Blend

Blend Documents & Disclosures API

Documents, disclosures, tax transcripts, and loan file export.

Documentation GitHub OpenAPI

OpenAPI Specification

openapi: 3.0.3
info:
  title: Blend Public Borrowers & Parties Documents & Disclosures 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: Documents & Disclosures
  description: Documents, disclosures, tax transcripts, and loan file export.
paths:
  /home-lending/applications/{id}/file-export:
    parameters:
    - $ref: '#/components/parameters/ApplicationId'
    get:
      operationId: exportApplicationFile
      tags:
      - Documents & Disclosures
      summary: Export the loan application file
      description: Exports the industry-standard loan application file in the requested format for import into an LOS.
      parameters:
      - name: format
        in: query
        required: true
        schema:
          type: string
          enum:
          - FANNIE_MAE_3_2
          - MISMO_3_3_1
          - MISMO_3_4
        description: The export format (Fannie Mae 3.2, MISMO 3.3.1, or MISMO 3.4 beta).
      responses:
        '200':
          description: The exported loan file.
          content:
            application/xml: {}
            application/json: {}
        '404':
          $ref: '#/components/responses/NotFound'
  /home-lending/applications/export-statuses:
    get:
      operationId: getExportStatuses
      tags:
      - Documents & Disclosures
      summary: Get application export statuses
      parameters:
      - name: ids
        in: query
        schema:
          type: string
        description: Comma-separated application IDs.
      responses:
        '200':
          description: Export statuses for the requested applications.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/ExportStatus'
  /home-lending/applications/{id}/export-status:
    parameters:
    - $ref: '#/components/parameters/ApplicationId'
    post:
      operationId: setExportStatus
      tags:
      - Documents & Disclosures
      summary: Update application export status
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - status
              properties:
                status:
                  type: string
                  enum:
                  - IN_PROGRESS
                  - SUCCESS
                  - FAILED
                reason:
                  type: string
      responses:
        '200':
          description: The updated export status.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExportStatus'
  /applications/{id}/documents:
    parameters:
    - $ref: '#/components/parameters/ApplicationId'
    get:
      operationId: getApplicationDocuments
      tags:
      - Documents & Disclosures
      summary: Get application documents
      responses:
        '200':
          description: Documents attached to the application.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Document'
  /documents:
    post:
      operationId: uploadDocument
      tags:
      - Documents & Disclosures
      summary: Upload a document
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
      responses:
        '201':
          description: The uploaded document.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Document'
    get:
      operationId: getDocuments
      tags:
      - Documents & Disclosures
      summary: List documents
      responses:
        '200':
          description: A list of documents.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Document'
  /documents/{documentId}:
    parameters:
    - $ref: '#/components/parameters/DocumentId'
    get:
      operationId: getDocument
      tags:
      - Documents & Disclosures
      summary: Get a document
      responses:
        '200':
          description: The document (binary or metadata reference).
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: patchDocument
      tags:
      - Documents & Disclosures
      summary: Update document data
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
      responses:
        '200':
          description: The updated document.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Document'
  /documents/{documentId}/metadata:
    parameters:
    - $ref: '#/components/parameters/DocumentId'
    get:
      operationId: getDocumentMetadata
      tags:
      - Documents & Disclosures
      summary: Get document metadata
      responses:
        '200':
          description: Document metadata.
components:
  responses:
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    ApplicationId:
      name: id
      in: path
      required: true
      schema:
        type: string
      description: The application ID.
    DocumentId:
      name: documentId
      in: path
      required: true
      schema:
        type: string
      description: The document ID.
  schemas:
    ExportStatus:
      type: object
      properties:
        applicationId:
          type: string
        status:
          type: string
          enum:
          - IN_PROGRESS
          - SUCCESS
          - FAILED
        reason:
          type: string
    Document:
      type: object
      properties:
        id:
          type: string
        type:
          type: string
        name:
          type: string
        status:
          type: string
    Error:
      type: object
      properties:
        error:
          type: string
        message:
          type: string
  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.

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