Onthos

Onthos provides intelligence products and ontology infrastructure for financial markets. It builds a dynamic ontology layer that maps global companies, industry classifications, thematic factor models, and concept-to-universe frameworks. Their solutions enable clients such as asset managers, ETFs, investment banks, hedge funds, and wealth platforms to transform raw information into connected knowledge for applications and AI agents. Onthos also offers a platform for building custom ontologies and delivering market insights through APIs and data services.

Onthos is profiled on the APIs.io network. Tagged areas include Company, Finance, Ontology, Data, and Intelligence.

Onthos’ developer surface includes engineering blog and 10 more developer resources.

🌐 Visit website📡 Profile data on GitHub
11.6/100 emerging Agent 3/100 human only Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →
0 APIs
CompanyFinanceOntologyDataIntelligence

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0
Composite quality — 11.6/100 · emerging
Contract Quality 0.0 / 21
Developer Ergonomics 0.4 / 17
Access Clarity 3.6 / 17
Operational Transparency 1.2 / 11
Contract Governance 0.0 / 10
Discoverability 4.1 / 9
Regulatory Posture 2.9 / 15
Agent readiness — 3/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 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
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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<a href="https://apis.io/providers/onthos/"><img src="https://apis.io/badge/onthos/card.svg" alt="Onthos on APIs.io — Kin Score by API Evangelist"></a>
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Agent readiness — checks not met, largest first (exact, from this profile):
  • Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
  • 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
  • Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
12 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/onthos/apis.yml: open an issue on github.com/api-evangelist/onthos 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 →

Security Posture 2

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

Onthos Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Onthos Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown

Access & Security 4

Authentication, authorization, and security posture

Security
Security
 SecurityTxt
SecurityTxt
 VulnerabilityDisclosure
VulnerabilityDisclosure
 DomainSecurity
DomainSecurity

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Hosts
Hosts
 Vendors
Vendors

Source (apis.yml)

apis.yml Raw ↑ 
aid: onthos
name: Onthos
image: https://www.onthos.com/preview.png
description: Onthos provides intelligence products and ontology infrastructure for financial markets. It builds a dynamic
  ontology layer that maps global companies, industry classifications, thematic factor models, and concept-to-universe frameworks.
  Their solutions enable clients such as asset managers, ETFs, investment banks, hedge funds, and wealth platforms to transform
  raw information into connected knowledge for applications and AI agents. Onthos also offers a platform for building custom
  ontologies and delivering market insights through APIs and data services.
url: https://artifacts.apis.io/onthos/apis.yml
x-type: company
x-source: harvest:vc-portfolio
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- Company
- Finance
- Ontology
- Data
- Intelligence
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Security
  url: https://www.onthos.com/security-policy
- type: SecurityTxt
  url: well-known/onthos-security.txt
- type: WellKnown
  url: well-known/onthos-well-known.yml
- type: Hosts
  url: hosts/onthos-hosts.yml
- type: Vendors
  url: vendors/onthos-vendors.yml
- type: VulnerabilityDisclosure
  url: security/onthos-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/onthos-domain-security.yml
- type: Website
  url: https://www.onthos.com/
- type: Blog
  url: https://www.onthos.com/blog/
- type: TermsOfService
  url: https://www.onthos.com/terms-of-service/
- type: PrivacyPolicy
  url: https://www.onthos.com/privacy-policy/
apis: []
x-backed-by:
- unusual-ventures
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI or other machine‑readable contract was found on the provider’s API host.
  evidence:
  - url: https://api.onthos.com/openapi.json
    status: 0
  checked: '2026-10-29'
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

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