Webull

Webull is a commission-free online brokerage whose Webull OpenAPI platform gives quantitative and algorithmic traders programmatic access to trading and market data across US and Hong Kong regions. It exposes four API products — a Trading API (place/preview/replace/cancel orders for stocks, options, futures, crypto, and event contracts, including combo OTO/OCO/OTOCO and TWAP/VWAP/POV algo orders), a Market Data API (real-time and historical snapshots, ticks, quotes/depth, footprint and OHLCV bars), a Broker API (enterprise account opening, funding, and cash journals), and a Connect API (OAuth 2.0 third-party authorization). Requests are authenticated with an App Key / App Secret pair and HMAC-SHA1 request signing, with real-time streaming over gRPC (trading events) and MQTT (market data). Webull ships official Python and Java SDKs, a Go CLI, a published MCP server, and an Agent Skill.

Webull publishes 3 APIs on the APIs.io network. Tagged areas include Company, Technology, Financial Services, Brokerage, and Trading.

The Webull catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Webull’s developer surface includes documentation, API reference, getting-started guide, changelog, authentication, CLI, sandbox, and 17 more developer resources.

🌐 Visit website 📡 Source on GitHub
35.7/100 thin ▬ flat Agent 52/100 agent ready Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
3 APIs 1 MCP Servers
CompanyTechnologyFinancial ServicesBrokerageTradingStock MarketMarket DataInvestingFintechCryptocurrency

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 35.7/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 16.1 / 20
Commercial Clarity 0.0 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 52/100 · agent ready
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/webull: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

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

Webull Trading API

Order management across stocks, options, futures, crypto, and event contracts — place, preview, replace, cancel, batch (combo OTO/OCO/OTOCO), and algo (TWAP/VWAP/POV) orders, pl...

Webull Market Data API

Real-time and historical market data — snapshots, tick data, quotes/depth, footprint, and OHLCV bars for stocks, futures, crypto, and event contracts, over HTTP and MQTT streaming.

Webull Connect API

OAuth 2.0 third-party integration for authorizing access to a Webull user's account.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

webull-mcp.yml

MCP SERVER

Event Specifications 1

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

Webull Events Webhooks

ASYNCAPI

Security Posture 2

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

Webull Authentication

apiKey/http-signature/oauth2 · 3 schemes

SECURITY

Webull Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt
 WellKnown
WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks
Webhooks
 Conventions
Conventions
 Idempotency
Idempotency
 Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 SDKs
SDKs
 Packages
Packages
 CLI
CLI

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 1

Status, limits, changes, and where to get help

ChangeLog
ChangeLog

Company 1

The organization behind the API

Website
Website

Other 1

Properties that don't map to a standard resource type

Protobuf
Protobuf

Source (apis.yml)

apis.yml Raw ↑ 
aid: webull
name: Webull
description: Webull is a commission-free online brokerage whose Webull OpenAPI platform gives quantitative and algorithmic
  traders programmatic access to trading and market data across US and Hong Kong regions. It exposes four API products — a
  Trading API (place/preview/replace/cancel orders for stocks, options, futures, crypto, and event contracts, including combo
  OTO/OCO/OTOCO and TWAP/VWAP/POV algo orders), a Market Data API (real-time and historical snapshots, ticks, quotes/depth,
  footprint and OHLCV bars), a Broker API (enterprise account opening, funding, and cash journals), and a Connect API (OAuth
  2.0 third-party authorization). Requests are authenticated with an App Key / App Secret pair and HMAC-SHA1 request signing,
  with real-time streaming over gRPC (trading events) and MQTT (market data). Webull ships official Python and Java SDKs,
  a Go CLI, a published MCP server, and an Agent Skill.
url: https://raw.githubusercontent.com/api-evangelist/webull/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- hongshan
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
image: https://www.webull.com/favicon.ico
tags:
- Company
- Technology
- Financial Services
- Brokerage
- Trading
- Stock Market
- Market Data
- Investing
- Fintech
- Cryptocurrency
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- name: Webull Trading API
  description: Order management across stocks, options, futures, crypto, and event contracts — place, preview, replace, cancel,
    batch (combo OTO/OCO/OTOCO), and algo (TWAP/VWAP/POV) orders, plus accounts, balances, positions, and instruments.
  humanURL: https://developer.webull.com/apis/docs/webull-open-api-reference
  baseURL: https://api.webull.com
  tags:
  - Trading
  - Orders
  - Brokerage
  properties:
  - type: Documentation
    url: https://developer.webull.com/apis/docs/webull-open-api-reference
- name: Webull Market Data API
  description: Real-time and historical market data — snapshots, tick data, quotes/depth, footprint, and OHLCV bars for stocks,
    futures, crypto, and event contracts, over HTTP and MQTT streaming.
  humanURL: https://developer.webull.com/apis/docs/market-data-api/subscribe-quotes
  baseURL: https://api.webull.com
  tags:
  - Market Data
  - Quotes
  - Streaming
  properties:
  - type: Documentation
    url: https://developer.webull.com/apis/docs/market-data-api/subscribe-quotes
- name: Webull Connect API
  description: OAuth 2.0 third-party integration for authorizing access to a Webull user's account.
  humanURL: https://developer.webull.com/apis/docs
  baseURL: https://api.webull.com
  tags:
  - OAuth
  - Authorization
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 16
  pass: local-v1
common:
- type: DomainSecurity
  url: security/webull-domain-security.yml
- type: Website
  url: https://webull.com
- type: DeveloperPortal
  url: https://developer.webull.com/apis/home
- type: Documentation
  url: https://developer.webull.com/apis/docs/webull-open-api-reference
- type: APIReference
  url: https://developer.webull.com/apis/docs/webull-open-api-reference
- type: GettingStarted
  url: https://developer.webull.com/apis/docs/getting-started
- type: ChangeLog
  url: https://developer.webull.com/apis/docs/changelog
- type: GitHubOrganization
  url: https://github.com/webull-inc
- type: Authentication
  url: authentication/webull-authentication.yml
- type: SDKs
  url: packages/webull-packages.yml
- type: Packages
  url: packages/webull-packages.yml
- type: CLI
  url: cli/webull-cli.yml
- type: MCPServer
  url: mcp/webull-mcp.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/webull-llms.txt
- type: Protobuf
  url: grpc/webull-events.proto
- type: Webhooks
  url: asyncapi/webull-events-webhooks.yml
- type: Conventions
  url: conventions/webull-conventions.yml
- type: Idempotency
  url: conventions/webull-conventions.yml
- type: Conformance
  url: conformance/webull-conformance.yml
- type: ErrorCatalog
  url: errors/webull-error-codes.yml
- type: Lifecycle
  url: lifecycle/webull-lifecycle.yml
- type: Sandbox
  url: sandbox/webull-sandbox.yml
- type: WellKnown
  url: well-known/webull-well-known.yml