Four-Leaf

Four-Leaf is an AI-powered job search assistant that helps users prepare for interviews, tailor resumes, write cover letters, and negotiate salaries. It offers voice mock interviews, resume optimization, and career coaching tools, with a free 3‑day trial and a $20/month subscription for full access.

Four-Leaf is profiled on the APIs.io network. Tagged areas include AI job search, Resume Builder, mock interview, cover letter generator, and LinkedIn optimizer.

Four-Leaf’s developer surface includes changelog, pricing, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

23.4/100 emerging Agent 19/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumFree trial

0 APIs

AI job searchResume Buildermock interviewcover letter generatorLinkedIn optimizerapplication tracker

Kin Score

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

Composite quality — 23.4/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 0.4 / 17

Access Clarity 10.5 / 17

Operational Transparency 2.6 / 11

Contract Governance 0.0 / 10

Discoverability 5.0 / 9

Regulatory Posture 3.8 / 15

Agent readiness — 19/100 · agent aware

Machine-Readable Contract 0 / 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/.

Show this score on your site.

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

<a href="https://apis.io/providers/four-leaf-ai/"><img src="https://apis.io/badge/four-leaf-ai/card.svg" alt="Four-Leaf on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

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

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
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 →

9 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 2.4 — up to +19.5 composite points Ask about this →
Contract Governance scores 0.0 — up to +12.0 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/four-leaf-ai/apis.yml: open an issue on github.com/api-evangelist/four-leaf-ai 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)

Four-Leaf API pricing

Prices published by Four-Leaf, read 2026-11-08 from four-leaf.ai/pricing.

Plan	Price
Free trial	$0
5 Day Pass	$5
Pro	$20

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Four-Leaf Plans Pricing

3 plans

PLANS

Security Posture 2

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

Four-Leaf Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Four-Leaf Vulnerability Disclosure

security.txt · contact published

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Access & Security 4

Authentication, authorization, and security posture

Security

Security

SecurityTxt

SecurityTxt

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

ChangeLog

ChangeLog

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: four-leaf-ai
name: Four-Leaf
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: true
  try_now: false
  public: false
  label: Freemium (free trial)
  confidence: low
  probe_state: unreadable
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://four-leaf.ai/opengraph-image?9898d172f4b5681c
description: Four-Leaf is an AI-powered job search assistant that helps users prepare for interviews, tailor resumes, write
  cover letters, and negotiate salaries. It offers voice mock interviews, resume optimization, and career coaching tools,
  with a free 3‑day trial and a $20/month subscription for full access.
url: https://artifacts.apis.io/four-leaf-ai/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:
- AI job search
- Resume Builder
- mock interview
- cover letter generator
- LinkedIn optimizer
- application tracker
tags_raw:
- AI job search
- resume builder
- mock interview
- cover letter generator
- LinkedIn optimizer
- application tracker
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/four-leaf-ai-plans-pricing.yml
- type: ChangeLog
  url: changelog/four-leaf-ai-changelog.yml
- type: Security
  url: security/four-leaf-ai-vulnerability-disclosure.yml
- type: LLMsTxt
  url: llms/four-leaf-ai-llms.txt
- type: SecurityTxt
  url: well-known/four-leaf-ai-security.txt
- type: WellKnown
  url: well-known/four-leaf-ai-well-known.yml
- type: Hosts
  url: hosts/four-leaf-ai-hosts.yml
- type: Vendors
  url: vendors/four-leaf-ai-vendors.yml
- type: TermsOfService
  url: https://four-leaf.ai/terms
- type: PrivacyPolicy
  url: https://four-leaf.ai/privacy
- type: Pricing
  url: https://four-leaf.ai/pricing
- type: Login
  url: https://four-leaf.ai/login
- type: ChangeLog
  url: https://four-leaf.ai/changelog
- type: Blog
  url: https://four-leaf.ai/blog
- type: VulnerabilityDisclosure
  url: security/four-leaf-ai-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/four-leaf-ai-domain-security.yml
- type: Website
  url: https://four-leaf.ai/
apis: []
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: No OpenAPI, AsyncAPI, GraphQL, gRPC, or WSDL contracts were found despite probing known hosts and documentation
    pages.
  evidence:
  - url: https://four-leaf.ai/docs
    status: 404
  checked: '2026-11-08'
x-enrichment:
  date: '2026-11-08'
  status: enriched
  artifacts_added: 15
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Four-Leaf API — frequently asked questions

How much does the Four-Leaf API cost?

Four-Leaf publishes its prices; its Free trial plan is $0 as of 2026-11-08. APIs.io lists 3 pricing plans for Four-Leaf, with each plan's price, limits and inclusions under Pricing on this page.

Is the Four-Leaf API ready for AI agents?

Four-Leaf has a Kin Score of 23.4 out of 100 (emerging) and an Agent Readiness score of 18.7 (agent-aware), scored by API Evangelist on 2026-11-13.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
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.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/four-leaf-ai"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/four-leaf-ai/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/four-leaf-ai/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.