2O

When your AI agent needs verification, it calls 2O. Human experts respond with structured, quality‑scored results. Programmatically. Identity, reputation, payments, and accountability for autonomous AI systems. The trust layer agents need to transact, verify, and collaborate.

2O is listed with 2 APIs on the APIs.io network. Tagged areas include Artificial Intelligence, Verification, Human-in-the-Loop, Trust, and Agents.

The 2O catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

2O’s developer surface includes authentication, sandbox, documentation, API reference, getting-started guide, signup flow, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

42.9/100 developing ▬ flat Agent 27/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

AccessPaid

2 APIs 1 MCP Servers

Artificial Intelligence Verification Human-in-the-Loop Trust Agents

Kin Score

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

Composite quality — 42.9/100 · developing

Contract Quality 5.2 / 21

Developer Ergonomics 9.7 / 17

Access Clarity 11.2 / 17

Operational Transparency 2.3 / 11

Contract Governance 2.2 / 10

Discoverability 4.8 / 9

Regulatory Posture 3.4 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 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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It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/2oapi-xyz/"><img src="https://apis.io/badge/2oapi-xyz/card.svg" alt="2O on APIs.io — Kin Score by API Evangelist"></a>

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

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
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

7 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 24.7 — up to +18.8 composite points
Operational Transparency scores 21.1 — up to +10.3 composite points
Contract Governance scores 22.0 — up to +9.4 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/2oapi-xyz/apis.yml: open an issue on github.com/api-evangelist/2oapi-xyz 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 →

APIs 2

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

2O API

2O provides a REST API for AI agents to request human verification of claims, facts, and real-world information.

2O API

2O API as documented publicly: 15 operations. Contract generated from the documentation by API Evangelist (2026-10-31); not the provider's own document.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

2O MCP Server

Remote MCP server at www.2oapi.xyz requiring an API key.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

2Oapi Xyz Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

2Oapi Xyz Rate Limits

2 limits

RATE LIMITS

Semantic Vocabularies 1

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

2Oapi Xyz Context

15 classes · 38 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

2O API Rules

11 rules · 8 errors 1 warnings 2 info

SPECTRAL

JSON Schema 6

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

GetV1VerifyIdResponse

9 properties

JSON SCHEMA

GetV1VerifyIdResultResponse

9 properties

JSON SCHEMA

PostApiV1VerifyResponse

8 properties

JSON SCHEMA

PostV1EmpathizeRequest

6 properties

JSON SCHEMA

PostV1VerifyRequest

9 properties

JSON SCHEMA

PostV1WitnessRequest

6 properties

JSON SCHEMA

Security Posture 2

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

2Oapi Xyz Authentication

1 scheme

SECURITY

2Oapi Xyz Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

Sandbox

DeveloperPortal

GettingStarted

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

WellKnown

WellKnown

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

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)

aid: 2oapi-xyz
name: 2O
description: When your AI agent needs verification, it calls 2O. Human experts respond with structured, quality‑scored results.
  Programmatically. Identity, reputation, payments, and accountability for autonomous AI systems. The trust layer agents need
  to transact, verify, and collaborate.
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  probe_state: unreadable
  source:
  - plans
  - authentication
  - rate-limits
  - security
  generated: '2026-11-02'
  method: derived
image: https://www.2oapi.xyz/favicon.svg
url: https://artifacts.apis.io/2oapi-xyz/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:
- Artificial Intelligence
- Verification
- Human-in-the-Loop
- Trust
- Agents
tags_raw:
- AI
- Verification
- Human-in-the-loop
- Trust
- Agents
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: RateLimits
  url: rate-limits/2oapi-xyz-rate-limits.yml
- type: Plans
  url: plans/2oapi-xyz-plans-pricing.yml
- type: Spectral
  url: rules/2oapi-xyz-rules.yml
- type: JSONLD
  url: json-ld/2oapi-xyz-context.jsonld
- type: Vocabulary
  url: vocabulary/2oapi-xyz-vocabulary.yml
- type: DataModel
  url: data-model/2oapi-xyz-data-model.yml
- type: Authentication
  url: authentication/2oapi-xyz-authentication.yml
- type: Conformance
  url: conformance/2oapi-xyz-conformance.yml
- type: LLMsTxt
  url: llms/2oapi-xyz-llms.txt
- type: AgentCard
  url: a2a/2oapi-xyz-a2a.yml
- type: ToolCrosswalk
  url: mcp/2oapi-xyz-tool-crosswalk.yml
- type: MCPServer
  url: mcp/2oapi-xyz-mcp.yml
- type: WellKnown
  url: well-known/2oapi-xyz-well-known.yml
- type: Hosts
  url: hosts/2oapi-xyz-hosts.yml
- type: Vendors
  url: vendors/2oapi-xyz-vendors.yml
- type: Sandbox
  url: https://www.2oapi.xyz/console
- type: DomainSecurity
  url: security/2oapi-xyz-domain-security.yml
- type: Website
  url: https://2oapi.xyz/
- type: DeveloperPortal
  url: https://www.2oapi.xyz/
- type: Documentation
  url: https://www.2oapi.xyz/docs
- type: APIReference
  url: https://www.2oapi.xyz/docs
- type: GettingStarted
  url: https://www.2oapi.xyz/integrate
- type: SignUp
  url: https://www.2oapi.xyz/register
- type: TermsOfService
  url: https://www.2oapi.xyz/terms
- type: PrivacyPolicy
  url: https://www.2oapi.xyz/privacy
apis:
- name: 2O API
  description: 2O provides a REST API for AI agents to request human verification of claims, facts, and real-world information.
  humanURL: https://www.2oapi.xyz/docs
  baseURL: https://www.2oapi.xyz/api/v1
  aid: 2oapi-xyz:2o-api
- aid: 2oapi-xyz:2oapi-xyz-api
  name: 2O API
  description: '2O API as documented publicly: 15 operations. Contract generated from the documentation by API Evangelist
    (2026-10-31); not the

    provider''s own document.'
  humanURL: https://www.2oapi.xyz/api/mcp
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/2oapi-xyz-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/2oapi-xyz-post-v1-verify-request-schema.json
  - type: JSONSchema
    url: json-schema/2oapi-xyz-get-v1-verify-id-result-response-schema.json
  - type: JSONSchema
    url: json-schema/2oapi-xyz-post-api-v1-verify-response-schema.json
  - type: JSONSchema
    url: json-schema/2oapi-xyz-get-v1-verify-id-response-schema.json
  - type: JSONSchema
    url: json-schema/2oapi-xyz-post-v1-empathize-request-schema.json
  - type: JSONSchema
    url: json-schema/2oapi-xyz-post-v1-witness-request-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: The provider's public documentation describes the API but no OpenAPI, AsyncAPI, GraphQL, or other machine‑readable
    spec is published.
  evidence:
  - url: https://www.2oapi.xyz/docs
    status: 200
  checked: '2026-10-31'
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 32
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

2O API — frequently asked questions

Does 2O have an API?

Yes. APIs.io lists 2 APIs from 2O, including 2O API and 2O API.

Is there an OpenAPI specification for the 2O API?

Yes. APIs.io indexes 1 OpenAPI specification for 2O, each linked for download from this page.

How do I authenticate with the 2O API?

2O uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as 2Oapi Xyz Authentication.

How much does the 2O API cost?

APIs.io lists 3 pricing plans for 2O, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does 2O have an MCP server?

Yes. APIs.io lists 1 MCP server for 2O: Remote MCP server at www.2oapi.xyz requiring an API key.

Is the 2O API ready for AI agents?

2O has a Kin Score of 42.9 out of 100 (developing) and an Agent Readiness score of 27.0 (agent-aware), scored by API Evangelist on 2026-11-02.

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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.
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