{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"lmnt","slug":"lmnt","name":"LMNT","type":"api","url":"https://www.lmnt.com","page_url":"https://unfragile.ai/lmnt","categories":["voice-audio"],"tags":[],"pricing":{"model":"usage-based","free":true,"starting_price":"$0.15/1K chars"},"status":"active","verified":false},"capabilities":[{"id":"lmnt__cap_0","uri":"capability://text.generation.language.ultra.low.latency.streaming.text.to.speech.synthesis","name":"ultra-low-latency streaming text-to-speech synthesis","description":"Converts text input to audio output via WebSocket streaming with 150-200ms end-to-end latency, enabling real-time speech generation for conversational AI agents and interactive applications. The system streams audio chunks progressively as text is processed, allowing playback to begin before synthesis completes, rather than waiting for full audio generation.","intents":["Build a conversational AI agent that speaks responses in real-time without noticeable delays","Create an interactive game with dynamic NPC dialogue that responds within 200ms","Develop a live tutoring application where the AI tutor can speak naturally mid-conversation","Implement speech output for a voice assistant that feels responsive and natural"],"best_for":["Real-time conversational AI applications requiring sub-250ms latency","Game developers building interactive NPCs with dynamic dialogue","Voice assistant builders prioritizing responsiveness over batch processing","Teams building WebSocket-based streaming architectures"],"limitations":["Streaming latency of 150-200ms is end-to-end; actual time-to-first-byte and per-character latency not specified","WebSocket streaming requires persistent connection management; no documented fallback to HTTP polling","Maximum text length per streaming request not documented; may require chunking for long utterances","Latency claims are stated but not independently verified; actual performance depends on network conditions and client implementation"],"requires":["API key from LMNT account (free tier or paid subscription)","WebSocket client library (native browser WebSocket API or Node.js ws library)","Audio playback capability (Web Audio API, native audio player, or equivalent)","Network connectivity with low latency to LMNT infrastructure (geographic region not specified)"],"input_types":["plain text (UTF-8 encoded)","text with optional language tags for mid-sentence language switching"],"output_types":["audio stream (format not specified in documentation; likely PCM or compressed audio)","streamed via WebSocket in chunks for progressive playback"],"categories":["text-generation-language","real-time-streaming"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_1","uri":"capability://text.generation.language.instant.voice.cloning.from.short.audio.samples","name":"instant voice cloning from short audio samples","description":"Creates custom voice models from 5-second audio recordings without training or fine-tuning delays, enabling unlimited studio-quality voice clones that can be used immediately for synthesis. The system extracts voice characteristics (timbre, prosody, accent) from the sample and applies them to any input text without requiring model retraining or additional data collection.","intents":["Clone a specific person's voice (CEO, brand ambassador, character) for personalized AI applications","Generate multiple character voices for a game or interactive story from actor recordings","Create branded voice experiences where the AI speaks in a company's distinctive voice","Build voice-customized customer service bots that match brand identity"],"best_for":["Game studios and interactive media creators needing multiple character voices","Enterprise customers building branded AI assistants with specific voice identities","Content creators personalizing AI narration with recognizable voices","Teams requiring rapid voice customization without ML expertise"],"limitations":["Requires 5-second minimum audio sample; quality of clone depends on sample audio clarity and consistency","No documented guidance on optimal sample characteristics (background noise tolerance, speaker consistency, accent variation)","Unlimited cloning is available but no documented limits on total clones per account or storage","Voice cloning quality and naturalness not independently benchmarked; subjective 'studio quality' claim not quantified","No documented ability to edit or fine-tune cloned voices after creation"],"requires":["Audio sample in supported format (format specifications not documented)","5 seconds of clear, consistent speech from target voice","API key with voice cloning enabled (available on Indie tier and above)","Method to upload audio sample (upload mechanism not documented)"],"input_types":["audio file (5+ seconds, format unknown)","voice identifier/name for the cloned voice"],"output_types":["voice model identifier for use in subsequent TTS requests","cloned voice usable across all 24 supported languages"],"categories":["text-generation-language","voice-customization"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_10","uri":"capability://automation.workflow.startup.grant.program.for.early.stage.voice.ai.companies","name":"startup grant program for early-stage voice ai companies","description":"Provides discounted or free API access to early-stage startups building voice AI applications, reducing initial TTS costs and enabling founders to validate product-market fit without significant infrastructure spending. The program details are not documented, but it's referenced as an available offering for qualifying startups.","intents":["Launch a voice AI startup with minimal TTS infrastructure costs","Validate product-market fit for voice-enabled applications before raising funding","Access production-grade TTS without paying full commercial rates","Focus engineering resources on product development rather than TTS infrastructure"],"best_for":["Pre-seed and seed-stage startups building voice AI products","Founders with limited budgets validating voice AI concepts","Teams pivoting to voice-first applications","Startups in accelerators or incubators"],"limitations":["Grant program details not documented; unclear what qualifies as 'early-stage' or what benefits are included","No documented application process or timeline for grant approval","No documented duration of grant period or renewal terms","No documented restrictions on use (e.g., geographic, industry, or business model restrictions)","Grant availability may be limited; no documented number of grants available per period","Unclear if grant includes support, priority support, or other services beyond API access"],"requires":["Startup status (definition not documented)","Application to LMNT startup program (process not documented)","Approval from LMNT team"],"input_types":["startup application information"],"output_types":["grant approval and API access terms"],"categories":["automation-workflow","business-model"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_11","uri":"capability://automation.workflow.enterprise.custom.pricing.and.dedicated.support","name":"enterprise custom pricing and dedicated support","description":"Offers custom pricing and dedicated support for enterprise customers with high-volume TTS requirements, large-scale deployments, or specialized use cases that don't fit standard tier pricing. Enterprise customers can negotiate volume discounts, SLAs, and dedicated infrastructure or support arrangements directly with the LMNT team.","intents":["Negotiate volume pricing for large-scale TTS deployments","Secure SLA commitments and dedicated support for mission-critical applications","Customize TTS infrastructure for specific enterprise requirements","Access priority support and technical assistance for complex integrations"],"best_for":["Enterprise companies with millions of characters/month TTS volume","Mission-critical applications requiring SLA guarantees","Teams needing dedicated infrastructure or custom integrations","Organizations with complex compliance or data residency requirements"],"limitations":["Enterprise pricing not transparent; requires direct negotiation","No documented SLA terms, support response times, or uptime guarantees","No documented minimum volume or contract terms for enterprise plans","No documented custom feature development or infrastructure customization options","Enterprise sales process not documented; unclear timeline or contact process","No documented geographic or data residency options for enterprise customers"],"requires":["Direct contact with LMNT sales team","Demonstration of enterprise-scale requirements"],"input_types":["enterprise requirements and volume projections"],"output_types":["custom pricing proposal and SLA terms"],"categories":["automation-workflow","business-model"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_2","uri":"capability://text.generation.language.multilingual.synthesis.with.mid.sentence.language.switching","name":"multilingual synthesis with mid-sentence language switching","description":"Synthesizes speech across 24 languages with the ability to switch languages mid-utterance within a single text input, enabling polyglot dialogue without separate API calls. The system detects language boundaries or explicit language tags in the input text and seamlessly transitions voice characteristics, pronunciation, and prosody between languages while maintaining consistent voice identity.","intents":["Create multilingual customer service bots that respond in the customer's language without separate requests","Build educational content where a tutor code-switches between languages naturally","Generate multilingual game dialogue where characters speak multiple languages in single conversations","Develop international AI assistants that handle mixed-language input naturally"],"best_for":["Global applications serving multilingual user bases","Educational platforms teaching language learning with native pronunciation","Game studios creating international content with polyglot characters","Customer service teams supporting multiple language communities"],"limitations":["Language switching mechanism not documented; unclear if automatic detection or explicit tagging required","No documented list of which language pairs support seamless switching; some combinations may have artifacts","Pronunciation accuracy for code-switched text not benchmarked; may struggle with proper nouns or technical terms in non-primary language","Voice identity consistency across language switches not quantified; may have subtle prosody shifts","No documented support for regional dialects or language variants (e.g., Brazilian Portuguese vs. European Portuguese)"],"requires":["API key with multilingual support enabled","Input text in supported language or with explicit language tags (format not specified)","Voice model that supports target languages (all pre-built and cloned voices support all 24 languages)"],"input_types":["plain text in any of 24 supported languages","mixed-language text with implicit or explicit language boundaries","text with optional language tags (tag format not documented)"],"output_types":["audio stream with seamless language transitions","single continuous audio output without gaps between languages"],"categories":["text-generation-language","multilingual-support"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_3","uri":"capability://automation.workflow.character.based.usage.metering.and.overage.billing","name":"character-based usage metering and overage billing","description":"Implements a character-based billing model where costs are calculated per 1,000 characters of input text synthesized, with tiered monthly allowances and per-character overage rates that decrease with subscription tier. The system tracks character consumption across all synthesis requests and applies overage charges when monthly allowance is exceeded, with no documented concurrency or rate limits on paid tiers.","intents":["Estimate and control TTS costs based on expected text volume","Scale from free tier to production without hitting undocumented rate limits","Plan budget for voice synthesis in applications with variable text length","Compare cost-per-character across different subscription tiers for capacity planning"],"best_for":["Startups and indie developers evaluating TTS costs before commitment","Teams with predictable text volume who can select appropriate tier","Applications with variable synthesis load that benefit from overage pricing","Cost-conscious builders comparing TTS providers on per-character basis"],"limitations":["Character counting methodology not documented; unclear if whitespace, punctuation, or special characters are counted","No documented way to set spending limits or alerts before overage charges accrue","Overage charges apply immediately; no grace period or monthly cap documented","Free tier (15K characters/month) is significantly smaller than Indie tier (200K); large gap may force free users to paid tier","No documented rollover of unused characters to next month; unclear if allowance resets on calendar month or subscription anniversary","Enterprise pricing requires custom negotiation; no transparent pricing for high-volume use cases"],"requires":["LMNT account with subscription tier selected (Free, Indie $10/mo, Pro $49/mo, Premium $199/mo)","Valid payment method for paid tiers","API key with billing enabled","Mechanism to track character consumption (not documented; likely automatic)"],"input_types":["text input to synthesis requests (character count extracted automatically)"],"output_types":["billing records and usage metrics (format and access method not documented)","invoice or usage dashboard (not documented)"],"categories":["automation-workflow","billing-metering"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_4","uri":"capability://text.generation.language.pre.built.voice.library.with.named.voice.models","name":"pre-built voice library with named voice models","description":"Provides a curated set of pre-built voice models (at least including 'brandon' voice) that are immediately available for synthesis without cloning or customization. These voices are optimized for naturalness and expressiveness across the 24 supported languages and can be used in production without additional setup or training.","intents":["Quickly prototype TTS applications without voice customization","Select from diverse voice options for different character types or use cases","Use professionally-optimized voices for production applications","Avoid voice cloning setup for applications that don't require custom voices"],"best_for":["Rapid prototyping and MVP development","Applications where generic voices are acceptable","Teams without specific voice customization requirements","Use cases where voice consistency across languages is important"],"limitations":["Total number of pre-built voices not documented; only 'brandon' is explicitly named","No documented voice characteristics (age, gender, accent, tone) to help selection","No documented ability to preview voices before use","Voice selection mechanism not documented; unclear if voices are selected by name, ID, or other identifier","No documented voice customization options (pitch, speed, emotion) for pre-built voices","Limited diversity information; unclear if voices represent different genders, accents, or age ranges"],"requires":["API key with access to voice library","Voice name or identifier (selection mechanism not documented)","No additional setup or training required"],"input_types":["text input for synthesis","voice identifier (format not documented)"],"output_types":["audio stream synthesized with selected pre-built voice"],"categories":["text-generation-language","voice-selection"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_5","uri":"capability://automation.workflow.commercial.license.for.synthesized.speech.output","name":"commercial license for synthesized speech output","description":"Grants explicit commercial use rights for synthesized audio output on Indie tier and above, enabling use of TTS output in commercial products, services, and monetized content without additional licensing fees or restrictions. The free tier does not include commercial rights, restricting use to personal or non-commercial projects.","intents":["Build commercial products with TTS-generated voice output","Monetize applications or content that uses synthesized speech","Distribute commercial software with embedded TTS voices","Create commercial audiobooks, podcasts, or media with AI narration"],"best_for":["Commercial software companies building TTS-powered products","Content creators monetizing AI-narrated content","Agencies building client projects with TTS","Startups planning to commercialize voice-enabled applications"],"limitations":["Commercial rights only granted on paid tiers (Indie $10/mo and above); free tier explicitly excludes commercial use","Specific commercial use restrictions not documented; unclear if there are limitations on voice cloning for commercial use","No documented restrictions on reselling or redistributing synthesized audio","No documented indemnification or liability terms for commercial use","Commercial license terms not provided in documentation; full terms require review of legal agreement"],"requires":["Indie tier subscription ($10/mo) or higher","Acceptance of commercial license terms (not documented in provided material)"],"input_types":["any text input for synthesis"],"output_types":["audio output with commercial use rights"],"categories":["automation-workflow","licensing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_6","uri":"capability://text.generation.language.free.playground.for.experimentation.without.api.integration","name":"free playground for experimentation without api integration","description":"Provides a web-based playground interface for testing TTS synthesis without requiring API key setup or code integration, enabling non-technical users and developers to evaluate voice quality, language support, and voice cloning before building applications. The playground has no documented character limit and allows full feature exploration including voice cloning from audio uploads.","intents":["Evaluate LMNT voice quality and naturalness before committing to API integration","Test voice cloning with sample audio without writing code","Explore multilingual synthesis and language switching capabilities","Demonstrate TTS capabilities to stakeholders or team members"],"best_for":["Non-technical stakeholders evaluating TTS quality","Developers prototyping voice requirements before API integration","Teams comparing LMNT with competing TTS providers","Content creators testing voice options for projects"],"limitations":["Playground output cannot be directly integrated into applications; requires API integration for production use","No documented way to export or download playground-generated audio","Playground feature set may differ from API capabilities; unclear which features are available in playground","No documented session persistence; unclear if playground work is saved between sessions","Playground is web-based only; no documented mobile or offline access"],"requires":["Web browser with JavaScript enabled","No API key or account required (free access)"],"input_types":["text input (no documented character limit)","audio files for voice cloning (format not specified)"],"output_types":["audio playback in browser","voice cloning results (downloadable status not documented)"],"categories":["text-generation-language","prototyping"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_7","uri":"capability://text.generation.language.real.time.speech.to.speech.with.livekit.integration","name":"real-time speech-to-speech with livekit integration","description":"Enables real-time speech-to-speech conversations by combining speech recognition, LLM processing, and TTS synthesis in a single integrated workflow, demonstrated through integration with LiveKit for WebRTC-based voice communication. The system captures incoming speech, processes it through an LLM, and streams synthesized response audio back in real-time, enabling natural two-way voice conversations with AI agents.","intents":["Build voice-based conversational AI agents that respond naturally in real-time","Create interactive voice applications with bidirectional audio streaming","Develop voice-enabled customer service bots with natural conversation flow","Build multiplayer games with real-time voice interaction between players and AI"],"best_for":["Teams building real-time voice AI applications","Game studios creating voice-interactive experiences","Customer service platforms requiring voice interaction","Conversational AI startups prioritizing natural interaction"],"limitations":["Speech-to-speech capability is demonstrated through LiveKit integration example; unclear if it's a native LMNT feature or requires external STT provider","No documented STT provider integration; unclear which speech recognition services are supported","LLM integration not documented; unclear which LLM providers are supported or how context is managed","End-to-end latency for speech-to-speech not documented; only TTS streaming latency (150-200ms) is specified","No documented error handling for speech recognition failures or LLM processing delays","LiveKit integration example is a demo; production integration requirements not documented"],"requires":["LMNT API key with streaming enabled","LiveKit server or cloud instance (for WebRTC infrastructure)","Speech-to-text provider (not specified; may require separate API key)","LLM provider for response generation (not specified; may require separate API key)","WebRTC-capable client (browser or native app)"],"input_types":["audio stream from user (speech input)","text from LLM (for TTS synthesis)"],"output_types":["audio stream to user (synthesized speech response)","WebRTC media stream for bidirectional communication"],"categories":["text-generation-language","tool-use-integration","real-time-communication"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_8","uri":"capability://text.generation.language.streaming.tts.for.interactive.narrative.and.game.dialogue","name":"streaming tts for interactive narrative and game dialogue","description":"Optimizes TTS synthesis for game and interactive narrative use cases by streaming audio in real-time as dialogue is generated, enabling dynamic NPC speech, branching dialogue trees, and player-responsive narration without pre-recording voice assets. The system supports rapid text-to-speech conversion for procedurally-generated or player-influenced dialogue that would be impractical to pre-record.","intents":["Generate dynamic NPC dialogue that responds to player actions in real-time","Create branching dialogue trees with unlimited voice variations without pre-recording","Build procedurally-generated narrative content with natural voice narration","Implement player-customizable character voices in games"],"best_for":["Game studios building open-world or procedurally-generated games","Interactive fiction and narrative game developers","Indie game developers without voice acting budgets","Games with extensive dialogue trees or player-influenced narratives"],"limitations":["150-200ms latency may be noticeable for rapid dialogue exchanges; unclear if acceptable for fast-paced games","No documented support for voice emotion, emphasis, or prosody control; dialogue may sound monotone","No documented support for sound effects or music integration with dialogue","Voice cloning quality for game characters not benchmarked; may require multiple takes to achieve desired character voice","No documented support for dialogue branching or conditional synthesis; each dialogue option requires separate API call","Streaming may cause audio artifacts or stuttering if network conditions are poor"],"requires":["LMNT API key with streaming enabled","Game engine with WebSocket support (Unity, Unreal, custom engine)","Audio playback system that can handle streaming audio chunks","Dialogue generation system (LLM or scripted) that produces text for synthesis"],"input_types":["dialogue text (variable length, generated dynamically)","voice identifier for character (pre-built or cloned voice)"],"output_types":["audio stream for real-time playback in game","streaming chunks for progressive audio rendering"],"categories":["text-generation-language","automation-workflow","game-development"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__cap_9","uri":"capability://text.generation.language.history.tutor.application.with.streaming.speech.synthesis","name":"history tutor application with streaming speech synthesis","description":"Demonstrates a complete LLM-powered educational application where an AI history tutor generates educational content and streams it as natural speech in real-time, hosted on Vercel for serverless deployment. The application combines LLM text generation with LMNT streaming TTS to create an interactive learning experience where students hear the tutor speak naturally while content is being generated.","intents":["Build educational AI tutors that speak naturally while generating responses","Create interactive learning applications with real-time speech synthesis","Deploy educational AI on serverless infrastructure without managing TTS servers","Demonstrate LLM + TTS integration for educational use cases"],"best_for":["EdTech companies building AI tutoring platforms","Educational content creators adding voice narration to AI-generated lessons","Developers learning how to integrate LMNT TTS with LLMs","Teams deploying educational AI on serverless platforms"],"limitations":["Example application is a demo; production-ready features (authentication, persistence, analytics) not documented","LLM provider not specified in example; unclear which LLM service is used","Vercel deployment specifics not documented; unclear if there are latency or cost implications","Student interaction model not documented; unclear how questions are submitted or context is maintained","No documented support for multi-turn conversations or session persistence","Educational content quality depends on underlying LLM; LMNT only handles speech synthesis"],"requires":["LMNT API key","LLM API key (provider not specified)","Vercel account for deployment (or equivalent serverless platform)","Frontend framework for student interface (not specified)"],"input_types":["student questions or prompts","educational content from LLM"],"output_types":["streaming speech audio of tutor responses","text transcript of tutor speech (optional)"],"categories":["text-generation-language","tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"lmnt__headline","uri":"capability://voice.audio.real.time.text.to.speech.api.for.conversational.ai","name":"real-time text-to-speech api for conversational ai","description":"LMNT is an ultra-low-latency streaming text-to-speech API designed for real-time conversational AI applications, offering natural-sounding voices with sub-200ms latency and instant voice cloning capabilities.","intents":["best real-time text-to-speech API","text-to-speech API for conversational AI","low-latency voice API for streaming","instant voice cloning service","real-time voice synthesis for chatbots"],"best_for":["real-time applications","conversational interfaces"],"limitations":[],"requires":[],"input_types":[],"output_types":[],"categories":["voice-audio"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":58,"verified":false,"data_access_risk":"high","permissions":["API key from LMNT account (free tier or paid subscription)","WebSocket client library (native browser WebSocket API or Node.js ws library)","Audio playback capability (Web Audio API, native audio player, or equivalent)","Network connectivity with low latency to LMNT infrastructure (geographic region not specified)","Audio sample in supported format (format specifications not documented)","5 seconds of clear, consistent speech from target voice","API key with voice cloning enabled (available on Indie tier and above)","Method to upload audio sample (upload mechanism not documented)","Startup status (definition not documented)","Application to LMNT startup program (process not documented)"],"failure_modes":["Streaming latency of 150-200ms is end-to-end; actual time-to-first-byte and per-character latency not specified","WebSocket streaming requires persistent connection management; no documented fallback to HTTP polling","Maximum text length per streaming request not documented; may require chunking for long utterances","Latency claims are stated but not independently verified; actual performance depends on network conditions and client implementation","Requires 5-second minimum audio sample; quality of clone depends on sample audio clarity and consistency","No documented guidance on optimal sample characteristics (background noise tolerance, speaker consistency, accent variation)","Unlimited cloning is available but no documented limits on total clones per account or storage","Voice cloning quality and naturalness not independently benchmarked; subjective 'studio quality' claim not quantified","No documented ability to edit or fine-tune cloned voices after creation","Grant program details not documented; unclear what qualifies as 'early-stage' or what benefits are included","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.7,"quality":0.9,"ecosystem":0.15000000000000002,"match_graph":0.25,"freshness":0.75,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.1,"match_graph":0.28,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:23.327Z","last_scraped_at":null,"last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=lmnt","compare_url":"https://unfragile.ai/compare?artifact=lmnt"}},"signature":"5RLWywZB5b61jkVYVLAbNW8BHyXMPn8ZG2Wy/1XMFDiM+iTNtF/iELnEmrBOvhGglFInWaDqnnzWOaEmyR/SAg==","signedAt":"2026-06-22T11:15:47.501Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/lmnt","artifact":"https://unfragile.ai/lmnt","verify":"https://unfragile.ai/api/v1/verify?slug=lmnt","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}