As recorded at collection: $50 in free credits when you sign up for AssemblyAI

AssemblyAI provides features for converting speech to text or processing it in real time through an API (a way to connect features for use in other programs). The one-time $50 in free credits for new developers can be used for transcribing prerecorded audio and real-time streaming (sending audio in real time). They can also be used for speaker identification, summarization, sentiment, topic and entity detection, redaction of personal information, automatic chapters, content moderation, and Guardrails features.

If you sign up for AssemblyAI with a new account, you can use the credits immediately without adding a card. The cheapest asynchronous plan (processing that is not real time), Universal-2, can transcribe about 333 hours of audio at $0.15 per hour. Universal-3 Pro, which offers higher accuracy, can transcribe about 238 hours at $0.21 per hour.

No credit expiration date is listed separately. Once all the credits are used, the account stops working, and you need to add a card and top up the balance to use it again. You will not be charged automatically after the credits run out.