API Documentation — 13D Watch

Authentication

The licensed API is at https://13dwatch.com/api/v1/. All requests carry a Bearer token issued at onboarding.

$ curl -H "Authorization: Bearer 13dw_•••••••••••" \
    https://13dwatch.com/api/v1/feed

A read-only public preview at /api/feed exists for journalism, citation, and exploration; rate-limited and not commercially licensable.

Endpoints (v1)

GET/api/v1/feed

Recent activist filings with full enrichment — insider activity, institutional consensus, short interest, multi-activist clustering, filer history, structured analyst brief with intent classification.

$ curl -H "Authorization: Bearer 13dw_•••" https://13dwatch.com/api/v1/feed | jq '.filings[0]'
{
  "accession_number": "0001193125-26-173780",
  "form_type": "SCHEDULE 13D",
  "filing_date": "2026-04-23",
  "date_of_event": "2026-04-20",
  "filer_name": "Illumina Innovation Fund II, L.P.",
  "filer_cik": "0002104204",
  "issuer_name": "Alamar Biosciences, Inc.",
  "issuer_cik": "0001998213",
  "issuer_ticker": "ALMR",
  "cusip": "010911105",
  "securities_class": "Common Stock, par value $0.0001 per share",
  "shares_owned": 5856536,
  "percent_owned": 9.6,
  "purpose": "The information set forth in Item 3 ...",
  "filing_url": "https://www.sec.gov/Archives/edgar/data/2104204/...",
  "issuer_cluster": { "filings_in_window": 2, "window_days": 90 },
  "insider_activity": { "buys": 0, "sells": 0, "..." : "..." },
  "institutional_consensus": { "num_holders": 0, "..." : "..." },
  "short_interest": { "current_short_interest": 0, "days_to_cover": 0 },
  "ai_brief": {
    "summary": "Illumina's corporate venture arm filed a 13D on ALMR ...",
    "intent": "strategic",
    "confidence": "medium"
  }
}

GET/api/v1/screener

Filtered query against the live filing set. Parameters: form, min_stake, insider, min_consensus, min_short, min_dtc, ticker.

GET/api/v1/issuer/{ticker_or_cik}

Per-issuer profile: every activist filing on the issuer, full insider activity, institutional consensus, short-interest history.

GET/api/v1/filer/{cik}

Per-filer profile: every position the filer has taken, hit rate, average holding period.

GET/api/v1/filing/{accession}

Single filing with full enrichment.

GET/api/v1/usage

Your account's plan, call count, and rate limits.

Service levels

Professional: 99.5% uptime target, sub-second p95 read latency.
Enterprise: 99.9% uptime SLA, dedicated rate limits, custom signal endpoints, redistribution license.

Stability and versioning

The current API is v1. Breaking changes ship behind /api/v2/ with v1 supported for twelve months in parallel. Field additions are non-breaking.

For high-volume integrations, custom webhooks, or co-development, contact us.

Programmatic access to the 13D Watch feed.

Authentication

Endpoints (v1)

Service levels

Stability and versioning

Build on the feed.