Bem
Bem Knowledge Graph API

Read the cross-document knowledge graph — the canonical entities and the directed relations between them that the Parse pipeline populates when `linkAcrossDocuments` is enabled. - **`GET /v3/entities/{id}/relations`** returns the inbound and outbound edges incident to one entity, split by direction. Supports `direction`, an exact `relationType` filter, and cursor pagination over edges. A merged-away entity id transparently resolves to its surviving canonical entity. - **`GET /v3/knowledge-graph`** returns the graph as `{ nodes, edges }`, paginating over edges. The `nodes` for a page are the distinct endpoint entities of that page's edges (both endpoints of every edge are included). Filter with `type[]`, `since`, and `search`; an edge is returned only when both of its endpoints survive the entity filters. Both endpoints take an optional `bucket` (`bkt_...`) to scope the read to a single bucket; omit it for the unscoped account+environment view.
Documentation GitHub OpenAPI
Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/bem/refs/heads/main/openapi/bem-knowledge-graph-api-openapi.yml
OpenAPI Specification

openapi: 3.1.0
info:
  title: Bem Buckets Knowledge Graph API
  version: 1.0.0
  description: "Buckets are named partitions of the knowledge graph within an\naccount+environment. Entities, mentions, and relations are scoped to a\nbucket so a single account+environment can host multiple isolated graphs\n— for example one per data source or workspace.\n\nEvery account+environment has exactly one **default** bucket, used by\nunscoped flows. The default bucket can be renamed but never deleted.\n\nUse these endpoints to create, list, fetch, rename, and delete buckets:\n\n- **`POST /v3/buckets`** creates a non-default bucket.\n- **`GET /v3/buckets`** lists buckets with cursor pagination\n  (`startingAfter` / `endingBefore` over `bucketID`).\n- **`PATCH /v3/buckets/{bucketID}`** updates `name` and/or `description`.\n- **`DELETE /v3/buckets/{bucketID}`** soft-deletes a bucket. A non-empty\n  bucket is rejected with `409 Conflict` unless `?cascade=true` is\n  passed; the default bucket can never be deleted."
servers:
- url: https://api.bem.ai
  description: US Region API
  variables: {}
- url: https://api.eu1.bem.ai
  description: EU Region API
  variables: {}
security:
- API Key: []
tags:
- name: Knowledge Graph
  description: "Read the cross-document knowledge graph — the canonical entities and the\ndirected relations between them that the Parse pipeline populates when\n`linkAcrossDocuments` is enabled.\n\n- **`GET /v3/entities/{id}/relations`** returns the inbound and outbound\n  edges incident to one entity, split by direction. Supports\n  `direction`, an exact `relationType` filter, and cursor pagination over\n  edges. A merged-away entity id transparently resolves to its surviving\n  canonical entity.\n- **`GET /v3/knowledge-graph`** returns the graph as `{ nodes, edges }`,\n  paginating over edges. The `nodes` for a page are the distinct endpoint\n  entities of that page's edges (both endpoints of every edge are\n  included). Filter with `type[]`, `since`, and `search`; an edge is\n  returned only when both of its endpoints survive the entity filters.\n\nBoth endpoints take an optional `bucket` (`bkt_...`) to scope the read to\na single bucket; omit it for the unscoped account+environment view."
paths:
  /v3/entities/{id}/relations:
    get:
      operationId: v3-get-entity-relations
      summary: Get an Entity's Relations
      parameters:
      - name: id
        in: path
        required: true
        description: Entity public ID (`ent_...`). A merged-away id transparently resolves to the surviving entity.
        schema:
          type: string
      - name: direction
        in: query
        required: false
        description: Which edges to return relative to the entity. Defaults to `both`.
        schema:
          type: string
          enum:
          - inbound
          - outbound
          - both
        explode: false
      - name: relationType
        in: query
        required: false
        description: Exact-match filter on the relation label.
        schema:
          type: string
        explode: false
      - name: limit
        in: query
        required: false
        description: Maximum number of edges to return (default 50, max 200).
        schema:
          type: integer
          format: int32
        explode: false
      - name: cursor
        in: query
        required: false
        description: 'Cursor: return edges whose KSUID sorts after this value.'
        schema:
          type: string
        explode: false
      - name: bucket
        in: query
        required: false
        description: 'Optional bucket public ID (`bkt_...`) to scope the read to one bucket.

          Omit for the unscoped (all account+environment) view.'
        schema:
          type: string
        explode: false
      responses:
        '200':
          description: The request has succeeded.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EntityRelationsResponseV3'
      tags:
      - Knowledge Graph
  /v3/knowledge-graph:
    get:
      operationId: v3-get-knowledge-graph
      summary: Retrieve the Knowledge Graph
      parameters:
      - name: nodeID
        in: query
        required: false
        description: 'Center the graph on this entity (`ent_...`) and only return the subgraph

          within `maxDepth` hops of it; every node then carries its `depth` (hops

          from the center, center = 0). Omit for the uncentered whole-graph view.

          `rootNodeID` and `focusNodeID` are accepted as aliases.'
        schema:
          type: string
        explode: false
      - name: maxDepth
        in: query
        required: false
        description: 'Maximum hops from the center node. Only meaningful with `nodeID`. Defaults

          to 2 and is clamped down to a system maximum (5).'
        schema:
          type: integer
          format: int32
        explode: false
      - name: limit
        in: query
        required: false
        description: Maximum number of edges per page (default 50, max 200).
        schema:
          type: integer
          format: int32
        explode: false
      - name: cursor
        in: query
        required: false
        description: 'Cursor: return edges whose KSUID sorts after this value.'
        schema:
          type: string
        explode: false
      - name: type
        in: query
        required: false
        description: 'Restrict to entities of these types. An edge is returned only when BOTH

          of its endpoints survive the type filter.'
        schema:
          type: array
          items:
            type: string
        explode: false
      - name: since
        in: query
        required: false
        description: Only edges created at/after this RFC 3339 timestamp.
        schema:
          type: string
          format: date-time
        explode: false
      - name: search
        in: query
        required: false
        description: 'Case-insensitive substring match on canonical names. Both endpoints of an

          edge must match for the edge (and its nodes) to be returned.'
        schema:
          type: string
        explode: false
      - name: bucket
        in: query
        required: false
        description: 'Optional bucket public ID (`bkt_...`) to scope the read to one bucket.

          Omit for the unscoped (all account+environment) view.'
        schema:
          type: string
        explode: false
      responses:
        '200':
          description: The request has succeeded.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/KnowledgeGraphResponseV3'
      tags:
      - Knowledge Graph
components:
  schemas:
    EntityRelationsResponseV3:
      type: object
      required:
      - inbound
      - outbound
      properties:
        inbound:
          type: array
          items:
            $ref: '#/components/schemas/InboundRelationV3'
          description: Edges pointing at the queried entity.
        outbound:
          type: array
          items:
            $ref: '#/components/schemas/OutboundRelationV3'
          description: Edges pointing away from the queried entity.
        nextCursor:
          type: string
          description: 'Opaque cursor for the next page of edges, or absent on the last page.

            Pass it back as `cursor`.'
      description: Response body for `GET /v3/entities/{id}/relations`.
    GraphEdgeV3:
      type: object
      required:
      - sourceId
      - targetId
      - relationType
      - mentionCount
      properties:
        sourceId:
          type: string
          description: Source entity public id (`ent_...`).
        targetId:
          type: string
          description: Target entity public id (`ent_...`).
        relationType:
          type: string
          description: Free-form relation label.
        mentionCount:
          type: integer
          format: int32
          description: How many times this edge has been observed.
      description: One directed edge between two entities, addressed by their public ids.
    RelatedEntityV3:
      type: object
      required:
      - id
      - canonical
      - type
      - depth
      properties:
        id:
          type: string
          description: Stable public identifier for the entity (`ent_...`).
        canonical:
          type: string
          description: Canonical (most descriptive) surface form of the entity.
        type:
          type: string
          description: Effective entity type.
        depth:
          type: integer
          format: int32
          description: 'Hops from the queried entity. This endpoint returns direct relations, so

            this is 1 (a self-loop''s far end is the queried entity itself, 0).'
      description: 'A compact view of an entity sitting on the far end of a relation edge — the

        stable public id, the canonical name, and the effective type. The full

        entity is fetched separately via the entity detail / File System endpoints.'
    OutboundRelationV3:
      type: object
      required:
      - relationType
      - targetEntity
      - mentionCount
      - firstSeenAt
      properties:
        relationType:
          type: string
          description: Free-form relation label (e.g. `author_of`, `affiliated_with`).
        targetEntity:
          allOf:
          - $ref: '#/components/schemas/RelatedEntityV3'
          description: The entity at the head of the edge.
        mentionCount:
          type: integer
          format: int32
          description: How many times this edge has been observed across parsed documents.
        firstSeenAt:
          type: string
          format: date-time
          description: First-seen timestamp of the edge (RFC 3339).
      description: One edge pointing AWAY from the queried entity (it is the source).
    GraphNodeV3:
      type: object
      required:
      - id
      - canonical
      - type
      - mentionCount
      - depth
      properties:
        id:
          type: string
          description: Stable public identifier for the entity (`ent_...`).
        canonical:
          type: string
          description: Canonical (most descriptive) surface form.
        type:
          type: string
          description: Effective entity type.
        mentionCount:
          type: integer
          format: int32
          description: Total mentions of this entity across all parsed documents.
        depth:
          type: integer
          format: int32
          description: 'Hops from the center node when the request centers the graph on one entity

            (`nodeID`). The center is depth 0. When the request is uncentered (no

            `nodeID`), this is 0 for every node.'
      description: One entity node in the knowledge graph.
    KnowledgeGraphResponseV3:
      type: object
      required:
      - nodes
      - edges
      properties:
        nodes:
          type: array
          items:
            $ref: '#/components/schemas/GraphNodeV3'
          description: Distinct endpoint entities of the returned edge page.
        edges:
          type: array
          items:
            $ref: '#/components/schemas/GraphEdgeV3'
          description: The page of edges.
        nextCursor:
          type: string
          description: 'Opaque cursor for the next page of edges, or absent on the last page.

            Pass it back as `cursor`.'
      description: 'Response body for `GET /v3/knowledge-graph`. Pagination is over edges;

        `nodes` are the distinct endpoint entities of the returned edge page (both

        endpoints of every edge are included).'
    InboundRelationV3:
      type: object
      required:
      - relationType
      - sourceEntity
      - mentionCount
      - firstSeenAt
      properties:
        relationType:
          type: string
          description: Free-form relation label (e.g. `author_of`, `affiliated_with`).
        sourceEntity:
          allOf:
          - $ref: '#/components/schemas/RelatedEntityV3'
          description: The entity at the tail of the edge.
        mentionCount:
          type: integer
          format: int32
          description: How many times this edge has been observed across parsed documents.
        firstSeenAt:
          type: string
          format: date-time
          description: First-seen timestamp of the edge (RFC 3339).
      description: One edge pointing AT the queried entity (some other entity is the source).
  securitySchemes:
    API Key:
      type: apiKey
      in: header
      name: x-api-key
      description: Authenticate using API Key in request header