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Polygon.io

Cargo Docs

docs.rs/finance-query — Provider::Polygon

Feature flag required

finance-query = { version = "...", features = ["polygon"] }

Polygon.io provides real-time and historical market data for stocks, options, forex, crypto, indices, and futures. Free tier: 5 requests per second.

Setup

Set the API key via environment variable:

export POLYGON_API_KEY="your-polygon-api-key"

No manual init call needed — the provider reads the key during TickerBuilder::build().

Usage

use finance_query::{Capability, Fetch, Provider, Providers, Raw};

let providers = Providers::builder()
    .route(Capability::QUOTE, &[Provider::Polygon, Provider::Yahoo])
    .fetch(Fetch::Sequential)
    .build()
    .await?;
let ticker = providers.ticker("AAPL").build().await?;
let quote = ticker.quote::<Raw>().await?;

Capabilities

Data type Support
Quote ✓
Chart ✓
Fundamentals ✓
Corporate ✓
Options ✓
Market ✓
Discovery ✓
Indices ✓
Commodities —
Forex ✓
Crypto ✓
Futures ✓
Technicals ✓
Economic ✓
Filings ✓
Sentiment ✓

See Also