Twelve Data
Twelve Data is a financial market data provider offering real-time and historical data for stocks, forex, cryptocurrencies, ETFs, indices, commodities, and funds through a single REST API and a real-time WebSocket. Coverage spans time series (OHLCV), quotes and prices, 100-plus technical indicators, reference and catalog data, and company fundamentals. Every request is authenticated with an apikey and metered as API credits; a free Basic plan grants 800 API credits per day. Real-time price streaming is delivered over a WebSocket at wss://ws.twelvedata.com/v1/quotes/price.
Twelve Data publishes 6 APIs on the APIs.io network, including WebSocket Streaming API, Core Data API, Fundamentals API, and 3 more. Tagged areas include Market Data, Financial Data, Stocks, Forex, and Crypto.
The Twelve Data catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.
Twelve Data’s developer surface includes authentication, documentation, support, engineering blog, CLI, changelog, sandbox, and 32 more developer resources.
Kin Score
APIs 6
Individual APIs this provider publishes, each with its own machine-readable definition.
Twelve Data WebSocket Streaming API
Real-time price streaming over a persistent, bidirectional WebSocket at wss://ws.twelvedata.com/v1/quotes/price. Clients authenticate with an apikey query parameter, send JSON s...
Twelve Data Core Data API
Real-time quotes, latest prices, and end-of-day data.
Twelve Data Fundamentals API
Company profiles, statements, dividends, earnings, and analysis.
Twelve Data Reference Data API
Catalogs of instruments, exchanges, and supporting metadata.
Twelve Data Technical Indicators API
100+ technical analysis indicators computed over time series.
Twelve Data Time Series API
Historical and real-time OHLCV time series.
Open Collections 1
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Twelve Data REST API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Twelvedata Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Twelvedata Finops
FINOPSEvent Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Twelve Data Real-Time Price WebSocket
AsyncAPI 2.6 description of Twelve Data's **real-time price WebSocket**. Unlike a one-way HTTP Server-Sent Events stream, this is a genuine, bidirectional WebSocket (`wss://`) s...
ASYNCAPISpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Twelve Data API Rules
SPECTRALSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 5
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 5
SDKs, sample code, and the tooling you integrate with
Access & Security 4
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API