Mart.dev

Mart.dev provides an unofficial, fast, and inexpensive API that delivers public LinkedIn data such as profiles, companies, posts, and jobs. It offers real‑time access without requiring LinkedIn credentials, delivering results in 1–2 seconds and supporting high request volumes. Free credits are available, and paid plans scale to millions of records.

Mart.dev is listed with 2 APIs on the APIs.io network, including Linked In API, and 1 more. Tagged areas include Company, Data, LinkedIn, and Unofficial.

The Mart.dev catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Mart.dev’s developer surface includes pricing, authentication, getting-started guide, documentation, signup flow, and 11 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

29.0/100 thin ▬ flat Agent 24/100 agent aware Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

2 APIs

Company Data LinkedIn Unofficial

Kin Score

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

Composite quality — 29.0/100 · thin

Contract Quality 3.9 / 21

Developer Ergonomics 5.7 / 17

Access Clarity 8.3 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 4.1 / 9

Regulatory Posture 2.8 / 15

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 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 4 / 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 does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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/mart-dev/"><img src="https://apis.io/badge/mart-dev/card.svg" alt="Mart.dev 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):

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 →
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 →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →

7 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 18.3 — up to +20.4 composite points Ask about this →
Developer Ergonomics scores 33.3 — up to +13.3 composite points Ask about this →
Operational Transparency scores 0.0 — up to +13.0 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/mart-dev/apis.yml: open an issue on github.com/api-evangelist/mart-dev 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 1

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.

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Mart API

Provides endpoints for public LinkedIn data such as profiles, companies, posts, and jobs.

Mart.dev Linked In API

The Linked In API from Mart.dev — 1 operation(s) for linked in.

Mart.dev API pricing

Prices published by Mart.dev, read 2026-09-28 from mart.dev/#pricing. A free plan or tier is listed.

Plan	Price
Free	Free
Launch	$50 one-time

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Mart.dev Plans Pricing

2 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Mart Dev Context

1 classes · 8 properties

JSON-LD

Spectral Rules 1

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

Mart.dev API Rules

12 rules · 10 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

GetV1LinkedinResponse

8 properties

JSON SCHEMA

Security Posture 2

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

Mart.dev Authentication

1 scheme

SECURITY

Mart.dev Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

Plans

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Hosts

Hosts

Source (apis.yml)

aid: mart-dev
name: Mart.dev
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  probe_state: unreadable
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://mart.dev/logo.png
description: Mart.dev provides an unofficial, fast, and inexpensive API that delivers public LinkedIn data such as profiles,
  companies, posts, and jobs. It offers real‑time access without requiring LinkedIn credentials, delivering results in 1–2
  seconds and supporting high request volumes. Free credits are available, and paid plans scale to millions of records.
url: https://raw.githubusercontent.com/api-evangelist/mart-dev/refs/heads/main/apis.yml
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-28 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-09-28'
modified: '2026-09-28'
tags:
- Company
- Data
- LinkedIn
- Unofficial
tags_raw:
- Company
- API
- Data
- LinkedIn
- Unofficial
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Pricing
  url: https://mart.dev/#pricing
- type: Plans
  url: plans/mart-dev-plans-pricing.yml
- type: Spectral
  url: rules/mart-dev-rules.yml
- type: JSONLD
  url: json-ld/mart-dev-context.jsonld
- type: Vocabulary
  url: vocabulary/mart-dev-vocabulary.yml
- type: DataModel
  url: data-model/mart-dev-data-model.yml
- type: Authentication
  url: authentication/mart-dev-authentication.yml
- type: Conformance
  url: conformance/mart-dev-conformance.yml
- type: Hosts
  url: hosts/mart-dev-hosts.yml
- type: GettingStarted
  url: https://mart.dev/docs/#quickstart
- type: DomainSecurity
  url: security/mart-dev-domain-security.yml
- type: Website
  url: https://mart.dev/
- type: Documentation
  url: https://mart.dev/docs/
- type: SignUp
  url: https://mart.dev/login/
- type: TermsOfService
  url: https://mart.dev/terms/
- type: PrivacyPolicy
  url: https://mart.dev/privacy/
apis:
- name: Mart API
  description: Provides endpoints for public LinkedIn data such as profiles, companies, posts, and jobs.
  humanURL: https://mart.dev/docs/
  baseURL: null
  aid: mart-dev:mart-api
- aid: mart-dev:mart-dev-linked-in-api
  name: Mart.dev Linked In API
  description: The Linked In API from Mart.dev — 1 operation(s) for linked in.
  humanURL: https://mart.dev/docs/
  tags:
  - LinkedIn
  tags_raw:
  - Linked In
  properties:
  - type: OpenAPI
    url: openapi/mart-dev-linked-in-api-openapi.yml
  - type: JSONSchema
    url: json-schema/mart-dev-get-v1-linkedin-response-schema.json
x-submission-notes: Markets itself as 'the world's fastest and cheapest LinkedIn API' -- an UNOFFICIAL third-party LinkedIn
  data API (not LinkedIn's). Profile it as Mart.dev's own API; never attribute it to LinkedIn.
x-submission-probe: '2026-09-28: root 200, invented 404, docs 200'
x-coverage:
  state: unreadable
  reason: js-rendered-docs
  detail: Documentation is served as rendered HTML pages without a machine‑readable OpenAPI or other contract.
  evidence:
  - url: https://mart.dev/docs/
    status: 200
  checked: '2026-09-28'
x-enrichment:
  date: '2026-09-28'
  status: enriched
  artifacts_added: 15
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Mart.dev API — frequently asked questions

Does Mart.dev have an API?

Yes. APIs.io lists 2 APIs from Mart.dev, including Mart API and Mart.dev Linked In API.

Is there an OpenAPI specification for the Mart.dev API?

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

How do I authenticate with the Mart.dev API?

Mart.dev uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Mart.dev Authentication.

How much does the Mart.dev API cost?

Mart.dev publishes its prices; its Launch plan is $50 one-time as of 2026-09-28. APIs.io lists 2 pricing plans for Mart.dev, with each plan's price, limits and inclusions under Pricing on this page.

Is the Mart.dev API ready for AI agents?

Mart.dev has a Kin Score of 29.0 out of 100 (thin) and an Agent Readiness score of 23.8 (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/mart-dev"

All providers

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

Every operation they expose

curl "https://apis.io/api/v1/providers/mart-dev/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/mart-dev/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.