Manifold Authorization Code Grant API

openapi: 3.2.0
info:
  title: Manifold OAuth2 Authentication Authorization Code Grant API
  description: 'Server-side session authentication API for validating wallet addresses of authenticated Manifold clients. Supports two grant types: Signature Grant (POST /verify to confirm a wallet signature session token) and Authorization Code Grant (POST /token to exchange a one-time code for a 30-day access token). Enables backends to securely access and modify private user data without exposing session keys client-side. Requires a Developer App configured at the Manifold Developer Portal.'
  version: 1.0.0
  contact:
    name: Manifold
    url: https://manifold.xyz
  license:
    name: MIT
servers:
- url: https://oauth2.manifoldxyz.dev
  description: Manifold OAuth2 Authentication Server
tags:
- name: Authorization Code Grant
  description: Exchange a one-time authorization code for a long-lived access token allowing server-side access to private user data.
paths:
  /token:
    post:
      operationId: exchangeAuthorizationCode
      summary: Exchange an authorization code for an access token
      description: Exchanges a one-time authorization code (obtained after a user completes the Manifold OAuth2 flow) for a 30-day access token. The access token can then be used server-side to read and modify private user data. Requires credentials from a Developer App configured at the Manifold Developer Portal.
      tags:
      - Authorization Code Grant
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TokenRequest'
            example:
              clientId: my-app-client-id
              code: one-time-authorization-code
              clientSecret: my-app-client-secret
              signature: 0xsignature...
      responses:
        '200':
          description: Authorization code accepted; access token returned.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TokenResponse'
              example:
                access_token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...
                expires_in: 2592000
        '400':
          description: Invalid request parameters.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Invalid client credentials or signature.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '403':
          description: Authorization code already used or expired.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    TokenResponse:
      type: object
      properties:
        access_token:
          type: string
          description: A 30-day access token for server-side access to private user data.
        expires_in:
          type: integer
          description: Token lifetime in seconds (typically 2592000 for 30 days).
          example: 2592000
    ErrorResponse:
      type: object
      properties:
        error:
          type: string
          description: Machine-readable error code.
        error_description:
          type: string
          description: Human-readable description of the error.
    TokenRequest:
      type: object
      required:
      - clientId
      - code
      - clientSecret
      - signature
      properties:
        clientId:
          type: string
          description: The client ID for your Developer App, obtained from the Manifold Developer Portal.
        code:
          type: string
          description: The one-time authorization code received after the user completes the OAuth2 authorization flow.
        clientSecret:
          type: string
          description: The client secret for your Developer App, obtained from the Manifold Developer Portal.
        signature:
          type: string
          description: A cryptographic signature used to authenticate the token exchange request.