lemon.markets
lemon.markets is a Berlin-based, BaFin-licensed investment firm that sells brokerage infrastructure as an API. Its Brokerage API lets fintechs, banks and platforms embed investing — account opening and KYC/identification, securities accounts, order placement and execution, trades, positions, transactions, withdrawals, settlements, corporate actions, income distributions, tax exemption orders (Freistellungsauftrag) and treasury products — without building or licensing a broker-dealer stack themselves. Coverage spans 10,000+ ETFs, ETPs, stocks, bonds and funds, and the platform supports omnibus, fully disclosed and BPO (business process outsourcing) operating models. The REST API is complemented by a webhook/event surface, an Idempotency-Key contract on order placement, and a sandbox environment with published test ISINs. API access 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 — 22 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 51.2/100 (developing), with a separate agent-readiness read of 84/100 (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.
lemonmarkets-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.
Lemonmarkets 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.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
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 5
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
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/lemonmarkets · machine-readable index on apis.io