Fair Value Calculator

Fair Value Calculator provides free stock valuation tools, offering fair value estimates for over 40,000 stocks using 26 models and a Quality Score based on 37 factors. Established in 2016, it aims to deliver evidence‑based research for self‑directed investors, emphasizing transparency, independence, and a non‑advisory stance.

Fair Value Calculator is listed with 1 API on the APIs.io network. Tagged areas include Finance, Valuation, Stocks, Calculator, and Investment.

The Fair Value Calculator catalog on APIs.io includes 1 Spectral governance ruleset.

Fair Value Calculator’s developer surface includes engineering blog, documentation, API reference, getting-started guide, pricing, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

20.3/100 emerging Agent 32/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

1 API

Finance Valuation Stocks Calculator Investment

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 20.3/100 · emerging

Contract Quality 2.0 / 21

Developer Ergonomics 5.3 / 17

Access Clarity 2.5 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.2 / 9

Regulatory Posture 2.4 / 15

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 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 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 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 Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
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) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

8 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 9.4 — up to +22.7 composite points Ask about this →
Access Clarity scores 14.9 — up to +17.0 composite points Ask about this →
Developer Ergonomics scores 31.0 — up to +13.8 composite points Ask about this →

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.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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/fairvalue-calculator-com/apis.yml: open an issue on github.com/api-evangelist/fairvalue-calculator-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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

Fair Value Calculator API

Fair Value Calculator API as documented publicly: 1 operations. Contract generated from the documentation by API Evangelist (2026-11-07); not the provider's own document.

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Fair Value Calculator API Rules

19 rules · 17 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 1

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

Fair Value Calculator Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

Vocabulary

Vocabulary

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Leadership

Leadership

Source (apis.yml)

aid: fairvalue-calculator-com
name: Fair Value Calculator
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  probe_state: gated
  source:
  - security
  generated: '2026-11-13'
  method: derived
image: https://www.fairvalue-calculator.com/assets/og-card.png
description: Fair Value Calculator provides free stock valuation tools, offering fair value estimates for over 40,000 stocks
  using 26 models and a Quality Score based on 37 factors. Established in 2016, it aims to deliver evidence‑based research
  for self‑directed investors, emphasizing transparency, independence, and a non‑advisory stance.
url: https://artifacts.apis.io/fairvalue-calculator-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-07 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-07'
modified: '2026-11-07'
tags:
- Finance
- Valuation
- Stocks
- Calculator
- Investment
tags_raw:
- Finance
- Valuation
- Stock
- Calculator
- Investment
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Spectral
  url: rules/fairvalue-calculator-com-rules.yml
- type: Vocabulary
  url: vocabulary/fairvalue-calculator-com-vocabulary.yml
- type: Conformance
  url: conformance/fairvalue-calculator-com-conformance.yml
- type: LLMsTxt
  url: llms/fairvalue-calculator-com-llms.txt
- type: WellKnown
  url: well-known/fairvalue-calculator-com-well-known.yml
- type: Hosts
  url: hosts/fairvalue-calculator-com-hosts.yml
- type: Vendors
  url: vendors/fairvalue-calculator-com-vendors.yml
- type: TrustCenter
  url: https://www.fairvalue-calculator.com/trust
- type: Newsroom
  url: https://www.fairvalue-calculator.com/press
- type: Leadership
  url: https://www.fairvalue-calculator.com/stock/TEAM
- type: Blog
  url: https://www.fairvalue-calculator.com/en/blog/
- type: DomainSecurity
  url: security/fairvalue-calculator-com-domain-security.yml
- type: Website
  url: https://fairvalue-calculator.com/
- type: Documentation
  url: https://www.fairvalue-calculator.com/developers
- type: APIReference
  url: https://www.fairvalue-calculator.com/developers
- type: GettingStarted
  url: https://www.fairvalue-calculator.com/about
- type: Pricing
  url: https://www.fairvalue-calculator.com/pro/
apis:
- aid: fairvalue-calculator-com:fairvalue-calculator-com-api
  name: Fair Value Calculator API
  description: 'Fair Value Calculator API as documented publicly: 1 operations. Contract generated from the documentation
    by API Evangelist (2026-11-07); not the provider''s own document.'
  humanURL: https://www.fairvalue-calculator.com/developers
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/fairvalue-calculator-com-openapi-generated.yml
    x-provenance: generated
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-11-07'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://fairvalue-calculator.com/mcp
    status: 401
  - url: https://www.fairvalue-calculator.com/mcp
    status: 401
  - url: https://fairvalue-calculator.com/
    status: 200
x-enrichment:
  date: '2026-11-07'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Fair Value Calculator API — frequently asked questions

Does Fair Value Calculator have an API?

Yes. APIs.io lists 1 API from Fair Value Calculator, including Fair Value Calculator API.

Is there an OpenAPI specification for the Fair Value Calculator API?

Yes. APIs.io indexes 1 OpenAPI specification for Fair Value Calculator, each linked for download from this page.

Is the Fair Value Calculator API ready for AI agents?

Fair Value Calculator has a Kin Score of 20.3 out of 100 (emerging) and an Agent Readiness score of 31.7 (agent-ready), scored by API Evangelist on 2026-11-13.

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