Blnk is an open-source ledger & financial core for shipping fintech products fast.
A double entry ledger implementation in PostgreSQL
Trust & reputation layer for AI agents. Agent Credit Score (300-850) + Merkle-anchored ledger + behavioral finance + EWMA anomaly detection. Memory + payments + identity + fraud in one SDK. npm i @mnemopay/sdk
Event-sourced, double-entry ledger core in Go. Zero dependencies. Enforces balance, idempotency, deterministic replay, and currency isolation.
A Spring Boot and React banking architecture implementing a double-entry ledger, idempotent UPI transaction processing, and deterministic pessimistic locking.
AI-driven general ledger with cryptographic audit trail. Conversational accounting via 50 MCP tools for Claude.
Production-ready Fintech Wallet Service built with .NET, Clean Architecture, DDD, CQRS, and Event-Driven patterns. Implements Double-entry Ledger, Idempotency, Inbox/Outbox, Reservation, Promo Credit, and Refund workflows. Uses EF Core, Dapper, SQL Server, Redis, Kafka, gRPC-ready contracts, and background workers for reliable processing. Designed
A complete central exchange (CEX) running entirely inside PostgreSQL — matching + settlement in PL/pgSQL, driven by PostgREST + Supabase Realtime + Auth. No app server in the request path. 纯 PostgreSQL 交易所。
Institutional stablecoin treasury & settlement platform: immutable double-entry ledger, Temporal money-movement workflows, treasury/settlement/reconciliation, and a quant analytics read-model.
EUPayGrid: Kurumsal Mutabakat Protokolu (ISP) icin permissioned institutional settlement MVP (FastAPI + Next.js + Railway + Vercel).
Correct, idempotent, concurrency-safe double-entry ledger with ISO 20022 payment processing (pain.001 → pacs.008 → pacs.002) and a reconciliation engine. Proves exactly-once under duplicate/concurrent payments.
Core de pagos en Java 21 / Spring Boot: ledger de doble entrada append-only, idempotencia y concurrencia segura, con un servidor MCP (OAuth2.1) para auditoria asistida por IA y firma post-cuantica (ML-DSA) del journal.
Money Tracker — hardcore Java (Spring Boot 3.4.1) backend + Next.js 14 frontend. Never-negative double-entry envelope ledger on a multi-tenant, RLS-isolated Postgres core. JWT+RBAC, idempotent CSV/PDF ingestion, 22 JUnit/Testcontainers test classes.
Quote-to-settlement remittance engine in Spring Boot: double-entry ledger, async payout saga with retries/circuit-breaking/dead-lettering, corridor rate limiting, and distributed tracing.
Provider-agnostic TypeScript building blocks for reliable payment integrations: idempotency, double-entry ledger, webhook signature verification.
Go + PostgreSQL double-entry ledger service with ACID transactions, deferred constraints, deterministic lock ordering, Dockerized setup, and benchmarked invariant checks.
Architecture for an AI-agent wagering platform — double-entry ledger, pluggable licensing/compliance (design write-up)
Telegram Mini App — bet on real-world events at live Polymarket odds, plus four provably-fair instant games. Full-stack React + Go + PostgreSQL, TON & Telegram Stars payments, double-entry ledger.
Double-entry ledger engine — Saga payments with compensation, BigDecimal precision, idempotency, audit log
High-throughput multi-tenant double-entry ledger (Kotlin/Spring Boot, Postgres + Kafka + MongoDB)
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