{"uid":"cap_DrxKsglNMSm7MAwew5VWA","slug":"fastapi-online-tone-adjust-ce576a9f","name":"fastapi.online Tone Adjust","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/tone-adjust","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"text":{"type":"string","maxLength":8000,"minLength":1},"tone":{"type":"string","maxLength":40,"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_wgv7mR4n_XphS6_zVRD-n","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":"Rewrites a given text in a specified tone (e.g. formal, friendly, persuasive) using a self-hosted AI model, paid per call.","exampleAgentPrompt":"Can you rewrite this message in a more professional tone? Here's the text: 'hey just checking in again, when are you gonna send those files over lol'","exampleUseCases":[{"title":"Professionalizing a casual email draft","prompt":"I wrote this to my client but it sounds too casual — can you make it sound more formal and professional? Here's the text: 'Hey! So yeah we finished that thing you asked about, let us know what you think ok?'"},{"title":"Softening a harsh rejection message","prompt":"This rejection email I drafted sounds way too blunt — can you rewrite it in a more empathetic and gentle tone? Text: 'We are not moving forward with your application. You were not a good fit.'"},{"title":"Making marketing copy more persuasive","prompt":"Can you rewrite this product description in a persuasive tone to make it more compelling for buyers? Here's the text: 'This is a water bottle. It holds 32 oz and has a lid.'"}],"resultDescription":"Returns the original text rewritten in the requested tone. The output is a string of AI-generated prose that preserves the core meaning and information of the input while adjusting stylistic and emotional qualities to match the specified tone.","failureModes":["Empty or missing 'text' field returns a validation error","Missing or blank 'tone' field returns a validation error","Text exceeding 8000 characters is rejected","Ambiguous or unsupported tone strings may produce inconsistent results","Payment failure (402) if USDC payment is not provided or insufficient","Model may occasionally produce output that partially drifts from the requested tone"],"whenToPreferThis":"Choose this endpoint when you need a lightweight, per-call, no-signup tone transformation for text of up to 8000 characters and want to pay with crypto (USDC). It is ideal for agents that need tone adjustment without committing to a subscription, or when integrating into an x402 payment workflow. Prefer alternatives like OpenAI or Anthropic APIs if you need a guaranteed specific model, fine-grained control over generation parameters, or higher throughput.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T01:03:14.712Z","isFirstParty":false}