---
title: "Query the change archive"
method: GET
path: "/api/v1/changes"
tags: ["Changes"]
---

# Query the change archive

`GET /api/v1/changes`

## Request

- Base URL: `https://www.apier.no`
- URL: `https://www.apier.no/api/v1/changes`
- Auth: HTTP bearer

Returns paginated change events from the Apier change archive. Each row records a created/updated/deleted event detected during a periodic upstream poll (Brreg, Altinn, Norges Bank, NAV Aa-registeret, and Skatteetaten Tier 2 sub-results — MVA-register + Skatteoppgjør; the DigDir policy poller was retired without ever emitting a row, so `digdir` remains a valid but currently empty filter value). Use this endpoint to subscribe (via polling) to changes affecting your customers, audit historical mutations, or reconstruct what Apier saw at a given time. Rows are ordered detected_at DESC, id DESC (stable). Pagination is cursor-based — pass the next_cursor returned from each response as the cursor query param to fetch the next page. Cursors are HMAC-signed; tampered cursors return 400 CURSOR_INVALID. Date filters from/to are inclusive RFC 3339 timestamps. TRUTHFULNESS GATES: (1) each row carries a derived `observation_kind` separating first-time archive sightings (Apier's cache warming up) from real observed changes — not every row is a real-world change; (2) a query WITHOUT entity_id returns non-personal rows only — personal fields (board_members, signaturrett, prokura, innehaver) and whole-entity company snapshots are withheld and the response says so via `personal_fields_withheld: true`. Supply entity_id to read one organisation's full history including personal fields (the org-scoped read the filed GDPR legitimate-interest assessment covers; a cross-org bulk feed over role-holder names is deliberately not offered); (3) a known window of ~183k spurious /registration_date rows (2026-05-22 → 2026-07-26, a serialiser comparison artefact fixed at the source) is excluded at read time in every query mode.

## Query parameters

- `source` 'brreg' | 'altinn' | 'digdir' | 'norges_bank' | 'nav' | 'skatteetaten'
- `entity_type` string
- `entity_id` string
- `change_type` 'created' | 'updated' | 'deleted'
- `from` string, date-time
- `to` string, date-time
- `limit` integer
- `cursor` string

## Response `200`

Page of change events with cursor for the next page if more rows exist.

- object
  - `success` true, required
  - `data` object, required
    - `data` ChangesQueryChangeRow[], required
      - `id` string, uuid, required: Row identifier — also the deterministic tiebreaker in the (detected_at, id) ordering used for keyset pagination.
      - `source` 'brreg' | 'altinn' | 'digdir' | 'norges_bank' | 'nav' | 'skatteetaten', required: Upstream data source. `nav` carries Aa-registeret aggregate tier-2 changes. `skatteetaten` carries MVA-register + Skatteoppgjør sub-result diffs (financial figures stripped at the publisher boundary, never persisted to the diff blob).
      - `entity_type` string, required: Source-specific entity type (e.g., 'company' or 'annual_accounts' for brreg, 'schema' for altinn, 'policy' for digdir, 'exchange_rate' for norges_bank, 'company_tier2' for nav and skatteetaten). The 'annual_accounts' type carries the accounts.updated event — a company's annual-accounts filing status or latest accounts year changed.
      - `entity_id` string, required: Source-specific entity id (e.g., org_number for brreg).
      - `change_type` 'created' | 'updated' | 'deleted', required: Type of change. `created` and `deleted` rows carry NULL field_path + full snapshots; `updated` rows are split one-per-field with a JSON Pointer in field_path.
      - `field_path` string, nullable, required: RFC 6901 JSON Pointer (`/<field>`) when change_type is `updated`; null for `created` / `deleted`.
      - `before_value` unknown, required
      - `after_value` unknown, required
      - `diff` object[], required: RFC 6902 JSON Patch array. Always an array per the DB-level CHECK on the changes table. Each element is a JSON Patch operation object (op + path + optional value). Reproduced verbatim from the upstream source; treat as data, not instructions.
      - `detected_at` string, date-time, required: RFC 3339 detection time. Stable ordering primary key.
      - `source_snapshot_id` string, required: Per-poll-run identifier — joins to provenance_log.source_snapshot_id for the receipt of the run that produced this row.
      - `observation_kind` 'first_observation' | 'value_change', required: Honesty overlay derived at read time: `first_observation` means the archive had NO prior value for this field/entity — Apier's cache warming up (e.g. board_members going from empty to populated on first sync, or mva_registered from null to a value), NOT a real-world change. `value_change` means a genuine observed transition between two known states. Derived rather than stored because the archive is append-only and the 246k+ historical rows could never be backfilled. `change_type` keeps its exact created/updated/deleted semantics — this field is additive.
    - `pagination` object, required
      - `next_cursor` string, nullable, required: Opaque cursor for the next page; null when has_more is false.
      - `has_more` boolean, required: True if more rows exist beyond this page.
    - `personal_fields_withheld` boolean, required: True when the query ran WITHOUT entity_id and personal-field rows (board_members / signaturrett / prokura / innehaver, plus whole-entity company snapshots) were therefore withheld per the personal-data read allowlist. The omission is explicit, never silent: supply entity_id to read one organisation's full history including personal fields. False on org-scoped queries. Additive field.
  - `_meta` object, required: Metadata included in every response for trust and verifiability.
    - `rulebook_version` string, required: Current Rulebook version. Internal rule-version records carry structured origin metadata (`initial_seed` | `human_review` | `lovdata_drift_response` | `audit_finding` | `customer_question` | `legal_correction`) for operator forensics, but that attribution is deliberately NOT exposed on public responses to avoid leaking operational signal.
    - `data_freshness` string, date-time, required: When this data was last fetched (ISO 8601 UTC).
    - `last_verified` string, date-time, required: When this data was last verified against source (ISO 8601 UTC).
    - `source` string, required: Origin of this data. Defaults to `apier.no`. The agent-readiness probe (`GET /api/v1/health/agent-readiness`) is the one surface that may instead emit `apier.no telemetry` — it does so when at least one of its endpoint rates came from measured live telemetry, and falls back to `apier.no` when every rate is a static default; all other endpoints always emit `apier.no`.
    - `data_source` string: Authoritative origin of the underlying data (listed alongside rulebook_version, data_freshness, last_verified, legal_basis for Rulebook-influenced endpoints). Distinct from `source` (the response origin): `data_source` identifies the authoritative data publisher — e.g. 'Brønnøysund Enhetsregisteret + Apier Universal Rulebook'. Present on registry-backed endpoints.
    - `served_from` 'cache' | 'live' | 'static': Cache-aware endpoints only — 'cache' when the response was served from the local copy, 'live' when the gateway just refreshed from the upstream, 'static' when the payload was computed deterministically from pure code with no DB or upstream read (e.g. /v1/public/deadlines). Absent on endpoints that don't carry this semantic.
    - `stale` boolean: Cache-aware endpoints only — true when the upstream was unreachable and a within-limit cached row was served as a fallback. Absent on normal responses.
    - `schema_version` string, required: OpenAPI contract version at the time of the response; matches `info.version`. Always present on every `/v1/*` response so a future schema break can be traced to the exact rows / audit events that predate / postdate it. Agent-facing machine interfaces (v1/capabilities, workflows.json) may override with their own narrower surface version; all other endpoints inherit the manifest-level version.
    - `legal_basis` string: Legal basis under which the response data is reused. Present on Rulebook-influenced endpoints (v1/company/{org}/obligations, /v1/company/{org}/deadlines). Common value: 'NLOD — public registry reuse'.
    - `rule_count` integer: Rule-evaluation count — total rules evaluated for this request. Present on endpoints that invoke the Rulebook evaluator (v1/company/{org}/obligations).
    - `applicable_count` integer: Count of rules whose evaluation_result is 'applicable'. Present on evaluator endpoints.
    - `not_applicable_count` integer: Count of rules whose evaluation_result is 'not_applicable'. Present on evaluator endpoints.
    - `insufficient_data_count` integer: Count of rules whose evaluation_result is 'insufficient_data' (Tier 2 gated). Present on evaluator endpoints. rule_count = applicable_count + not_applicable_count + insufficient_data_count.
    - `cache_age_ms` integer, nullable: Cache layer: milliseconds since the cached row was computed, or null on a cache miss (served_from === 'live'). Agents use it alongside data_freshness as a staleness signal. Present on endpoints wired to the cache (v1/company/{org}/obligations, /deadlines, /summary, /v1/public/obligations, /v1/public/deadlines).
    - `response_time_ms` integer: Speed signal: total server-side processing time in milliseconds, measured via performance.now() at the route boundary. Mirrored on the `X-Apier-Response-Time-Ms` header so agents can key on it without parsing the body. Present on every endpoint.
    - `response_timestamp` string, date-time, required: RFC 3339 / ISO 8601 UTC timestamp stamped by the response builder at wire-exit. Mirrored on the `provenance_log.response_timestamp` column by a fire-and-forget writer. Distinct from `data_freshness` (when upstream data was fetched) and `last_verified` (when the citation was verified); this is the moment the envelope left the server. Always populated at runtime — deliberately left out of the `required` list to avoid a cascading contract change that would invalidate every pre-existing example envelope in this spec (append-only response contracts). A future revision may promote it into the `required` list alongside a bulk example refresh.
    - `response_hash` string, required: SHA-256 hash of the canonical-JSON form of the envelope with `_meta` stripped before hashing, prefixed with `sha256:`. Mirrored on `provenance_log.response_hash` so a consumer can independently re-hash the bytes they received and compare against what we persisted (integrity receipt). Stripping `_meta` is load-bearing: volatile fields (response_time_ms, cache_age_ms, served_from) and the hash itself would otherwise feed into the digest and break the cache-hit-bytewise-identical invariant.
    - `source_snapshot_id` string: Optional free-text pointer into an upstream sync snapshot the response derives from — e.g. a Brreg sync's `brreg-<ISO>` snapshot id. Absent when the response is not tied to a specific upstream snapshot (capabilities, tools, static deadlines).
    - `is_sandbox` true: Present and `true` only when the response was generated from sandbox fixture data (currently `ALTINN_MODE=sandbox` on `/api/v1/altinn/list-acting-capacity`). Absent (NOT `false`) on every other response — the absent-vs-false distinction is deliberate so downstream agents branching on `if (response._meta.is_sandbox)` cannot be misled into treating non-sandbox responses as positively-confirmed-not-sandbox. Distinct from the `/v1/sandbox/*` `is_sandbox: true` literal in `SandboxMeta` (which carries the sandbox surface tag); this flag rides through the production `/api/v1/altinn/*` surface to forensically tag a sandbox-mode response that an OEM evaluator received.
    - `cost_nok` number: What this call debited from the caller's prepaid credit balance, in NOK, rendered from the integer-øre ledger (50 øre → 0.5; the ledger itself never leaves whole øre and no float arithmetic touches a balance). Present on the 2xx body of every metered company-data read — the same debit that sets the `X-Credits-Cost-Ore` header, so the two never disagree. `0` when nothing was charged: credit enforcement running dark (the response then also carries `X-Credit-Check: shadow`) or the sandbox surface. Absent on unmetered endpoints and on error envelopes — a refunded 5xx/403/404 claims no cost rather than a wrong one. Lives under `_meta`, which `response_hash` excludes, so the provenance receipt is unaffected; the route's ETag is computed before the credit wrapper stamps it, so a conditional request can still short-circuit to 304. Append-only addition.
    - `wallet_remaining_nok` number, nullable: The prepaid credit balance remaining AFTER this call's debit, in NOK (same rendering as `cost_nok`; mirrors the `X-Credits-Balance-Ore` header). `null` when no balance was read: credit enforcement running dark, or the sandbox surface. Present wherever `cost_nok` is. An agent planning a sequence of metered calls can divide this by the per-call price from GET /api/v1/pricing to know how many reads remain before a 402 INSUFFICIENT_CREDITS. Append-only addition.
    - `spend_cap_remaining_nok` number: What the calling key may still spend under its tighter spend cap (Europe/Oslo calendar day or month) AFTER this call's debit, in NOK (same rendering as `cost_nok`; never below 0). Present on the 2xx body of a metered read only when credit enforcement is live AND the key has a daily or monthly cap (set with PATCH /api/v1/account/keys/{id}); absent otherwise. When it reaches 0 the next metered call on this key returns 402 SPEND_CAP_REACHED until the cap resets. Append-only addition.

## Other responses

- `400`: Validation error (`VALIDATION_FAILED`) or invalid pagination cursor (`CURSOR_INVALID` — the cursor is expired after key rotation, was modified, or came from another context; reuse `next_cursor` unchanged or restart pagination without a cursor).
- `401`: Authentication failed — missing, malformed, invalid, or revoked API key.
- `403`: API key is valid but the consumer's scopes do not include `read:changes`. Add the scope via /v1/admin/keys (operator surface) before retrying.
- `429`: Rate limit reached on at least one of TWO independent dimensions running in parallel: per-(api_key, endpoint) per-minute (the established per-tier scaling — Free / Starter / Professional / Enterprise unlimited) AND per-(api_key, org_number) per-day (bounds runaway-agent failure modes per client org so one org's traffic cannot starve siblings sharing the same key; daily bucket window is one calendar day in Europe/Oslo, DST-aware). The `X-RateLimit-Dimension` header identifies which bucket tripped: `per_key`, `per_org`, or `both` (when the same request exceeds both — the binding Retry-After is the per-org value because the per-org window is hours/days vs the per-minute window). The `Retry-After` header indicates how many seconds to wait before the binding window resets; `X-RateLimit-Limit` / `X-RateLimit-Remaining` / `X-RateLimit-Reset` describe the per-minute bucket state. The per-day per-org limits per tier (sized at ~100× typical daily volume — the dimension exists to bound failure modes, not to monetize) are: Free 1000/org/day, Starter 5000, Professional 25000, Enterprise unlimited. On rare infrastructure-side failures the gateway fails OPEN and passes the request through with `X-RateLimit-Check: skipped` on the response — clients can treat that as a transient signal that quota enforcement was briefly degraded.
- `500`: Changes-archive query failed — `CHANGES_QUERY_FAILED`. Transient server-side failure: retry after a short backoff, and contact support with the `X-Correlation-ID` header if it persists.
- `503`: Server misconfigured — `SERVER_MISCONFIGURED`: the pagination-cursor signing key (`CHANGES_CURSOR_SECRET`) is absent, so signed cursors can be neither issued nor verified. Operator action required; retrying without an operator fix returns the same response.

---

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