Idem

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About Idem

Idem provides a double-entry, event-sourced ledger designed for companies handling stablecoin payments across borders. It supports both fiat and on-chain entries within a unified model, enabling automated reconciliation of stablecoin transfers against internal records. The system maintains an immutable event log with point-in-time balance queries and ACID guarantees, ensuring data consistency. Chain readers for EVM, Solana, and Tron automatically post ledger entries when on-chain transfers confirm, transitioning transactions from PENDING to SETTLED status. An agentic-first execution layer includes PolicyGuard, AgentAuditLog, and WorkflowPlan primitives, allowing AI agents to execute multi-step ledger workflows with rollback capabilities and full audit trails. The ledger is Travel Rule-aware, supporting IVMS 101 standards and HMAC-signed actions for compliance, particularly in markets like Brazil where LGPD readiness is required. Integration is available via Kotlin SDK, REST API, or MCP server for AI agents, with support for multiple stablecoins including USDC, USDT, BRZ, and PYUSD.

Key features

Event-sourced double-entry ledger
On-chain reconciliation for EVM, Solana, and Tron
PolicyGuard for transaction validation
AgentAuditLog for HMAC-signed audit trails
WorkflowPlan for multi-step agentic operations
Kotlin SDK and REST API integration
MCP server for AI agent compatibility
Travel Rule compliance with IVMS 101

Use cases

Cross-border stablecoin payment reconciliation
AI agent workflows for automated ledger operations
Compliance-ready audit trails for fintech operations

Pros

Double-entry, event-sourced ledger with ACID guarantees
Automated on-chain reconciliation for EVM, Solana, and Tron
Agentic-first execution layer with rollback and audit trails
Travel Rule-aware compliance with IVMS 101 support
Open-source under FSL-1.1-ALv2 license with self-hosting option

Cons

Version 0.1.0 indicates early-stage software
Limited ecosystem visibility with 9 GitHub stars
No explicit cloud-hosted service offering

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Frequently asked questions about Idem

What is Idem and what problem does it solve?

Idem is an open-source double-entry, event-sourced ledger designed for companies handling stablecoin payments across borders. It solves the problem of manual reconciliation by automatically posting ledger entries when on-chain transfers confirm, transitioning transactions from PENDING to SETTLED status.

Who should use Idem?

Idem is built for cross-border payment service providers (PSPs), fintechs, and financial institutions that settle transactions using stablecoins. It is particularly useful for those needing automated reconciliation between fiat and on-chain entries.

How does Idem handle compliance and audit trails?

Idem is Travel Rule-aware and supports IVMS 101 standards with HMAC-signed actions for compliance. It maintains a full audit trail for every agent and human action, ensuring LGPD readiness for Brazilian fintechs.

What stablecoins and blockchains does Idem support?

Idem supports multiple stablecoins including USDC, USDT, BRZ, and PYUSD. It includes chain readers for EVM, Solana, and Tron, enabling reconciliation across Ethereum, Base, Polygon, Solana, and Tron networks.

How can I integrate Idem into my system?

Idem offers integration via Kotlin SDK, REST API, or MCP server for AI agents. You can start by cloning the GitHub repository, running it locally with Docker, or pulling the Docker image directly.

Is Idem open source?

Yes, Idem is open source under the FSL-1.1-ALv2 license. The ledger core is fully open, allowing self-hosting, code audits, and contributions.