Clearstream

Clearstream CmaX (Triparty Collateral)

CmaX is Clearstream's triparty collateral management platform, automating collateral allocation, optimisation, margining and substitution across repo, securities lending and OTC derivative exposures. Clients instruct it over SWIFT colr.* messages and Xact File Transfer feeds, and it also has a live REST surface on the Clearstream API Platform: an unauthenticated GET to https://api-t2s-test.clearstream.com/cmax/v1 returned HTTP 403 on 2026-09-05 naming the required OAuth scopes `allow` and `cmax-api`. The operations behind that prefix are documented only in the registration-gated Deutsche Borse Digital Business Platform catalogue.

GitHub

Documentation

📖
Documentation
https://www.clearstream.com/clearstream-en/securities-services/collateral-lending-and-liquidity-solutions
📖
Documentation
https://www.clearstream.com/clearstream-en/res-library/connectivity/clearstream-api-services-2916788

Other Resources

🔗
OAuthScopes
https://raw.githubusercontent.com/api-evangelist/clearstream/refs/heads/main/scopes/clearstream-scopes.yml

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API entry from apis.yml

apis.yml Raw ↑ 
aid: clearstream:cmax
name: Clearstream CmaX (Triparty Collateral)
tags:
- Collateral Management
- Margin
- Triparty
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
humanURL: https://www.clearstream.com/clearstream-en/securities-services/collateral-lending-and-liquidity-solutions
properties:
- url: https://www.clearstream.com/clearstream-en/securities-services/collateral-lending-and-liquidity-solutions
  type: Documentation
- url: https://www.clearstream.com/clearstream-en/res-library/connectivity/clearstream-api-services-2916788
  type: Documentation
- url: scopes/clearstream-scopes.yml
  type: OAuthScopes
description: 'CmaX is Clearstream''s triparty collateral management platform, automating collateral allocation,
  optimisation, margining and substitution across repo, securities lending and OTC derivative exposures.
  Clients instruct it over SWIFT colr.* messages and Xact File Transfer feeds, and it also has a live
  REST surface on the Clearstream API Platform: an unauthenticated GET to https://api-t2s-test.clearstream.com/cmax/v1
  returned HTTP 403 on 2026-09-05 naming the required OAuth scopes `allow` and `cmax-api`. The operations
  behind that prefix are documented only in the registration-gated Deutsche Borse Digital Business Platform
  catalogue.'
baseURL: https://api.clearstream.com