Product Primitive

Ledgers That Keep Money State Visible

Anchor payments, transfers, accounts, and reconciliation in ledger behavior that remains inspectable after retries, provider drift, and support escalation.

Docs
  • 01Minor-unit entries
  • 02Double-entry discipline
  • 03Audit-linked history
Contract Runtime
LoopBackward compatible

Versioned contracts with low-drift integration behavior.

Operating pillars

4

Capability layers rendered with explicit operational behavior.

Visual center

Ledger spine

Minor-unit debits and credits tied to actors, tenants, policies, and event history.

Runtime model

Deterministic

Replay-safe money and identity workflows under retry pressure.

Control boundary

Tenant-scoped

Isolation across authorization, data access, and operator actions.

Operating model

Every money mutation becomes balanced entries, explicit posting state, and exportable evidence.

Entrypoint

POST /ledger-entries

01Intent

Receive money intent

Payments, transfers, cards, or account changes declare what should move.

02Balance

Create debit and credit

Minor-unit ledger entries preserve exact accounting behavior.

03Post

Commit mutation

Posting boundaries prevent duplicate effects under replay pressure.

04Event

Publish ledger event

Downstream systems receive signed state changes with correlation identifiers.

05Export

Seal audit packet

Finance and compliance can inspect the actor, tenant, policy, and entries.

Events emitted

ledger.entry.created
ledger.entry.posted
ledger.balance.updated
ledger.export.ready

Evidence retained

debit_account
credit_account
minor_units
posting_id
correlation_id
Failure path proof

Ledger mutations remain explainable.

Every debit, credit, posting boundary, replay decision, and exportable audit record stays tied to the money movement.

01

Replay pressure

Incident

A service retries the same money-writing operation after losing its response.

Zentra path

The posting boundary resolves replay posture before balances can change again.

Evidence

Posting ID, idempotency key, debit account, credit account, and replay result are retained.

02

Balance investigation

Incident

Finance needs to explain why an account balance changed during closeout.

Zentra path

Entries, source event, actor, and policy context are available from one ledger trail.

Evidence

Entry IDs, minor units, source event, account IDs, and timestamp are retained.

Lifecycle proof

From API request to operational evidence.

This page makes the runtime visible: POST /ledger-entries, the state path, emitted events, and evidence a team can inspect when the happy path breaks.

Get Started
Docs
Book Architecture Review

API request

live

await zentra.runtime.intents.create({

intent_id: "intent_042",

scope: "workspace_scope",

money_model: "minor_units + ledger_currency",

primitives: ["policy", "ledger", "events"]

})

intent accepted
workspace scope resolved
runtime trace attached

Runtime state machine

01Accept intentruntime contractaccepted
02Resolve controlsscope + policycontrolled
03Post ledger stateminor-unit entriesledgered
04Select routecorridor contextrouted
05Sync eventssigned streamsynchronized
06Seal evidenceactor + scope + timeevidenced

Ledger entries

debitcustomer_balance-125000 mu
creditreserved_balance+125000 mu
debitreserved_balance-125000 mu
creditsettlement_account+125000 mu

Audit evidence

actorsvc_runtime
scopeworkspace_scope
policylimit_check.passed
signatureverified
Capability model

Operational building blocks, not vague feature claims.

Each pillar below maps product capability to runtime behavior teams can reason about before launch.

01

Minor-unit entries

Represent money without floating-point ambiguity or hidden rounding behavior.

02

Double-entry discipline

Preserve debit and credit balance across holds, releases, reversals, and settlement.

03

Idempotent posting

Protect ledger mutation boundaries when clients, providers, or services retry.

04

Audit-linked history

Attach actor, tenant, timestamp, policy, and event context to each money storyline.

Visual center

Ledger spine

Minor-unit debits and credits tied to actors, tenants, policies, and event history.

  • Keep minor-unit entries deterministic under retries, delays, and asynchronous callbacks.
  • Expose state transitions and error semantics clearly enough for operators and integrators to act.
  • Capture audit events with tenant and actor attribution for regulated review workflows.

API to product

The integration should create visible state.

A buyer should see the first call, the system response, the webhook behavior, and the ledger/audit consequence without leaving the product page.

post ledger entry

await zentra.ledgers.post({
  debit: "customer_balance",
  credit: "reserved_balance",
  amount_minor: 125000,
  idempotency_key: "led_8172"
})

System response

status

posted

event

ledger.entry.created

evidence

debit_account

entrypoint

POST /ledger-entries

The first integration proof should show POST /ledger-entries, emitted events, retained evidence, and visible product state.

Webhook replay

01timeoutevent ledger.entry.createdretained
02signature verifiedevent ledger.entry.createdretrying
03deliveredevent ledger.entry.createdresolved

Result: one ledger-safe state transition

Delivery state remains visible without creating duplicate financial state.

Ledger flow

account

Customer

-125000 mu

account

Reserved

+125000 mu

account

Settlement

+125000 mu

account

Merchant

+125000 mu

account

Payout

closed

Operational proof

Evidence that the capability behaves correctly when production gets noisy.

The proof points below are written to be checked by operators, solution engineers, and compliance teams, not just admired in a brand presentation.

Docs

Ledger behavior is treated as product surface, not an internal accounting detail.

Retries and duplicate callbacks resolve against explicit mutation boundaries before balances change.

Finance, support, and compliance teams inspect one ledger-backed event trail instead of parallel records.

Trust layer

Audit evidence travels with the capability.

Every primitive page needs proof that state, actor, tenant, signature, and policy context remain reviewable after the happy path breaks.

Trust evidence

The proof stays attached to the runtime state.

actorsvc_runtime
scopeworkspace_scope
timestamp2026-04-26T14:12:09Z
policylimit_check.passed
intentintent_042
signatureverified
ledgerentry_042
statusaudit_ready