# Delx Commerce Speech HD — High-Quality Text-to-Speech API

> Delx Commerce Speech HD — High-Quality Text-to-Speech API is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.08/call, status unknown (last checked 2026-10-02).

Converts text into high-definition audio (WAV) using AI voice synthesis with configurable voice, emotion, pitch, speed, and language options, billed per result in USDC via x402.

## Facts

- Endpoint: POST https://commerce.delx.ai/api/v1/x402/speech-hd?utm_source=zero.xyz
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-commerce-speech-hd-high-quality-text-to-speech-api-052fa142
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zvZOgecIEK6jFunV-Ei0t

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability delx-commerce-speech-hd-high-quality-text-to-speech-api-052fa142 -d '<json body>'
```

Example prompt: Can you synthesize this paragraph into speech using the CaptivatingStoryteller English voice with a happy emotion and normal speed: 'Welcome to the future of AI-powered commerce, where every transaction is instant and verifiable.'

## When to prefer this

Choose this endpoint when you need high-definition (HD) AI voice synthesis with verifiable delivery, multilingual support (English, Spanish, Portuguese, French, German, Italian, Japanese, Korean), fine-grained emotion control, and pay-per-result USDC billing without account signup. Prefer over standard TTS APIs when audio quality, SHA256 delivery verification, and crypto-native micropayment billing are priorities.

## Known failure modes

- Text exceeds 500 UTF-8 bytes — returns validation error
- Invalid voice enum value — returns 422 unprocessable entity
- Upstream provider (Replicate/MiniMax) failure — may return 502 or retry indicated
- Insufficient USDC payment via x402 — returns 402 Payment Required
- Unsupported language/voice combination — may fall back to auto or error

## How this service works

Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.

## Output

Returns a JSON object containing a publicly accessible WAV audio file URL, audio duration in milliseconds, sample rate (32000 Hz), channel count, voice and emotion used, generation ID, SHA256 hash for verification, USDC sale price, provider details, and input token count.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 500,
   "minLength": 1,
   "description": "Text to synthesize; the UTF-8 encoding must not exceed 500 bytes.",
   "x-maxUtf8Bytes": 500
  },
  "input": {
   "type": "string",
   "maxLength": 500,
   "minLength": 1,
   "description": "Alias for text; the UTF-8 encoding must not exceed 500 bytes.",
   "x-maxUtf8Bytes": 500
  },
  "pitch": {
   "type": "integer",
   "default": 0,
   "maximum": 12,
   "minimum": -12
  },
  "speed": {
   "type": "number",
   "default": 1,
   "maximum": 2,
   "minimum": 0.5
  },
  "voice": {
   "enum": [
    "English_Wiselady",
    "English_Deep-VoicedGentleman",
    "English_CaptivatingStoryteller",
    "Portuguese_Wiselady",
    "Portuguese_Deep-VoicedGentleman",
    "Portuguese_CaptivatingStoryteller",
    "Portuguese_Narrator",
    "Spanish_Wiselady",
    "Spanish_Deep-tonedMan",
    "Spanish_CaptivatingStoryteller",
    "Spanish_Narrator"
   ],
   "type": "string",
   "default": "English_Wiselady"
  },
  "emotion": {
   "enum": [
    "auto",
    "happy",
    "sad",
    "angry",
    "fearful",
    "disgusted",
    "surprised",
    "neutral"
   ],
   "type": "string",
   "default": "auto"
  },
  "language": {
   "enum": [
    "Automatic",
    "English",
    "French",
    "German",
    "Italian",
    "Japanese",
    "Korean",
    "Portuguese",
    "Spanish"
   ],
   "type": "string",
   "default": "Automatic"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "bytes": 588252,
  "model": "minimax/speech-02-hd",
  "pitch": 0,
  "speed": 1,
  "voice": "English_CaptivatingStoryteller",
  "sha256": "7ded32df89c15e721f6e997931b3ee28d40a89635fe35d91b5a496712e95bead",
  "emotion": "happy",
  "channels": 1,
  "language": "English",
  "provider": "replicate",
  "audio_url": "https://api.delx.ai/api/v1/generated-audio-hd/7de36cd5f5f34ef8a28904b9b5985f60.wav",
  "media_type": "audio/wav",
  "duration_ms": 9172,
  "input_tokens": 130,
  "generation_id": "7de36cd5f5f34ef8a28904b9b5985f60",
  "sample_rate_hz": 32000,
  "sale_price_usdc": 0.08,
  "gross_margin_usd": 0.067,
  "provider_attempts": 1,
  "sample_width_bits": 16,
  "upstream_cost_usd": 0.013
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-commerce-speech-hd-high-quality-text-to-speech-api-052fa142/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from commerce.delx.ai](https://www.zero.xyz/host/commerce.delx.ai/llms.txt)