✓ Receipts, not vibes
Every filings answer carries the SEC accession number and a deep link to the exact source document. Quintarthai research receipts are ed25519-signed and publicly re-verifiable — GET /receipts/{id}/verify.
The financial-data API where numbers carry receipts.
Filings-grade data straight from public SEC EDGAR sources — filings search, Form 4 insider transactions, 13F holdings, risk-factor diffs, cross-border reference tables — plus ed25519-signed research receipts anyone can re-verify. Served over REST, MCP (ChatGPT & Claude), and straight into Google Sheets. Commercial use permitted on every tier, because none of it carries a third-party market-data license.
Get a free API key → API reference Connect ChatGPT / Claude
Why this API is different
✓ Commercial use included
The data lanes are SEC EDGAR-derived and Quintarthai-compiled — public-domain sources with no upstream redistribution restrictions. No enterprise-tier paywall just to use it in your product.
✓ Header auth + OpenAPI
Authorization: Bearer keys that stay out of URLs and server logs (query-param fallback only where spreadsheets require it), plus a machine-readable OpenAPI spec and Swagger UI.
✓ The endpoints others skip
Filings search, Form 4 insider, 13F holdings, activist 13D / passive 13G flows, risk-factor diffs between filings, IPO S-1 extraction, NI 43-101 drill interpretation, Canada↔US withholding tables.
✓ AI-native (MCP)
A hosted Model Context Protocol server with as-of (point-in-time) filing search and re-verifiable figure checks — connect it to ChatGPT (developer mode), Claude, Claude Code, or Cursor by URL.
✓ Sheets in one cell
Any GET endpoint returns TSV with ?format=excel — paste an IMPORTDATA formula and your sheet fills itself.
Sixty-second start
# 1. Create a free account + mint a key: https://quintarthai.com/developers.html
# 2. Call it:
curl "https://quintarthai.com/api/v1/data/filings/search?ticker=AAPL&form=10-K" \
-H "Authorization: Bearer qt_live_YOUR_KEY"
# 3. Or fill a spreadsheet:
=IMPORTDATA("https://quintarthai.com/api/v1/data/dual-listings?format=excel&apikey=qt_live_YOUR_KEY")
Data lanes
| Lane | Endpoint family | Source |
|---|---|---|
| Filings search + deep links | /api/v1/data/filings/search | SEC EDGAR |
| IPO S-1 / F-1 extraction | /api/v1/data/filings/s1/{ticker} | SEC EDGAR |
| Risk-factor filing diffs | /api/v1/data/filing-diff/{ticker} | SEC EDGAR |
| Form 4 insider transactions | /api/v1/data/form4 | SEC EDGAR |
| 13F institutional holdings | /api/v1/data/13f/* | SEC EDGAR |
| Activist / passive stake flows | /api/v1/data/activist-13d · /passive-13g | SEC EDGAR daily index |
| Signed research receipts | /api/v1/data/receipts/{id}/verify | Quintarthai (ed25519) |
| Canada↔US withholding | /api/v1/data/withholding | Quintarthai-compiled treaty table |
| Dual-listing symbology | /api/v1/data/dual-listings | Quintarthai-curated mapping |
| NI 43-101 drill interpreter | /api/v1/data/drill/interpret | Quintarthai deterministic engine |
Live, self-documenting endpoint index: /api/docs · GET /api/v1/data/catalog · OpenAPI: /api/v1/public/openapi.json. Market quotes and vendor-licensed fundamentals are intentionally NOT served here — this surface only ships data we can license you to reuse, including commercially.
Included in every membership
The API is not a separate product — every Quintarthai plan includes it, alongside the research app, Quinn, the AI connector (MCP) and Sheets. Commercial use is permitted on every tier, including free. Limits below load live from GET /api/v1/data/plans.
| Plan | Price / mo | Req / min (per key) | Req / day (account) | Active keys | Commercial use |
|---|---|---|---|---|---|
| Loading current limits… (if this doesn't load, see pricing) | |||||
req/day is pooled across all keys on the account; plan changes apply to existing keys instantly. Full plan details and app features: quintarthai.com/#pricing.
Honest limits
Coverage is US + US-cross-listed filers (what SEC EDGAR holds). Canadian-only SEDAR+ filings, earnings-call transcripts, and vendor-licensed market data are not in this API. 13F issuer matching is by issuer name, not CUSIP. Every tier is rate-limited (see the plans table above). If an endpoint can't source an answer it says so explicitly — it never fills gaps.
API outputs are published research data — identical for every caller requesting the same security, not tailored to you, and not investment advice. Quintessentia Network Inc. and its directors and officers hold no position in, and receive no compensation from, any issuer analyzed; should any such interest ever arise, a specific disclosure will be presented alongside the affected analysis. Disclosures · Terms