{"uid":"cap_KK5buw_hLDNSRgD41uGwJ","slug":"fastapi-online-topic-extractor-4a752b97","name":"fastapi.online Topic Extractor","description":"Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.","url":"https://api.fastapi.online/topic-extract","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"text":{"type":"string","maxLength":8000,"minLength":1}}},"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_v2ZrSqABTbjvTUdrcNRbO","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":"Extracts the main topics or themes from a block of text using self-hosted AI inference","exampleAgentPrompt":"Can you extract the main topics from this article? Here's the text: 'The Federal Reserve raised interest rates again this week, citing persistent inflation in housing and energy markets. Economists are divided on whether further hikes will tip the economy into recession.'","exampleUseCases":[{"title":"Tagging news articles automatically","prompt":"I have this news article and I need to know what topics it covers so I can tag it in our CMS — can you pull out the main subjects from it? Here's the text: 'Apple unveiled its latest iPhone lineup at a San Francisco event, featuring improved camera hardware and a new AI-powered assistant chip, driving shares up 4% on the day.'"},{"title":"Content categorization for search indexing","prompt":"I need to categorize this blog post for our search index — can you extract the key topics from this text? 'Remote work has reshaped urban real estate, with downtown office vacancies hitting record highs while suburban coworking spaces see unprecedented demand.'"},{"title":"Research paper topic detection","prompt":"Can you tell me what the main topics and themes are in this abstract? 'We present a novel deep learning architecture for protein structure prediction that outperforms existing methods on benchmark datasets, with implications for drug discovery and genetic disease research.'"}],"resultDescription":"A list of extracted topics or themes identified in the input text, typically as a set of labels or keyword phrases representing the primary subjects covered in the content.","failureModes":["Text too short or empty — returns validation error or empty topic list","Text exceeds 8000 character limit — rejected with input validation error","Payment not provided — returns HTTP 402 Payment Required","Ambiguous or incoherent text — may return low-quality or generic topics","Service unavailable — returns 5xx error if self-hosted model is down"],"whenToPreferThis":"Choose this endpoint when you need a cheap, no-signup, pay-per-call topic extraction call at $0.001 USDC, especially in automated pipelines where cost per call matters. Prefer it over heavyweight NLP APIs when you don't need entity linking or deep ontology mapping — just the main topics from a chunk of text up to 8000 characters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:00:32.142Z","isFirstParty":false}