openapi: 3.1.0
info:
  title: Farcaster Snapchain Hub HTTP Casts Links API
  description: HTTP query interface for Farcaster's Snapchain network. Read casts, reactions, follows, user data, verifications and on-chain events by FID; submit signed protobuf messages; and stream hub events. The public reference endpoint is hosted at https://snapchain.farcaster.xyz, but operators typically run their own Snapchain node and bind the HTTP server to a local port (default 3381).
  version: 1.0.0
  contact:
    name: Farcaster
    url: https://snapchain.farcaster.xyz/
  license:
    name: MIT
servers:
- url: https://snapchain.farcaster.xyz
  description: Public Snapchain reference endpoint
- url: http://127.0.0.1:3381
  description: Default local Snapchain HTTP server
tags:
- name: Links
paths:
  /v1/linkById:
    get:
      tags:
      - Links
      summary: Get a link (follow) by FID and target
      parameters:
      - $ref: '#/components/parameters/Fid'
      - in: query
        name: target_fid
        required: true
        schema:
          type: integer
      - in: query
        name: link_type
        schema:
          type: string
      responses:
        '200':
          description: Link message
  /v1/linksByFid:
    get:
      tags:
      - Links
      summary: List links authored by a FID
      parameters:
      - $ref: '#/components/parameters/Fid'
      - in: query
        name: link_type
        schema:
          type: string
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Reverse'
      responses:
        '200':
          description: Page of links
  /v1/linksByTargetFid:
    get:
      tags:
      - Links
      summary: List links targeting a FID
      parameters:
      - in: query
        name: target_fid
        required: true
        schema:
          type: integer
      - in: query
        name: link_type
        schema:
          type: string
      - $ref: '#/components/parameters/PageSize'
      - $ref: '#/components/parameters/PageToken'
      - $ref: '#/components/parameters/Reverse'
      responses:
        '200':
          description: Page of links
components:
  parameters:
    Reverse:
      in: query
      name: reverse
      schema:
        type: boolean
    PageToken:
      in: query
      name: pageToken
      schema:
        type: string
    PageSize:
      in: query
      name: pageSize
      schema:
        type: integer
    Fid:
      in: query
      name: fid
      required: true
      schema:
        type: integer
      description: Farcaster ID