Crosscheck

Crosscheck provides independent AI‑agent verification services. Users can submit drafts, code, or other content and receive a JSON verdict plus an Ed25519‑signed receipt proving the check. The platform operates on the x402 payment model, accepting USDC on Base and Base Sepolia, and requires no account or API key. It offers endpoints for checking, accepting, skill verification, seller checks, and receipt validation, all documented at https://crosscheckapi.com.

Crosscheck publishes 14 API contracts indexed on the APIs.io network, including Accept API, Accept Lite API, acceptance test API, and 11 more. Tagged areas include Artificial Intelligence, Verification, Payments, x402, and Blockchain.

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

Crosscheck’s developer surface includes authentication and 14 more developer resources.

🌐 Visit website📡 Profile data on GitHub
24.7/100 emerging Agent 29/100 agent ready Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →
AccessOpen
1 published contract 1 Agent Skills
Artificial IntelligenceVerificationPaymentsx402Blockchain

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0
Composite quality — 24.7/100 · emerging
Contract Quality 10.3 / 21
Developer Ergonomics 3.5 / 17
Access Clarity 0.0 / 17
Operational Transparency 0.0 / 11
Contract Governance 2.2 / 10
Discoverability 5.6 / 9
Regulatory Posture 2.1 / 15
Agent readiness — 29/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 7 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 8 / 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 Payments 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. Kin Score badge preview for Crosscheck It updates itself when the score changes. Paste this where you link to your API docs: 
<a href="https://apis.io/providers/crosscheckapi-com/"><img src="https://apis.io/badge/crosscheckapi-com/card.svg" alt="Crosscheck on APIs.io — Kin Score by API Evangelist"></a>
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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
  • 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)
  • Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
  • Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
  • Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
  • Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
6 more unmet checks in the Agent Readiness table above.
Kin Score — facets with the most composite points still available (weight × headroom):
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/crosscheckapi-com/apis.yml: open an issue on github.com/api-evangelist/crosscheckapi-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 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.

Agent2Agent
measured — observed by APIs.io (conformant)
OpenAPI
measured — observed by APIs.io (published)

APIs 14

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

Crosscheck Accept API

The Accept API from Crosscheck — 1 operation(s) for accept.

Crosscheck Accept Lite API

The Accept Lite API from Crosscheck — 1 operation(s) for accept lite.

Crosscheck acceptance test API

The acceptance test API from Crosscheck — 2 operation(s) for acceptance test.

Crosscheck Checks API

The Checks API from Crosscheck — 1 operation(s) for checks.

Crosscheck draft review API

The draft review API from Crosscheck — 1 operation(s) for draft review.

Crosscheck Quote API

The Quote API from Crosscheck — 1 operation(s) for quote.

Crosscheck Receipts API

The Receipts API from Crosscheck — 1 operation(s) for receipts.

Crosscheck Sellercheck API

The Sellercheck API from Crosscheck — 2 operation(s) for sellercheck.

Crosscheck Sellerwatch API

The Sellerwatch API from Crosscheck — 1 operation(s) for sellerwatch.

Crosscheck skill security API

The skill security API from Crosscheck — 2 operation(s) for skill security.

Crosscheck Skillcheck API

The Skillcheck API from Crosscheck — 2 operation(s) for skillcheck.

Crosscheck Skillcheck Lite API

The Skillcheck Lite API from Crosscheck — 1 operation(s) for skillcheck lite.

Crosscheck W API

The W API from Crosscheck — 1 operation(s) for w.

Crosscheck x402 seller API

The x402 seller API from Crosscheck — 2 operation(s) for x402 seller.

Scroll for all 14

Agent Skills 1

Packaged agent skills for driving this provider's APIs from an AI assistant.

check

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Crosscheck API Rules

48 rules · 46 errors 1 warnings 1 info

SPECTRAL

Security Posture 2

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

Crosscheckapi Com Authentication

http · 1 scheme

SECURITY

Crosscheckapi Com Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

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

Crosscheckapi Com Agentic Access

19 operations · 15 acting · 4 human-in-the-loop

19 operations · 15 acting

AGENTIC

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral
Spectral
 Vocabulary
Vocabulary
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs
SDKs
 Packages
Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Company 1

The organization behind the API

Website
Website

Other 3

Properties that don't map to a standard resource type

AgentCard
AgentCard
 Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: crosscheckapi-com
name: Crosscheck
accessModel:
  pricing: unknown
  onboarding: open
  trial: false
  try_now: false
  public: true
  gated: none
  gated_source:
  - onboarding
  label: Open access
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://crosscheckapi.com/icon.png
description: Crosscheck provides independent AI‑agent verification services. Users can submit drafts, code, or other content
  and receive a JSON verdict plus an Ed25519‑signed receipt proving the check. The platform operates on the x402 payment model,
  accepting USDC on Base and Base Sepolia, and requires no account or API key. It offers endpoints for checking, accepting,
  skill verification, seller checks, and receipt validation, all documented at https://crosscheckapi.com.
url: https://artifacts.apis.io/crosscheckapi-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-04 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-04'
modified: '2026-11-04'
tags:
- Artificial Intelligence
- Verification
- Payments
- x402
- Blockchain
tags_raw:
- AI
- Verification
- Payments
- x402
- Blockchain
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/crosscheckapi-com-agentic-access.yml
- type: Spectral
  url: rules/crosscheckapi-com-rules.yml
- type: Vocabulary
  url: vocabulary/crosscheckapi-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: ErrorCatalog
  url: errors/crosscheckapi-com-problem-types.yml
- type: Conformance
  url: conformance/crosscheckapi-com-conformance.yml
- type: LLMsTxt
  url: llms/crosscheckapi-com-llms.txt
- type: AgentCard
  url: a2a/crosscheckapi-com-a2a.yml
- type: Hosts
  url: hosts/crosscheckapi-com-hosts.yml
- type: Vendors
  url: vendors/crosscheckapi-com-vendors.yml
- type: SDKs
  url: packages/crosscheckapi-com-packages.yml
- type: Packages
  url: packages/crosscheckapi-com-packages.yml
- type: Authentication
  url: authentication/crosscheckapi-com-authentication.yml
- type: DomainSecurity
  url: security/crosscheckapi-com-domain-security.yml
- type: Website
  url: https://crosscheckapi.com/
apis:
- aid: crosscheckapi-com:crosscheckapi-com-accept-api
  name: Crosscheck Accept API
  description: The Accept API from Crosscheck — 1 operation(s) for accept.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Accept
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-accept-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-accept-lite-api
  name: Crosscheck Accept Lite API
  description: The Accept Lite API from Crosscheck — 1 operation(s) for accept lite.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Accept Lite
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-accept-lite-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-acceptance-test-api
  name: Crosscheck acceptance test API
  description: The acceptance test API from Crosscheck — 2 operation(s) for acceptance test.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - acceptance test
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-acceptance-test-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-checks-api
  name: Crosscheck Checks API
  description: The Checks API from Crosscheck — 1 operation(s) for checks.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Checks
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-checks-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-draft-review-api
  name: Crosscheck draft review API
  description: The draft review API from Crosscheck — 1 operation(s) for draft review.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - draft review
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-draft-review-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-quote-api
  name: Crosscheck Quote API
  description: The Quote API from Crosscheck — 1 operation(s) for quote.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Quotes
  tags_raw:
  - Quote
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-quote-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-receipts-api
  name: Crosscheck Receipts API
  description: The Receipts API from Crosscheck — 1 operation(s) for receipts.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Receipts
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-receipts-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-sellercheck-api
  name: Crosscheck Sellercheck API
  description: The Sellercheck API from Crosscheck — 2 operation(s) for sellercheck.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Sellercheck
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-sellercheck-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-sellerwatch-api
  name: Crosscheck Sellerwatch API
  description: The Sellerwatch API from Crosscheck — 1 operation(s) for sellerwatch.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Sellerwatch
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-sellerwatch-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-skill-security-api
  name: Crosscheck skill security API
  description: The skill security API from Crosscheck — 2 operation(s) for skill security.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - skill security
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-skill-security-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-skillcheck-api
  name: Crosscheck Skillcheck API
  description: The Skillcheck API from Crosscheck — 2 operation(s) for skillcheck.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Skillcheck
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-skillcheck-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-skillcheck-lite-api
  name: Crosscheck Skillcheck Lite API
  description: The Skillcheck Lite API from Crosscheck — 1 operation(s) for skillcheck lite.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - Skillcheck Lite
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-skillcheck-lite-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-w-api
  name: Crosscheck W API
  description: The W API from Crosscheck — 1 operation(s) for w.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - W
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-w-api-openapi.yml
- aid: crosscheckapi-com:crosscheckapi-com-x402-seller-api
  name: Crosscheck x402 seller API
  description: The x402 seller API from Crosscheck — 2 operation(s) for x402 seller.
  humanURL: https://crosscheckapi.com/
  baseURL: https://crosscheckapi.com
  tags:
  - x402 seller
  properties:
  - type: OpenAPI
    url: openapi/crosscheckapi-com-x402-seller-api-openapi.yml
x-enrichment:
  date: '2026-11-04'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Crosscheck API — frequently asked questions

Does Crosscheck have an API?

Yes. APIs.io lists 14 APIs from Crosscheck, including Crosscheck Accept API, Crosscheck Accept Lite API and Crosscheck acceptance test API, and 11 more.

Is there an OpenAPI specification for the Crosscheck API?

Yes. APIs.io indexes 14 OpenAPI specifications for Crosscheck, each linked for download from this page.

How do I authenticate with the Crosscheck API?

Crosscheck uses bearer-token authentication (http · 1 scheme). The details are profiled on APIs.io as Crosscheckapi Com Authentication.

Is the Crosscheck API ready for AI agents?

Crosscheck has a Kin Score of 24.7 out of 100 (emerging) and an Agent Readiness score of 28.7 (agent-ready), scored by API Evangelist on 2026-11-06.

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