ThetaData

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.

ThetaData publishes 7 API contracts indexed on the APIs.io network, including Streaming WebSocket API, Calendar API, Index API, and 4 more. Tagged areas include Finance, Market Data, Options, Stocks, and Indices.

The ThetaData catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

ThetaData’s developer surface includes developer portal, documentation, engineering blog, pricing, signup flow, support, getting-started guide, and 36 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

63.1/100 strong ▬ flat Agent 30/100 agent ready Front door AI 1/6 silent Heartbeat 100/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemiumFree trial⚡ Free to try

1 published contract 3 Agent Skills

Finance Market Data Options Stocks Indices Real-Time Historical Data Trading

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 63.1/100 · strong

Contract Quality 10.2 / 21

Developer Ergonomics 11.8 / 17

Access Clarity 14.3 / 17

Operational Transparency 8.7 / 11

Contract Governance 1.9 / 10

Discoverability 5.6 / 9

Regulatory Posture 4.3 / 15

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Show this score on your site.

It updates itself when the score changes. Paste this where you link to your API docs:

<a href="https://apis.io/providers/thetadata/"><img src="https://apis.io/badge/thetadata/card.svg" alt="ThetaData on APIs.io — Kin Score by API Evangelist"></a>

Other styles, a README pill and a shields.io endpoint are on the badge page.

Raise your score.

Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Pagination +5 pts — share of collection GETs (an array, or one wrapped in data/items/results ...) that declare a page/limit/offset/cursor parameter, a Link header or a next/cursor field; na with no collection GETs

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 48.2 — up to +13.0 composite points
Contract Governance scores 18.2 — up to +9.8 composite points
Developer Ergonomics scores 69.6 — up to +6.1 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/thetadata/apis.yml: open an issue on github.com/api-evangelist/thetadata to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Private Markets and Fund Administration (ILPA, broker-dealer registration, options market-data vendors)	coverage	24.9 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

ThetaData Streaming WebSocket API

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 ...

ThetaData MCP Server

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/mc...

ThetaData Calendar API

The Calendar API from ThetaData — 3 operation(s) for calendar.

ThetaData Index API

The Index API from ThetaData — 10 operation(s) for index.

ThetaData Interest Rate API

The Interest Rate API from ThetaData — 1 operation(s) for interest rate.

ThetaData Option API

The Option API from ThetaData — 37 operation(s) for option.

ThetaData Stock API

The Stock API from ThetaData — 15 operation(s) for stock.

Scroll for all 7

Postman Collections 12

Ready-to-run Postman collections for exercising this provider's APIs.

Theta Data v3 At-Time API

POSTMAN

Theta Data v3 At-Time Calendar API

POSTMAN

Theta Data v3 At-Time FlatFile API

POSTMAN

Theta Data v3 At-Time History API

POSTMAN

Theta Data v3 At-Time Index API

POSTMAN

Theta Data v3 At-Time Interest Rate API

POSTMAN

Theta Data v3 At-Time List API

POSTMAN

Theta Data v3 At-Time Option API

POSTMAN

Theta Data v3 At-Time Single Day API

POSTMAN

Theta Data v3 At-Time Snapshot API

POSTMAN

Theta Data v3 At-Time Stock API

POSTMAN

Theta Data v3 At-Time Year API

POSTMAN

Scroll for all 12

Open Collections 12

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Theta Data v3 At-Time API

OPEN COLLECTION

Theta Data v3 At-Time Calendar API

OPEN COLLECTION

Theta Data v3 At-Time FlatFile API

OPEN COLLECTION

Theta Data v3 At-Time History API

OPEN COLLECTION

Theta Data v3 At-Time Index API

OPEN COLLECTION

Theta Data v3 At-Time Interest Rate API

OPEN COLLECTION

Theta Data v3 At-Time List API

OPEN COLLECTION

Theta Data v3 At-Time Option API

OPEN COLLECTION

Theta Data v3 At-Time Single Day API

OPEN COLLECTION

Theta Data v3 At-Time Snapshot API

OPEN COLLECTION

Theta Data v3 At-Time Stock API

OPEN COLLECTION

Theta Data v3 At-Time Year API

OPEN COLLECTION

Scroll for all 12

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Pull historical option data for research or backtesting

AGENT SKILL

Snapshot a live option chain with Greeks

AGENT SKILL

Read a stock's market day (calendar, history, live snapshot)

AGENT SKILL

ThetaData API pricing

Prices published by ThetaData, read 2026-10-28 from thetadata.net/pricing.

Plan	Price
Options Value	$40 per month Includes: 100% market coverage; US Index & Stocks; Real-time access; 2 concurrent requests; 3 Request types; 6
Options Standard	$80 per month Includes: 4 concurrent requests; 7 Request types; 10 Years of data; Tick level data; Option Chain Snapshots; 1
Options Pro	$160 per month Includes: 8 concurrent requests; 12 Request types; 14 Years of data; Tick level data; Option Root Snapshots; S

Plan details, limits and sources →

Rate limits

Free tier requests: 20 requests per minute
FREE concurrent requests: 1 concurrent requests
VALUE concurrent requests: 2 concurrent requests

All 6 limits →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Thetadata Plans

3 plans

PLANS

Thetadata Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Thetadata Rate Limits

6 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

ThetaData

SLA

FinOps 1

Cost, billing, and metering signals for API financial operations.

Thetadata Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

ThetaData Streaming WebSocket API (derived)

JSON WebSocket streaming of US stock trade/quote, option trade/quote/full-trade, and index price/market-value streams, served locally by Theta Terminal v3. A single connection p...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

ThetaData API Rules

36 rules · 32 errors 3 warnings 1 info

SPECTRAL

OpenAPI Overlays 12

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Thetadata At Time Api Overlay

2 actions · update · thetadata-at-time-api-openapi.yml

DERIVED

Thetadata Calendar Api Overlay

2 actions · update · thetadata-calendar-api-openapi.yml

DERIVED

Thetadata Flatfile Api Overlay

2 actions · update · thetadata-flatfile-api-openapi.yml

DERIVED

Thetadata History Api Overlay

2 actions · update · thetadata-history-api-openapi.yml

DERIVED

Thetadata Index Api Overlay

2 actions · update · thetadata-index-api-openapi.yml

DERIVED

Thetadata Interest Rate Api Overlay

2 actions · update · thetadata-interest-rate-api-openapi.yml

DERIVED

Thetadata List Api Overlay

2 actions · update · thetadata-list-api-openapi.yml

DERIVED

Thetadata Option Api Overlay

2 actions · update · thetadata-option-api-openapi.yml

DERIVED

Thetadata Single Day Api Overlay

2 actions · update · thetadata-single-day-api-openapi.yml

DERIVED

Thetadata Snapshot Api Overlay

2 actions · update · thetadata-snapshot-api-openapi.yml

DERIVED

Thetadata Stock Api Overlay

2 actions · update · thetadata-stock-api-openapi.yml

DERIVED

Thetadata Year Api Overlay

2 actions · update · thetadata-year-api-openapi.yml

DERIVED

Scroll for all 12

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Thetadata Authentication

apiKey/credentials · 2 schemes

SECURITY

Thetadata Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

Portal

SignUp

GettingStarted

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Idempotency

Components

DataModel

Scroll for all 7

Build 5

SDKs, sample code, and the tooling you integrate with

PostmanWorkspace

PostmanWorkspace

GitHubOrganization

SampleData

Packages

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 6

Status, limits, changes, and where to get help

Support

StatusPage

Roadmap

Deprecation

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Other 7

Properties that don't map to a standard resource type

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Overlay

Scroll for all 7

Source (apis.yml)

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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
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
x-docs-platform: vitepress
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-17
tags:
- Finance
- Market Data
- Options
- Stocks
- Indices
- Real-Time
- Historical Data
- Trading
tags_raw:
- Financial
- Market Data
- Options
- Stocks
- Indices
- Real-Time
- Historical Data
- Trading
created: '2026-07-21'
modified: '2026-07-22'
specificationVersion: '0.23'
apis:
- aid: thetadata:thetadata-streaming-websocket-api
  name: ThetaData Streaming WebSocket API
  tags:
  - Streaming
  - WebSocket
  - Trade
  - Quotes
  - Real-Time
  tags_raw:
  - 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: X-MCPServerCandidate
    url: mcp/thetadata-mcp.yml
    note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list
      derived from the published API contracts, not an existing server. The scorer already read the manifest and reported
      mcp_server correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
  - 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-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-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-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-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:
  - Stocks
  tags_raw:
  - 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
common:
- type: Overlay
  url: overlays/thetadata-at-time-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-flatfile-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-history-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-list-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-single-day-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-snapshot-api-overlay.yaml
- type: Overlay
  url: overlays/thetadata-year-api-overlay.yaml
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/thetadata/overview
- 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

ThetaData API — frequently asked questions

Does ThetaData have an API?

Yes. APIs.io lists 7 APIs from ThetaData, including ThetaData Streaming WebSocket API, ThetaData MCP Server and ThetaData Calendar API, and 4 more.

Is there an OpenAPI specification for the ThetaData API?

Yes. APIs.io indexes 5 OpenAPI specifications for ThetaData, each linked for download from this page.

How do I authenticate with the ThetaData API?

ThetaData uses bearer-token authentication (apiKey/credentials · 2 schemes). The details are profiled on APIs.io as Thetadata Authentication.

How much does the ThetaData API cost?

ThetaData publishes its prices; its Options Value plan is $40 per month as of 2026-10-28. APIs.io lists 3 pricing plans for ThetaData, with each plan's price, limits and inclusions under Pricing on this page.

Is the ThetaData API ready for AI agents?

ThetaData has a Kin Score of 63.1 out of 100 (strong) and an Agent Readiness score of 30.3 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/thetadata"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/thetadata/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/thetadata/evidence"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.