/badge/5arz-com/card.svg" alt="5arz on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
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)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 13.1 — up to +17.4 composite points
Contract Quality scores 46.7 — up to +13.3 composite points
Operational Transparency scores 5.3 — up to +12.3 composite points

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.

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/5arz-com/apis.yml: open an issue on github.com/api-evangelist/5arz-com 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

5arz Proof-of-Human API

Proof‑of‑human service API providing human verification and credential issuance.

5arz Proof-of-Human API API

5arz is the proof-of-human layer for the internet. It issues **Proof-of-Human-Fulfillment (PoHF)** credentials: ES256-signed JWTs asserting that a real, ID-verified, live human ...

5arz API pricing

Prices published by 5arz, read 2026-10-31 from 5arz.com/pricing.

Plan	Price
Free	$0 forever
Starter	$99/mo
Growth	$499/mo
Scale	$2,499/mo

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

5Arz Com Plans Pricing

4 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

5Arz Com Context

3 classes · 14 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

5arz API Rules

13 rules · 10 errors 2 warnings 1 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

Credential

7 properties

JSON SCHEMA

HolderJwk

4 properties

JSON SCHEMA

Security Posture 2

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

5Arz Com Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

5Arz Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

Conformance

DataModel

ErrorCatalog

Build 1

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Access & Security 5

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: 5arz-com
name: 5arz
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://5arz.com/assets/og/home.jpg
description: 5arz provides a proof‑of‑human service that verifies a real person behind online interactions. Their platform
  offers APIs to confirm human presence, Know‑Your‑Agent verification, and human‑labeled data for AI agents. Built as a free,
  privacy‑first solution, 5arz signs cryptographic seals proving personhood without storing personal data. The company targets
  developers, businesses, and AI platforms needing trustworthy human verification, offering documentation, pricing, and support
  openly.
url: https://artifacts.apis.io/5arz-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-31 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Human Verification
- Artificial Intelligence
- Privacy
- Developer Tools
- Authentication
tags_raw:
- Human Verification
- AI
- Privacy
- Developer Tools
- Authentication
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/5arz-com-rules.yml
- type: JSONLD
  url: json-ld/5arz-com-context.jsonld
- type: Vocabulary
  url: vocabulary/5arz-com-vocabulary.yml
- type: Conformance
  url: conformance/5arz-com-conformance.yml
- type: Plans
  url: plans/5arz-com-plans-pricing.yml
- type: DataModel
  url: data-model/5arz-com-data-model.yml
- type: Security
  url: https://5arz.com/terms
- type: ErrorCatalog
  url: errors/5arz-com-problem-types.yml
- type: LLMsTxt
  url: llms/5arz-com-llms.txt
- type: SecurityTxt
  url: well-known/5arz-com-security.txt
- type: WellKnown
  url: well-known/5arz-com-well-known.yml
- type: Hosts
  url: hosts/5arz-com-hosts.yml
- type: Vendors
  url: vendors/5arz-com-vendors.yml
- type: TrustCenter
  url: https://5arz.com/trust
- type: TermsOfService
  url: https://5arz.com/terms
- type: Support
  url: https://5arz.com/help
- type: SDKs
  url: https://5arz.com/sdk/sarz.js
- type: PrivacyPolicy
  url: https://5arz.com/privacy
- type: Pricing
  url: https://5arz.com/pricing
- type: Login
  url: https://5arz.com/signin
- type: APIReference
  url: https://5arz.com/docs
- type: VulnerabilityDisclosure
  url: security/5arz-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/5arz-com-domain-security.yml
- type: Website
  url: https://5arz.com/
apis:
- name: 5arz Proof-of-Human API
  description: Proof‑of‑human service API providing human verification and credential issuance.
  humanURL: https://5arz.com/docs
  baseURL: https://api.5arz.com
  aid: 5arz-com:5arz-proof-of-human-api
- aid: 5arz-com:5arz-proof-of-human-api-api
  name: 5arz Proof-of-Human API API
  description: '5arz is the proof-of-human layer for the internet. It issues **Proof-of-Human-Fulfillment (PoHF)** credentials:
    ES256-signed JWTs

    asserting that a real, ID-verified, live human — not a bot or AI agent — performed a specific action (work, a view, a
    presence event, or a

    personhood check). Anyone can v'
  humanURL: https://5arz.com/docs
  baseURL: https://api.5arz.com
  properties:
  - type: OpenAPI
    url: openapi/_original/5arz-com-api-openapi.json
  - type: JSONSchema
    url: json-schema/5arz-com-credential-schema.json
  - type: JSONSchema
    url: json-schema/5arz-com-holder-jwk-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 17
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

5arz API — frequently asked questions

Does 5arz have an API?

Yes. APIs.io lists 2 APIs from 5arz, including 5arz Proof-of-Human API and 5arz Proof-of-Human API API.

Is there an OpenAPI specification for the 5arz API?

Yes. APIs.io indexes 1 OpenAPI specification for 5arz, each linked for download from this page.

How much does the 5arz API cost?

5arz publishes its prices; its Free plan is $0 forever as of 2026-10-31. APIs.io lists 4 pricing plans for 5arz, with each plan's price, limits and inclusions under Pricing on this page.

Is the 5arz API ready for AI agents?

5arz has a Kin Score of 36.8 out of 100 (thin) and an Agent Readiness score of 13.7 (agent-aware), scored by API Evangelist on 2026-11-06.

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/5arz-com"

All providers

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

Every operation they expose

curl "https://apis.io/api/v1/providers/5arz-com/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/5arz-com/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

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.