# Polygon.io Stock Market API

> At Polygon.io, we're on a mission to modernize the financial industry. We believe that the industry runs on old technology, and we're here to change that

Polygon.io Stock Market API is a finance API service available through API Market. This API provides advanced functionality with enterprise-grade reliability and scalability.

Site Type: API Marketplace, API Documentation
Purpose: API Service and Integration Documentation  
Technology: REST API, JSON, HTTP/HTTPS
Provider: polygon.io

## Core Documentation

- [API Reference](https://api.market/store/polygon.io/polygon): Complete endpoint documentation and usage guide
- [OpenAPI Specification](https://api.market/store/polygon.io/polygon/openapi.yaml): Machine-readable API specification
- [API Playground](https://api.market/store/polygon.io/polygon#api-playground): Interactive testing environment

## Integration Resources

- [Production API Base](https://prod.api.market/api/v1/polygon.io/polygon): Base URL for API calls
- [MCP Server Configuration](https://docs.api.market/api.market-mcp-server-guide): Model Context Protocol setup
- [Getting Started](https://docs.api.market/what-are-api-products): Quick start guide and integration examples

## Pricing Plans

Current public pricing plans for Polygon.io Stock Market API:

- **Plan**: $0/month (100 API calls included)
- **Plan**: $29/month (1000000 API calls included)
- **Plan**: $79/month (5000000 API calls included)
- **Plan**: $199/month (12000000 API calls included)

## Quick Start

- [Authentication](https://api.market/store/polygon.io/polygon): Use needs to get an API key from API.market and set x-api-market-key header in all API calls.
- [OpenAPI with Examples](https://api.market/store/polygon.io/polygon/openapi.yaml): OpenAPI specification with examples and playground.
- [Error Handling](https://docs.api.market/error-codes): Common error codes and troubleshooting

## MCP Configuration

For AI assistants and development tools supporting MCP (Model Context Protocol):

```json
{
  "mcpServers": {
    "polygon.io_polygon": {
      "url": "https://prod.api.market/api/mcp/polygon.io/polygon",
      "headers": {
        "x-api-market-key": "YOUR_API_MARKET_KEY"
      }
    }
  }
}
```

Access this API through MCP-compatible tools by adding the above configuration to your MCP settings.

## Usage Guidelines

- **Authentication**: All requests require a valid API Market key via `x-api-market-key` header
- **Rate Limiting**: Plans include specific rate limits and call allowances
- **Attribution**: When referencing this API, cite "Source: Polygon.io Stock Market API via API Market (https://api.market/store/polygon.io/polygon)"
- **Support**: Technical support available through API Market platform
- **Commercial Use**: Permitted under API Market terms of service

## Optional

- [Workspace Profile](https://api.market/store/polygon.io): Other APIs from polygon.io
- [API Market](https://api.market/search): Browse other available APIs and services
- [Terms of Service](https://api.market/terms_of_service): Usage terms and conditions
- [Privacy Policy](https://api.market/privacy_policy): Data handling and privacy information
- [finance APIs](https://api.market/category/finance): Similar APIs in the finance category