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Marketstack for AI agents

Marketstack is a stock market data API providing real-time, intraday, and historical prices across thousands of tickers on exchanges worldwide. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect MarketstackSee the 19 actions ↓
Developer toolsAPI keyMCP + RESTmarketstack.com
AUDIT LOG · MARKETSTACKPOLICY: acme-support
09:41:07 · claude · u_8f2read
marketstack.list_tickers
List Tickers✓ allowed · 212ms
09:41:08 · claude · u_8f2read
marketstack.get_eod
Get End-of-Day Data✓ allowed · 164ms
EVERY MARKETSTACK CALL, ON THE RECORD
01 · USE CASES

What agents do in Marketstack.

01

Check a stock's real-time price

Pull the current price for a ticker before including it in a report, read-only.

02

Pull historical end-of-day data

Retrieve a ticker's end-of-day prices over a range to chart its recent trend.

03

Look up a stock split or dividend

Check a ticker's dividend or split history before reconciling a portfolio record.

02 · ACTIONS

19 Marketstack actions, graded by risk.

Every Marketstack action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

19

Look things up. Allowed by default.

  • marketstack.get_eod
    Get End-of-Day Data
  • marketstack.get_splits
    Get Stock Splits
  • marketstack.get_exchange
    Get Exchange Info
  • marketstack.get_intraday
    Get Intraday Data
  • marketstack.list_tickers
    List Tickers
  • marketstack.get_dividends
    Get Dividends
  • marketstack.get_ticker_eod
    Get Ticker EOD Data
  • marketstack.list_exchanges
    List Stock Exchanges
  • marketstack.get_stock_price
    Get Real-Time Stock Price
  • marketstack.get_ticker_info
    Get Ticker Info
  • marketstack.list_currencies
    List Currencies
  • marketstack.get_intraday_date
    Get Intraday Data for Date
  • marketstack.get_intraday_latest
    Get Intraday Latest Data
  • marketstack.get_ticker_intraday
    Get Ticker Intraday Data
  • marketstack.get_exchange_intraday
    Get Exchange Intraday Data
  • marketstack.get_ticker_eod_latest
    Get Ticker EOD Latest
+ 3 MORE

write

0

Create and change things. Allow, or ask the user first.

  • No write actions.

destructive

0

Delete, cancel or archive. Ask first, or deny outright.

  • No destructive actions.
03 · HOW IT WORKS

Marketstack in three steps.

  1. 01Your users connect MarketstackThey add their Marketstack api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, and writes like “updates” can wait for the user to approve.
  3. 03Any agent can actYour agent calls Marketstack through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('marketstack', {
  read: 'allow',
  write: 'ask',        
  destructive: 'deny',  
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Marketstack connects.

Users add their Marketstack api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Marketstack connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Marketstack from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More developer tools apps.

GitHub896 actionsSupabase129 actions0CodeKit8 actionsAbly25 actionsAbstract3 actionsAddressfinder17 actionsAddresszen2 actionsAlchemy36 actions
ALL DEVELOPER TOOLS APPS →
07 · FAQ

Marketstack and Arc0, answered.

Q01

Can I use Marketstack with Claude, ChatGPT or Cursor?

Yes. Connect Marketstack to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Marketstack actions you allow.

Q02

How do users connect Marketstack?

Users add their Marketstack api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Marketstack actions can my agent take?

19 in total: 19 read, 0 write and 0 destructive. Your policies decide which of them each agent may call.

Q04

Can I make my agent read-only in Marketstack?

Yes. Allow read actions and deny writes in the Marketstack policy. Your agent can still look things up, and any write it attempts is blocked and logged.

Q05

Can my own backend call Marketstack too?

Yes. The same Marketstack connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Marketstack into your agent.

Your users connect Marketstack once, under your brand. Your agent gets 19 actions behind your policies, with every call on the record.

Connect MarketstackBrowse all apps →

Free to build · MCP + REST · Audit log on every plan