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.

Sygnum publishes 10 APIs on the APIs.io network. Tagged areas include Company, Banking, Digital Assets, Cryptocurrency, and Custody.

The Sygnum catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Sygnum’s developer surface includes documentation, API reference, getting-started guide, signup flow, support, engineering blog, pricing, and 26 more developer resources.

🌐 Visit website 📡 Source on GitHub
53.7/100 developing ▬ flat Agent 41/100 agent ready Full breakdown ↓
scored 2026-09-01 · rubric v0.17.2
10 APIs
CompanyBankingDigital AssetsCryptocurrencyCustodyTradingStakingTokenizationSettlementMarket DataFinancial-ServicesSwitzerlandSingaporeB2B

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-01 · rubric v0.17.2
Composite quality — 53.7/100 · developing
Contract Quality 9.1 / 21
Developer Ergonomics 10.9 / 17
Access Clarity 8.9 / 17
Operational Transparency 2.3 / 11
Contract Governance 1.9 / 10
Discoverability 6.9 / 9
Regulatory Posture 11.2 / 15
Agent readiness — 41/100 · agent ready
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 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 6 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 6 / 6
Agentic Commerce Surface 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Banking & Open Finance 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.
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/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/sygnum: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

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 for all 10

Pricing Plans 1

Published pricing tiers and plan structures.

Sygnum Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sygnum Rate Limits

0 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Sygnum Webhooks

ASYNCAPI

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sygnum Authentication

2 schemes

SECURITY

Sygnum Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Sygnum Vulnerability Disclosure

Hackerone · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Sygnum Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp
 Login
Login
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown
 LLMsTxt
LLMsTxt

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Conventions
Conventions
 Lifecycle
Lifecycle
 Webhooks
Webhooks

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages

Access & Security 7

Authentication, authorization, and security posture

Authentication
Authentication
 OAuthScopes
OAuthScopes
 Compliance
Compliance
 DomainSecurity
DomainSecurity
 SecurityTxt
SecurityTxt
 Security
Security
 VulnerabilityDisclosure
VulnerabilityDisclosure

Scroll for all 7

Operate 2

Status, limits, changes, and where to get help

Support
Support
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

PrivacyPolicy
PrivacyPolicy
 TermsOfService
TermsOfService
 Pricing
Pricing
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 2

Properties that don't map to a standard resource type

Imprint
Imprint
 OpenIDConnect
OpenIDConnect

Source (apis.yml)

apis.yml Raw ↑ 
aid: sygnum
name: Sygnum
description: 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.
url: https://raw.githubusercontent.com/api-evangelist/sygnum/refs/heads/main/apis.yml
image: https://avatars.githubusercontent.com/sygnumbank
x-type: company
x-source: harvest:secondary-market
x-tier: profiled
x-tier-reason: enrichment
specificationVersion: '0.20'
created: '2026-08-29'
modified: '2026-08-29'
tags:
- Company
- Banking
- Digital Assets
- Cryptocurrency
- Custody
- Trading
- Staking
- Tokenization
- Settlement
- Market Data
- Financial-Services
- Switzerland
- Singapore
- B2B
tags_raw:
- Company
- Banking
- Digital Assets
- Cryptocurrency
- Custody
- Trading
- Staking
- Tokenization
- Settlement
- Market Data
- Financial Services
- Switzerland
- Singapore
- B2B
apis:
- name: Sygnum Banking API
  description: 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.
  humanURL: https://developer.sygnum.com/banking
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Banking
  - Account
  - Balances
  tags_raw:
  - Banking
  - Accounts
  - Balances
  properties:
  - type: Authentication
    url: authentication/sygnum-authentication.yml
- name: Sygnum Trading API
  description: 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.
  humanURL: https://developer.sygnum.com/trading
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Trading
  - Order
  - FIX
  tags_raw:
  - Trading
  - Orders
  - FIX
  properties:
  - type: FIX
    url: https://developer.sygnum.com/trading/fix
  - type: Webhooks
    url: asyncapi/sygnum-webhooks.yml
- name: Sygnum Custody API
  description: Endpoint set designed for bank clients to fetch account balances held in Sygnum's institutional-grade digital
    asset custody environment.
  humanURL: https://developer.sygnum.com/custody
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Custody
  - Digital Assets
- name: Sygnum Staking API
  description: Regulated Ethereum staking for retail and institutional clients — real-time staking, automated rewards, flexible
    amounts and portfolio tracking — with a webhook channel for staking lifecycle events.
  humanURL: https://developer.sygnum.com/staking
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Staking
  - Ethereum
  - Rewards
  properties:
  - type: Webhooks
    url: asyncapi/sygnum-webhooks.yml
- name: Sygnum Wallet API
  description: Wallet service API covering wallet resources attached to Sygnum staking and digital asset accounts.
  humanURL: https://developer.sygnum.com/staking/wallet
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Wallets
  - Digital Assets
  tags_raw:
  - Wallet
  - Digital Assets
- name: Sygnum Digital Transfer API
  description: Digital asset transfer service API for moving assets in and out of Sygnum, with a webhook channel for transfer
    status events.
  humanURL: https://developer.sygnum.com/staking/digital-transfer
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Transfers
  - Digital Assets
  properties:
  - type: Webhooks
    url: asyncapi/sygnum-webhooks.yml
- name: Sygnum Protect API
  description: 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.
  humanURL: https://developer.sygnum.com/protect
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Off-Exchange Custody
  - Collateral
- name: Sygnum Connect API
  description: API for Sygnum Connect, the bank's 24/7 instant multi-asset settlement network for crypto assets, stablecoins
    and fiat between member institutions.
  humanURL: https://developer.sygnum.com/connect
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Settlement
  - Payments
  - Stablecoins
- name: Sygnum Market Data API
  description: Market data service exposed as REST plus a streaming WebSocket channel, so partners can stream prices and monitor
    markets inside their own systems.
  humanURL: https://developer.sygnum.com/market-data
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Market Data
  - Streaming
  - WebSocket
  properties:
  - type: WebSocket
    url: https://developer.sygnum.com/market-data/web-socket
- name: Sygnum Access Management API
  description: 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 their access to Sygnum APIs.
  humanURL: https://developer.sygnum.com/client-management
  baseURL: https://api.sygnum.com/b2b
  tags:
  - Access Management
  - Authentication
  - Credentials
  tags_raw:
  - Access Management
  - OAuth
  - Credentials
  properties:
  - type: OAuthScopes
    url: scopes/sygnum-scopes.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://www.sygnum.com/
- type: DeveloperPortal
  url: https://developer.sygnum.com/
- type: Documentation
  url: https://developer.sygnum.com/catalog
- type: APIReference
  url: https://developer.sygnum.com/catalog
- type: GettingStarted
  url: https://developer.sygnum.com/how-to-connect
- type: SignUp
  url: https://start.join.sygnum.com/
- type: Login
  url: https://developer.sygnum.com/login
- type: Support
  url: https://www.sygnum.com/help/
- type: Blog
  url: https://www.sygnum.com/future-finance/
- type: GitHubOrganization
  url: https://github.com/sygnumbank
- type: PrivacyPolicy
  url: https://www.sygnum.com/privacy-notice/
- type: TermsOfService
  url: https://www.sygnum.com/terms-of-use/
- type: Imprint
  url: https://www.sygnum.com/imprint/
- type: Pricing
  url: https://www.sygnum.com/help/accounts/custody-fees-at-sygnum/
- type: Plans
  url: plans/sygnum-plans-pricing.yml
- type: RateLimits
  url: rate-limits/sygnum-rate-limits.yml
- type: Authentication
  url: authentication/sygnum-authentication.yml
- type: OAuthScopes
  url: scopes/sygnum-scopes.yml
- type: WellKnown
  url: well-known/sygnum-well-known.yml
- type: OpenIDConnect
  url: well-known/sygnum-auth-openid-configuration.json
- type: Conformance
  url: conformance/sygnum-conformance.yml
- type: Compliance
  url: conformance/sygnum-conformance.yml
- type: ErrorCatalog
  url: errors/sygnum-problem-types.yml
- type: Conventions
  url: conventions/sygnum-conventions.yml
- type: Lifecycle
  url: lifecycle/sygnum-lifecycle.yml
- type: Sandbox
  url: sandbox/sygnum-sandbox.yml
- type: Webhooks
  url: asyncapi/sygnum-webhooks.yml
- type: DomainSecurity
  url: security/sygnum-domain-security.yml
- type: Packages
  url: packages/sygnum-packages.yml
- type: LLMsTxt
  url: llms/sygnum-llms.txt
- type: SecurityTxt
  url: well-known/sygnum-security.txt
- type: Security
  url: security/sygnum-vulnerability-disclosure.yml
- type: VulnerabilityDisclosure
  url: security/sygnum-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-08-29'
  status: enriched
  artifacts_added: 18
  pass: local-v1
x-coverage:
  state: gated
  reason: customer-only-docs
  detail: 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.
  evidence:
  - url: https://api.sygnum.com/b2b/v1/assets/content/dev-portal-assets-map
    status: 401
  - url: https://api.sygnum.com/b2b/v1/available-scopes
    status: 401
  - url: https://developer.sygnum.com/
    status: 200
  checked: '2026-08-29'

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