# Proof of Good Standing - llms.txt > Professional business entity research and state database access platform. ## Site - Canonical: https://www.proofofgoodstanding.com/ - Purpose: access all 50 state SOS business entity and UCC filing portals ## Priority Pages - https://www.proofofgoodstanding.com/business-lookup - https://www.proofofgoodstanding.com/states - https://www.proofofgoodstanding.com/learn - https://www.proofofgoodstanding.com/tools - https://www.proofofgoodstanding.com/chrome - https://www.proofofgoodstanding.com/industries ## Key Tool Pages - https://www.proofofgoodstanding.com/tools/sales-tax-calculator - https://www.proofofgoodstanding.com/tools/registered-agent-requirements - https://www.proofofgoodstanding.com/tools/business-formation-calculator - https://www.proofofgoodstanding.com/tools/business-lending-calculator - https://www.proofofgoodstanding.com/tools/email-signature ## Important Learn Guides - https://www.proofofgoodstanding.com/learn/how-to-search-business-entities - https://www.proofofgoodstanding.com/learn/what-is-sos-business-search - https://www.proofofgoodstanding.com/learn/understanding-ucc-filings-in-detail - https://www.proofofgoodstanding.com/learn/state-by-state-search-requirements - https://www.proofofgoodstanding.com/learn/ucc-filing-search-faq ## Discovery Files - robots: https://www.proofofgoodstanding.com/robots.txt - sitemap: https://www.proofofgoodstanding.com/sitemap.xml - llm short alias: https://www.proofofgoodstanding.com/llm.txt - llm extended index: https://www.proofofgoodstanding.com/llms-full.txt ## Governance - Contact: https://www.proofofgoodstanding.com/contact - Legal: https://www.proofofgoodstanding.com/legal