{"uid":"cap_VImmOVUu_1hljrkWlS--K","slug":"tempo-halowerk-com-api-response-time-to-first-render-renderstart-28b153a1","name":"tempo.halowerk.com – API Response Time to First Render (Renderstart)","description":"Prüft am Objekt api-antwort den Befund Zeit bis zum sichtbaren Renderstart.","url":"https://tempo.halowerk.com/v1/pruef/tempo/renderstart/api-antwort","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_MOPkrlsS2dcUE88iI2iBf","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":"Checks the time-to-first-render (visible render start) of an API response object at a given URL.","exampleAgentPrompt":"Can you check how long it takes for https://api.mysite.com/products to reach visible render start? I want to know the time-to-first-render for that API response.","exampleUseCases":[{"title":"API render latency audit","prompt":"Check the time-to-first-visible-render for https://api.example.com/v2/listings and tell me how long the render start takes — I'm trying to optimize my API's perceived load speed."},{"title":"Pre-launch performance check","prompt":"Before we go live, can you measure the renderstart time for our API endpoint at https://staging.myapp.com/api/data? I want to make sure the visible render starts quickly enough."},{"title":"Competitor API benchmarking","prompt":"I want to benchmark how fast https://partner.site.com/api/feed starts rendering — can you measure the time to first render for that API response URL?"}],"resultDescription":"Returns a performance finding with the measured time (in milliseconds or seconds) until the API response object reaches visible render start, allowing developers to assess and optimize frontend rendering performance.","failureModes":["Target URL is unreachable or returns an error — endpoint cannot measure render start","URL is not a public HTTP(S) address — validation failure","Target does not produce a renderable response — no render start can be detected","CSS selector matches no element — falls back to first matching object or returns error","Request times out if the target is too slow to respond"],"whenToPreferThis":"Use this endpoint when you specifically need to measure the time-to-first-visible-render (renderstart) for an API response object, as opposed to a full page, iframe, video, or document. It is ideal for diagnosing perceived API performance bottlenecks at the render-start stage, distinct from DNS resolution time, total load time, or render-blocking resource counts.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:49:53.677Z","isFirstParty":false}