Lemon Markets
lemon.markets is a Berlin-based, BaFin-licensed Brokerage-as-a-Service provider that sells white-label investment infrastructure as an API. Partners embed securities trading in their own products without holding a licence or operating custody, order routing, settlement, tax and reporting themselves. The Brokerage API covers account opening and KYC/ID+V, business and BPO accounts, securities accounts, instruments and prices across 10,000+ ETFs, stocks, bonds and funds, single and batch orders, trades, positions and financials, withdrawals and balance sweeps, corporate actions and income distributions, treasury mandates and transfers, German tax exemption orders (Freistellungsauftrag), documents, cash settlement, and recurring-investment workflows for savings plans. It is a REST API over JSON with bearer API-key auth, cursor pagination, an Idempotency-Key header on order creation, HMAC-signed webhooks across 83 event types, and a sandbox environment with published test ISINs. The API is invite-only.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Lemon Markets the way a machine reads it — 21 machine-readable artifacts across 17 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 — Lemon Markets scores 51.4/100 (developing), with a separate agent-readiness read of 69/100 (agent native). 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 Lemon Markets
Each block below is one kind of artifact we hold for Lemon Markets. 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 17
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.
Lemon Markets Accounts: General API
The Accounts: General API from Lemon Markets — 6 operation(s) for accounts: general.
Lemon Markets Accounts: ID+V API
The Accounts: ID+V API from Lemon Markets — 3 operation(s) for accounts: id+v.
Lemon Markets Batch Orders API
The Batch Orders API from Lemon Markets — 4 operation(s) for batch orders.
Lemon Markets Businesses API
The Businesses API from Lemon Markets — 5 operation(s) for businesses.
Lemon Markets Cash Settlement API
The Cash Settlement API from Lemon Markets — 5 operation(s) for cash settlement.
Lemon Markets Corporate Actions API
The Corporate Actions API from Lemon Markets — 6 operation(s) for corporate actions.
Lemon Markets Documents API
The Documents API from Lemon Markets — 4 operation(s) for documents.
Lemon Markets Events + Webhooks API
The Events + Webhooks API from Lemon Markets — 3 operation(s) for events + webhooks.
Lemon Markets Instruments API
The Instruments API from Lemon Markets — 4 operation(s) for instruments.
Lemon Markets Money + Positions API
The Money + Positions API from Lemon Markets — 9 operation(s) for money + positions.
Lemon Markets Orders API
The Orders API from Lemon Markets — 4 operation(s) for orders.
Lemon Markets Persons API
The Persons API from Lemon Markets — 4 operation(s) for persons.
Lemon Markets Securities Accounts API
The Securities Accounts API from Lemon Markets — 2 operation(s) for securities accounts.
Lemon Markets Taxes API
The Taxes API from Lemon Markets — 4 operation(s) for taxes.
Lemon Markets Trades API
The Trades API from Lemon Markets — 2 operation(s) for trades.
Lemon Markets Treasury Mandates API
The Treasury Mandates API from Lemon Markets — 9 operation(s) for treasury mandates.
Lemon Markets Workflows API
Use workflows to perform repetitive tasks automatically.
Scroll within the panel for all 17 ·
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.
lemon-markets-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.
Lemon Markets Brokerage 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 Lemon Markets — 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 7
Pagination, idempotency, versioning, errors, and events
Scroll within the panel for all 7 ·
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 5
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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