V2JSON (SkyV2X)

V2JSON (SkyV2X) provides a free online V2X message codec that converts ETSI C‑ITS UPER binary streams to structured JSON and back. It supports a wide range of message types including CAM, DENM, CPM, VAM, MAPEM, SPATEM, SREM, SSEM, IVIM and RTCMEM, offering byte‑exact round‑trip verification. The service is publicly accessible via a REST API with endpoints for decode, encode, and verify, and requires no API key. Documentation is available through a Swagger UI at /docs, and the company also offers an interactive web‑based codec interface.

V2JSON (SkyV2X) publishes 1 API contract indexed on the APIs.io network: Decode API. Tagged areas include V2X, C-ITS, ETSI, Codec, and Free.

The V2JSON (SkyV2X) catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

V2JSON (SkyV2X)’s developer surface includes documentation and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.1/100 emerging ▬ flat Agent 22/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessOpen

1 published contract

V2XC-ITSETSICodecFree

Kin Score

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

Composite quality — 23.1/100 · emerging

Contract Quality 10.1 / 19

Developer Ergonomics 0.7 / 15

Access Clarity 0.0 / 15

Operational Transparency 0.0 / 10

Contract Governance 2.0 / 9

Discoverability 5.5 / 8

Regulatory Posture 1.6 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 22/100 · 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 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% 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
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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

10 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 4.8 — up to +19.0 composite points
Operational Transparency scores 0.0 — up to +13.0 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/v2json/apis.yml: open an issue on github.com/api-evangelist/v2json 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 1

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

V2JSON (SkyV2X) Decode API

The decode API from V2JSON (SkyV2X) — 6 operation(s) for decode.

Semantic Vocabularies 1

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

V2Json Context

11 classes · 25 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

V2JSON (SkyV2X) API Rules

14 rules · 12 errors 1 warnings 1 info

SPECTRAL

JSON Schema 6

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

DecodeRequest

3 properties

JSON SCHEMA

DecodeResponse

5 properties

JSON SCHEMA

EncodeRequest

2 properties

JSON SCHEMA

EncodeResponse

4 properties

JSON SCHEMA

HealthResponse

3 properties

JSON SCHEMA

VerifyResponse

5 properties

JSON SCHEMA

Security Posture 1

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

V2Json Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

V2Json Agentic Access

6 operations · 3 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

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: v2json
name: V2JSON (SkyV2X)
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - security
  generated: '2026-11-06'
  method: derived
image: https://v2json.skyv2x.com/v2json-asn1-to-json-decoder-v3.jpg
description: V2JSON (SkyV2X) provides a free online V2X message codec that converts ETSI C‑ITS UPER binary streams to structured
  JSON and back. It supports a wide range of message types including CAM, DENM, CPM, VAM, MAPEM, SPATEM, SREM, SSEM, IVIM
  and RTCMEM, offering byte‑exact round‑trip verification. The service is publicly accessible via a REST API with endpoints
  for decode, encode, and verify, and requires no API key. Documentation is available through a Swagger UI at /docs, and the
  company also offers an interactive web‑based codec interface.
url: https://raw.githubusercontent.com/api-evangelist/v2json/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-11'
modified: '2026-10-11'
tags:
- V2X
- C-ITS
- ETSI
- Codec
- Free
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/v2json-agentic-access.yml
- type: Spectral
  url: rules/v2json-rules.yml
- type: JSONLD
  url: json-ld/v2json-context.jsonld
- type: Vocabulary
  url: vocabulary/v2json-vocabulary.yml
- type: DataModel
  url: data-model/v2json-data-model.yml
- type: ErrorCatalog
  url: errors/v2json-problem-types.yml
- type: Conformance
  url: conformance/v2json-conformance.yml
- type: LLMsTxt
  url: llms/v2json-llms.txt
- type: Hosts
  url: hosts/v2json-hosts.yml
- type: DomainSecurity
  url: security/v2json-domain-security.yml
- type: Website
  url: https://v2json.skyv2x.com/
- type: Documentation
  url: https://v2json.skyv2x.com/docs
apis:
- aid: v2json:v2json-decode-api
  name: V2JSON (SkyV2X) Decode API
  description: The decode API from V2JSON (SkyV2X) — 6 operation(s) for decode.
  humanURL: https://v2json.skyv2x.com/
  baseURL: https://v2json.skyv2x.com/api/v1
  tags:
  - Decode
  tags_raw:
  - decode
  properties:
  - type: OpenAPI
    url: openapi/v2json-decode-api-openapi.yml
  - type: Documentation
    url: https://v2json.skyv2x.com/docs
  - type: JSONSchema
    url: json-schema/v2json-decode-request-schema.json
  - type: JSONSchema
    url: json-schema/v2json-verify-response-schema.json
  - type: JSONSchema
    url: json-schema/v2json-decode-response-schema.json
  - type: JSONSchema
    url: json-schema/v2json-encode-response-schema.json
  - type: JSONSchema
    url: json-schema/v2json-encode-request-schema.json
  - type: JSONSchema
    url: json-schema/v2json-health-response-schema.json
x-submission-notes: V2X UPER<->JSON codec, ETSI C-ITS, free no key; ships apis.json (aid skyv2x.com:v2json)
x-submission-probe: apis.json 200, docs 200 (Swagger UI), OpenAPI 3.1.0 200 (6 ops), invented path 404 JSON
x-submitted-by: contact@blackcycle.ai (apis.io/add, 2026-10-10)
x-enrichment:
  date: '2026-10-11'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

V2JSON (SkyV2X) API — frequently asked questions

Does V2JSON (SkyV2X) have an API?

Yes. APIs.io lists 1 API from V2JSON (SkyV2X), including V2JSON (SkyV2X) Decode API.

Is there an OpenAPI specification for the V2JSON (SkyV2X) API?

Yes. APIs.io indexes 1 OpenAPI specification for V2JSON (SkyV2X), each linked for download from this page.

Is the V2JSON (SkyV2X) API ready for AI agents?

V2JSON (SkyV2X) has a Kin Score of 23.1 out of 100 (emerging) and an Agent Readiness score of 22.2 (agent-aware), scored by API Evangelist on 2026-11-06.

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