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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Marketstack the way a machine reads it — 21 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Marketstack scores 55.6/100 (strong), with a separate agent-readiness read of 29/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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title="Marketstack on API Evangelist — API profile and Kin Score">
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Marketstack
Each block below is one kind of artifact we hold for Marketstack. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 15
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Marketstack Bonds API
The Bonds API from Marketstack — 2 operation(s) for bonds.
Marketstack Commodities API
The Commodities API from Marketstack — 2 operation(s) for commodities.
Marketstack Company Ratings API
The Company Ratings API from Marketstack — 1 operation(s) for company ratings.
Marketstack Currencies API
The Currencies API from Marketstack — 1 operation(s) for currencies.
Marketstack Dividends API
The Dividends API from Marketstack — 1 operation(s) for dividends.
Marketstack EDGAR API
The EDGAR API from Marketstack — 6 operation(s) for edgar.
Marketstack End Of Day API
The End-of-day API from Marketstack — 3 operation(s) for end-of-day.
Marketstack ET Fs API
The ETFs API from Marketstack — 2 operation(s) for etfs.
Marketstack Exchanges API
The Exchanges API from Marketstack — 9 operation(s) for exchanges.
Marketstack Indexes API
The Indexes API from Marketstack — 2 operation(s) for indexes.
Marketstack Intraday API
The Intraday API from Marketstack — 3 operation(s) for intraday.
Marketstack Splits API
The Splits API from Marketstack — 1 operation(s) for splits.
Marketstack Stock Prices API
The Stock Prices API from Marketstack — 1 operation(s) for stock prices.
Marketstack Tickers API
The Tickers API from Marketstack — 10 operation(s) for tickers.
Marketstack Timezones API
The Timezones API from Marketstack — 1 operation(s) for timezones.
Scroll within the panel for all 15 ·
Open Collections 1
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Marketstack API v2
OPEN COLLECTIONMCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
marketstack (community)
MCP SERVERPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Marketstack Plans
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Marketstack Rate Limits
RATE LIMITSSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Marketstack — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 3
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/marketstack · machine-readable index on apis.io
This is an independent, third-party profile of Marketstack, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.