US Grants.gov Federal Funding Opportunity Change Watch

Federal funding opportunities on Grants.gov as they move: new postings, a forecast turning into a live posting, deadline amendments, changes to the award ceiling / floor / estimated funding / number of awards, eligibility changes, cancellations and withdrawals, agency or CFDA programme changes, and changes to the attached documents. Each delta is typed, and you choose which types you want. Keyed on the Grants.gov opportunity id.

    ## Source
    Grants.gov public Search2 and FetchOpportunity APIs (public, logged-out)
    - https://api.grants.gov/v1/api/search2

• https://api.grants.gov/v1/api/fetchOpportunity

  Public, logged-out only — no API key, login, cookie or CAPTCHA.
  
    ## The eight delta types
    | value | fires when |
    |---|---|
    | `new-opportunity` | an opportunity appears in the watched set |
    | `forecast-to-posted` | status moves `forecasted` → `posted` |
    | `deadline-amendment` | the close date or synopsis response date moves |
    | `funding-range-change` | award ceiling, floor, estimated funding, number of awards or cost sharing changes |
    | `eligibility-change` | the set of eligible applicant types changes |
    | `opportunity-cancellation` | status moves into closed/archived/withdrawn, or the record is delisted |
    | `agency-program` | the agency, agency code or CFDA programme list changes |
    | `opportunity-document-change` | the attached document set changes |
  
    Leave `delta_types` empty for all eight. Every emitted delta carries `delta_kinds`
    naming which ones it satisfied.
  
    The last three need a per-opportunity detail read. Selecting any of them narrows
    the watched set to `max_detail_reads` opportunities, newest first, and uses a
    separate baseline — so a list-mode baseline is never diffed against a detail-mode
    read.
  
    ## Pricing (staging state)
    | Event | Price (FREE tier) |
    |---|---|
    | Actor start (`apify-actor-start`) | $0.02 one-time |
    | Source check (`source-check`) | $0.10 |
  
    `source-check` ladder, GOLD-floored: **$0.10 / $0.09 / $0.08 / $0.067**.
    Charged once per run after the source enumeration terminates — seed runs and
    genuine-zero runs included. It is **not** charged when the source refused the read.
  
    The per-delta value event (`grant-opportunity-delta`) is **not priced yet**. Deltas are
    emitted unbilled until the ratified sheet is filed, and nothing is published first.
  
    ## Snapshot mode is a PREVIEW
    `watch_mode: false` returns at most **25 records**, hard-capped in code, labeled
    `output_mode: "preview"`. This actor sells change detection, not bulk export.
  
    ## Watch semantics
    The first watch run stores a private baseline and emits **zero** deltas. Billed
    deltas are capped at 500 per run; the overflow is a named PARTIAL withholding,
    never billed, and re-detected next run. When a read is truncated, `REMOVED` is
    suppressed rather than reported as a cancellation.
  
    ## Terminal states
    `NORMAL` · `SUCCEEDED-0: GENUINE_EMPTY` · `SUCCEEDED-0` (no change) · `PARTIAL` · `BLOCKED`.
    A zero with no evidence FAILS loud rather than exiting 0 quietly.
  

Pricing

Event	FREE	BRONZE	SILVER	GOLD+
Actor Start (apify-actor-start)	$0.02	$0.02	$0.02	$0.02
Source check (source-check)	$0.10	$0.09	$0.08	$0.067

Prices are the filed pay-per-event amounts per plan tier (PLATINUM/DIAMOND match GOLD). Blocked and refused runs do not intentionally charge value events.