CCPEDIAby Unity Nodes
App Development

Regarding application / Ledger API access

5 posts111 views2 likesLast activity Sep 2026

Open on Forum
  1. Abhijeet_KumarOP

    Hi Team,

    I’m integrating a Canton dApp with the Participant JSON Ledger API (HTTP /v2/...), not gRPC-only. Could you share the following?

    1. JSON Ledger API

    • Base URL that serves GET /v2/version
    • Confirm JSON HTTP is exposed (not gRPC-only)
    • Network: DevNet / TestNet / MainNet
    • Daml SDK / LF version this Participant runs (we currently build DARs for SDK 3.4.11, LF 2.2)

    2. Auth
    Bearer JWT or OAuth2 client-credentials (token URL, client id, client secret, audience, scope).
    Token lifetime / how to refresh.

    3. Ledger user
    userId for prepare/execute. Confirm if that is the JWT sub.
    Does GET /v2/authenticated-user work with this token?

    4. External Parties
    Can this user call:
    POST /v2/parties/external/generate-topology
    POST /v2/parties/external/allocate

    After I allocate a Party, how do I get CanActAs and CanReadAs for that Party on this user? (App tokens often cannot call POST /v2/users/{id}/rights.)

    5. Packages
    Who may upload DARs (POST /v2/dars vs Admin API vs console), and how vetting is done on this Participant?

    6. Synchronizer
    Synchronizer ID, or confirm GET /v2/state/connected-synchronizers is allowed — and which entry is the global one if several are listed.

    7. Interactive submission + browser
    Confirm POST /v2/interactive-submission/prepare and /execute.
    CORS for a browser origin, or should we reverse-proxy?

    Thanks,

  2. Kiryl_NODERS 1

    Hi!
    You need to ask all those details from your node provider/hoster.

  3. Abhijeet_Kumar

    @Kiryl_NODERS Thanks for your response .

    I actually tried using NAAS as well and reached out to several validators/node providers, including Kaleido, Validation Cloud, Blockdaemon Validator, and 5North Validator. However, I haven’t received a response from any of them yet.

    If you could help me get the required information or connect me with any node provider, it would be a great help. I’d really appreciate your support.

    Thanks again for your time.

  4. Kiryl_NODERS

    Actually we(at NODERS) provide NAAS as well, and could help you getting the node with all the harness for development.
    Please hit me on mrlp4@noders.team for details.

  5. Abhijeet_Kumar

    sure @Kiryl_NODERS mailed you regarding details . please check on mentioned mail address.

Back to Discussions