Transcribe audio

AssemblyAI

Speech-to-text API that transcribes recorded and live audio into text with word timestamps, speaker labels and analysis options.

Methods

Method	Used for	How
API key	REST API and streaming WebSocket	`authorization` header with the raw key, no `Bearer` prefix
API key as Bearer token	MCP server	`Authorization: Bearer <key>`; the prefix is required
Account sign-in (OAuth)	MCP server	Client opens the AssemblyAI sign-in and consent page
Temporary token	Streaming from browsers or mobile	`POST https://token.assemblyai.com/v1/token`, expires in 1 to 600 seconds

Source10Transcribe an audio file

Getting access

Who creates the account: A person signs in to the AssemblyAI dashboard; the docs do not say whether an agent can sign up alone6
Where to get a key: The dashboard, API keys page6
Other requirements: A credit card once the free credits are used up5

Read from AssemblyAI’s own pages on 2026-11-04. Every number links to the page a value came from. For agents, the same facts as markdown: /tools/transcribe-audio/assemblyai.md