402 Oracle

402 Oracle provides independent, cryptographically signed attestations that AI agents can cite before taking actions. It offers verification of business legitimacy, domain authenticity, price accuracy, and URL liveliness, with pay-per-call pricing in USDC on multiple blockchains (Base, Polygon, Arbitrum). The service delivers verifiable trust scores and evidence URLs, supporting bulk verification for vendor screening and fraud prevention, all without requiring accounts or API keys.

402 Oracle publishes 1 API contract indexed on the APIs.io network: Verify API. Tagged areas include Verification, Blockchain, Artificial Intelligence, Trust, and Finance.

The 402 Oracle catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

23.2/100 emerging ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract

Verification Blockchain Artificial Intelligence Trust Finance

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 23.2/100 · emerging

Contract Quality 11.7 / 21

Developer Ergonomics 1.1 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.3 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 28/100 · 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 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 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/.

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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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 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 6.4 — up to +18.7 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/402oracle-com/apis.yml: open an issue on github.com/api-evangelist/402oracle-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 1

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

402 Oracle Verify API

The Verify API from 402 Oracle — 5 operation(s) for verify.

Semantic Vocabularies 1

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

402Oracle Com Context

3 classes · 7 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

402 Oracle API Rules

15 rules · 13 errors 1 warnings 1 info

SPECTRAL

JSON Schema 1

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

SignedAttestation

2 properties

JSON SCHEMA

Security Posture 1

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

402Oracle Com Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

402Oracle Com Agentic Access

10 operations · 10 acting

AGENTIC

Resources

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

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 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: 402oracle-com
name: 402 Oracle
description: 402 Oracle provides independent, cryptographically signed attestations that AI agents can cite before taking
  actions. It offers verification of business legitimacy, domain authenticity, price accuracy, and URL liveliness, with pay-per-call
  pricing in USDC on multiple blockchains (Base, Polygon, Arbitrum). The service delivers verifiable trust scores and evidence
  URLs, supporting bulk verification for vendor screening and fraud prevention, all without requiring accounts or API keys.
url: https://artifacts.apis.io/402oracle-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)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Verification
- Blockchain
- Artificial Intelligence
- Trust
- Finance
tags_raw:
- Verification
- Blockchain
- AI
- Trust
- Finance
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/402oracle-com-agentic-access.yml
- type: Spectral
  url: rules/402oracle-com-rules.yml
- type: JSONLD
  url: json-ld/402oracle-com-context.jsonld
- type: Vocabulary
  url: vocabulary/402oracle-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/402oracle-com-data-model.yml
- type: ErrorCatalog
  url: errors/402oracle-com-problem-types.yml
- type: Conformance
  url: conformance/402oracle-com-conformance.yml
- type: LLMsTxt
  url: llms/402oracle-com-llms.txt
- type: Hosts
  url: hosts/402oracle-com-hosts.yml
- type: Vendors
  url: vendors/402oracle-com-vendors.yml
- type: DomainSecurity
  url: security/402oracle-com-domain-security.yml
- type: Website
  url: https://402oracle.com/
apis:
- aid: 402oracle-com:402oracle-com-verify-api
  name: 402 Oracle Verify API
  description: The Verify API from 402 Oracle — 5 operation(s) for verify.
  humanURL: https://402oracle.com/
  baseURL: https://402oracle.com
  tags:
  - Verify
  properties:
  - type: OpenAPI
    url: openapi/402oracle-com-verify-api-openapi.yml
  - type: JSONSchema
    url: json-schema/402oracle-com-signed-attestation-schema.json
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 20
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

402 Oracle API — frequently asked questions

Does 402 Oracle have an API?

Yes. APIs.io lists 1 API from 402 Oracle, including 402 Oracle Verify API.

Is there an OpenAPI specification for the 402 Oracle API?

Yes. APIs.io indexes 1 OpenAPI specification for 402 Oracle, each linked for download from this page.

Is the 402 Oracle API ready for AI agents?

402 Oracle has a Kin Score of 23.2 out of 100 (emerging) and an Agent Readiness score of 27.8 (agent-aware), scored by API Evangelist on 2026-11-02.

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