openapi: 3.0.3
info:
  title: Blend Public Borrowers & Parties Consumer Lending & Deposit API
  description: 'The Blend Public API is the documented REST surface of the Blend Labs digital lending and account-opening platform (developers.blend.com). It lets lenders and certified technology partners programmatically create and manage lending applications across home lending (mortgage), consumer lending, and deposit account opening; manage borrowers/parties, documents and disclosures, pricing, closings and eSignature packages, follow-ups (tasks), lenders and assignments; subscribe to webhook event notifications; and export industry-standard loan files (Fannie Mae 3.2, MISMO 3.3.1/3.4) into a loan origination system (LOS).


    endpointsModeled: The paths, methods, and resource names in this document are modeled from Blend''s public developer documentation and reference at developers.blend.com (llms.txt endpoint index, Quick Start Guide, LOS Guide, and the create/export home-loan guides). Blend does not publish a fully open self-service OpenAPI - the reference is credential-gated and access tokens are issued to Blend customers and certified partners. Request/response schemas below are representative rather than field-complete; obtain the authoritative machine spec at https://developers.blend.com/blend/openapi once you hold API credentials.'
  version: 12.0.0
  contact:
    name: Blend Labs
    url: https://developers.blend.com/blend
  termsOfService: https://blend.com/legal/terms-of-service/
servers:
- url: https://api.blendlabs.com
  description: Production
- url: https://api.beta.blendlabs.com
  description: Beta / integration environment (used in Blend's documentation examples)
security:
- bearerAuth: []
tags:
- name: Consumer Lending & Deposit
  description: Consumer lending, account opening, and deposit account applications.
paths:
  /consumer-lending/applications/{id}:
    parameters:
    - $ref: '#/components/parameters/ApplicationId'
    get:
      operationId: getConsumerLendingApplication
      tags:
      - Consumer Lending & Deposit
      summary: Get a consumer lending application
      responses:
        '200':
          description: The consumer lending application.
    patch:
      operationId: patchConsumerLendingApplication
      tags:
      - Consumer Lending & Deposit
      summary: Update a consumer lending application
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: The updated consumer lending application.
  /account-opening/applications/{id}:
    parameters:
    - $ref: '#/components/parameters/ApplicationId'
    get:
      operationId: getAccountOpeningApplication
      tags:
      - Consumer Lending & Deposit
      summary: Get an account opening application
      responses:
        '200':
          description: The account opening application.
  /deposit-accounts/applications:
    get:
      operationId: listDepositAccountApplications
      tags:
      - Consumer Lending & Deposit
      summary: List deposit account applications
      responses:
        '200':
          description: A list of deposit account applications.
  /deposit-accounts/products:
    get:
      operationId: listDepositAccountProducts
      tags:
      - Consumer Lending & Deposit
      summary: List deposit account products
      responses:
        '200':
          description: A list of deposit account products.
components:
  parameters:
    ApplicationId:
      name: id
      in: path
      required: true
      schema:
        type: string
      description: The application ID.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: Blend authenticates requests with an authorization Bearer token. Each call must also send blend-api-version (to pin the API version) and blend-target-instance (tenant~instance) headers. API Secret Keys are exchanged for short-lived, request-scoped JWTs at Blend's API Gateway. Credentials are issued to Blend customers and certified partners - contact your Blend account team or partnerships to obtain them.