{"name":"webpage-diff","description":"Webpage change detection / website monitor / content diff. Cleans HTML to text + SHA-256 hash. Pass previous hash/text to get added/removed line lists. Price + policy + status-page monitoring.","price":"$0.04","method":"POST","input_schema":{"properties":{"url":{"type":"string"},"previous_hash":{"type":"string"},"previous_text":{"type":"string"},"selector":{"type":"string"}},"required":["url"]},"input_example":{"url":"https://example.com","previous_hash":"abc123..."},"output_example":{"url":"https://example.com","current_hash":"def456...","changed":true,"char_count":1024},"x402_payment_required":true,"x402_facilitator":"https://api.cdp.coinbase.com/platform/v2/x402"}