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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Webull the way a machine reads it — 7 machine-readable artifacts across 3 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Webull scores 35.7/100 (thin), with a separate agent-readiness read of 52/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Webull
Each block below is one kind of artifact we hold for Webull. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 3
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
webull-mcp.yml
MCP SERVEREvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Webull Events Webhooks
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Webull — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 3
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 4
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 1
The organization behind the API
Other 1
Properties that don't map to a standard resource type
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