For AI agents: a documentation index is available at the root level at /llms.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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HomeGuidesAPI reference
  • Get started
    • Quickstart—Verify a Business
    • Quickstart—Register an entity for payroll taxes
    • Learn how Middesk works
    • Security
    • Changelog
  • Build with Middesk
    • Get your API keys
    • Understand API changes
    • Status codes and errors reference
    • Implement webhooks
    • Secure webhooks
    • Use GraphQL
    • Connect MCP
  • Verify a business (KYB)
    • Verify TIN
    • Verify name and address
    • Verify Secretary of State status
    • Verify owners and officers
    • Screen for sanctions and watchlists
    • Search for adverse media
    • Search for Politically Exposed Persons
    • Implement KYC
    • Discover connections
    • Evaluate online presence
    • Assess credit risk
    • Accelerate onboarding
    • Monitor business activity
    • Manage business entities
    • Work with agents
  • Quickstart—Verify a Business
  • Quickstart—Register an entity for payroll taxes
  • Learn how Middesk works
  • Lifecycle of a Business
  • How Middesk matches data
  • Review insights
  • Use rulesets or policies
  • Create orders
  • Use the sandbox and production environments
  • Use the enhanced sandbox
  • Security
  • Use single sign-on (SSO)
  • Enable directory sync
  • Security certifications, frameworks, and principles
  • Changelog
  • April 27, 2026
  • March 5, 2026
  • February 18, 2026
  • December 18, 2025
  • December 4, 2025
  • Build with Middesk
  • Get your API keys
  • Understand API changes
  • Status codes and errors reference
  • Implement webhooks
  • Secure webhooks
  • Use GraphQL
  • Connect MCP
  • Verify a business (KYB)
  • Verify TIN
  • Monitor TINs for newly formed businesses
  • TIN review tasks
  • Verify name and address
  • Name and address review tasks
  • Verify Secretary of State status
  • Secretary of State review tasks
  • Verify owners and officers
  • People review tasks
  • Screen for sanctions and watchlists
  • Search for adverse media
  • Search for Politically Exposed Persons
  • Implement KYC
  • Discover connections
  • Evaluate online presence
  • Analyze web presence
  • Web analysis review tasks
  • Verify business industry classification
  • Classification object
  • Prohibited categories
  • Industry classification review tasks
  • Evaluate email risk
  • Email risk review tasks
  • Assess credit risk
  • Search for liens
  • File and terminate a lien
  • Research legal records
  • Accelerate onboarding
  • How Signal works
  • Score a business profile
  • Reason codes
  • Integrate the Autocomplete API
  • Integrate the Smart Populate API
  • Create a Business Enrichment order
  • Monitor business activity
  • How Monitoring works
  • Monitor business names
  • Monitor people
  • Monitor status
  • Monitor watchlist hits
  • Monitor bankruptcies
  • Monitor liens
  • Retrieve the business timeline
  • Webhook events
  • Manage business entities
  • Learn the registration lifecycle
  • Register an entity for payroll taxes
  • Configure webhooks for entity management
  • Invite employers
  • Registration items labels and keys
  • Optional parameters for registration requests
  • Tax registration items
  • Jurisdiction registration status
  • Partner integration endpoints
  • Sandbox guide
  • Work with agents
  • Run agents
  • Stream run events
  • Take action
  • Interrupt policy
  • Webhook events
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Changelog

April 27

April 27, 2026

API Deprecated: orders[].package field The orders[].package field is deprecated in favor of orders[].product. Requests that include orders[].package will continue to work but will return a…

March 5

March 5, 2026

Dashboard Enhanced Sandbox Preview New enhanced sandbox mode available in Technology Preview. Define custom test businesses and use pre-built scenario templates to simulate specific verification…

February 18

February 18, 2026

Agents Agents API New API to retrieve specific agent details or a list of available agents on your account. Each agent has a defined type and set of capabilities for resolving business verification…

December 18

December 18, 2025

Onboarding Autocomplete API New Autocomplete API returns real-time, structured business suggestions based on partial name input—including names, addresses, people, and entity type. Integrate directly…

December 4

December 4, 2025

API GraphQL Preview New GraphQL API available in Technology Preview. Query business verification data with nested relationships in a single request, reducing typical workflows from 3-5 sequential…

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