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
49.9/100 developing ▬ flat Agent 44/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6
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 2026-07-28 · rubric v0.6
Composite quality — 49.9/100 · developing
Contract Quality 8.1 / 25
Developer Ergonomics 13.4 / 20
Commercial Clarity 15.3 / 20
Operational Transparency 2.1 / 13
Governance 1.4 / 12
Discoverability 9.4 / 10
Agent readiness — 44/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
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 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 0 / 4
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...

MCP Servers 1

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

marketstack-mcp.yml

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

0 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: '0.20'
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