Marketstack API
Agent-ready OpenAPI document · curated by JenticFinanceBankingapiKey18 EndpointsREST
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For Agents
Pull end-of-day and intraday stock prices, list tickers and exchanges, and look up dividends or splits across 70+ global stock exchanges in normalized JSON.
Use for: Get the closing price for AAPL on the last 30 trading days, Retrieve intraday quotes for TSLA at 1-minute intervals for today, Find all dividend payments for MSFT in 2025, List every ticker traded on NASDAQ that matches 'micro'
Not supported: All 18 operations in this spec are read-only market-data lookups covering end-of-day and intraday prices, tickers, exchanges, dividends, splits, currencies and timezones, with no write, order-entry, account or portfolio operations, and they describe the deprecated v1 surface rather than the current v2 API.
APILayer, which operates Marketstack, publishes its own OpenAPI specification on SwaggerHub at `https://api.swaggerhub.com/apis/apilayer-863/MarketstackAPIv2/2.0.0/swagger.json`, and that document is canonical: it describes the v2 API on api.marketstack.com/v2. The spec behind this entry is a curated, agent-optimized Jentic variant of the earlier v1 surface on api.marketstack.com/v1, which Marketstack has since deprecated in favour of v2, so treat it as a legacy view rather than the full current surface. Marketstack provides historical and real-time stock market data covering 70+ global exchanges, including end-of-day prices, intraday quotes, ticker metadata, dividends, splits, and currency or timezone reference data. The API is designed for finance applications, research notebooks, and AI agents that need normalized OHLCV data without scraping individual exchange feeds. Authentication uses a single `access_key` query parameter on every request.
Install Jentic One Beta
Connect the Marketstack API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Marketstack API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmarketstack.com%2Fmarketstack" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fmarketstack.com%2Fmarketstack" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Marketstack API.
Retrieve end-of-day OHLCV data for one or more tickers across global exchanges
Pull intraday quotes for US tickers on the IEX exchange, with intervals below 15 minutes on the Professional plan or higher
Look up ticker metadata including exchange, name, and symbol mappings
Fetch dividend history and stock split events for any listed ticker
List supported exchanges, currencies, and timezones for normalisation
Query historical end-of-day prices on a specific date for backtesting
Use Cases
Patterns agents use Marketstack API for, with concrete tasks.
★ Quantitative Backtesting
Quant researchers and individual traders need clean OHLCV data for backtesting strategies. Marketstack returns normalized end-of-day prices in JSON for tickers across 70+ exchanges, removing the need to maintain per-exchange ingestion code. A typical backtest pulls 5-10 years of EOD bars for a basket of tickers in a single batch request loop.
Call `GET /eod` with `symbols=AAPL,MSFT,GOOG` and `date_from=2024-01-01&date_to=2024-12-31` and return a daily close-price series.
Portfolio Dashboard Refresh
Personal finance dashboards and fintech apps display the latest closing price and daily change for each holding. Marketstack's `/eod/latest` endpoint returns the most recent EOD bar across requested symbols in a single call, and `/intraday/latest` handles same-day moves during market hours. Dashboards typically refresh every 5-15 minutes.
Call `GET /eod/latest?symbols=NVDA,AMD` and compute the percentage change vs the previous close.
Corporate Actions Tracking
Investment platforms need to adjust positions for dividends and splits to keep cost basis correct. Marketstack exposes dedicated `/dividends` and `/splits` endpoints filtered by symbol and date range so reconciliation jobs can detect new corporate actions and apply adjustments to historical price series.
Call `GET /dividends?symbols=KO&date_from=2025-01-01` and reconcile the dividend payments against the holdings ledger.
AI Agent Market Research
An AI investment assistant can use Jentic to call Marketstack on demand when a user asks about a stock's recent performance or dividend history. Jentic stores the `access_key` securely and exposes Marketstack operations behind intent-based search, so the agent never embeds the key in a prompt or source file.
Search Jentic for 'get latest stock price', load the Marketstack `/eod/latest` schema, and execute it for symbol 'TSLA' to answer the user's question.
Key Endpoints
18 endpoints — apilayer, which operates marketstack, publishes its own openapi specification on swaggerhub at `https://api.
METHOD
PATH
DESCRIPTION
GET
/eod
End-of-day OHLCV data for one or more tickers
GET
/eod/latest
Latest available end-of-day bar
GET
/intraday
Intraday quotes for US tickers on the IEX exchange
GET
/tickers
List or search tickers
GET
/dividends
Dividend history for tickers
GET
/splits
Stock split history for tickers
GET
/exchanges
List supported stock exchanges
GET
/eod
End-of-day OHLCV data for one or more tickers
GET
/eod/latest
Latest available end-of-day bar
GET
/intraday
Intraday quotes for US tickers on the IEX exchange
GET
/tickers
List or search tickers
GET
/dividends
Dividend history for tickers
GET
/splits
Stock split history for tickers
GET
/exchanges
List supported stock exchanges
Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring Marketstack by hand means appending its access_key query parameter, learning the /eod, /intraday, /tickers, and corporate-action paths, and paging results yourself. Through Jentic you install once, import the Marketstack API from the API Directory, store the key once, and your agent calls it.
Permission scoping
The Marketstack endpoints are read-only price and reference lookups, so scoping is by operation: you limit the agent to the operations it needs, such as fetching end-of-day prices, intraday data, or ticker dividends, and leave out the rest. Every operation you allow is one you have chosen, so the agent stays inside that set.
Credential isolation
Your Marketstack access key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'get end of day stock price' or 'list ticker dividends', and Jentic returns the matching Marketstack operation with its query schema so the agent calls the right endpoint without browsing the reference docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Marketstack API through Jentic.
Is there a Marketstack MCP server?
You do not need an MCP server to give your agent Marketstack. Jentic connects it directly from the API Directory: import Marketstack, store your access key once, and your agent can pull end-of-day prices, intraday quotes, dividends and splits, with no extra tool definitions loaded into its context.
What authentication does the Marketstack API use?
Marketstack uses an `access_key` query-string parameter on every request. Through Jentic, the key is stored encrypted in your Jentic One instance and injected at execution time so the agent never sees the raw value.
Can I get intraday stock prices with the Marketstack API?
Yes, for US tickers. Marketstack's documentation states that intraday prices are available for all US stock tickers included in the IEX (Investors Exchange) stock exchange. The `GET /intraday` endpoint returns those quotes and `GET /intraday/latest` returns the most recent intraday bar. Marketstack also states that data frequency intervals below 15 minutes are only supported on the Professional Plan or higher, so 1-minute granularity depends on your plan.
What are the rate limits for the Marketstack API?
Marketstack meters usage as a monthly request quota set by plan. The Free plan includes 100 market data API requests per month, supporting end-of-day data as well as up to 12 months of history. The quotas attached to the paid plans are listed on the Marketstack pricing page.
How do I fetch end-of-day prices through Jentic?
Install self-hosted Jentic One and register your agent, then search the API Directory by intent for 'get end of day stock price'. Jentic returns the `/eod` operation schema and your agent executes it with the tickers and date range you want, with no manual auth wiring.
Does the Marketstack API cover non-US exchanges?
Yes. Marketstack covers 70+ global stock exchanges. Use `GET /exchanges` to enumerate them and pass the appropriate MIC code via the `exchange` parameter on price queries.
Can I limit what my agent is allowed to do with the Marketstack API?
Yes. Because you run Jentic One yourself, your own rules decide which Marketstack operations the agent may call, and since every endpoint is a read-only price or reference lookup, you scope access one operation at a time. You can allow only what the agent needs, such as fetching end-of-day prices from /eod, pulling intraday quotes from /intraday, or reading dividends from /dividends, and leave out the rest. Your Marketstack access key stays under your control and is injected at execution time, so the agent never sees the raw value or reaches operations you did not grant.
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