Base
Hardened build
minimal ports, security patches applied at build time
Formance Ledger programmable double-entry financial ledger with PostgreSQL 16 on Ubuntu 24.04 LTS
Azure
Application Infrastructure
A programmable double-entry financial core ledger, recording every money movement as an immutable, atomic, balanced transaction.
Overview
Formance Ledger is an open-source financial ledger exposed as an HTTP API. It records money movements between accounts as immutable multi-posting transactions, enforces double-entry accounting invariants so every posting is balanced and normal accounts can never go implicitly negative, and is programmable in Numscript, a small domain-specific language for expressing multi-account postings. It is the state-keeping foundation for applications that move and hold funds, such as wallets, payment flows, marketplaces and lending systems.
Why the cloudimg image
cloudimg ships Formance Ledger and PostgreSQL together on one hardened, fully patched appliance that runs its schema migrations and comes up ready to accept transactions on first boot. Because the ledger holds financial records, the appliance is secure by default: the ledger and the database are bound to loopback and never routable, and the only exposed port is fronted by a reverse proxy that refuses every request without the per instance credential generated on first boot. The database passwords and the API password are all minted uniquely per instance with no default login, and 24/7 support is included.
Common uses
- User balances and wallet accounting
- Payment and settlement flows
- Marketplace and ledgering back ends
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