For AI agents

Structured second-hand price data over plain HTTP. Pay per call in USDC on Base with x402 — no signup, no API keys, no invoices.

Endpoints

Endpoint	Returns	Price
`GET /api/worth?q=<item>`	low / typical / high estimate, sample size, confidence, source	$0.01
`GET /api/deal?q=<item>&price=<asking>`	verdict: great deal · good deal · fair price · above average · overpriced	$0.01
`GET /api/history?q=<item>`	tracked daily snapshots and trend	$0.02
`GET /health`	service status and integrations	free

Payment flow (x402 v2)

1. curl -i "https://reusefulshop.com/api/worth?q=the+beatles+abbey+road+vinyl"
   → HTTP 402 + PAYMENT-REQUIRED header (price, asset, payTo, network)

2. agent signs a USDC payment on Base (exact scheme)

3. retry the same request with the payment header
   → HTTP 200 + data, settlement handled by https://x402.dexter.cash (no fees)

Network: eip155:8453 · asset: USDC · receive address: 0xb876145625B6ED670657116187aEF7fAcf1ac288

Machine-readable discovery

/.well-known/x402.json — resource manifest with prices
/.well-known/agent-card.json — agent card
/llms.txt — summary for AI assistants
/sitemap.xml — indexed item pages

Listed on agentmarketplace as reusefulshop/worth and discoverable through the x402 Bazaar extension on every 402 challenge.

Try it from a browser

Humans get 10 free browser lookups per day: