# Online Shipping Calculator

> Free US shipping rate calculator: live USPS, UPS, and FedEx package rates,
> USPS postage and stamp prices, shipping discounts, and guides on the
> cheapest way to ship.

## MCP server (live rates API for AI agents)

This site offers a free, no-auth Model Context Protocol server. POST JSON-RPC 2.0
to https://onlineshippingcalculator.com/api/mcp — tools: get_shipping_rates
(live USPS/UPS/FedEx package rates between US ZIP codes), get_postage_price
(USPS First-Class letter/large-envelope/postcard prices with exact stamp
combinations). Human docs: https://onlineshippingcalculator.com/mcp

## Key pages

- [Shipping calculator](https://onlineshippingcalculator.com/): compare live package rates
- [Envelope & stamp calculator](https://onlineshippingcalculator.com/envelopes): postage prices and stamp combinations
- [Shipping discounts](https://onlineshippingcalculator.com/shipping-discounts): how to pay below retail rates
- [Guides](https://onlineshippingcalculator.com/guides): cheapest-way-to-ship guides by item and destination