What's free
2,000 credits/month covering ~25K characters of MARS TTS, 125 min of STT, plus limited watermarked dubbing and translation (incl. 5 OCR pages)
Rate limits
500 chars/generation TTS, 15 min/generation STT; 2,000 credits/month
The catch
Uses its own MARS8 voice models (not OpenAI-compatible). Dubbing output on the free tier is watermarked. Card and commercial terms not stated on the pricing page.
Quickstart
First-party API — not OpenAI-compatible, so there is no drop-in base URL. The exact endpoint is in the official docs; authenticate with your API key in the Authorization: Bearer header.
curl -H "Authorization: Bearer $API_KEY" \
https://<api-base-url>/<endpoint>…or in Python:
import os, requests
r = requests.post(
"https:///",
headers={"Authorization": f"Bearer {os.environ['API_KEY']}"},
json={},
)
print(r.json()) Appears in
Change history
How this free tier has changed since we started tracking it (2026-07-31) — generated from the git history of providers.json.
- 2026-07-31 Added to the hub