{"uid":"cap_tLUlRY3GErt_i46PwIWQe","slug":"canonical-url-declarations-empty-value-report-2d444210","name":"Canonical URL Declarations — Empty Value Report","description":"Canonical URL declarations — Empty value report: Empty value report for Canonical URL declarations. One public HTTPS page or supplied HTML; static parsing, no JavaScript rendering, login or access bypass. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded empty value report result.","url":"https://market.datapackvibe.com/x402/assistant-bx-web-canonical-empty?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","default":"","maxLength":2048},"html":{"type":"string","default":"<!doctype html><html><head></head><body><link rel=\"canonical\" href=\"https://www.iana.org/help/example-domains\" id=\"sample\"></body></html>","maxLength":100000},"term":{"type":"string","default":"product","maxLength":100,"minLength":1},"attribute":{"type":"string","default":"id","pattern":"^[a-zA-Z][a-zA-Z0-9:_-]{0,49}$","maxLength":50},"previous_texts":{"type":"array","items":{"type":"string","default":"","maxLength":1000},"default":["Older example"],"maxItems":200,"minItems":0},"attribute_value":{"type":"string","default":"sample","maxLength":200}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_jUwIXn1sL06NftV7AW_mP","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Parses a webpage or HTML snippet to identify canonical URL link elements that have empty or missing href values","exampleAgentPrompt":"Check this page for any canonical link elements that have empty or missing href values — use the URL https://example.com/product-page and look for elements with the attribute id set to 'main-canonical'.","exampleUseCases":[{"title":"SEO audit for canonical tag issues","prompt":"Scan https://shop.mystore.com/collections/sale for any canonical link elements that have an empty href — I want to know if there are any blank canonical declarations causing SEO problems, specifically looking at elements with the class attribute set to 'seo-canonical'."},{"title":"Pre-launch HTML QA check","prompt":"Before we publish, check this HTML snippet for empty canonical URL declarations: <!doctype html><html><head><link rel=\"canonical\" href=\"\" id=\"page-canon\"></head><body></body></html> — flag any canonical tags where the href is blank."},{"title":"CMS template canonical validation","prompt":"I'm auditing our CMS-generated pages — can you parse the HTML at https://blog.mysite.com/article/123 and report any canonical link elements that are missing or have empty href values, focusing on elements with the id attribute matching 'canonical-tag'?"}],"resultDescription":"Returns an empty value report identifying any canonical link elements in the provided URL or HTML where the href attribute is blank or absent, including element identifiers and relevant attribute details to help diagnose SEO or markup issues.","failureModes":["URL is inaccessible, behind a login, or returns a non-200 response","HTML exceeds 100,000 character limit","JavaScript-rendered canonical tags not captured (static parsing only)","Malformed HTML may cause incomplete parsing","Invalid attribute pattern (must start with a letter, alphanumeric/colon/underscore/hyphen only)","No canonical elements found returns an empty result set"],"whenToPreferThis":"Use this endpoint when you need lightweight, static HTML parsing to detect empty or missing canonical URL declarations on a single page — ideal for SEO audits, pre-publish QA checks, or CMS template validation where JavaScript rendering is not required and cost efficiency matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T00:52:36.567Z","isFirstParty":false,"canonicalSlug":"canonical-url-declarations-empty-value-report-2d444210"}