Freemium
AssemblyAI
AssemblyAI provides a powerful AI-driven speech-to-text API that enables developers to convert audio and video files into accurate text transcripts. The API supports real-time and batch processing, with features like topic detection, sentiment analysis, and content moderation. With API Key authentication and scalable rate limits, AssemblyAI’s freemium API is ideal for applications in industries such as media, healthcare, and customer service worldwide.
1
Endpoints
0
Views
Jul 20, 2025
Last Checked
3 hours audio/month
Rate Limit
API Endpoints
Transcribes audio files to text with speaker diarization
Full URL
https://api.assemblyai.com/v2/transcriptCode Examples
curl -X POST 'https://api.assemblyai.com/v2/transcript' \
-H 'Authorization: Bearer YOUR_API_KEY'Parameters
{
"audio_url": "https://example.com/audio.mp3",
"speaker_labels": true
}Example Response
{
"id": "abc123",
"text": "Hello world this is a test",
"words": [
{
"end": 0.8,
"word": "Hello",
"start": 0.5,
"speaker": "A"
}
],
"status": "completed"
}Version
v2
Rate Limit
300 minutes/month
Tags
audiospeech-recognition
Technical Details
Authentication
API KeyResponse Formats
JSONAvailability
globalStatus
Published Rate Limits
3 hours audio/month (free)
Supported Languages
PythonJavaScript
Use Cases
transcription
voice-analysis
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