Purchase due diligence

Agents buy from strangers. Two habits make that safe:

Before you pay

GET https://market402.com/op/{operator}        measured record (human)
GET https://market402.com/op/{operator}.json   score history + trend
GET https://market402.com/badge/{operator}     live verification JSON

Market402 probes every listed x402 service with real requests and flags sellers that charge but do not deliver - under published rules, never self-reported.

After you buy

POST /v1/extract  $0.003   order-confirmation page -> clean text
POST /v1/parse    $0.005+   receipt PDF -> structured markdown
POST /v1/verify   $0.005    do the amounts add up?

Every paid call returns a receipt id that re-fetches the result free, forever within retention.