{"uid":"cap_RZW6NjIXaNwjP0nh-YQ45","slug":"fastapi-online-cefr-level-estimator-6f00d6e8","name":"fastapi.online CEFR Level Estimator","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/cefr-level-estimate","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_14HcgiGoB9vMF93wb2fu2","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":"Estimates the CEFR language proficiency level (A1–C2) of a given text sample using AI inference","exampleAgentPrompt":"Can you estimate the CEFR level of this paragraph I wrote: 'The government has implemented several measures to address the growing concerns regarding environmental sustainability, yet critics argue that these efforts remain insufficient given the scale of the crisis.'","exampleUseCases":[{"title":"ESL curriculum content grading","prompt":"I'm building a reading exercise for intermediate English learners — can you check the CEFR level of this passage and tell me if it's appropriate for B1 students: 'Every morning, Maria takes the bus to work. She enjoys reading the newspaper during her commute and often stops at the café near her office for a cup of coffee.'"},{"title":"Language learner writing feedback","prompt":"My student submitted this essay paragraph — what CEFR level does it reflect? 'Although the consequences of climate change are widely acknowledged, many governments continue to prioritize short-term economic gains over long-term environmental policies, a contradiction that undermines global sustainability efforts.'"},{"title":"Localization readability audit","prompt":"We're adapting our help docs for non-native English speakers targeting a B2 audience — can you estimate the CEFR level of this snippet so I know whether to simplify it: 'To configure your account preferences, navigate to the settings panel and select the desired notification parameters from the dropdown menu.'"}],"resultDescription":"Returns an estimated CEFR proficiency level (e.g. A1, A2, B1, B2, C1, or C2) for the submitted text, likely with a confidence score or explanation indicating why the text was placed at that level based on vocabulary, syntax complexity, and other linguistic features.","failureModes":["Text too short or too ambiguous to classify accurately, resulting in a low-confidence or fallback response","Non-linguistic or code-heavy input may produce unreliable CEFR estimates","Text exceeding 8000 characters will be rejected by the input schema","Network or model inference errors may return a 500 or 402 payment-required response","If the text is in a language other than English, results may be inaccurate or undefined"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call CEFR classification without committing to a subscription or signup. It is especially useful for edtech platforms, language learning apps, or content pipelines that need programmatic difficulty labeling of text. Prefer it over general-purpose LLM prompting when you want a structured, consistent CEFR output rather than a conversational language assessment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T01:16:00.304Z","isFirstParty":false}