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 is listed with 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 engineering blog, documentation, API reference, getting-started guide, changelog, authentication, CLI, and 18 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.0/100 thin ▬ flat Agent 30/100 agent ready Front door AI 1/6 silent Heartbeat 91/100 alive library Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

3 APIs 1 MCP Servers 1 Agent Skills

Company Technology Financial Services Brokerage Trading Stock Market Market Data Investing Fintech Cryptocurrency

Kin Score

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

Composite quality — 37.0/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 13.8 / 17

Access Clarity 0.0 / 17

Operational Transparency 2.9 / 11

Contract Governance 0.5 / 10

Discoverability 6.7 / 9

Regulatory Posture 2.4 / 15

Agent readiness — 30/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 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 5 / 5

Distinct Operations 3 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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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
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

7 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 39.0 — up to +15.3 composite points
Contract Governance scores 4.5 — up to +11.5 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/webull/apis.yml: open an issue on github.com/api-evangelist/webull 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
Agent Skills (SKILL.md packages)	coverage	40.2	-	1
Private Markets and Fund Administration (ILPA, broker-dealer registration, options market-data vendors)	coverage	40.2	-	1

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 1

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.

Agent Skills

measured — observed by APIs.io (published)

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 Server

Remote MCP server at developer.webull.com.

MCP SERVER

Agent Skills 1

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

webull-openapi

AGENT SKILL

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

AgentSkill

LLMsTxt

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Webhooks

Conventions

Idempotency

Conformance

ErrorCatalog

Lifecycle

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

SDKs

Packages

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 2

The organization behind the API

Blog

Blog

Website

Website

Other 1

Properties that don't map to a standard resource type

Protobuf

Protobuf

Source (apis.yml)

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
deliveryModel:
  model: library
  open_source: false
  commercial: false
  callable_host: false
  label: Library · distributed through package registries, no callable service
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
image: https://www.webull.com/favicon.ico
tags:
- Company
- Technology
- Financial Services
- Brokerage
- Trading
- Stock Market
- Market Data
- Investing
- Fintech
- Cryptocurrency
tags_raw:
- Company
- Technology
- Financial Services
- Brokerage
- Trading
- Stock Market
- Market Data
- Investing
- Fintech
- Cryptocurrency
- Financial-Services
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
  - Order
  - Brokerage
  tags_raw:
  - 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
  - Authentication
  tags_raw:
  - OAuth
  - Authorization
  - Authentication
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 16
  pass: local-v1
common:
- url: https://www.webull.com/blog
  type: Blog
- 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

Webull API — frequently asked questions

Does Webull have an API?

Yes. APIs.io lists 3 APIs from Webull, including Webull Trading API, Webull Market Data API and Webull Connect API.

How do I authenticate with the Webull API?

Webull uses bearer-token authentication (apiKey/http-signature/oauth2 · 3 schemes). The details are profiled on APIs.io as Webull Authentication.

Does Webull have an MCP server?

Yes. APIs.io lists 1 MCP server for Webull: Remote MCP server at developer.webull.com.

Is the Webull API ready for AI agents?

Webull has a Kin Score of 37.0 out of 100 (thin) and an Agent Readiness score of 29.5 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

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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.

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