Introduction

Signals Infra is the US public-company disclosure corpus, served as a REST API, an MCP server, and a cited answer engine. It is built first-party from the primary record — SEC EDGAR, FINRA, Senate/House disclosures, and issuer investor-relations sites — never repackaged from a third-party data vendor.

The product invariant: provenance

Every fact you get back carries a provenance object:

"provenance": {
  "src_id": "src_kpi2_9f8e7d6c",
  "source_provider": "sec",
  "source_url": "https://www.sec.gov/Archives/.../ex99-1.htm",
  "accession": "0001543151-26-000012",
  "quote": "Gross Bookings grew 18% year-over-year to $44.8 billion…",
  "content_hash": "sha256:ab12…",
  "extracted_at": "2026-05-01T15:02:21Z"
}

quote is present for LLM-extracted facts (KPIs, extracted facts) and null for structural facts (XBRL, prices). A serving-time allowlist guarantees no vendor-sourced row can ever appear in a response — only sec, signals_transcript, signals_ir, signals_rss, issuer-page, FINRA, and licensed price providers pass the gate.

What’s in the corpus

Family	What it is	Tier
Companies	Issuer universe, profiles, executives, segments, peers	Free
Events	Earnings calls, investor days — with their filing/deck/transcript bundle	Free
Filings	SEC filings (10-K/Q, 8-K, DEF 14A) + exhibit text	Free
Documents	IR decks, presentations, press releases	Free
Transcripts	First-party earnings-call transcripts (speakers, chapters, timestamps)	Builder+
KPIs	Company-native operating metrics with quote + source per point	Free (delayed) / Starter (fresh)
Fundamentals	XBRL canonicals + statements	Free (12mo) / Starter (full)
Scores	Altman Z, Piotroski F, DCF, red flags	Starter
Ownership	Form 4 insider, 13F holdings, congress trades, short interest	Free
Funds	N-PORT holdings, NAV, fund-exposure inversion	Starter (alpha)
Prices	Daily bars (2016→) + corporate actions	Builder+
Search	Semantic + keyword search across the whole corpus	Free
Ask	Cited answer engine over everything	Credit-metered

Alpha

The v1 surface is alpha. Schema names and types are stable. Breaking changes get 90 days’ notice via the Sunset and Deprecation response headers (RFC 8594) and a changelog entry.