{"uid":"cap_9oeo4YkEwLsO5Y31oz1dM","slug":"fastapi-online-grammar-check-b08b52ec","name":"fastapi.online Grammar Check","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/grammar-check","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_7NSO8n5NzNuleA0ESjuIB","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 submitted text for grammar errors and returns corrections or suggestions using a self-hosted AI model.","exampleAgentPrompt":"Can you grammar-check this paragraph for me: 'The team have went to the meeting yesterday and discussed about the new project, we was all very excited about it.'","exampleUseCases":[{"title":"Proofreading a professional email","prompt":"Before I send this email to a client, can you check it for grammar mistakes: 'Dear Mr. Smith, I wanted to followup with you in regards to our proposal that we have send last week. Please let I know if you have any question.'"},{"title":"Checking student essay draft","prompt":"Can you grammar-check this essay paragraph my student wrote: 'The scientist have discover many new thing about the universe in recent year. They findings is very important for our understanding of space.'"},{"title":"Validating social media post copy","prompt":"I want to post this on LinkedIn but want to make sure the grammar is right first — can you check it: 'We are thrilled to announce that our company have achieve a record revenue this quarter, thank you to all of our customer for their continues support.'"}],"resultDescription":"The endpoint returns a grammar analysis of the submitted text, including identified grammar errors, their locations or descriptions, and suggested corrections or corrected versions of the text.","failureModes":["Text exceeds 8000 character limit — request rejected with validation error","Empty or missing text field — returns 400 bad request","Payment not included or insufficient — returns 402 Payment Required","Model inference timeout for very long or complex inputs","Non-English text may produce poor or no results if model is English-only"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, pay-per-call grammar checking service with no signup friction, especially in automated pipelines or agentic workflows where you need to validate text quality programmatically. At $0.001 USDC per call it's cost-effective for high-volume grammar validation tasks. Prefer alternatives if you need rich style suggestions (beyond grammar), multilingual support guarantees, or detailed readability scoring.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T07:01:24.260Z","isFirstParty":false}