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Delx Kokoro Speech
x402
Delx Kokoro Speech is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Converts text to speech audio using the Kokoro TTS model, returning a durable audio URL and SHA-256 receipt, paid per-clip via x402 micropayment at $0.001 USDC.
Price / call$0.002
Success—
StatusUnknown
How this service works
Delx Commerce text to speech API for agents at $0.002 USDC. Call when you need short narration, voiceover, IVR prompts, or notification clips without a TTS subscription. Kokoro WAV + SHA-256 via x402 on Base. Accepts native `text` or OpenAI-shaped `input`/`voice`/`speed` (up to 500 characters). Not a phone carrier or realtime voice session.
Output
Returns a durable audio URL pointing to the synthesized speech clip, a SHA-256 receipt confirming payment and content integrity, and metadata about the voice and parameters used. The audio URL is persistent and can be linked or embedded directly.
Example use cases
Podcast intro narration
“Can you turn this intro script into a spoken audio clip using the bm_george voice at 1x speed? The text is: 'Hello and welcome to Tech Talks, the show where we explore the future of artificial intelligence.'”
Accessibility audio for web content
“I need an audio version of this paragraph for screen-reader users — use the bf_emma voice at 0.9 speed: 'Our return policy allows you to send back any item within 30 days of purchase for a full refund.'”
Multilingual voice preview selection
“Generate a speech sample using the ff_siwis voice at 1.2 speed so I can preview how it sounds — use this sentence: 'Bonjour, bienvenue sur notre service de synthèse vocale.'”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/speechWhen to prefer
Choose this endpoint when you need ultra-low-cost per-clip TTS ($0.001 USDC) without an API key or subscription, especially for AI agent workflows that call TTS sporadically. It is ideal when you need a durable audio URL and a verifiable SHA-256 receipt for auditability. Prefer it over subscription TTS services when usage is low-volume or unpredictable. Use when Kokoro voice quality meets your needs and you want x402 micropayment integration.
Side effects
- Text exceeds 500-character limit — request rejected with validation error
- Payment via x402 fails or USDC balance insufficient — returns 402 Payment Required
- Invalid voice enum value — returns schema validation error
- Speed value outside 0.5–2.0 range — rejected with parameter error
- Empty or missing text field — returns 400 Bad Request
- Network timeout during synthesis — may return 503 or timeout error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | Text to synthesize into a short speech clip. |
| input | string | OpenAI-compatible alias for `text`. |
| model | string | `tts-1` is accepted as a compatibility alias; delivery uses Kokoro 82M. |
| speed | number | |
| voice | string | |
| response_format | string | The hosted result is currently delivered as WAV. |
Output
Schema · Response
{
"type": "json",
"example": {
"bytes": 48128,
"model": "jaaari/kokoro-82m",
"speed": 1,
"voice": "af_bella",
"sha256": "cb45a6e6fa30b28b791a6256f9f522f13fc9c6de5b407030bd853cab62523d63",
"channels": 1,
"provider": "replicate",
"audio_url": "https://api.delx.ai/api/v1/generated-audio/0de6f22023df47f4a96c260bd980257a.wav",
"media_type": "audio/wav",
"duration_ms": 1000,
"generation_id": "0de6f22023df47f4a96c260bd980257a",
"sample_rate_hz": 24000,
"sale_price_usdc": 0.002,
"provider_attempts": 1,
"sample_width_bits": 16,
"prompt_policy_version": "raw/v1"
}
}Tags
x402
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