# Sygnum

> Sygnum is a FINMA-regulated Swiss digital asset banking group (Zurich, with entities in
> Singapore and Abu Dhabi) that sells its banking stack to other institutions through a B2B
> API layer. The catalogue covers Banking, Trading (REST and FIX), Custody, Staking, Wallet,
> Digital Transfer, Sygnum Protect (off-exchange custody), Sygnum Connect (24/7 instant
> multi-asset settlement) and Market Data (REST and WebSocket).

generated: 2026-08-29
method: generated
source: api-evangelist enrichment of https://developer.sygnum.com + live probes of api.sygnum.com and auth.sygnum.com

## What an agent can and cannot do here

- Base URL: https://api.sygnum.com/b2b (routes observed under /b2b/v1).
- Auth: OAuth 2.0 client credentials from https://auth.sygnum.com/oauth/token, sent as
  `Authorization: Bearer`. Clients are created in the portal's Access Management screen and
  authenticate with private_key_jwt (key identifier + public key/certificate + expiry).
- The machine-readable specifications EXIST but are NOT public. The developer portal offers
  a "Download specification" control per API, served from
  https://api.sygnum.com/b2b/v1/assets/content/dev-portal-assets-map, which returns HTTP 401
  to anonymous callers. There is no public OpenAPI, no GraphQL, no MCP server and no A2A
  agent card.
- Access follows a bank client relationship: "Become a client", then the Sygnum team issues
  UAT test credentials, then production.
- No rate limits are published and none are signalled in response headers.

## APIs

- [Banking](https://developer.sygnum.com/banking): real-time balances across fiat, digital
  assets and traditional securities, with role-based permissions.
- [Trading (REST)](https://developer.sygnum.com/trading): order management and execution for
  digital asset trading.
- [Trading (FIX)](https://developer.sygnum.com/trading/fix): the same trading service over
  the FIX protocol, published as its own specification.
- [Trading webhooks](https://developer.sygnum.com/trading/web-hook): asynchronous trade events.
- [Custody](https://developer.sygnum.com/custody): account balances in Sygnum's
  institutional-grade custody environment.
- [Staking](https://developer.sygnum.com/staking): regulated Ethereum staking, rewards and
  portfolio tracking, plus [staking webhooks](https://developer.sygnum.com/staking/web-hook).
- [Wallet](https://developer.sygnum.com/staking/wallet): wallet resources.
- [Digital Transfer](https://developer.sygnum.com/staking/digital-transfer): asset transfers
  in and out, plus
  [transfer webhooks](https://developer.sygnum.com/staking/digital-transfer/web-hook).
- [Sygnum Protect](https://developer.sygnum.com/protect): off-exchange custody — an exchange
  can verify a client's collateral held at Sygnum via API.
- [Sygnum Connect](https://developer.sygnum.com/connect): 24/7 instant settlement of crypto,
  stablecoins and fiat between member institutions.
- [Market Data](https://developer.sygnum.com/market-data): prices and market state, with a
  [WebSocket stream](https://developer.sygnum.com/market-data/web-socket).
- [Access Management](https://developer.sygnum.com/client-management): create and scope Auth0
  clients and their credentials.

## Errors

Vendor envelope, not RFC 9457:

    {"errors":[{"message":"..."}],"path":"/b2b/v1/available-scopes","status":"B2B.0006","timestamp":"2026-08-29 15:18:23"}

`B2B.0006` = missing or invalid authentication credentials (HTTP 401).

## Docs and identity

- Developer portal: https://developer.sygnum.com/
- How to connect: https://developer.sygnum.com/how-to-connect
- API catalogue: https://developer.sygnum.com/catalog
- B2B banking overview: https://www.sygnum.com/b2b-banking/
- Sygnum Connect: https://www.sygnum.com/sygnum-connect/
- Support portal: https://www.sygnum.com/help/
- Research and insights: https://www.sygnum.com/future-finance/
- News: https://www.sygnum.com/news/
- Become a client: https://start.join.sygnum.com/
- GitHub (smart contracts only): https://github.com/sygnumbank
- Security contact: mailto:security@sygnum.com (https://www.sygnum.com/.well-known/security.txt)
- Terms of use: https://www.sygnum.com/terms-of-use/
- Privacy notice: https://www.sygnum.com/privacy-notice/
- Regulatory disclosures: https://www.sygnum.com/regulatory-disclosures/

## Compliance

FINMA banking and securities dealer licence (26 August 2019); custody environment certified
under ISAE 3000 and ISAE 3402; FIPS 140-2 Level 3 key-management hardware; Tier IV Swiss data
centres. No public ISO 27001 or SOC 2 claim was found, and no trust center is published.