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Deepgram Voice Agent API

The Deepgram Voice Agent API is an end-to-end solution that combines speech-to-text, LLM orchestration, and text-to-speech into a single real-time API. It simplifies the development of conversational voice agents by eliminating the need to stitch together multiple services. The API includes built-in barge-in detection, turn-taking prediction, function calling, and mid-session control to ensure smooth, natural conversations without pauses or interruptions.

Deepgram Voice Agent API is one of 12 APIs that Deepgram publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include Conversational AI, Real-Time, Voice Agent, and Voice AI. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

This event API exposes 2 operations across 1 channel, and defines 31 schemas. It is described by AsyncAPI 2.6.0, at version 1.0.

The API connects through a single server, wss://agent.deepgram.com/v1/agent/converse (wss).

2 operations 1 channels 31 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
1.0
Base URL
https://api.deepgram.com
Resource Areas
1

Channels & Operations 2

Across 1 channel, the API surfaces 2 operations. Each is listed below with its action, channel, parameters, and response codes.

Channels 2
SUB
/v1/agent/converse
Receive output from the voice agent
receiveAgentOutput body
PUB
/v1/agent/converse
Send input to the voice agent
sendAgentInput body

Messages & Schemas 31

The contract defines 31 schemas that model the data carried by its messages. The most detailed are SettingsPayload (4 properties), AgentStartedSpeakingPayload (4 properties), FunctionCallRequestPayload (4 properties), ConversationTextPayload (3 properties). Each schema is shown below with its type and property counts.

Settings
message
Agent session configuration
AudioInput
message
User audio data
UpdateInstructions
message
Update agent instructions mid-session
UpdateSpeak
message
Update TTS settings mid-session
InjectAgentMessage
message
Inject a message into the agent conversation
FunctionCallResponse
message
Response to a function call request
AgentKeepAlive
message
Keep the agent connection alive
AgentAudioData
message
Agent speech audio
UserStartedSpeaking
message
User speech activity detected
AgentStartedSpeaking
message
Agent has begun speaking
AgentThinking
message
Agent is processing a response
ConversationText
message
Transcript of conversation
FunctionCallRequest
message
Agent requests a function call
FunctionCalling
message
Agent is invoking a function
Welcome
message
Connection established
AgentError
message
Agent error event
SettingsPayload
object
4 properties 1 required
FunctionDefinition
object
3 properties
UpdateInstructionsPayload
object
2 properties 2 required
UpdateSpeakPayload
object
2 properties 1 required
InjectAgentMessagePayload
object
2 properties 2 required
FunctionCallResponsePayload
object
3 properties 3 required
KeepAlivePayload
object
1 property 1 required
UserStartedSpeakingPayload
object
1 property
AgentStartedSpeakingPayload
object
4 properties
AgentThinkingPayload
object
1 property
ConversationTextPayload
object
3 properties
FunctionCallRequestPayload
object
4 properties
FunctionCallingPayload
object
1 property
WelcomePayload
object
2 properties
AgentErrorPayload
object
3 properties

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

deepgram-voice-agent-asyncapi.yml Raw ↑

Other APIs Deepgram publishes across the network.

Deepgram Balances API
Deepgram Invitations API
Deepgram Keys API
Deepgram Members API
Deepgram Models API
Deepgram Pre-Recorded API
Deepgram Projects API
Deepgram Scopes API
Deepgram Text Intelligence API
Deepgram Text-To-Speech API
Deepgram Usage API
Where this information came from

This is an independent, third-party profile of Deepgram Voice Agent API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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