REST API · Streaming TTS

NSFW Voice / TTS API — adult voice synthesis with character & emotion

Q: How do I authenticate?

Bearer token in the Authorization header. Generate keys from your dashboard — sandbox for testing, production with rate limits and credit metering. Keys are revocable, support per-key IP allowlists, and can be scoped per-domain.

Q: Is the API really built for adult content?

Yes. Voices are trained on adult corpora with style presets (whisper, moan, ASMR, breathy, dominant, submissive) that mainstream providers filter or refuse. We don't silently mute adult content mid-stream — what you send is what gets synthesized.

Q: Do you support streaming?

Yes. Default streaming returns chunked MP3/WAV/opus over HTTP at sub-300ms TTFB p50. SSE variant provides word-level alignment timestamps for subtitle and lip-sync use cases. Batch endpoint also available for long-form scripts.

Q: What's the rate limit?

Shared-fleet default is 30 concurrent synth requests per key and 5M characters per 24h. Volume tiers lift both. Dedicated endpoints have no hard cap — limited only by your GPU(s) and configured queue depth.

Q: Can I clone a voice?

Yes, with a signed consent pack and 30s of reference audio. Clones are verified (liveness + speaker match), watermarked by default, and 2257 record helpers are exported automatically. We do not accept unverified clones and we will refuse or revoke clones with disputed consent.

Q: What formats are supported?

MP3 (default), WAV (lossless), Opus (low-bandwidth streaming) and raw PCM. Sample rates from 16kHz to 48kHz. Word-level alignment JSON available alongside audio for subtitle and lip-sync pipelines.

Q: Is the API 2257-compliant?

For voice cloning, yes — we export consent verification, watermark IDs and per-clone records. For synthesised content, the responsibility for record-keeping stays with you as the publisher, but our API provides content hashes and per-request logs designed to support audit conversations.

Q: Can I get a dedicated endpoint?

Yes. Dedicated A100/L40S clusters start at $3,500/mo with sub-200ms TTFB SLA, isolated voice cache and custom routing. Multi-region failover is available for enterprise tiers. Most customers start shared and move to dedicated when realtime SLAs become critical.

Q: How does pricing scale?

Pay-as-you-go at $0.012 / 1K characters, dropping to $0.006 / 1K on volume tiers. Long-form batch jobs receive additional discounts. Dedicated GPU is a flat monthly fee with included character allowance and overage at volume-tier pricing.

A streaming text-to-speech API built for adult content: 200+ character-matched voices with whisper, moan, breathy and ASMR styles, full SSML, emotion and pacing control, and sub-300ms time-to-first-byte. Drop-in for ElevenLabs-style requests — with voice styles the mainstream providers won't ship. Optional voice cloning with consent, verification and 2257 record helpers built in.

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200+

Adult-tuned voices

<300ms

Streaming TTFB

99.9%

Uptime SLA

$0.012

Per 1K characters

TL;DR

Endpoint: POST https://api.nsfwcoders.com/v1/tts/stream — streaming MP3/WAV/opus audio, Bearer auth, JSON body with text, voice_id, style, emotion and optional SSML.

Voices: 200+ adult-tuned voices including whisper, moan, breathy, ASMR, dominant and submissive — plus cloned voices with verified consent packs.

Pricing: $0.012 / 1K characters on pay-as-you-go; volume tiers drop to $0.006 / 1K. Dedicated GPU endpoints from $3,500/mo for sub-200ms TTFB SLA.

SLA: 99.9% uptime, sub-300ms streaming TTFB p50, multi-region failover, optional pre-fetch caching for hot voice lines.

Overview

Voice synthesis for the content mainstream TTS won't ship

ElevenLabs, OpenAI TTS, Google and Azure all refuse — or quietly mangle — adult content. Whispered dialogue turns robotic, moans get filtered into silence, ASMR pacing flattens into audiobook monotone. Our NSFW Voice / TTS API is trained specifically for adult voice: 200+ character-matched voices with style presets (whisper, moan, breathy, ASMR, dominant, submissive), per-line emotion control, and full SSML support.

The endpoint streams audio chunks at sub-300ms TTFB — first sound before the user lifts their finger off send. It powers our own companion app voice notes and white-label voice-call features, so the operational bar is real-time, not batch. For studios generating long-form audio, batch synthesis supports 30-minute scripts with consistent voice and emotion across segments.

Who uses it: companion apps adding voice notes and AI voice calls, ASMR creators scaling their voice catalog, audiobook studios producing adult fiction, cam sites generating creator voiceovers for off-peak content, and dating apps prototyping voice matches. If your audio feature sounds off when adult, the model — not your code — is the problem.

What makes it different: adult-tuned voice styles you can't get from ElevenLabs, sub-300ms streaming for real-time UX, per-request emotion and breath control, consent-first voice cloning with watermarking and 2257 records, and a provider that doesn't silently deprecate adult voices in the next release.

200+ adult-tuned voices incl. whisper, moan, ASMR, breathy, dominant, submissive

Streaming MP3/WAV/opus at <300ms TTFB

Full SSML + emotion, breath, pacing and intensity parameters

Voice cloning with consent pack, verification and watermarking

Per-conversation voice consistency (persona_id carries voice across calls)

Batch synthesis for long-form audio (audiobooks, scripts, ASMR packs)

NSFW Voice / TTS API — adult voice synthesis — engineered by NSFW Coders

60-day delivery

prototype to production

Product showcase

What your users actually see

A live-grade interface built on the same components we ship to production — designed for retention, monetization, and scale.

NSFW voice / TTS API multi-voice synthesis dashboard by NSFW Coders — Character-matched adult TTS with whisper, moan and ASMR styles — streaming at sub-300ms TTFB.

Who it's for

Who calls this API

AI companion apps

Voice notes and real-time AI voice calls with character-matched delivery.

ASMR creators & studios

Scale voice catalog without studio time; produce ASMR packs in volume.

Adult audiobook studios

Long-form fiction narration with consistent voice across 30-min+ scripts.

Cam & creator platforms

Voiceovers for creator content during off-peak hours; AI twin voice chats.

Dating apps

Voice matches, icebreaker audio, in-app voice messages that sound human.

Adult game studios

NPC voice lines with emotion control tied to in-game state and dialogue branches.

Why NSFW Coders

Why this TTS API vs mainstream

/ 01

Adult-tuned voices

Whisper, moan, ASMR, breathy styles — trained on adult corpora, not filtered at runtime.

/ 02

Realtime streaming

Sub-300ms TTFB for chat UX; no batch-only limitation like many TTS providers.

/ 03

Emotion + breath control

Per-line emotion, breath intensity, pacing and moan-onset parameters via SSML or JSON.

/ 04

Voice cloning done right

Consent packs, verification, watermarking and 2257 record helpers — clone safely, not recklessly.

/ 05

Adult-business-friendly

We don't pull your key when adult audio volume spikes; the fleet is sized for it.

/ 06

Operated, not resold

We run the GPU fleet ourselves; same TTS behind our companion apps, 3 years in production.

Authority & track record

Adult voice synthesis, operated

on the same fleet our companion apps use

200+ adult-tuned voices

Whisper, moan, ASMR, breathy, dominant, submissive and character-matched voices — none of which vanilla TTS providers ship.

Realtime streaming

Sub-300ms TTFB on streaming synthesis — first audio chunk before the user's finger lifts off the send button.

Voice cloning (consent-first)

Bring your own voice with a signed consent pack; verification, watermarking and 2257 records handled in-platform.

SSML + emotion control

Full SSML plus emotion, breath, pacing and intensity parameters — dial in the exact delivery your scene calls for.

99.9% SLA on streaming

Multi-region failover on H100/GPU audio fleet — the same TTS that powers our white-label companion voice calls.

What's included

API features what ships in the endpoint

Streaming audio

Chunked MP3/WAV/opus over HTTP with <300ms TTFB p50; SSE for word-level alignment.

200+ adult voices

Character-matched presets with style tags (whisper, moan, ASMR, breathy, dominant, submissive).

SSML + emotion params

Full SSML plus emotion, breath, pacing, intensity and pitch-per-segment control.

Voice cloning

Upload a consent pack + 30s of reference audio; clone in minutes with watermarking on by default.

Persona consistency

persona_id binds voice + style + emotion profile across calls — for multi-turn voice chats.

Batch synthesis

Submit 30-min+ scripts via async batch endpoint; consistent voice across segments.

Word-level alignment

Timestamps per word for lip-sync, subtitle generation and karaoke-style highlight.

Webhooks + retries

Batch completion, voice clone verification and credit-low events with HMAC signatures.

Credit metering

Per-character billing with prepaid balance, refund on synth errors, and per-key quotas.

Process

Integration flow — step by step

Get API key

Pick voices & styles

Browse the 200+ voice catalog; pick presets per character; request custom voice clones.

Test streaming

Stream a sample line with cURL or our Postman collection; verify TTFB and audio quality.

Integrate SDK

Use our Python or Node SDK with streaming helpers; wire persona_id for consistency.

Go live

Swap to production key; configure webhooks, rate limits and credit alerts; monitor dashboards.

Clone voices (optional)

Submit consent pack + reference audio; clone in minutes with watermarking and 2257 records.

GPU-optimised pipeline

Architecture

How the platform is wired

NSFW Coders engineers the full stack — from model serving and GPU orchestration to the application layer, payments, moderation and analytics. Every layer is built to be audited, scaled, and swapped without re-platforming.

Model layer

Stable Diffusion, Flux, Pony, custom LoRA & 3D — served via vLLM / ComfyUI / Triton.

API gateway

Key-auth, rate limits, credit metering, signed webhooks — multi-tenant.

Application layer

Next.js / React, realtime chat, in-app feed, creator studio.

Data & safety

Postgres + Redis + vector store, CSAM scanning, age gates, 2257 logs.

Discuss your architecture

200+

Adult-tuned voices

<300ms

Streaming TTFB

30M+

Characters synth'd monthly

99.9%

Uptime SLA

Tech & stack

Models & serving stack under the endpoint

Models

XTTS v2 (adult-tuned)StyleTTS 2VITS (NSFW fine-tunes)Parler TTSCustom cloned voicesEmotion control adapters

Serving

Triton Inference ServerStreaming audio chunkerRedis voice cacheKubernetes GPU autoscaleA100 + L40S fleetMulti-region failover

Stack

REST + streaming HTTPPython SDKNode.js SDKSSML supportOpenAPI 3.1 specPostman collectionWord-alignment JSON

Use cases

What teams build on it

Companion voice notes

In-chat voice messages with character-matched delivery and emotion.

Example: +38% session length vs text-only companion chat.

Realtime AI voice calls

Phone-style voice calls with AI characters in real time.

Example: Voice-call feature launched at <300ms TTFB.

ASMR catalog scaling

Produce ASMR packs in volume without studio time.

Example: Studio shipping 40 packs/month vs 4 with human VO.

Adult audiobook narration

Long-form fiction with consistent voice and emotion.

Example: 30-min chapters batch-synthed with one voice_id.

Cam-site voiceovers

Off-peak AI voice content for creator pages.

Example: +18% off-hour page revenue from voice content.

NPC voice lines

Adult game dialogue with emotion tied to scene state.

Example: Branching VN with 1,200 voiced lines per character.

Comparison

NSFW Coders TTS API vs alternatives

Feature	NSFW Coders	ElevenLabs / OpenAI TTS*	Open-source self-hosted
Adult voice styles	Whisper, moan, ASMR	Filtered or refused	DIY fine-tunes
Streaming TTFB	<300ms p50	500ms–1.5s	Depends on infra
Emotion + breath control	Per-line	Limited	DIY adapters
Voice cloning	Consent + 2257	Verification varies	DIY pipeline
Adult content allowed	By default	Often refused	N/A
Operational burden	Zero	Zero	Full-time SRE
Cost at scale	$0.012 / 1K chars	Higher	GPU capex + ops
Long-form batch synth	Async batch	Limited minutes	DIY queue
SLA	99.9% multi-region	Provider SLA	Self-managed

* Mainstream TTS providers refuse adult content or filter styles like moaning, ASMR and explicit breath control.

Monetization

Built to make money on day one

Subscription tiers, token packs, pay-per-message, pay-per-view media, creator splits, affiliate payouts and tipping — wired into adult-friendly payment processors so revenue is never blocked by a sudden account freeze.

Subscription + credits

Hybrid billing that lifts ARPU without choking free-funnel conversion.

Creator economy

Multi-creator payouts, revenue share, content locks and PPV media.

Affiliate & referrals

Tracking links, first-touch attribution, automated payouts.

High-risk payments

Segpay, CCBill, Paxum, Verotel — with fallback routing.

Voice credit metering and per-character billing dashboard

Pricing

TTS pricing, pay-as-you-go or dedicated

Pay-as-you-go

$0.012 / 1K characters

Shared GPU fleet. No monthly minimums. Volume tiers drop to $0.006 / 1K. Streaming + batch synthesis included.

200+ adult-tuned voices
Streaming + batch synth
SSML + emotion control
Voice cloning available
99.9% SLA on shared fleet

Get API access

Questions, answered

Quick answers to the questions founders ask us most about this service.