firenum

firenum LLC provides a free retirement planner and FIRE calculators, built with input from a CFP® professional and fee‑only financial advisors. The tool helps users estimate retirement dates, assess whether savings will last, and explore scenarios with US taxes, Social Security, and market assumptions dating back to 1872. It offers a no‑sign‑up, ad‑free experience, focusing on transparent, user‑friendly financial planning for individuals and couples.

firenum publishes 1 API contract indexed on the APIs.io network: Fire Plan API. Tagged areas include Finance, Retirement, Calculator, Free, and Personal Finance.

The firenum catalog on APIs.io includes 1 Spectral governance ruleset.

firenum’s developer surface includes documentation, engineering blog, API reference, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

32.1/100 thin Agent 32/100 agent ready Heartbeat 100/100 alive Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract

Finance Retirement Calculator Free Personal Finance

Kin Score

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

Composite quality — 32.1/100 · thin

Contract Quality 10.0 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 5.8 / 17

Operational Transparency 0.0 / 11

Contract Governance 1.9 / 10

Discoverability 6.7 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 32/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 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 0 / 5

Well-Known Catalog 4 / 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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Agent readiness — checks not met, largest first (exact, from this profile):

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) 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 →
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 →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
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) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

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 19.0 — up to +16.2 composite points Ask about this →
Contract Quality scores 47.1 — up to +13.2 composite points Ask about this →
Access Clarity scores 34.0 — up to +13.2 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.

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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/firenum-com/apis.yml: open an issue on github.com/api-evangelist/firenum-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 3

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.

Agent2Agent

measured — observed by APIs.io (conformant)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OpenAPI

measured — observed by APIs.io (published)

APIs 1

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

firenum Fire Plan API

The Fire Plan API from firenum — 1 operation(s) for fire plan.

firenum API pricing

Prices published by firenum, read 2026-11-08 from firenum.com/blog/fire-plan-with-ai-assistants.

Plan	Price
Planning consult	$500
Complete financial plan	$3,000

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

firenum Plans Pricing

2 plans

PLANS

Spectral Rules 1

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

firenum API Rules

30 rules · 28 error-severity 1 warn-severity 1 info-severity

SPECTRAL

Security Posture 1

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

firenum Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

firenum Agentic Access

1 operation · 1 acting

1 operations · 1 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Spectral

Spectral

ErrorCatalog

ErrorCatalog

Conformance

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

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

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: firenum-com
name: firenum
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://firenum.com/og-image.png
description: firenum LLC provides a free retirement planner and FIRE calculators, built with input from a CFP® professional
  and fee‑only financial advisors. The tool helps users estimate retirement dates, assess whether savings will last, and explore
  scenarios with US taxes, Social Security, and market assumptions dating back to 1872. It offers a no‑sign‑up, ad‑free experience,
  focusing on transparent, user‑friendly financial planning for individuals and couples.
url: https://artifacts.apis.io/firenum-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-08 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-08'
modified: '2026-11-08'
tags:
- Finance
- Retirement
- Calculator
- Free
- Personal Finance
tags_raw:
- Finance
- Retirement
- Calculator
- Free
- PersonalFinance
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/firenum-com-agentic-access.yml
- type: Plans
  url: plans/firenum-com-plans-pricing.yml
- type: Spectral
  url: rules/firenum-com-rules.yml
- type: ErrorCatalog
  url: errors/firenum-com-problem-types.yml
- type: Conformance
  url: conformance/firenum-com-conformance.yml
- type: LLMsTxt
  url: llms/firenum-com-llms.txt
- type: AgentCard
  url: a2a/firenum-com-a2a.yml
- type: WellKnown
  url: well-known/firenum-com-well-known.yml
- type: Hosts
  url: hosts/firenum-com-hosts.yml
- type: Vendors
  url: vendors/firenum-com-vendors.yml
- type: TermsOfService
  url: https://firenum.com/terms
- type: PrivacyPolicy
  url: https://firenum.com/privacy
- type: Newsroom
  url: https://firenum.com/press
- type: Documentation
  url: https://firenum.com/guides
- type: Blog
  url: https://firenum.com/blog
- type: APIReference
  url: https://firenum.com/developers
- type: DomainSecurity
  url: security/firenum-com-domain-security.yml
- type: Website
  url: https://firenum.com/
apis:
- aid: firenum-com:firenum-com-fire-plan-api
  name: firenum Fire Plan API
  description: The Fire Plan API from firenum — 1 operation(s) for fire plan.
  humanURL: https://firenum.com/developers
  baseURL: https://firenum.com
  tags:
  - Fire Plan
  properties:
  - type: OpenAPI
    url: openapi/firenum-com-fire-plan-api-openapi.yml
x-enrichment:
  date: '2026-11-08'
  status: enriched
  artifacts_added: 21
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

firenum API — frequently asked questions

Does firenum have an API?

Yes. APIs.io lists 1 API from firenum, including firenum Fire Plan API.

Is there an OpenAPI specification for the firenum API?

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

How much does the firenum API cost?

firenum publishes its prices; its Planning consult plan is $500 as of 2026-11-08. APIs.io lists 2 pricing plans for firenum, with each plan's price, limits and inclusions under Pricing on this page.

Is the firenum API ready for AI agents?

firenum has a Kin Score of 32.1 out of 100 (thin) and an Agent Readiness score of 32.2 (agent-ready), scored by API Evangelist on 2026-11-13.

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