Mod History
Federal Contract Modification Lookup

Type a contract PIID and pull its base award plus the full modification history: every mod, what it was for, and what it obligated. Live from USASpending.gov.

Source: USASpending.gov public API. No login, no key.

Contract PIID

Enter the full contract number exactly as it appears (letters and digits).

What this shows

Base award is modification 0: the original contract description and terms.
Each mod is one transaction against the award, with its own action date, action type, obligated amount, and description.
Parent IDV, when present, is the indefinite-delivery vehicle this order was placed against.

Notes

Obligation amounts are per-transaction. Negative values are deobligations.
DoD contract data carries a mandatory ~90-day USASpending publication delay.
Mod descriptions reflect what the contracting office entered; some are terse or blank.

Source

api.usaspending.gov, queried live per lookup.
One of the 1102tools utilities for the acquisition workforce.