Sygnum
Sygnum is a regulated digital asset banking group, headquartered in Zurich with a Singapore arm, that received a Swiss FINMA banking and securities dealer licence in August 2019. It provides institutional custody, spot and derivatives trading, staking, tokenisation, Lombard lending and 24/7 instant settlement for banks, asset managers, exchanges and corporates. Its B2B business is delivered through an API layer published at developer.sygnum.com — a catalogue covering Banking, Trading (REST and FIX), Custody, Staking, Wallet, Digital Transfer, Sygnum Protect (off-exchange custody), Sygnum Connect (instant settlement) and Market Data (REST and WebSocket) — served from the api.sygnum.com/b2b gateway and secured with OAuth 2.0 client credentials issued from the bank's Auth0 tenant at auth.sygnum.com. The specifications themselves are downloadable only to authenticated Sygnum clients from the developer portal.
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 Sygnum the way a machine reads it — 17 machine-readable artifacts across 10 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 — Sygnum scores 53.4/100 (developing), with a separate agent-readiness read of 41/100 (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.
Why this profile is thin
Sygnum's developer portal ships a "Download specification" control for each of its ten B2B APIs, but the specifications are served from https://api.sygnum.com/b2b/v1/assets/content/dev-portal-assets-map, which returns HTTP 401 to anyone who is not a logged-in Sygnum client — the portal's own copy says registration requires an existing client relationship.
An API exists — we simply could not reach the contract without credentials or a sales conversation. This one is Sygnum's to change: publishing the reference and a machine-readable spec at a public URL, while keeping key issuance behind whatever gate they like, would let an integrator evaluate the API before committing to a call.
What we probed
https://api.sygnum.com/b2b/v1/assets/content/dev-portal-assets-map→ HTTP 401https://api.sygnum.com/b2b/v1/available-scopes→ HTTP 401https://developer.sygnum.com/→ HTTP 200
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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-01 · rubric v0.18.0
Put this on your own site. The badge is drawn live from Sygnum's current Kin Score — paste it once and it updates itself every time the score is recomputed. It follows your visitor's light or dark setting, and it links back here so anyone who sees it can read the full breakdown.
<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/sygnum/"
title="Sygnum on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/sygnum.svg"
alt="Sygnum Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
</a>[](https://providers.apievangelist.com/providers/sygnum/)<!-- Kin Score · API Evangelist -->
<a href="https://providers.apievangelist.com/providers/sygnum/"
title="Sygnum on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/sygnum/card.svg"
alt="Sygnum Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Sygnum
Each block below is one kind of artifact we hold for Sygnum. 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 10
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.
Sygnum Banking API
Real-time account and balance retrieval across fiat, digital assets and traditional securities held at Sygnum, with role-based permissions, exposed to B2B partners as REST.
Sygnum Trading API
Order management and execution for Sygnum's digital asset trading service, offered over both REST and the FIX protocol, with a webhook channel for asynchronous trade events.
Sygnum Custody API
Endpoint set designed for bank clients to fetch account balances held in Sygnum's institutional-grade digital asset custody environment.
Sygnum Staking API
Regulated Ethereum staking for retail and institutional clients — real-time staking, automated rewards, flexible amounts and portfolio tracking — with a webhook channel for stak...
Sygnum Wallet API
Wallet service API covering wallet resources attached to Sygnum staking and digital asset accounts.
Sygnum Digital Transfer API
Digital asset transfer service API for moving assets in and out of Sygnum, with a webhook channel for transfer status events.
Sygnum Protect API
API for Sygnum Protect, the bank's off-exchange custody solution that lets exchanges verify client collateral held at Sygnum without moving it onto the venue.
Sygnum Connect API
API for Sygnum Connect, the bank's 24/7 instant multi-asset settlement network for crypto assets, stablecoins and fiat between member institutions.
Sygnum Market Data API
Market data service exposed as REST plus a streaming WebSocket channel, so partners can stream prices and monitor markets inside their own systems.
Sygnum Access Management API
Client-management surface of the developer portal — create and manage Auth0 clients, attach credentials (public key or certificate with a key identifier and expiry) and scope th...
Scroll within the panel for all 10 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Sygnum Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Sygnum Rate Limits
RATE LIMITSEvent 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.
Sygnum Webhooks
ASYNCAPISecurity Posture 3
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.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Resources
Every other property we hold for Sygnum — 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 5
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 7
Authentication, authorization, and security posture
Scroll within the panel for all 7 ·
Operate 2
Status, limits, changes, and where to get help
Commercial 4
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/sygnum · machine-readable index on apis.io
This is an independent, third-party profile of Sygnum, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
info@apievangelist.com
·
Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and
you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.