API Reference¶

These pages are a curated reference for filtering, ordering, and pagination on Tango’s highest-traffic endpoints, with copy/pasteable examples (including SDK usage).

Swagger is still the canonical surface-area reference, but these pages aim to be faster to use day-to-day.

• Swagger (OpenAPI): https://tango.makegov.com/api/
• For field definitions, see the Data Dictionary.

Awards¶

Definitive contracts, indefinite-delivery vehicles, other transactions, subawards, and solicitation-level groupings.

• Contracts — Definitive contract awards (materialized from FPDS and USAspending inputs).
• IDVs — Indefinite delivery vehicles (GWACs, IDIQs, etc.; materialized from FPDS and USAspending inputs); multiple orders can be issued against an IDV.
• OTAs — Other Transaction Agreements from FPDS (non-standard procurement instruments).
• OTIDVs — Other Transaction IDVs from FPDS (indefinite-delivery OT vehicles).
• Subawards — Sub-contracts and sub-grants under prime awards; sourced from USAspending/FSRS.
• Vehicles — Solicitation-centric grouping of IDVs (the “one solicitation, many awardees” view).
• GSA eLibrary contracts — Persisted GSA eLibrary contract metadata (direct endpoint).

Entities¶

• Entities — Vendors and recipients in federal contracting and assistance; UEI is the canonical identifier (from SAM.gov).

Forecasts¶

• Forecasts — Upcoming procurement opportunities from agency feeds (e.g., HHS, DHS) before they appear as SAM.gov solicitations.

Grants¶

• Grants — Grant opportunities from Grants.gov (funding opportunities, not assistance transactions).

Opportunities¶

SAM.gov contract opportunity and notice data.

• Opportunities — Contract opportunities aggregated by parent (one opportunity can have multiple notices over time).
• Notices — Individual SAM.gov notice records (amendments, updates) under an opportunity.

Organizations¶

Federal hierarchy: departments, agencies, and offices. Organizations is the unified tree; agencies, departments, and offices are filtered views.

• Agencies — Federal agencies (sub-organizations under departments).
• Departments — Top-level federal departments.
• Offices — Sub-agency offices in the federal hierarchy.
• Organizations — Unified federal hierarchy (departments, agencies, offices in one tree with search and obligations).

Metrics¶

• Metrics — Time-series obligation and award-count metrics for entities, NAICS codes, and PSC codes (same URL pattern and query params for all).

Reference data¶

Lookup tables and codes used across awards and entities.

• Assistance listings (CFDA) — CFDA program numbers and titles for federal grants/assistance (reference list only).
• Business types — SAM.gov business type codes (e.g., small business, 8(a), HUBZone).
• MAS SINs — MAS Special Item Numbers (SINs) reference data (used for GSA schedule enrichment).
• NAICS — North American Industry Classification System codes (industry classification).
• PSC — Product/Service Codes for federal contracting (from the PSC Manual).