> ## Documentation Index
> Fetch the complete documentation index at: https://docs.3ngram.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Currently-valid facts, with optional bi-temporal time travel (mirrors the MCP get_facts tool)



## OpenAPI

````yaml /api-reference/openapi.json get /api/v1/facts
openapi: 3.1.0
info:
  description: >-
    The /api/v1 REST mirror of the 3ngram memory core
    (docs/concepts/architecture.mdx: one core, N transports). Authenticate with
    an X-API-Key header or a session Bearer token.
  title: 3ngram REST API
  version: v1
servers:
  - description: 3ngram platform
    url: https://api.3ngram.ai
security:
  - apiKey: []
  - sessionBearer: []
paths:
  /api/v1/facts:
    get:
      summary: >-
        Currently-valid facts, with optional bi-temporal time travel (mirrors
        the MCP get_facts tool)
      operationId: getFacts
      parameters:
        - in: query
          name: subject
          required: false
          schema:
            minLength: 1
            type: string
        - in: query
          name: predicate
          required: false
          schema:
            minLength: 1
            type: string
        - in: query
          name: limit
          required: false
          schema:
            default: 50
            maximum: 200
            minimum: 1
            type: integer
        - in: query
          name: validAt
          required: false
          schema:
            format: date-time
            pattern: >-
              ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$
            type: string
        - in: query
          name: asKnownAt
          required: false
          schema:
            format: date-time
            pattern: >-
              ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$
            type: string
      responses:
        '200':
          content:
            application/json:
              schema:
                additionalProperties: false
                properties:
                  count:
                    maximum: 9007199254740991
                    minimum: 0
                    type: integer
                  facts:
                    items:
                      additionalProperties: false
                      properties:
                        confidence:
                          anyOf:
                            - type: number
                            - type: 'null'
                        id:
                          format: uuid
                          pattern: >-
                            ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$
                          type: string
                        predicate:
                          type: string
                        subject:
                          type: string
                        validFrom:
                          format: date-time
                          pattern: >-
                            ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$
                          type: string
                        validTo:
                          anyOf:
                            - format: date-time
                              pattern: >-
                                ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$
                              type: string
                            - type: 'null'
                        value:
                          type: string
                      required:
                        - id
                        - subject
                        - predicate
                        - value
                        - confidence
                        - validFrom
                        - validTo
                      type: object
                    type: array
                required:
                  - facts
                  - count
                type: object
          description: Success
components:
  securitySchemes:
    apiKey:
      in: header
      name: X-API-Key
      type: apiKey
    sessionBearer:
      scheme: bearer
      type: http

````