API · /tts-api

Text-to-Speech API

healthy 4,661 Subscribers

Convert text into natural-sounding speech audio (WAV) in 30+ languages and voices, with adjustable speaking speed, pitch and amplitude. Returns raw audio/wav or base64-encoded JSON — ideal for voice notifications, accessibility, IVR prompts and audio content generation. Fully self-hosted, no third-party voice service.

api.oanor.com/tts-api
Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/tts-api/openapi.json
/api/tts-api/llms.txt

Discovery: GET /api/index.json lists every API.

Text-to-Speech API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
112 ms
Server probes · 24h
Subscribers
4,661
active
Total calls
38
last 7 days
status Full status page → · 4 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,000 calls / month
  • 1 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,000 calls/month
  • 1 req/sec
  • All 30+ voices
  • No credit card
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Starter

€5.00 /month

  • 30,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 30k calls/month
  • 5 req/sec
  • WAV + base64 output
  • Email support
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Pro

€19.00 /month

  • 200,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 200k calls/month
  • 20 req/sec
  • Speed/pitch control
  • Priority support
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Enterprise

€99.00 /month

  • 2,000,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 2M calls/month
  • 50 req/sec
  • Bulk audio generation
  • Dedicated SLA
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Built by

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api.oanor.com/helmholtz-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Text-to-Speech API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Text-to-Speech API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Text-to-Speech API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Text-to-Speech API cost?
Text-to-Speech API has a free tier with 100 calls / month. Paid plans start at €5.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Text-to-Speech API GDPR-compliant?
All requests to Text-to-Speech API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/tts-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/tts-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/tts-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/tts-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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