{"uid":"cap_KerbwGsRmv1Xw9JG-od3h","slug":"tempo-halowerk-font-time-to-first-paint-check-98048245","name":"Tempo Halowerk – Font Time-to-First-Paint Check","description":"Prüft am Objekt schrift den Befund Zeit bis zum sichtbaren Renderstart.","url":"https://tempo.halowerk.com/v1/pruef/tempo/renderstart/schrift","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"ziel":{"oneOf":[{"type":"string","maxLength":2048,"minLength":1,"description":"Öffentliche HTTP(S)-Adresse; bei DNS-Befunden Domain oder öffentliche IP."},{"type":"object","required":["adresse"],"properties":{"adresse":{"type":"string","maxLength":2048,"minLength":1},"selektor":{"type":"string","maxLength":240,"minLength":1,"description":"CSS-Selektor: genau ein Objekt, sonst erster Treffer des Objektfilters."},"vergleich":{"type":"string","maxLength":2048,"description":"Öffentliche Vergleichsadresse für Link-, Sitemap- oder Sprachbefunde."},"user_agent":{"type":"string","pattern":"^[A-Za-z0-9_-]{1,80}$"},"dkim_selektor":{"type":"string","pattern":"^[A-Za-z0-9_-]{1,63}$"}},"additionalProperties":false}]}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_uUAJUi_K_BwUykRSkFZdz","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Measures the time-to-first-paint (visible render start) for font/typeface resources loaded on a given URL.","exampleAgentPrompt":"Check how long it takes for fonts to visibly start rendering on https://example.com — I want the time-to-first-paint measurement for the font resources there.","exampleUseCases":[{"title":"Font render audit for e-commerce site","prompt":"Can you measure how long it takes for the fonts to start visibly rendering on https://shop.mybrand.com? I want to know the time-to-first-paint for the typefaces there."},{"title":"Diagnose slow typography on a blog","prompt":"My blog at https://myblog.example.com seems to flash unstyled text before fonts load — can you check the font render start time so I can see how bad the delay actually is?"},{"title":"Compare font performance on a specific page element","prompt":"Check the time-to-first-paint for the font on the element matching '.hero-title' at https://landing.myproduct.com — I want to know how quickly that heading typeface starts rendering."}],"resultDescription":"Returns a timing metric representing the duration (likely in milliseconds) from navigation start to the moment the font resource first becomes visibly rendered on the page, enabling performance benchmarking and optimization decisions.","failureModes":["Target URL is not publicly accessible or returns a non-200 status — endpoint cannot load the page","CSS selector matches no elements or multiple elements (first match used)","Font resources are hosted on private/authenticated servers that block the crawler","Network timeouts during page load result in no timing data","Invalid or malformed URL in the 'ziel' field returns a validation error"],"whenToPreferThis":"Choose this endpoint when you specifically need to measure the visual render start timing for font/typeface resources on a public URL, as opposed to general page render timing or other resource types (images, scripts, videos). Useful for diagnosing FOIT/FOUT issues and optimizing font loading strategies.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:45:52.370Z","isFirstParty":false}