ElevenLabs Voice
The most realistic AI voice, priced per call and quoted before it runs.
Give your agent a voice. ElevenLabs text-to-speech and sound effects through one endpoint — Flash v2.5 for real-time conversation, Multilingual v2 / Eleven v3 for studio-grade narration. Price is quoted up front, you pay only after the audio is generated, and there's no subscription to manage.
Send text to /v1/audio/speech; the server returns a 402 with the exact price (characters × model rate). Sign the payment, replay the request, and get back a hosted audio URL. Flash starts at $0.0535/1k chars, minimum $0.002 per request (a $0.001 floor plus the $0.001 per-request fee).
What Agents Use It For
Anywhere your agent needs to speak — voice assistants, narration, IVR, accessibility, game and video audio — without standing up a TTS pipeline or committing to a monthly plan.
Models & Pricing
Text-to-speech is billed per input character (quoted before you pay). Sound effects are flat per generation. Prices below are what you pay for 1,000 characters or one clip — the model rate, the 5% platform fee and the $0.001 per-request fee included — with a $0.002 per-request minimum.
| Model | Price | Max input | Best for |
|---|---|---|---|
| elevenlabs/flash-v2.5 | $0.0535 / 1k chars | 40,000 | Ultra-low-latency (~75ms) speech synthesis for real-time voice agents. 32 languages. |
| elevenlabs/turbo-v2.5 | $0.0535 / 1k chars | 40,000 | Balanced quality and latency (~250ms) for interactive use cases. 32 languages. |
| elevenlabs/multilingual-v2 | $0.106 / 1k chars | 10,000 | Highest-consistency voice for long-form narration, audiobooks, and voiceover. 29 languages. |
| elevenlabs/v3 | $0.106 / 1k chars | 5,000 | Maximum expressiveness and emotional range for creative applications. 70+ languages. |
| bytedance/seed-audio-1.0 | $0.316 / 1k chars | 3,000 | ByteDance's Seed Audio 1.0 — prompt-directed audio creation: describe the voice, emotion, and sound staging in natural language. Up to 120s output, mp3/wav. Billed by audio duration ($0.003/second, estimated from input length). |
| elevenlabs/sound-effects | $0.0535 / clip | 22s | Generate cinematic sound effects and audio textures from a text prompt (up to 22s). |
Quick Start
Pick a voice (free)
curl https://blockrun.ai/api/v1/audio/voices
# -> { "data": [ { "voice_id": "EXAVITQu4vr4xnSDxMaL", "alias": "sarah", ... }, ... ] }Synthesize speech (pay per call)
Send unpaid to get a 402 with the exact price, then replay with the signed x-payment header.
curl -X POST https://blockrun.ai/api/v1/audio/speech \
-H "Content-Type: application/json" \
-d '{
"model": "elevenlabs/flash-v2.5",
"input": "Hello from BlockRun. Pay per call, no subscription.",
"voice": "sarah",
"response_format": "mp3"
}'
# Response (after settlement):
# {
# "model": "elevenlabs/flash-v2.5",
# "data": [{ "url": "https://blockrun.ai/api/media/media/audios/...mp3",
# "format": "mp3", "characters": 51 }]
# }Use From Your Tooling
Install once, then ask: "use blockrun to speak this with the sarah voice."
claude mcp add blockrun -s user -- \
npx -y @blockrun/mcp@latestWallet loaded from ~/.blockrun/.session. SDK handles 402 + signing.
pip install blockrun-llm
# or
npm install @blockrun/llmBehind the Scenes
Powers the voice synthesis and sound generation. BlockRun holds the ElevenLabs API key server-side and covers the upstream cost — you pay per call in USDC, with no subscription.
elevenlabs.ioGet Started
All you need is a USDC-funded wallet on Base. Hit any endpoint, get a 402, attach payment, get the audio.
ElevenLabs API questions: voices, languages, pricing, sound effects
- Which ElevenLabs models are available?
- The models on this page's rate card: the flash tier for low-latency conversation, the multilingual and v3 tiers for expressive long-form narration, and the sound-effects model on its own endpoint.
- What languages do the ElevenLabs voices speak?
- The multilingual models cover dozens of languages; the voices endpoint lists which voices speak which, and the model's row links to the full list.
- What is the latency of ElevenLabs Flash through BlockRun?
- Flash is the real-time tier and the fastest on the card; the figure on this page is what it measures. The other tiers trade latency for expressiveness.
- Can I generate sound effects with the ElevenLabs API here?
- Yes — a text description on the sound-effects endpoint returns a short clip, priced per clip, on the same payment flow.
- Can I clone a voice through this endpoint?
- No. Voice cloning is an ElevenLabs console feature; this endpoint synthesises speech from the voices the models already offer.
- ElevenLabs through BlockRun vs ElevenLabs direct, OpenAI TTS or Google speech?
- Direct is the same voices behind an ElevenLabs subscription and account; OpenAI and Google sell their own voices behind theirs. Here the same ElevenLabs models are paid per request with no account, beside other vendors' voices on one endpoint.
- How do I use the ElevenLabs API without an ElevenLabs subscription?
- Call BlockRun's speech endpoint. It carries ElevenLabs' voice models — Flash for real-time, Multilingual and Eleven v3 for studio narration — priced per thousand characters and paid per request, with no ElevenLabs account, seat or monthly allowance.
- How much does ElevenLabs text-to-speech cost per call?
- The per-thousand-character rate on each model's row, times the characters you send, plus the flat per-call fee — quoted in the 402 before the audio is synthesised.
- Can an AI voice agent call ElevenLabs without a human account?
- Yes. Each request pays for itself, so a voice agent with a funded balance speaks with no signup and nothing to cancel.