Every change, dated and tagged.

Replay headers on idempotent writes

• Replayed responses now carry a Replayed: true header for log correlation.
• Fixed a case where a replay returned a fresh posted_at instead of the original.
• Idempotency keys are no longer counted against the write rate limit on replay.

Concepts: Idempotent postings

Point-in-time balance derivation

• GET /v2/accounts/:id/balance accepts an at timestamp to derive historical balances.
• Reconciliation windows can now be opened against a statement date range.
• Added Elixir SDK at v2.1.4.

Reference: Reconciliation windows

Statement references stored verbatim

• statement_ref on a reconciliation window is now returned unmodified on read — leading zeros were previously stripped.
• Window labels accept up to 200 characters, up from 120.

Sandbox parity with live regions

• Sandbox now enforces the same 255-character cap on idempotency keys as live.
• Corrected a rounding difference in multi-currency line validation.

Webhook signature verification hardened

• Signature comparison is now constant-time in all four regions.
• Fixed a delivery attempt that could be retried twice inside the same minute of the backoff schedule.

Webhook subscriptions, scoped per event

• Webhooks are now subscribed per event type rather than per workspace.
• Breaking: the legacy /v2/hooks alias is removed. Migrate to /v2/webhooks.
• Delivery retries follow an exponential schedule over six hours.

Migration guide: From /v2/hooks to /v2/webhooks · announced 20 Feb 2026

Rust SDK and faster list pagination

• Published the Rust SDK at v2.2.7 with async support.
• Cursor pagination on GET /v2/entries is roughly 4× faster on large accounts.

Account re-tagging without touching history

• PATCH /v2/accounts/:id accepts a tags array for reporting groups.
• Renaming an account leaves every posting's recorded account name intact, so old entries still read correctly.

Guide: Renaming and re-tagging safely

Immutable entries enforced at the storage layer

• Breaking: PATCH /v2/entries/:id is removed. Post a reversing entry instead.
• Every posting now carries an append-only audit hash chained to the previous entry.

Migration guide: Off PATCH /v2/entries/:id · announced 03 Jan 2026

Multi-currency lines balance per currency

• An entry containing more than one currency must now balance independently within each — a stricter rule that caught real errors in beta workspaces.
• Fixed a case where an FX line was accepted with a zero rate.

Guide: Multi-currency lines in one entry

Sydney region, and per-region latency reporting

• ap-sydney-1 is available at workspace creation, joining Dublin, Frankfurt and Virginia.
• The status page reports p50 write latency per region rather than a single global figure.

Status: Where it runs, and how fast

Idempotency window fixed at 24 hours

• Key retention was documented as 24 hours but expired at the top of the hour in two regions. It is now exactly 24 hours from first use everywhere.
• A key reused with a changed payload returns 409 idempotency_conflict consistently, rather than 400 in some regions.

Rate-limit headers on every response

• X-RateLimit-Remaining is now present on error responses too, not only on 2xx.
• A 429 always carries Retry-After in whole seconds.

Reference: Rate limits

Balances are derived, not stored

• Breaking: the v1 stored-balance field is gone. GET /v2/accounts/:id/balance derives from the entries every time.
• Breaking: entry lines use amount in minor units with a sign, replacing v1's separate debit and credit fields.
• Every write endpoint accepts an Idempotency-Key header.
• The whole surface is eight endpoints, down from nineteen in v1.9.

Guide: Balances are derived, not stored · v1.9 in maintenance until 31 Mar 2027