Marketstack website screenshot

Marketstack

Marketstack is a real-time, intraday, and historical stock market data API from APILayer, delivering JSON data for tickers across 70+ global stock exchanges. The REST API covers end-of-day and intraday prices, real-time stock prices, splits, dividends, commodities, company ratings, market indexes, bonds, ETF holdings, currencies, timezones, and SEC EDGAR company filings and facts, all authenticated with a simple access_key query parameter.

Marketstack publishes 1 API on the APIs.io network: API v2. Tagged areas include Finance, Stock Market, Market Data, End-of-Day Data, and Intraday Data.

Marketstack’s developer surface includes documentation, API reference, getting-started guide, support, pricing, signup flow, engineering blog, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
57.1/100 strong ▬ flat Agent 42/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessFreemiumFree trial
1 APIs 1 MCP Servers
FinanceStock MarketMarket DataEnd-of-Day DataIntraday DataCommoditiesBondsETFsSEC EDGARDividends

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 57.1/100 · strong
Contract Quality 9.7 / 21
Developer Ergonomics 9.8 / 17
Access Clarity 13.0 / 17
Operational Transparency 5.2 / 11
Contract Governance 1.7 / 10
Discoverability 7.1 / 9
Regulatory Posture 7.8 / 15
Agent readiness — 42/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 6 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 4 / 4
Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data 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.
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/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/marketstack: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 1

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

Marketstack API v2

Real-time, intraday and historical market data API with 45 endpoints spanning end-of-day bars, intraday bars, real-time stock prices, commodities, company ratings, splits, divid...

Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Marketstack API v2

OPEN COLLECTION

MCP Servers 1

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

marketstack (community)

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Marketstack Plans

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Marketstack Rate Limits

5 limits

RATE LIMITS

Security Posture 2

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

Marketstack Authentication

apiKey · 1 scheme

SECURITY

Marketstack Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 LLMsTxt
LLMsTxt
 AgentSkill
AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 DataModel
DataModel

Build 2

SDKs, sample code, and the tooling you integrate with

Postman
Postman
 Packages
Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

PublicAPIsListing
PublicAPIsListing
 Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: marketstack
accessModel:
  pricing: freemium
  onboarding: self-service
  trial: true
  try_now: false
  public: true
  label: Freemium
  confidence: high
  source:
  - https://marketstack.com/pricing
  - https://marketstack.com/signup/free
  generated: '2026-07-22'
  method: searched
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/marketstack.png
name: Marketstack
description: Marketstack is a real-time, intraday, and historical stock market data API from APILayer, delivering JSON data
  for tickers across 70+ global stock exchanges. The REST API covers end-of-day and intraday prices, real-time stock prices,
  splits, dividends, commodities, company ratings, market indexes, bonds, ETF holdings, currencies, timezones, and SEC EDGAR
  company filings and facts, all authenticated with a simple access_key query parameter.
url: https://marketstack.com
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-07-22'
x-source: public-apis/public-apis
x-category: Finance
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
tags:
- Finance
- Stock Market
- Market Data
- End-of-Day Data
- Intraday Data
- Commodities
- Bonds
- ETFs
- SEC EDGAR
- Dividends
apis:
- name: Marketstack API v2
  description: Real-time, intraday and historical market data API with 45 endpoints spanning end-of-day bars, intraday bars,
    real-time stock prices, commodities, company ratings, splits, dividends, tickers, indexes, exchanges, currencies, timezones,
    bonds, ETF holdings, and SEC EDGAR filings data.
  humanURL: https://marketstack.com
  baseURL: https://api.marketstack.com/v2
  tags:
  - Finance
  - Stock Market
  - Market Data
  properties:
  - type: OpenAPI
    url: openapi/marketstack-v2-openapi.json
  - type: Documentation
    url: https://docs.apilayer.com/marketstack/docs/api-documentation
  - type: APIReference
    url: https://marketstack.com/documentation_v2
  - type: ToolCrosswalk
    url: mcp/marketstack-tool-crosswalk.yml
common:
- type: Website
  url: https://marketstack.com
- type: DeveloperPortal
  url: https://docs.apilayer.com/marketstack
- type: Documentation
  url: https://docs.apilayer.com/marketstack/docs/api-documentation
- type: APIReference
  url: https://marketstack.com/documentation_v2
- type: GettingStarted
  url: https://marketstack.com/quickstart
- type: Support
  url: https://marketstack.com/contact
- type: Pricing
  url: https://marketstack.com/pricing
- type: SignUp
  url: https://marketstack.com/signup/free
- type: Login
  url: https://marketstack.com/login
- type: TermsOfService
  url: https://marketstack.com/terms
- type: PrivacyPolicy
  url: https://marketstack.com/privacy
- type: StatusPage
  url: https://status.marketstack.com
- type: Postman
  url: https://www.postman.com/apilayer
- type: Blog
  url: https://blog.apilayer.com/feed/
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: DomainSecurity
  url: security/marketstack-domain-security.yml
- type: Packages
  url: packages/marketstack-packages.yml
- type: MCPServer
  url: mcp/marketstack-mcp.yml
- type: LLMsTxt
  url: llms/marketstack-llms.txt
- type: Overlay
  url: overlays/marketstack-v2-overlay.yaml
- type: Conformance
  url: conformance/marketstack-conformance.yml
- type: ErrorCatalog
  url: errors/marketstack-problem-types.yml
- type: Lifecycle
  url: lifecycle/marketstack-lifecycle.yml
- type: Authentication
  url: authentication/marketstack-authentication.yml
- type: Conventions
  url: conventions/marketstack-conventions.yml
- type: DataModel
  url: data-model/marketstack-data-model.yml
- type: RateLimits
  url: rate-limits/marketstack-rate-limits.yml
- type: Plans
  url: plans/marketstack-plans.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com