---
title: "GET /api/v1/schemas"
method: GET
path: "/api/v1/schemas"
tags: ["schemas"]
---

# GET /api/v1/schemas

`GET /api/v1/schemas`

## Request

- Base URL: `https://api.metagraph.sh`
- URL: `https://api.metagraph.sh/api/v1/schemas`
- Auth: none required

Fetch captured schema index.

## Response `200`

Canonical artifact wrapped in the Metagraphed API envelope.

- object
  - `data` object, required
    - `contract_version` string
    - `generated_at` string, required
    - `notes` union: Public-safe notes; may be a string or a string list depending on the adapter.
      - string
      - string[]
    - `observed_at` string
    - `promoted_at` string: When the schema-snapshots cron promoted this index into the store. Absent on a build-baked baseline the cron has not promoted.
    - `promoted_by` 'worker-cron': Which producer promoted this index. Absent on a build-baked baseline.
    - `schema_version` 1, required
    - `schemas` object[], required
      - `content_type` string, nullable
      - `drift_status` 'new' | 'changed' | 'unchanged' | 'not-captured' | 'missing-after-previous-capture', required: How this capture compares to the PREVIOUS capture of the same surface by this registry -- NOT to the subnet's live spec. `unchanged` means 'our snapshot is what it was', never 'the upstream API has not changed'. Judge currency by comparing this entry's `snapshot.observed_at` against `capture_cadence_hours` on the subnet's /api/v1/gaps `schema_parity` block.
      - `error` string, nullable
      - `hash` string, nullable
      - `netuid` integer
      - `path` string, nullable
      - `previous_hash` string, nullable
      - `schema_url` string, uri, nullable, required
      - `snapshot` object
        - `auth_detail` object, nullable
          - `location` string, nullable
          - `name` string, nullable
          - `scheme` string, nullable
          - `value_format` string, nullable
        - `auth_required` boolean
        - `auth_schemes` string[]
        - `component_schema_count` integer
        - `contract_version` string, nullable
        - `drift_status` string, nullable
        - `generated_at` string, nullable
        - `hash` string, nullable
        - `netuid` integer, nullable
        - `non_get_operation_count` integer
        - `observed_at` string, nullable
        - `openapi_version` string, nullable
        - `path_count` integer
        - `previous_hash` string, nullable
        - `schema_url` string, nullable
        - `schema_version` integer
        - `server_count` integer
        - `subnet_name` string, nullable
        - `subnet_slug` string, nullable
        - `surface_id` string, nullable
        - `surface_url` string, nullable
        - `tag_count` integer
        - `title` string, nullable
        - `version` string, nullable
      - `status` 'captured' | 'error' | 'not-captured' | 'not-found' | 'too-large' | 'unsafe', required
      - `subnet_slug` string
      - `surface_id` string, required
      - `url` string, uri
    - `source` string, required
    - `summary` object
      - `by_drift_status` CountMap, required
      - `by_status` CountMap, required
      - `schema_count` integer, required
      - `surface_count` integer, required
  - `meta` ResponseMeta, required
    - `artifact_path` string
    - `cache` 'short' | 'standard' | 'static'
    - `catalog_paging` object
      - `reason` 'catalog_changed' | 'catalog_budget_exceeded' | 'catalog_unavailable', required
    - `contract_version` string, required
    - `generated_at` string, nullable: Deterministic build content marker (epoch by default); not a wall clock. Use published_at for human-facing freshness.
    - `observed_through` string, date-time, nullable: How far the tier that answered this request has observed at all. A payload reporting no activity at or before this time is a measured absence; one whose subject is newer is outside coverage, not empty. Null when the horizon is unreadable.
    - `pagination` PaginationMeta
      - `collection` string, required
      - `cursor` integer, required
      - `limit` integer, required
      - `next_cursor` integer, nullable, required
      - `order` 'asc' | 'desc'
      - `returned` integer, required
      - `snapshot` string: Present only for page_snapshot paging. Echo as page_snapshot on subsequent pages; a changed collection or query requires a restart.
      - `sort` string, nullable
      - `total` integer, required
    - `published_at` string, date-time, nullable: Real publish time from the KV latest pointer, distinct from generated_at. Null before the first publish or when the control KV is unbound.
    - `source` string
    - `stale_contract` object: Present ONLY when the served artifact was built under an older contract than the live one (serve-time drift, #1001) — the body may predate a schema change. Mirrored on the x-metagraph-stale-contract response header for monitoring.
      - `built_under` string, required: Contract version the served artifact was built under.
      - `live` string, required: Current (live) contract version the Worker is running.
  - `ok` true, required
  - `schema_version` 1, required

## Other responses

- `304`: ETag matched and the cached response is still valid.
- `400`: Query parameters were malformed or unsupported.
- `404`: Artifact or API route was not found.
- `405`: HTTP method is not supported.
- `500`: Unexpected backend error.

---

[API](https://skmtc.dev/metagraph/apis/metagraphed-api.md) · [All operations](https://skmtc.dev/metagraph/apis/metagraphed-api/llms.txt) · [OpenAPI document](https://skmtc.dev/metagraph/apis/metagraphed-api/revisions/e29036024bb1?raw)