Unit Price Comparator

Compare 2+ products' price-per-unit across mass/volume/count, converting units within the same dimension, and flag the best value.

Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.

Parameters

Parameter	Type	Required	Description
`items`	array	required	Array of 2+ {name, price, quantity, unit} objects

Call it over MCP (JSON-RPC 2.0)

curl -s https://wingmanprotocol.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "unit_price_compare", "arguments": {"items": []}}}'

Or plain HTTP

curl -s https://wingmanprotocol.com/tools/unit_price_compare \
  -H 'Content-Type: application/json' \
  -d '{"items": []}'

Try it live

Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/unit_price_compare from your browser.

This tool is x402-metered — agents pay per call with USDC on Base. The 402 response below is the standard x402 payment-requirements envelope: sign the EIP-3009 authorization and retry with the X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).