Valuein vs Polygon.io
Polygon owns market data — Valuein owns auditable SEC fundamentals
The key difference
Polygon is the right tool for prices and real-time market data, and it even advertises point-in-time fundamentals with field-level traceability. Valuein goes deeper on the fundamentals themselves: 1993 history, a survivorship-free delisted universe, audited ratios, smart-money and forensic tools, and a fact_id that resolves to the source filing — fundamentals as the core, not an add-on.
Outcomes that matter
What you actually get done — not just a feature checklist.
| The job | Valuein | Polygon.io |
|---|---|---|
| Real-time prices & market data | Not our focus — pair with a price feed | Best-in-class real-time + WebSocket |
| Deep fundamentals backtest | 1993 → present, survivorship-free | ~10 years, fundamentals are secondary |
| Audit any number an agent returns | fact_id → exact SEC filing | Field-level XBRL traceability on fundamentals |
| Entry price | $0 free tier, then $49/mo | Free, then $29–$199/mo (verified) |
Feature Comparison
| Feature | Valuein | Polygon.io |
|---|---|---|
| Fundamentals Depth | 1993 → present, core product | ~10 years, secondary to market data |
| Survivorship Bias | All delisted companies included | Not advertised for fundamentals |
| Standardization | 292 standard concepts + audited ratios | XBRL fundamentals, fewer derived ratios |
| Smart Money | Insider + 13F + forensic audit tools | Not a focus |
| AI Agent Access | MCP + agent-safety guardrails | Official MCP server |
| Per-fact Audit Trail | fact_id → SEC filing | Field-level traceability on XBRL |
| Format | Parquet bulk + SDK + MCP | REST/WebSocket + official SDKs |
Polygon.io details and pricing are based on publicly available information as of June 2026 and may have changed — verify on their site. Where a competitor's figure is vendor-reported or estimated, we say so.
Where Polygon.io is stronger
- Polygon's real-time and historical market data (prices, WebSocket) is far ahead — we don't compete there
- Polygon's developer experience (official Python/JS/Go SDKs) is excellent and mature
- Polygon already advertises point-in-time fundamentals + field-level traceability, so PIT alone isn't our edge against them
Best for
Developers and quants who already have a market-data feed (or use Polygon for it) and need deep, auditable, survivorship-free SEC fundamentals for research and AI agents.
Frequently asked questions
Should I use Valuein or Polygon?
Use Polygon for prices and real-time market data. Use Valuein when SEC fundamentals are the job — deep history, survivorship-free delisted names, audited ratios, smart-money signals, and fact-level provenance for AI agents. Many users run both.
Polygon also claims point-in-time fundamentals — why switch?
Against Polygon the differentiator isn't PIT itself, it's depth and auditability: 1993 history vs ~10 years, a survivorship-free universe, audited ratios, and a fact_id that resolves to the exact filing for one-click verification.
Start comparing today
No credit card. Free S&P500 data immediately, then Pro at $49/mo or Institutional at $499/mo. No sales call — just data.