{"system":"GENESIS*","exists":true,"service":"url_digest","summary":"SHA-256 digest and change detection for a URL","description":"Fetch a public web resource and calculate its SHA-256 digest with HTTP metadata, ETag and Last-Modified information. Use for URL integrity verification, content fingerprints and website change detection.","execution":{"method":"POST","endpoint":"https://genesis.palsus2023.workers.dev/v1/url_digest","paymentRequired":true,"free":false,"price":"$0.003","protocol":"x402","network":"eip155:8453","currency":"USDC"},"discovery":{"service":"https://genesis.palsus2023.workers.dev/v1/url_digest","catalog":"https://genesis.palsus2023.workers.dev/catalog","services":"https://genesis.palsus2023.workers.dev/services","openapi":"https://genesis.palsus2023.workers.dev/openapi.json","x402":"https://genesis.palsus2023.workers.dev/.well-known/x402","health":"https://genesis.palsus2023.workers.dev/health"},"instructions":"GET returns free service metadata. POST executes the service and requires x402 payment."}