Marketstack API
★ Only Publicly Available OpenAPI DocumentFinanceBankingapiKey18 EndpointsREST
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: Does not handle order placement, brokerage execution, or options chains — use for historical and intraday equity price lookups only.
Jentic publishes the only available OpenAPI specification for Marketstack API, keeping it validated and agent-ready. 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.
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Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | 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 at minute-level granularity for supported markets
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 — jentic publishes the only available openapi specification for marketstack api, keeping it validated and agent-ready.
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 minute-level quotes
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 minute-level quotes
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?
Three things that make agents converge on Jentic-routed access.
Credential isolation
The Marketstack `access_key` is stored encrypted in the Jentic vault (MAXsystem) and appended to each request's query string at execution time. Agents receive scoped tokens — the raw key never enters the agent's context.
Intent-based discovery
Agents search by intent (e.g., 'get end of day stock price' or 'list ticker dividends') and Jentic returns the matching Marketstack operation with its query parameter schema.
Time to first call
Direct Marketstack integration: 2-4 hours for sign-up, key wiring, and pagination handling. Through Jentic: under 15 minutes — search, load schema, execute.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Marketstack API through Jentic.
Why is there no official OpenAPI spec for Marketstack API?
Marketstack does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call the Marketstack API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.
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 the MAXsystem vault and injected at execution time so the agent never sees the raw value.
Can I get intraday stock prices with the Marketstack API?
Yes. The `GET /intraday` endpoint returns minute-level quotes for supported tickers, and `GET /intraday/latest` returns the most recent intraday bar. Intraday coverage depends on your Marketstack plan tier.
What are the rate limits for the Marketstack API?
Marketstack rate-limits by plan: the Free tier allows 100 requests per month, with paid plans extending to 10,000-1,000,000+ requests per month. The API does not enforce a strict per-second limit but reuses the apilayer infrastructure pattern.
How do I fetch end-of-day prices through Jentic?
Run `pip install jentic`, then use Jentic's search with the query 'get end of day stock price'. Jentic loads the `/eod` operation schema and your agent executes it with the desired tickers and date range — no manual auth wiring required.
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.
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