falText to speechComing soon

fal-ai/bytedance/seed-speech/tts/v2

Name: fal-ai/bytedance/seed-speech/tts/v2
Brand: fal

fal-ai/bytedance/seed-speech/tts/v2 is a text to speech tool from fal that runs in the background and returns audio. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Priced by usage

Pricing

$0.039 per 1,000 characters of text. The final charge comes from usage.

Limits

Runs: In the background
Returns: audio
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`text` required	text	—	The text to synthesize into speech.
`voice`	one of vivi_mixed_en_zh_ja_es_id, mindy_en_es_id_pt_zh, stokie_en, dacey_en, tim_en, kian_en_zh, cedric_en_zh, sophie_en_zh, jean_en_zh, magnus_en_zh, mabel_en_zh, nadia_en_zh, opal_en_zh, pearl_en_zh, quentin_en_zh, vienna_mixed_en_zh, alina_mixed_en_zh, corinne_mixed_en_zh, esther_mixed_en_zh, freya_mixed_en_zh, gigi_mixed_en_zh, holly_mixed_en_zh, lyla_mixed_en_zh, daisy_mixed_en_zh, tracy_es_zh, jess_ja_es_id_pt_en_zh, pinky_es_ko_mixed_en_zh, sweety_ja_es, sandy_es_mixed_en_zh, sven_de, minimi_ja, usseau_fr, felipe_es, han_id, martins_pt, enzo_it, shane_ko, bonnie_zh, felix_zh, celeste_zh, monkey_king_zh	stokie_en	Voice to use for synthesis. The preset name encodes the voice and its supported language codes. 'mixed_en_zh' means the voice can seamlessly blend English and Chinese; separate codes (e.g. 'en_zh') mean the voice supports each language independently.
`output_format`	one of mp3, opus	mp3	Output audio format. 'mp3' returns MP3 audio; 'opus' returns Opus audio in an Ogg container.
`sample_rate`	one of 8000, 16000, 22050, 24000, 32000, 44100, 48000	24000	Sample rate of the output audio in Hz.
`speed`	number 0.5 to 2	1	Speech speed. 1.0 is normal speed, 0.5 is half speed, 2.0 is double speed.
`volume`	number 0.5 to 2	1	Volume. 1.0 is normal volume, 0.5 is half, 2.0 is double.
`pitch`	number (whole) -12 to 12	0	Voice pitch shift in semitones. 0 is normal pitch, -12 lowers by one octave, 12 raises by one octave.
`language`	one of zh, en, ja, es-mx, id, pt-br, ko, it, de, fr	—	Force the text to be read as a single language, disabling automatic language detection. Leave unset for automatic detection (including seamless Chinese/English mixing on bilingual voices). Codes: zh (Chinese), en (English), ja (Japanese), es-mx (Mexican Spanish), id (Indonesian), pt-br (Brazilian Portuguese), ko (Korean), it (Italian), de (German), fr (French).
`voice_instruction`	text	—	Optional natural-language instruction that steers the delivery (tone, emotion, pace, volume), e.g. 'Speak in a cheerful tone' or 'Could you speak a bit slower?'. It is not spoken aloud and does not affect billing.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "fal-ai/bytedance/seed-speech/tts/v2",
    "input": {
      "text": "Hello, this is a test of ByteDance TTS 2.0 speech synthesis."
    }
  }'