aid: thetadata
url: https://raw.githubusercontent.com/api-evangelist/thetadata/refs/heads/main/apis.yml
name: ThetaData
kind: company
description: ThetaData is a developer-first US market data vendor founded in 2022 by Bailey Danseglio,
  selling real-time and historical options, stocks, indices, and interest-rates data with unfiltered tick-level
  trades, quotes, and Greeks. Delivery is self-serve via the Theta Terminal, a local Java application
  that authenticates with an API key or account credentials and exposes a local REST API (127.0.0.1:25503/v3),
  a WebSocket streaming API (127.0.0.1:25520), and an MCP server, backed by a published OpenAPI 3.1 spec,
  Python library, flat files, and tiered monthly subscriptions.
accessModel:
  pricing: freemium
  onboarding: self-service
  trial: true
  try_now: true
  public: true
  label: Freemium, self-service signup
  confidence: high
  source:
  - https://thetadata.net/pricing
  - https://docs.thetadata.us/Articles/Getting-Started/Subscriptions.html
  - https://docs.thetadata.us/Articles/Getting-Started/Sample-Data.html
  generated: '2026-07-22'
  method: searched
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/thetadata.png
tags:
- Financial
- Market Data
- Options
- Stocks
- Indices
- Real-Time
- Historical Data
- Trading
created: '2026-07-21'
modified: '2026-07-22'
specificationVersion: '0.19'
apis:
- aid: thetadata:thetadata-streaming-websocket-api
  name: ThetaData Streaming WebSocket API
  tags:
  - Streaming
  - WebSocket
  - Trades
  - Quotes
  - Real-Time
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.thetadata.us/Streaming/Getting-Started.html
  baseURL: ws://127.0.0.1:25520/v1/events
  properties:
  - url: https://docs.thetadata.us/Streaming/Getting-Started.html
    type: Documentation
  - type: AsyncAPI
    url: asyncapi/thetadata-streaming-asyncapi.yml
  description: JSON WebSocket streaming of US stock trade/quote, options trade/quote, and index price
    streams, served locally by the Theta Terminal at ws://127.0.0.1:25520/v1/events. Requires a paid subscription
    with streaming permissions; a single connection per user is permitted, with CONNECTED/DISCONNECTED
    status headers and QUOTE/TRADE/STATUS message types.
- aid: thetadata:thetadata-mcp-server
  name: ThetaData MCP Server
  tags:
  - MCP
  - Agents
  - SSE
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://docs.thetadata.us/Mcp/Getting-Started.html
  baseURL: http://127.0.0.1:25503/mcp/sse
  properties:
  - url: https://docs.thetadata.us/Mcp/Getting-Started.html
    type: Documentation
  - type: MCPServer
    url: mcp/thetadata-mcp.yml
  - type: ToolCrosswalk
    url: mcp/thetadata-tool-crosswalk.yml
  description: Model Context Protocol server built into Theta Terminal v3, exposing the full v3 API to
    LLM CLIs (documented for Claude CLI and Gemini CLI) over SSE at http://127.0.0.1:25503/mcp/sse. Requires
    the terminal running locally and a valid ThetaData subscription.
- aid: thetadata:thetadata-at-time-api
  name: ThetaData At-Time API
  description: The At-Time API from ThetaData — 5 operation(s) for at-time.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - At-Time
  properties:
  - type: OpenAPI
    url: openapi/thetadata-at-time-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-at-time-api-overlay.yaml
- aid: thetadata:thetadata-calendar-api
  name: ThetaData Calendar API
  description: The Calendar API from ThetaData — 3 operation(s) for calendar.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Calendar
  properties:
  - type: OpenAPI
    url: openapi/thetadata-calendar-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-calendar-api-overlay.yaml
- aid: thetadata:thetadata-flatfile-api
  name: ThetaData FlatFile API
  description: The FlatFile API from ThetaData — 6 operation(s) for flatfile.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - FlatFile
  properties:
  - type: OpenAPI
    url: openapi/thetadata-flatfile-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-flatfile-api-overlay.yaml
- aid: thetadata:thetadata-history-api
  name: ThetaData History API
  description: The History API from ThetaData — 26 operation(s) for history.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - History
  properties:
  - type: OpenAPI
    url: openapi/thetadata-history-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-history-api-overlay.yaml
- aid: thetadata:thetadata-index-api
  name: ThetaData Index API
  description: The Index API from ThetaData — 10 operation(s) for index.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Index
  properties:
  - type: OpenAPI
    url: openapi/thetadata-index-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-index-api-overlay.yaml
- aid: thetadata:thetadata-interest-rate-api
  name: ThetaData Interest Rate API
  description: The Interest Rate API from ThetaData — 1 operation(s) for interest rate.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Interest Rate
  properties:
  - type: OpenAPI
    url: openapi/thetadata-interest-rate-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-interest-rate-api-overlay.yaml
- aid: thetadata:thetadata-list-api
  name: ThetaData List API
  description: The List API from ThetaData — 9 operation(s) for list.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - List
  properties:
  - type: OpenAPI
    url: openapi/thetadata-list-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-list-api-overlay.yaml
- aid: thetadata:thetadata-option-api
  name: ThetaData Option API
  description: The Option API from ThetaData — 37 operation(s) for option.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Option
  properties:
  - type: OpenAPI
    url: openapi/thetadata-option-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-option-api-overlay.yaml
- aid: thetadata:thetadata-single-day-api
  name: ThetaData Single Day API
  description: The Single Day API from ThetaData — 2 operation(s) for single day.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Single Day
  properties:
  - type: OpenAPI
    url: openapi/thetadata-single-day-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-single-day-api-overlay.yaml
- aid: thetadata:thetadata-snapshot-api
  name: ThetaData Snapshot API
  description: The Snapshot API from ThetaData — 17 operation(s) for snapshot.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Snapshot
  properties:
  - type: OpenAPI
    url: openapi/thetadata-snapshot-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-snapshot-api-overlay.yaml
- aid: thetadata:thetadata-stock-api
  name: ThetaData Stock API
  description: The Stock API from ThetaData — 15 operation(s) for stock.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Stock
  properties:
  - type: OpenAPI
    url: openapi/thetadata-stock-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-stock-api-overlay.yaml
- aid: thetadata:thetadata-year-api
  name: ThetaData Year API
  description: The Year API from ThetaData — 1 operation(s) for year.
  humanURL: https://docs.thetadata.us/
  baseURL: http://127.0.0.1:25503/v3
  tags:
  - Year
  properties:
  - type: OpenAPI
    url: openapi/thetadata-year-api-openapi.yml
  - type: Documentation
    url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
  - type: APIReference
    url: https://docs.thetadata.us/operations/stock_list_symbols.html
  - type: Overlay
    url: overlays/thetadata-year-api-overlay.yaml
common:
- type: DomainSecurity
  url: security/thetadata-domain-security.yml
- type: Website
  url: https://thetadata.net/
- type: Portal
  url: https://thetadata.net/portal
- type: Documentation
  url: https://docs.thetadata.us/
- type: Blog
  url: https://thetadata.net/blog
- type: Pricing
  url: https://thetadata.net/pricing
- type: SignUp
  url: https://thetadata.net/signup
- type: TermsOfService
  url: https://thetadata.net/terms-and-conditions
- type: PrivacyPolicy
  url: https://thetadata.net/privacy-policy
- type: Support
  url: https://discord.thetadata.us/
- type: StatusPage
  url: https://thetadata.statuspage.io/
- type: LinkedIn
  url: https://www.linkedin.com/company/axiomx-theta-data
- type: GettingStarted
  url: https://docs.thetadata.us/Articles/Getting-Started/Getting-Started.html
- type: APIReference
  url: https://docs.thetadata.us/
- type: Roadmap
  url: https://thetadata.net/roadmap
- type: GitHubOrganization
  url: https://github.com/AXIOMXLLC
- type: SampleData
  url: https://docs.thetadata.us/Articles/Getting-Started/Sample-Data.html
- type: Packages
  url: packages/thetadata-packages.yml
- type: SDKs
  url: packages/thetadata-packages.yml
- type: WellKnown
  url: well-known/thetadata-well-known.yml
- type: LLMsTxt
  url: llms/thetadata-llms.txt
- type: Conformance
  url: conformance/thetadata-conformance.yml
- type: ErrorCatalog
  url: errors/thetadata-problem-types.yml
- type: Lifecycle
  url: lifecycle/thetadata-lifecycle.yml
- type: Deprecation
  url: https://docs.thetadata.us/Articles/Getting-Started/v2-migration-guide.html
- type: Authentication
  url: authentication/thetadata-authentication.yml
- type: Sandbox
  url: sandbox/thetadata-sandbox.yml
- type: Conventions
  url: conventions/thetadata-conventions.yml
- type: Idempotency
  url: conventions/thetadata-conventions.yml
- type: ChangeLog
  url: changelog/thetadata-changelog.yml
- type: Components
  url: components/thetadata-components.yml
- type: DataModel
  url: data-model/thetadata-data-model.yml
- type: RateLimits
  url: rate-limits/thetadata-rate-limits.yml
- type: Plans
  url: plans/thetadata-plans.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com