# Federal Hierarchy API The SAM.gov Federal Hierarchy Public API gives non-federal users 10 requests a day and returns at most 100 organizations per page. Office trees are easier to build from the department, sub-tier, office and AAC columns in opportunity and award data. Every opportunity notice carries Department/Ind. Agency, Sub-Tier, Office and AAC code; every award carries awarding agency, sub-agency and office.Checked on 2026-11-12.Official source: [open.gsa.gov Federal Hierarchy API](https://open.gsa.gov/api/fh-public-api/) | Non-federal limit | 10 a day | | --- | --- | | Federal limit | 1,000 a day | | Page size | Up to 100 | | Active sub-tiers in the doc example | 1,021 | ## Building offices without it Every opportunity notice carries Department/Ind. Agency, Sub-Tier, Office and AAC code; every award carries awarding agency, sub-agency and office. Together they cover the offices that actually buy. ## Related - [SAM.gov API rate limits](https://samgovapi.io/sam-gov-api-rate-limits)Updated 2026-11-12. Sources checked 2026-11-12.Independent. Not affiliated with, endorsed by or sponsored by GSA, SAM.gov or any U.S. government agency. Registering in SAM.gov is free at sam.gov.

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