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@ftptech/x402-canton-ledger

v0.1.1

Published

Shared Canton ledger primitives — JSON Ledger API v2 client, Ed25519 external-party signing, Scan API client. Used by @ftptech/x402-canton-facilitator and @ftptech/x402-canton-client.

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Links

Git

Maintainers

ftptechftptech

Keywords

x402cantoncanton-networkdamljson-ledger-apisplice

Readme

@ftptech/x402-canton-ledger

Shared Canton ledger primitives used by both @ftptech/x402-canton-facilitator (server side) and @ftptech/x402-canton-client (payer side).

Install

npm i @ftptech/x402-canton-ledger

Note: the @ftp npm scope is not final — it may change before the first public release (see docs/PUBLISHING.md). Pin the version you install and check the README for the current package name.

What's in here

  • CantonClient — JSON Ledger API v2 wrapper. Encodes the documented gotchas (template id #package:Module:Entity, wrapped vs flat body shapes per endpoint, disclosedContracts, Daml Int as JSON string). Includes submitAndWaitForTransaction, submitAndWait, queryActiveContracts, getLedgerEnd, and the interactiveSubmissionPrepare + interactiveSubmissionExecute pair used for external-party signing.
  • CantonExternalPartySigner + ed25519KeyFromNodeKeyPair
    • signPreparedTransactionHash — Ed25519 signing primitives over /v2/interactive-submission/prepare + /execute. Lets an agent hold its own key and authorize commands without surrendering it to a participant.
  • ScanClient — Scan API reader for AmuletRules, open-and-issuing mining rounds, completed transfers via getUpdateById, transfer-kind resolution (resolveTransferKind), and traffic-status. Validator-proxy + SV-direct flavors.

Why a separate package

Facilitator-side domain wrappers (Cip56InstructionService, MerchantContractService, PreapprovalService) live in @ftptech/x402-canton-facilitator because they encode the facilitator's role (Scan-read verify, MerchantContract template, preapproval provider). The lower-level Canton plumbing in this package is reusable by anyone — including the client SDK's Cip56KeyfileSigner, which uses CantonExternalPartySigner to submit a TransferFactory_Transfer from the agent's own participant.

Project

github.com/sunstrike228/canton-x402.