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Full detail: Where this data comes from
Middesk is a business identity and verification platform providing API-first infrastructure for KYB (Know Your Business) compliance, EIN/TIN validation, business registration verification, UBO and officer research, sanctions screening, and ongoing business monitoring. Used by fintechs, lenders, banks, and marketplaces to automate customer onboarding and compliance workflows.
Website: https://www.middesk.com Developer Docs: https://docs.middesk.com API Reference: https://docs.middesk.com/reference Status: https://status.middesk.com Blog: https://www.middesk.com/blog GitHub: https://github.com/middesk LinkedIn: https://www.linkedin.com/company/middesk X: https://x.com/middeskhq
Middesk exposes a REST API with JSON responses over HTTPS. Two environments are available:
- Production:
https://api.middesk.com/v1/ - Sandbox:
https://api-sandbox.middesk.com/v1/
Authentication uses HTTP Basic Auth or Bearer token with API keys (prefixed mk_live for production, mk_test for sandbox). Keys are managed in the Middesk Dashboard under Settings > Developer > Credentials.
- Business verification (KYB) — Secretary of State registration, EIN/TIN validation, address verification
- Owner and officer verification
- Sanctions and OFAC screening
- Adverse media and PEP screening
- Web presence and industry analysis
- Ongoing business monitoring with webhook notifications
- Lien search and management
- Entity management for payroll tax registration
- Business autocomplete and smart populate (prefill)
- Agentic compliance workflows
apis.yml— APIs.json 0.19 provider profileplans/middesk-plans-pricing.yml— Pricing plans and tiersrate-limits/middesk-rate-limits.yml— Rate limiting and authentication detailsfinops/middesk-finops.yml— FinOps guidance and cost optimization strategies