409A Cost

409A Cost provides a comprehensive guide and calculator for US startup 409A valuation costs. The site offers detailed guides on valuation requirements, when to refresh, example reports, and a data table of published prices from multiple providers. It aims to help startups budget for mandatory 409A valuations, understand regulatory requirements, and access transparent pricing information.

409A Cost publishes 3 API contracts indexed on the APIs.io network: Calculator API, Enquiry API, and MCP API. Tagged areas include Company, Valuation, Startups, Finance, and Calculator.

The 409A Cost catalog on APIs.io includes 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

28.7/100 thin ▬ flat Agent 27/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract 1 MCP Servers 2 Agent Skills

Company Valuation Startups Finance Calculator

Kin Score

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

Composite quality — 28.7/100 · thin

Contract Quality 10.4 / 21

Developer Ergonomics 0.3 / 17

Access Clarity 3.6 / 17

Operational Transparency 1.2 / 11

Contract Governance 2.2 / 10

Discoverability 5.5 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 27/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 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):

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)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
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)

6 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 1.8 — up to +19.6 composite points
Access Clarity scores 21.1 — up to +15.8 composite points
Contract Quality scores 48.8 — up to +12.8 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/409acost-com/apis.yml: open an issue on github.com/api-evangelist/409acost-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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 3

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

409A Cost Calculator API

calculator

409A Cost Enquiry API

enquiry

409A Cost MCP API

The mcp API from 409A Cost — 1 operation(s) for mcp.

MCP Servers 1

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

409A Cost MCP Server

Remote MCP server at 409acost.com.

MCP SERVER

Agent Skills 2

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

409acost-com-enquiry-process

AGENT SKILL

409acost-com-mcp-interaction

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

409A Cost API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

Security Posture 3

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

409Acost Com Authentication

1 scheme

SECURITY

409Acost Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

409Acost Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

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

409Acost Com Agentic Access

7 operations · 6 acting

AGENTIC

Resources

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

ErrorCatalog

Conformance

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 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: 409acost-com
name: 409A Cost
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-02'
  method: derived
image: https://409acost.com/og.png
description: 409A Cost provides a comprehensive guide and calculator for US startup 409A valuation costs. The site offers
  detailed guides on valuation requirements, when to refresh, example reports, and a data table of published prices from multiple
  providers. It aims to help startups budget for mandatory 409A valuations, understand regulatory requirements, and access
  transparent pricing information.
url: https://artifacts.apis.io/409acost-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)
specificationVersion: '0.20'
created: '2026-10-31'
modified: '2026-10-31'
tags:
- Company
- Valuation
- Startups
- Finance
- Calculator
tags_raw:
- Company
- Valuation
- Startup
- Finance
- Calculator
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/409acost-com-agentic-access.yml
- type: Spectral
  url: rules/409acost-com-rules.yml
- type: Vocabulary
  url: vocabulary/409acost-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Security
  url: https://409acost.com/terms
- type: ErrorCatalog
  url: errors/409acost-com-problem-types.yml
- type: Conformance
  url: conformance/409acost-com-conformance.yml
- type: LLMsTxt
  url: llms/409acost-com-llms.txt
- type: MCPServer
  url: mcp/409acost-com-mcp.yml
- type: SecurityTxt
  url: well-known/409acost-com-security.txt
- type: WellKnown
  url: well-known/409acost-com-well-known.yml
- type: Hosts
  url: hosts/409acost-com-hosts.yml
- type: Vendors
  url: vendors/409acost-com-vendors.yml
- type: VulnerabilityDisclosure
  url: security/409acost-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/409acost-com-domain-security.yml
- type: Website
  url: https://409acost.com/
- type: TermsOfService
  url: https://409acost.com/terms/
- type: PrivacyPolicy
  url: https://409acost.com/privacy/
apis:
- aid: 409acost-com:409acost-com-calculator-api
  name: 409A Cost Calculator API
  description: calculator
  humanURL: https://409acost.com/
  baseURL: https://409acost.com
  tags:
  - Calculator
  tags_raw:
  - calculator
  properties:
  - type: OpenAPI
    url: openapi/409acost-com-calculator-api-openapi.yml
- aid: 409acost-com:409acost-com-enquiry-api
  name: 409A Cost Enquiry API
  description: enquiry
  humanURL: https://409acost.com/
  baseURL: https://409acost.com
  tags:
  - enquiry
  properties:
  - type: OpenAPI
    url: openapi/409acost-com-enquiry-api-openapi.yml
- aid: 409acost-com:409acost-com-mcp-api
  name: 409A Cost MCP API
  description: The mcp API from 409A Cost — 1 operation(s) for mcp.
  humanURL: https://409acost.com/
  baseURL: https://409acost.com
  tags:
  - MCP
  tags_raw:
  - mcp
  properties:
  - type: OpenAPI
    url: openapi/409acost-com-mcp-api-openapi.yml
x-enrichment:
  date: '2026-10-31'
  status: enriched
  artifacts_added: 23
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

409A Cost API — frequently asked questions

Does 409A Cost have an API?

Yes. APIs.io lists 3 APIs from 409A Cost, including 409A Cost Calculator API, 409A Cost Enquiry API and 409A Cost MCP API.

Is there an OpenAPI specification for the 409A Cost API?

Yes. APIs.io indexes 3 OpenAPI specifications for 409A Cost, each linked for download from this page.

How do I authenticate with the 409A Cost API?

409A Cost uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as 409Acost Com Authentication.

Does 409A Cost have an MCP server?

Yes. APIs.io lists 1 MCP server for 409A Cost: Remote MCP server at 409acost.com.

Is the 409A Cost API ready for AI agents?

409A Cost has a Kin Score of 28.7 out of 100 (thin) and an Agent Readiness score of 26.8 (agent-aware), scored by API Evangelist on 2026-11-02.

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Tools for providers

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get_provider_artifactsEvery artifact this provider publishes, grouped by type.
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.
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resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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