Twelve Data MCP Server
for AI Agents
Connect your AI agent to StackOne's Twelve Data MCP server and give it 24 MCP tools out of the box. Auth, tool execution, and security all managed.
StackOne 
Coverage
24 Agent Actions
Create, read, update, and delete across Twelve Data — and extend your agent's capabilities with custom actions.
Authentication
Agent Tool Authentication
Per-user OAuth in one call. Your Twelve Data MCP server gets session-scoped tokens with zero credentials stored on your infra.
Agent Auth →
Security
Agent Protection
Every Twelve Data tool response scanned for prompt injection in milliseconds — 88.7% accuracy, all running on CPU.
Prompt Injection Defense →
Performance
Max Agent Context. Min Cost.
Free up to 96% of your agent's context window to enhance reasoning and reduce cost, on every Twelve Data call.
Tools Discovery →What is the Twelve Data MCP Server?
A Twelve Data MCP server lets AI agents read and write Twelve Data data through the Model Context Protocol — Anthropic's open standard for connecting LLMs to external tools. StackOne's Twelve Data MCP server ships with 24 pre-built actions, fully extensible via the Connector Builder — plus managed authentication, prompt injection defense, observability, and agent execution runtime. Connect it from MCP clients like Claude Desktop, Claude Code, Cursor, Goose, and VS Code, or from agent frameworks like OpenAI Agents SDK, LangChain, and Vercel AI SDK.
All Twelve Data MCP Tools
Every action from Twelve Data's API, ready for your agent. Create, read, update, and delete — scoped to exactly what you need.
Other (24)
- List Technical Indicators
List all technical indicators supported by Twelve Data with their parameters and output values
- Get RSI
Get Relative Strength Index values for an instrument at a chosen interval
- Get MACD
Get Moving Average Convergence Divergence values for an instrument at a chosen interval
- Get SMA
Get Simple Moving Average values for an instrument at a chosen interval
- Get EMA
Get Exponential Moving Average values for an instrument at a chosen interval
- Get Bollinger Bands
Get Bollinger Bands values for an instrument at a chosen interval
- Get Price
Get the latest price for a stock, forex pair, or cryptocurrency
- Get Quote
Get the latest quote with OHLC, volume, and 52-week range for an instrument
- Get Time Series
Get historical OHLCV bars for an instrument at a chosen interval
- Get End Of Day Price
Get the latest end-of-day closing price for an instrument
- Get Exchange Rate
Get the real-time exchange rate for a currency pair
- Search Symbols
Search instruments by ticker or name across all asset classes
- List Stocks
List available stock symbols, filterable by symbol, exchange, or country
- List Forex Pairs
List available forex pairs, filterable by symbol or currency
- List Cryptocurrencies
List available cryptocurrency pairs, filterable by symbol, exchange, or currency
- List ETFs
List available exchange-traded funds, filterable by symbol, country, fund family, or fund type
- List Exchanges
List available equity exchanges, filterable by asset type, name, MIC code, or country
- List Cryptocurrency Exchanges
List available cryptocurrency exchanges
- Get Market State
Get the current open or closed state of stock exchanges with time to next open or close
- List Countries
List countries with their ISO codes, capitals, and currencies
- List Instrument Types
List all available financial instrument types
- Get Earliest Timestamp
Get the earliest available datetime for an instrument at a given interval
- Get API Usage
Get the current API credit usage and plan limit for the connected key
- Convert Currency
Convert an amount between two currencies using the real-time exchange rate
Set Up Your Twelve Data MCP Server in Minutes
One endpoint. Any framework. Your agent is talking to Twelve Data in under 10 lines of code.
Agent Frameworks
JSON{
"mcpServers": {
"stackone": {
"command": "npx",
"args": [
"-y",
"mcp-remote@latest",
"https://api.stackone.com/mcp?x-account-id=<account_id>",
"--header",
"Authorization: Basic <YOUR_BASE64_TOKEN>"
]
}
}
}Platform Resources
MCP Code Mode: Keeping Tool Responses Out of Agent Context
Anthropic's code_execution processes data already in context. Custom MCP code mode keeps raw tool responses in a sandbox. 14K tokens vs 500.
11 min
Comparing BM25, TF-IDF, and Hybrid Search for MCP Tool Discovery
Benchmarking BM25, TF-IDF, and hybrid search for MCP tool discovery across 916 tools. The 80/20 TF-IDF/BM25 hybrid hits 21% Top-1 accuracy in under 1ms.
10 min
Indirect Prompt Injection Defense for MCP Tools: A Technical Guide
MCP tools that read emails, CRM records, and tickets are indirect prompt injection vectors. Here's how we built a two-tier defense that scans tool results in ~11ms.
12 min
MCP vs A2A: Architecture, Security, and When to Use Each
MCP vs A2A: what each protocol standardizes, how they differ, their shared security risks including indirect prompt injection, and when to use one, both, or a hybrid architecture.
12 min
MCP vs API: What 200+ Connector Builds Taught Us
MCP wraps APIs, it doesn't replace them. After building 200+ connectors that serve both, here's when each approach wins.
14 min read
Twelve Data MCP Server FAQ
Does StackOne have a Twelve Data MCP server?
Twelve Data MCP server vs direct API integration — what's the difference?
How does Twelve Data authentication work for AI agents?
origin_owner_id.Are Twelve Data MCP tools vulnerable to prompt injection?
What is the context bloat of a Twelve Data agent and how do I avoid it?
Can I limit which actions my Twelve Data agent can access?
Can I create custom agent actions for my Twelve Data MCP server?
When should I NOT use a Twelve Data MCP server?
What AI frameworks and AI clients does the StackOne Twelve Data MCP server support?
Put your AI agents to work
All the tools you need to build and scale AI agent integrations, with best-in-class connectivity, execution, and security.