openapi: 3.1.0
info:
  title: Increase Account Numbers Accounts API
  description: Increase is a bank-grade payments and financial infrastructure platform that exposes a single REST API for moving and holding money in the United States. This document models the primary resources of the Increase API - Accounts, Account Numbers, Cards, Card Payments, ACH / Wire / Real-Time Payments / Check transfers, Transactions, Entities, Events and webhooks, Bookkeeping, Card Profiles and Digital Wallets, Lockboxes, and Simulations. It is grounded in Increase's public OpenAPI 3.1 spec (https://api.increase.com/openapi.json) and the Stainless-generated SDKs. Authentication is a Bearer API key. All endpoints are HTTPS REST; state changes are delivered as Events over HTTP webhooks (no WebSocket surface). Requests support idempotency via the `Idempotency-Key` header. This is a representative, not exhaustive, subset of the full API.
  version: 0.0.1
  contact:
    name: Increase
    url: https://increase.com
  license:
    name: Increase Documentation
    url: https://increase.com/documentation
servers:
- url: https://api.increase.com
  description: Production
- url: https://sandbox.increase.com
  description: Sandbox
security:
- bearerAuth: []
tags:
- name: Accounts
  description: Deposit accounts held at Increase partner banks.
paths:
  /accounts:
    get:
      operationId: listAccounts
      tags:
      - Accounts
      summary: List Accounts
      parameters:
      - $ref: '#/components/parameters/Cursor'
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          $ref: '#/components/responses/AccountList'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createAccount
      tags:
      - Accounts
      summary: Create an Account
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - name
              properties:
                name:
                  type: string
                entity_id:
                  type: string
                program_id:
                  type: string
                informational_entity_id:
                  type: string
      responses:
        '200':
          $ref: '#/components/responses/Account'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /accounts/{account_id}:
    parameters:
    - $ref: '#/components/parameters/AccountId'
    get:
      operationId: retrieveAccount
      tags:
      - Accounts
      summary: Retrieve an Account
      responses:
        '200':
          $ref: '#/components/responses/Account'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateAccount
      tags:
      - Accounts
      summary: Update an Account
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                name:
                  type: string
      responses:
        '200':
          $ref: '#/components/responses/Account'
  /accounts/{account_id}/balance:
    parameters:
    - $ref: '#/components/parameters/AccountId'
    get:
      operationId: retrieveAccountBalance
      tags:
      - Accounts
      summary: Retrieve an Account Balance
      responses:
        '200':
          description: Account balance.
          content:
            application/json:
              schema:
                type: object
                properties:
                  current_balance:
                    type: integer
                  available_balance:
                    type: integer
  /accounts/{account_id}/close:
    parameters:
    - $ref: '#/components/parameters/AccountId'
    post:
      operationId: closeAccount
      tags:
      - Accounts
      summary: Close an Account
      responses:
        '200':
          $ref: '#/components/responses/Account'
components:
  parameters:
    Limit:
      name: limit
      in: query
      required: false
      description: Number of results to return per page (1-100, default 100).
      schema:
        type: integer
        default: 100
        minimum: 1
        maximum: 100
    AccountId:
      name: account_id
      in: path
      required: true
      description: The identifier of the Account.
      schema:
        type: string
    Cursor:
      name: cursor
      in: query
      required: false
      description: Return the page of results starting after this cursor.
      schema:
        type: string
  responses:
    ValidationError:
      description: The request failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    AccountList:
      description: A list of Accounts.
      content:
        application/json:
          schema:
            type: object
            properties:
              data:
                type: array
                items:
                  $ref: '#/components/schemas/Account'
              next_cursor:
                type: string
                nullable: true
    Account:
      description: An Account.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Account'
    NotFound:
      description: The requested object was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Error:
      type: object
      properties:
        type:
          type: string
        title:
          type: string
        detail:
          type: string
          nullable: true
        status:
          type: integer
    Account:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
        entity_id:
          type: string
          nullable: true
        program_id:
          type: string
        currency:
          type: string
          example: USD
        status:
          type: string
          enum:
          - open
          - closed
        bank:
          type: string
        created_at:
          type: string
          format: date-time
        type:
          type: string
          example: account
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Increase API key passed as `Authorization: Bearer YOUR_API_KEY`. Keys are environment-scoped (production vs sandbox). OAuth is also supported for platform / Increase-for-platforms integrations.'