Polygon.io (Massive)
Real-time and historical market data APIs for stocks, options, forex and crypto
About Polygon.io (Massive)
Polygon.io, now rebranded as Massive, provides REST and WebSocket APIs for US stocks, options, indices, forex and crypto. It is widely used by developers building apps and quant research. Stocks Advanced was listed at $199/mo for individuals at last check.
Pros
- Broad US coverage
- Real-time WebSocket feeds
- Solid documentation
Cons
- Brand and URL changed recently
- Commercial use costs more
- Individual plans are restricted
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