openapi: 3.1.0
info:
  version: 2.0.144
  title: Lichess.org API reference Account Relations API
  contact:
    name: Lichess.org API
    url: https://lichess.org/api
    email: contact@lichess.org
  x-logo:
    url: https://lichess1.org/assets/logo/lichess-pad12.svg
  license:
    name: AGPL-3.0-or-later
    url: https://www.gnu.org/licenses/agpl-3.0.txt
  description: '# Introduction

    Welcome to the reference for the Lichess API! Lichess is free/libre,

    open-source chess server powered by volunteers and donations.

    - Get help in the [Lichess Discord channel](https://discord.gg/lichess)

    - API demo app with OAuth2 login and gameplay: [source](https://github.com/lichess-org/api-demo) / [demo](https://lichess-org.github.io/api-demo/)

    - API UI app with OAuth2 login and endpoint forms: [source](https://github.com/lichess-org/api-ui) / [website](https://lichess.org/api/ui)

    - [Contribute to this documentation on Github](https://github.com/lichess-org/api)

    - Check out [Lichess widgets to embed in your website](https://lichess.org/developers)

    - [Download all Lichess rated games](https://database.lichess.org/)

    - [Download all Lichess puzzles with themes, ratings and votes](https://database.lichess.org/#puzzles)

    - [Download all evaluated positions](https://database.lichess.org/#evals)


    ## Endpoint

    All requests go to `https://lichess.org` (unless otherwise specified).


    ## Clients

    - [Python general API](https://github.com/lichess-org/berserk)

    - [MicroPython general API](https://github.com/mkomon/uberserk)

    - [Python general API - async](https://pypi.org/project/async-lichess-sdk)

    - [Python Lichess Bot](https://github.com/lichess-bot-devs/lichess-bot)

    - [Python Board API for Certabo](https://github.com/haklein/certabo-lichess)

    - [Java general API](https://github.com/tors42/chariot)

    - [JavaScript & TypeScript general API](https://github.com/devjiwonchoi/equine)

    - [LichessNET - C# API Wrapper](https://github.com/Rabergsel/LichessNET)

    - [.NET general API](https://github.com/Dblike/LichessSharp)


    ## Rate limiting

    All requests are rate limited using various strategies,

    to ensure the API remains responsive for everyone.

    Only make one request at a time.

    If you receive an HTTP response with a [429 status](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#429),

    you have exceded one of the rate limits.

    In most cases, waiting one minute before retrying will be sufficient, but some limits may require longer.

    Reduce your request frequency before retrying.


    ## Streaming with ND-JSON

    Some API endpoints stream their responses as [Newline Delimited JSON a.k.a. **nd-json**](https://github.com/ndjson/ndjson-spec), with one JSON object per line.


    Here''s a [JavaScript utility function](https://gist.github.com/ornicar/a097406810939cf7be1df8ea30e94f3e) to help reading NDJSON streamed responses.


    ## Authentication

    ### Which authentication method is right for me?

    [Read about the Lichess API authentication methods and code examples](https://github.com/lichess-org/api/blob/master/example/README.md)


    ### Personal Access Token

    Personal API access tokens allow you to quickly interact with Lichess API without going through an OAuth flow.

    - [Generate a personal access token](https://lichess.org/account/oauth/token)

    - `curl https://lichess.org/api/account -H "Authorization: Bearer {token}"`

    - [NodeJS example](https://github.com/lichess-org/api/tree/master/example/oauth-personal-token)


    ### Token Security

    - Keep your tokens secret. Do not share them in public repositories or public forums.

    - Your tokens can be used to make your account perform arbitrary actions (within the limits of the tokens'' scope). You remain responsible for all activities on your account.

    - Do not hardcode tokens in your application''s code. Use environment variables or a secure storage and ensure they are not shipped/exposed to users. Be especially careful that they are not included in frontend bundles or apps that are shipped to users.

    - If you suspect a token has been compromised, revoke it immediately.


    To see your active tokens or revoke them, see [your Personal API access tokens](https://lichess.org/account/oauth/token).


    ### Authorization Code Flow with PKCE

    The authorization code flow with PKCE allows your users to **login with Lichess**.

    Lichess supports unregistered and public clients (no client authentication, choose any unique client id).

    The only accepted code challenge method is `S256`.

    Access tokens are long-lived (expect one year), unless they are revoked.

    Refresh tokens are not supported.


    See the [documentation for the OAuth endpoints](#tag/OAuth) or

    the [PKCE RFC](https://datatracker.ietf.org/doc/html/rfc7636#section-4) for a precise protocol description.


    - [Demo app](https://lichess-org.github.io/api-demo/)

    - [Minimal client-side example](https://github.com/lichess-org/api/tree/master/example/oauth-app)

    - [Flask/Python example](https://github.com/lakinwecker/lichess-oauth-flask)

    - [Java example](https://github.com/tors42/lichess-oauth-pkce-app)

    - [NodeJS Passport strategy to login with Lichess OAuth2](https://www.npmjs.com/package/passport-lichess)


    #### Real life examples

    - [PyChess](https://github.com/gbtami/pychess-variants) ([source code](https://github.com/gbtami/pychess-variants))

    - [Lichess4545](https://www.lichess4545.com/) ([source code](https://github.com/cyanfish/heltour))

    - [English Chess Federation](https://ecf.octoknight.com/)

    - [Rotherham Online Chess](https://rotherhamonlinechess.azurewebsites.net/tournaments)


    ### Token format

    Access tokens and authorization codes match `^[A-Za-z0-9_]+$`.

    The length of tokens can be increased without notice. Make sure your application can handle at least 512 characters.

    By convention tokens have a recognizable prefix, but do not rely on this.

    '
servers:
- url: https://lichess.org
- url: https://lichess.dev
- url: http://localhost:{port}
  variables:
    port:
      default: '8080'
- url: http://l.org
tags:
- name: Relations
  description: 'Access relations between users.

    '
paths:
  /api/rel/following:
    get:
      operationId: apiUserFollowing
      summary: Get users followed by the logged in user
      description: 'Users are streamed as [ndjson](#description/streaming-with-nd-json).

        '
      tags:
      - Relations
      security:
      - OAuth2:
        - follow:read
      responses:
        '200':
          description: The list of users followed by a user.
          headers:
            Access-Control-Allow-Origin:
              schema:
                type: string
                default: '''*'''
          content:
            application/x-ndjson:
              schema:
                $ref: '#/components/schemas/UserExtended'
              examples:
                default:
                  $ref: '#/components/examples/relations-getMyFollowing.json'
  /api/rel/follow/{username}:
    post:
      operationId: followUser
      summary: Follow a player
      description: 'Follow a player, adding them to your list of Lichess friends.

        '
      tags:
      - Relations
      security:
      - OAuth2:
        - follow:write
      parameters:
      - in: path
        name: username
        schema:
          type: string
          example: thibault
        required: true
      responses:
        '200':
          description: The player was successfully added.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Ok'
              examples:
                default:
                  $ref: '#/components/examples/relations-followPlayer.json'
  /api/rel/unfollow/{username}:
    post:
      operationId: unfollowUser
      summary: Unfollow a player
      description: 'Unfollow a player, removing them from your list of Lichess friends.

        '
      tags:
      - Relations
      security:
      - OAuth2:
        - follow:write
      parameters:
      - in: path
        name: username
        schema:
          type: string
          example: thibault
        required: true
      responses:
        '200':
          description: The player was successfully removed.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Ok'
              examples:
                default:
                  $ref: '#/components/examples/relations-unfollowPlayer.json'
  /api/rel/block/{username}:
    post:
      operationId: blockUser
      summary: Block a player
      description: 'Block a player, adding them to your list of blocked Lichess users.

        '
      tags:
      - Relations
      security:
      - OAuth2:
        - follow:write
      parameters:
      - in: path
        name: username
        schema:
          type: string
          example: thibault
        required: true
      responses:
        '200':
          description: The player was successfully added.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Ok'
              examples:
                default:
                  $ref: '#/components/examples/relations-blockPlayer.json'
  /api/rel/unblock/{username}:
    post:
      operationId: unblockUser
      summary: Unblock a player
      description: 'Unblock a player, removing them from your list of blocked Lichess users.

        '
      tags:
      - Relations
      security:
      - OAuth2:
        - follow:write
      parameters:
      - in: path
        name: username
        schema:
          type: string
          example: thibault
        required: true
      responses:
        '200':
          description: The player was successfully removed.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Ok'
              examples:
                default:
                  $ref: '#/components/examples/relations-unblockPlayer.json'
components:
  schemas:
    PuzzleModePerf:
      type: object
      properties:
        runs:
          type: integer
        score:
          type: integer
      required:
      - runs
      - score
    PatronColor:
      type: integer
      description: 'Players can choose a color for their Patron wings.

        See [here for the color mappings](https://github.com/lichess-org/lila/blob/master/ui/lib/css/abstract/_patron-colors.scss).


        The presence of this field indicates the player is an active Patron.

        '
      minimum: 1
      maximum: 10
    PlayTime:
      type: object
      properties:
        total:
          type: integer
        tv:
          type: integer
        human:
          type: integer
      required:
      - total
      - tv
    Patron:
      type: boolean
      deprecated: true
      description: 'Use patronColor value instead to determine if player is a patron.

        '
    Count:
      type: object
      properties:
        all:
          type: integer
        rated:
          type: integer
        ai:
          type: integer
        draw:
          type: integer
        drawH:
          type: integer
        loss:
          type: integer
        lossH:
          type: integer
        win:
          type: integer
        winH:
          type: integer
        bookmark:
          type: integer
        playing:
          type: integer
        import:
          type: integer
        me:
          type: integer
      required:
      - all
      - rated
      - draw
      - loss
      - win
      - bookmark
      - playing
      - import
      - me
    UserExtended:
      allOf:
      - $ref: '#/components/schemas/User'
      - type: object
        properties:
          url:
            type: string
            format: uri
          playing:
            type: string
            format: uri
          count:
            $ref: '#/components/schemas/Count'
          streaming:
            type: boolean
          streamer:
            $ref: '#/components/schemas/UserStreamer'
          followable:
            type: boolean
            description: only appears if the request is [authenticated with OAuth2](#description/authentication)
          following:
            type: boolean
            description: only appears if the request is [authenticated with OAuth2](#description/authentication)
          blocking:
            type: boolean
            description: only appears if the request is [authenticated with OAuth2](#description/authentication)
          fideId:
            type: number
        required:
        - url
    UserStreamer:
      type: object
      properties:
        twitch:
          type: object
          properties:
            channel:
              type: string
              format: uri
              example: https://www.twitch.tv/lichessdotorg
        youtube:
          type: object
          properties:
            channel:
              type: string
              format: uri
              example: https://www.youtube.com/c/LichessDotOrg
    Ok:
      properties:
        ok:
          type: boolean
      required:
      - ok
    Profile:
      type: object
      properties:
        flag:
          type: string
          example: EC
        location:
          type: string
        bio:
          type: string
          example: Free bugs!
        realName:
          type: string
          example: Thibault Duplessis
        fideRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        uscfRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        ecfRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        cfcRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        rcfRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        dsbRating:
          type: integer
          example: 1500
          description: only appears if a user has set them
        links:
          type: string
          example: "github.com/ornicar\r\nmas.to/@thibault"
    Flair:
      type: string
      description: See [available flair list and images](https://github.com/lichess-org/lila/tree/master/public/flair)
    Perf:
      type: object
      properties:
        games:
          type: integer
        rating:
          type: integer
        rd:
          type: integer
          description: rating deviation
        prog:
          type: integer
        prov:
          type: boolean
          description: only appears if a user's perf rating are [provisional](https://lichess.org/faq#provisional)
        rank:
          type: integer
          description: global lichess ranking, only appears for recently active players
      required:
      - games
      - rating
      - rd
      - prog
    User:
      type: object
      properties:
        id:
          type: string
        username:
          type: string
        perfs:
          $ref: '#/components/schemas/Perfs'
        title:
          $ref: '#/components/schemas/Title'
        flair:
          $ref: '#/components/schemas/Flair'
        createdAt:
          type: integer
          format: int64
        disabled:
          type: boolean
          description: only appears if a user's account is closed
        tosViolation:
          type: boolean
          description: only appears if a user's account is marked for the violation of [Lichess TOS](https://lichess.org/terms-of-service)
        profile:
          $ref: '#/components/schemas/Profile'
        seenAt:
          type: integer
          format: int64
        playTime:
          $ref: '#/components/schemas/PlayTime'
        patron:
          $ref: '#/components/schemas/Patron'
        patronColor:
          $ref: '#/components/schemas/PatronColor'
        verified:
          type: boolean
      required:
      - id
      - username
    Perfs:
      type: object
      properties:
        chess960:
          $ref: '#/components/schemas/Perf'
        atomic:
          $ref: '#/components/schemas/Perf'
        racingKings:
          $ref: '#/components/schemas/Perf'
        ultraBullet:
          $ref: '#/components/schemas/Perf'
        blitz:
          $ref: '#/components/schemas/Perf'
        kingOfTheHill:
          $ref: '#/components/schemas/Perf'
        threeCheck:
          $ref: '#/components/schemas/Perf'
        antichess:
          $ref: '#/components/schemas/Perf'
        crazyhouse:
          $ref: '#/components/schemas/Perf'
        bullet:
          $ref: '#/components/schemas/Perf'
        correspondence:
          $ref: '#/components/schemas/Perf'
        horde:
          $ref: '#/components/schemas/Perf'
        puzzle:
          $ref: '#/components/schemas/Perf'
        classical:
          $ref: '#/components/schemas/Perf'
        rapid:
          $ref: '#/components/schemas/Perf'
        storm:
          $ref: '#/components/schemas/PuzzleModePerf'
        racer:
          $ref: '#/components/schemas/PuzzleModePerf'
        streak:
          $ref: '#/components/schemas/PuzzleModePerf'
    Title:
      type: string
      enum:
      - GM
      - WGM
      - IM
      - WIM
      - FM
      - WFM
      - NM
      - CM
      - WCM
      - WNM
      - LM
      - BOT
      description: only appears if the user is a titled player or a bot user
  examples:
    relations-getMyFollowing.json:
      value:
        id: angel
        username: Angel
        perfs:
          bullet:
            games: 69
            rating: 2223
            rd: 47
            prog: -40
          blitz:
            games: 571
            rating: 2204
            rd: 76
            prog: 51
          rapid:
            games: 279
            rating: 2245
            rd: 46
            prog: -3
          classical:
            games: 36
            rating: 2366
            rd: 49
            prog: -43
          correspondence:
            games: 329
            rating: 2248
            rd: 114
            prog: -18
            prov: true
          chess960:
            games: 65
            rating: 2199
            rd: 45
            prog: 2
          kingOfTheHill:
            games: 2917
            rating: 2306
            rd: 64
            prog: -12
          threeCheck:
            games: 136
            rating: 2311
            rd: 45
            prog: -3
          antichess:
            games: 190
            rating: 2255
            rd: 79
            prog: 4
          atomic:
            games: 544
            rating: 2424
            rd: 100
            prog: 42
          horde:
            games: 50
            rating: 2345
            rd: 55
            prog: 52
          crazyhouse:
            games: 1717
            rating: 2286
            rd: 111
            prog: 5
            prov: true
          puzzle:
            games: 485
            rating: 2338
            rd: 58
            prog: -6
        title: CM
        flair: people.person-in-motorized-wheelchair-facing-right-medium-light-skin-tone
        patron: true
        patronColor: 1
        createdAt: 1774542084429
        seenAt: 1777308613557
        playTime:
          total: 15563
          tv: 0
        url: https://lichess.org/@/Angel
    relations-unfollowPlayer.json:
      value:
        ok: true
    relations-unblockPlayer.json:
      value:
        ok: true
    relations-followPlayer.json:
      value:
        ok: true
    relations-blockPlayer.json:
      value:
        ok: true
  securitySchemes:
    OAuth2:
      type: oauth2
      description: 'Read [the introduction for how to make authenticated requests](#description/authentication).

        '
      flows:
        authorizationCode:
          authorizationUrl: https://lichess.org/oauth
          tokenUrl: https://lichess.org/api/token
          scopes:
            preference:read: Read your preferences
            preference:write: Write your preferences
            email:read: Read your email address
            engine:read: Read your external engines
            engine:write: Create, update, delete your external engines
            challenge:read: Read incoming challenges
            challenge:write: Create, accept, decline challenges
            challenge:bulk: Create, delete, query bulk pairings
            study:read: Read private studies and broadcasts
            study:write: Create, update, delete studies and broadcasts
            tournament:write: Create tournaments
            racer:write: Create and join puzzle races
            puzzle:read: Read puzzle activity
            puzzle:write: Write puzzle activity
            team:read: Read private team information
            team:write: Join, leave teams
            team:lead: Manage teams (kick members, send PMs)
            follow:read: Read followed players
            follow:write: Follow and unfollow other players
            msg:write: Send private messages to other players
            board:play: Play with the Board API
            bot:play: Play with the Bot API. Only for [Bot accounts](#tag/bot/POST/api/bot/account/upgrade)
            web:mod: Use moderator tools (within the bounds of your permissions)