# reusefulshop

> Answers one question: what is a second-hand item worth? Prices come from live marketplace data (Discogs marketplace lows, eBay asking prices) with a fast judgment layer. Humans use the free website; AI agents use the paid HTTP API with x402 micropayments in USDC on Base - no signup, no API keys.

## Free (humans)
- [Value search](https://reusefulshop.com/search?q=the+beatles+abbey+road+vinyl)
- [Vinyl value guide](https://reusefulshop.com/value/vinyl)
- [Health](https://reusefulshop.com/health)
- [Sitemap](https://reusefulshop.com/sitemap.xml)

## Paid API (agents, x402)
- GET https://reusefulshop.com/api/worth?q=<item> - $0.01 - low/typical/high estimate, sample size, confidence
- GET https://reusefulshop.com/api/deal?q=<item>&price=<asking> - $0.01 - verdict: great deal / good deal / fair price / above average / overpriced
- GET https://reusefulshop.com/api/history?q=<item> - $0.02 - tracked price history and trend
- Free tier: 10 browser calls/day per IP

## Payment
- Protocol: x402 v2 (HTTP 402 with a PAYMENT-REQUIRED header), network: eip155:8453, asset: USDC
- Facilitator: https://x402.dexter.cash (no account needed)

## Machine-readable
- https://reusefulshop.com/.well-known/x402.json - resource manifest with prices
- https://reusefulshop.com/.well-known/agent-card.json - agent card