Async Text to Speech Pro V1.0

audio-tts

Generate professional-quality voiceovers in seconds with Async TTS Pro model text-based control over pauses, emphasis, and timing. Voice ids can be found at https://async.com/developer/voice-library

MODALITIES

audio

Async Text to Speech Pro V1.0 (async/tts-pro/v1.0) is a audio-tts model from Async. Pricing via AIgateway: $0.010 per 1K chars. Call it via https://api.aigateway.sh/v1/audio/speech — set model="async/tts-pro/v1.0".

model · async/tts-pro/v1.0

Use this model

model: async/tts-pro/v1.0

curl https://api.aigateway.sh/v1/audio/speech \
  -H "Authorization: Bearer $AIGATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"async/tts-pro/v1.0","voice":"alloy","input":"Hello, world."}'

curl https://api.aigateway.sh/v1/audio/speech \ -H "Authorization: Bearer $AIGATEWAY_API_KEY" \ -H "Content-Type: application/json" \ -d '{"model":"async/tts-pro/v1.0","voice":"alloy","input":"Hello world."}'

Capabilities

Pricing

Per 1K chars$0.010

You pay pass-through pricing.

See API example →Compare API reference See usage ranking →

Collections

More audio models →More from Async →Frontier models →Free-tier models →

API schema

Call Async Text to Speech Pro V1.0 from any OpenAI SDK

POST https://api.aigateway.sh/v1/audio/speech·Content-Type: application/json·Auth: Bearer sk-aig-...

Request body

json

{
  "model": "async/tts-pro/v1.0",
  "input": "Hello from AIgateway.",
  "voice": "alloy",
  "format": "mp3",        // mp3 | wav | flac | opus
  "speed": 1.0
}

Response

json

// Binary audio stream in the requested format (mp3 by default).
// Content-Type: audio/mpeg  (or audio/wav, audio/flac, audio/opus)
// Read the response body directly to a file.

Quickstart

from openai import OpenAI
client = OpenAI(base_url="https://api.aigateway.sh/v1", api_key="sk-aig-...")

r = client.audio.speech.create(model="async/tts-pro/v1.0", voice="alloy", input="Hello world.")
r.stream_to_file("out.mp3")

Errors

401authentication_errorInvalid or missing API key

402insufficient_creditsWallet empty (PAYG only)

404not_foundUnknown model or endpoint

429rate_limit_errorOver per-minute limit — see Retry-After header

500server_errorUpstream provider failed (retryable)

503service_unavailableUpstream saturated (retryable)

Full docs →API reference →OpenAPI spec →llms.txt →

Frequently asked questions

What is Async Text to Speech Pro V1.0?

Generate professional-quality voiceovers in seconds with Async TTS Pro model text-based control over pauses, emphasis, and timing. Voice ids can be found at https://async.com/developer/voice-library It is a audio-tts model from Async, accessible via AIgateway's OpenAI-compatible API at slug async/tts-pro/v1.0.

How much does Async Text to Speech Pro V1.0 cost via AIgateway?

Pass-through pricing. See the pricing panel on this page for exact rates.

How do I call Async Text to Speech Pro V1.0 from my code?

Point the OpenAI SDK at https://api.aigateway.sh/v1 with your AIgateway key and set model to "async/tts-pro/v1.0". The request and response shapes match OpenAI exactly.

Does Async Text to Speech Pro V1.0 support streaming, tool calling, vision, and JSON mode?

Streaming — no. Tool calling — no. Vision — no. JSON mode — no. Prompt caching — no.

Can I bring my own Async API key (BYOK)?

Yes. Attach a Async key in your AIgateway dashboard and this model flips to pass-through — you pay Async directly and AIgateway adds no platform fee on those calls.